Wyoming Geographic Information Science Center 20020328 Unknown 1 vector digital data University of Wyoming, Laramie Wyoming Geographic Information Science Center www.wygisc.uwyo.edu/clearinghouse/watershed.html WY_HUC4 This data set is a complete digital hydrologic unit boundary layer to the Subwatershed (12-digit) 6th level for the State of Wyoming.This data set consists of geo-referenced digital data and associated attributes created in accordance with the "Federal Standards For Delineation of Hydrologic Unit Boundaries 12/06/01" (http://www.ftw.nrcs.usda.gov/huc_data.html). The data set was developed by digitizing watershed boundary lines using 1:24,000 Enhanced Digital Raster Graphics (DRG-E) geo-referenced topographic image base maps and 1:100,000-scale draft boundary lines. The National Elevation Dataset (NED) was used to produce the 1:100,000-scale preliminary draft boundaries. Polygons are attributed with hydrologic unit codes for 4th level sub-basins, 5th level watersheds, 6th level subwatersheds, name, size, downsteam hydrologic unit, type of watershed, non-contributing areas and flow modification. Arcs are attributed with the highest hydrologic unit code for each watershed, linesource and a metadata reference file. Two separate shapefiles were created for downloading purposes. One with arcs (wy_hu12arc.shp) and one with polygons (wy_hu12poly.shp). The same metadata is used for both shapefiles. Only the arc attributes will be found in the wy_hu12arc shapefile. Similarly, only the poly attributes will be found in the wy_hu12poly shapefile. The Watershed and Subwatershed hydrologic unit boundaries provide a uniquely identified and uniform method of subdividing large drainage areas. The smaller sized 6th level sub-watersheds (up to 250,000 acres) are useful for numerous application programs supported by a variety of local, State, and Federal Agencies. This data set is intended to be used as a tool for water-resource management and planning activities, particularly for site-specific and localized studies requiring a level of detail provided by large-scale map information. The dataset will be appended to a larger seamless nationally consistant geospatial database as other states complete their portion of the watershed boundary dataset. Two separate shapefiles were created for downloading purposes. One with arcs (wy_hu12arc.shp) and one with polygons (wy_hu12poly.shp). The same metadata is used for both shapefiles. Only the arc attributes will be found in the wy_hu12arc shapefile. Similarly, only the poly attributes will be found in the wy_hu12poly shapefile. en 199910200203 ground condition Complete Unknown -111.055710 -104.051903 45.006763 40.994553 -111.055710-104.05190340.99455345.006763 None HUC Hydrologic Units Watershed Boundaries Subwatershed Boundaries WBDHUB WY MT ND SD NE CO UT ID None None The distributor shall not be held liable for improper or incorrect use of this data, based on the description of appropriate/inappropriate uses described in this metadata document. It is strongly recommended that this data is directly acquired from the distributor and not indirectly through other sources which may have changed the data in some way. These data should not be used at scales greater than 1:24,000 for the purpose of identifying hydrographic watershed boundary feature locations in Wyoming. WyGISC (Wyoming Geographic Information Science Center) makes no claims for the data's suitability for other purposes. WyGISC should be acknowledged as the data source in products derived from these data. The Wyominig Watershed Boundary Dataset is public information and may be interpreted by all organizations, agencies, units of government, or others based on needs; however, they are responsible for the appropriate application of the data. Federal, State, or local regulatory bodies are not to reassign to the WyGISC or the Natural Resources Conservation Service any authority for the decisions they make. The Natural Resources Conservation Service will not perform any evaluations of these maps or purposes related solely to State or local regulatory programs. Photographic or digital enlargement of these maps to scales greater than that at which they were originally delineated can result in misrepresentation of the data. If enlarged, the maps will not include the fine detail that would be appropriate for mapping at the small scale. Digital data files are periodically updated. Files are dated, and users are responsible for obtaining the latest version of the data from the source distributor. Wyoming Geographic Information Science Center Wendy Berelson Assistant Research Scientist (307) 766-2735 (307) 766-2744 berelson@uwyo.edu 9:00-5:00 Please email questions and requests.

P.O. Box 4008

mailing addressLaramieWY82071-4008 Funding for the Wyoming Watershed Boundary Datasete (WBD) was provided by the Wyoming Department of Environmental Quality (DEQ) and the US Bureau of Land Management (BLM). Representatives from the DEQ, BLM, National Resource Conservation Service (NRCS), and the US Geological Survey (USGS) contributed a substantial amount of time and salary towards quality review of the dataset. Additionally, completion of the WBD has involved an extensive collaborative effort between WyGISC and numerous representatives from the DEQ, BLM and individual Field Offices, NRCS and individual Conservation Districts, US Forest Service and individual Forests, the Wyoming State Engineer's Office and individual Water Divisions, the Wind River Indian Reservation Tribal Council, and adjacant state agencies. Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.3.1.1850 Wyoming Geographic Information Science Center 2002 Unknown 1 vector digital data University of Wyoming, Laramie Wyoming Geographic Information Science Center http://www.wygisc.uwyo.edu/clearinghouse/ Shapefilen/aUnclassifiedn/a The accuracy of this data is dependent on the level of detail of the source material and the interprtation procedures for capturing that source. The primary limiting factor for the level of detail of the source is the scale (1:24,000) of the enhanced digital raster graphic (DRG-E). The map scale determines the level of content that may be extracted from the given source during digitization. It should be noted that no 1:24,000-scale linework was available for the Black Buttes DRG-E (USGS Quad Id # 41008-E5). Boundary locations were determined using the 1:100,000-scale DRG-E and the digital orthophoto quads. The following huc_12s intersect the black buttes quad: 140401050203, 140401050205, 140401050206, 140401050207. 1) 100% of the boundary locations were visually verified using the draft 1:100,000-scale boundaries and the enhanced digital raster graphics (DRG-E) as a reference. Additionally, 10% of the boundary locations were reviewed by the Interagency Hydrologic Unit Group (IHUG). Ocassionally (<5%) local knowledge was used to verify boundary locations or digital orthophoto quads of the area were reviewed. 2) 100% of the huc_12, huc_10 and huc_8 values were verified visually for accuracy upon attribute transfer from the 1:100,000-scale draft data and then again once the entire coverage was complete. The huc_12 values were also checked to ensure no duplicate numbers were found 3) 100% of the state attribute was visually checked. 4) The ncontrb_a areas were first identified during the creation of the 1:100,000-scale data. Areas larger than 3000-acres were attributed as noncontributing hydorlogic units. 100% of the noncontributing area were verified using the DRG-Es during the naming process. 5)The hu_10_ds and hu_12_ds were visually verified using the national hydrographic dataset and where necessary, the DRG-E. 6) The huc_10_name and hu_12_name attributes were checked for duplicates and to ensure that the names comply with the Federal Standards for the Delineation of Hydrologic Unit Boundaries. 7) The hu_10_mod and hu_12_mod attributes were visually verified for accuracy of interbasin transfers during the semi-automated attribution process. Dam locations were identified by looking at the NHD waterbodies in each huc_8 and comparing the pour point locations of the huc_8 boundaries. 8) 100% of the hu_10_type and hu_12_type attributes were visually verified. There are no unclosed polygons, intersections without nodes, or polygons without labels or with more than one label. Arc/Info's topological checking program CLEAN was used to correct intersections without nodes, identify unclosed polygons and remove duplicate lines with the same beginning and ending nodes. All sliver polygons were removed either using eliminate, merge or manually in ArcEdit. All fields for all polygons in the .pat are attributed. Some polygons in the Ncontrb_a field might have a 0 value. All fields for the lines in the .aat are attributed. The lines adjacent to the universal polygon are attributed with a 0 for the hu_level. These cannot be attributed until the adjacent states complete their linework at which point the hightest level of hydrologic unit can be determined. It should be noted that no 1:24,000-scale linework was available for the Black Buttes DRG-E (USGS Quad Id #41008-E6). Boundary locations were determined using the 1:100,000-scale DRG-E and the digital orthophoto quads. The following huc_12s intersect the Black Buttes quad: 140401050203, 140401050205, 140401050206, 140401050207. The WBD was produced using Enhanced Digital Raster Graphics (DRG-Es) digital images as source map. Data completeness for DRG files reflect content of the source graphic and may therefore be reflected in the completeness and accuracy of the WBD. The map was digitized from USGS 1:24,000-scale digital raster graphic base maps, with an inherited error of +/- 40 feet according to USGS National Map Accuracy Standards. Digitized line locations were held to the +/- 40 foot accuracy standards by ensuring that all lines were within a 12 meter buffer of where visual interpretion put the actual boundary. Any lines outside the buffer were corrected. It is estimated that the errors detected were less than 10%. It should be noted that while general rules of hydrology were used (i.e. water flows downhill), the location of boundaries is still somewhat subjective as the 1:24,000-scale DRG-E do not always provide enough information for identifying the location of the boundaries. In these instances group consensus was used. Please refer to the methods section for more details on watershed delineation rules. Unquantifiable errors may be associated with coordinate shift (fuzzy tolerance was set to 0.000000001 meters, double precision), dangle (set to 15 meters). The default was used for all other ArcEdit tolerances. It should be noted that the data was digitzed using NAD27 horizontal datum as that is the native datum of the digital raster geographics. The data was then projected to NAD83 horizontal datum as requested by the NRCS. If the Wyoming data is reprojected to nad83 and overlaid on the DRG-Es with the NAD83 DRG-Es it can be assumed that the boundaries will be off by less than 2 meters. As with the original DRGs, DRG-E is cast in the Universal Transverse Mercator projection and is referenced to the NAD27 datum. When the drg-es are used in the NAD83 datum the alternate world files only approximate the NAD83 by shifting the coordinates of the imagery. The total error introduced using this shift is less than 2 meters for all DRG-E imagery. N/A raster digital data Beartooth Mapping, Red Lodge MT199903011www.beartoothmaps.com 24 CD-ROM ground condition variable DRG-E The DRG-Es are the digital representation of the USGS 7.5min quadrangles. They were used as a backdrop to do on-screen digitizing of the watershed boundaries at 1:24k scale Vector G-polygon 14 Label point 2687 GT-polygon composed of chains 2687 Point 4 Label point 0 Composite object 101 Composite object 647 SimplePolygonFALSE14TRUEFALSESimpleLabelFALSE2687FALSEFALSESimplePolygonTRUE2687FALSEFALSESimpleTicFALSE4FALSEFALSEAnnotationFALSE0FALSEFALSEAnnotationFALSE0FALSEFALSE North American Datum of 1983 Geodetic Reference System 80 6378137.000000 298.257222 GCS_North_American_1983Decimal degrees0.0000000.000000 WY_HUC4 Feature Class14identifies watershed boundariesn/a FIDFIDOID400Internal feature number.ESRISequential unique whole numbers that are automatically generated. Shape Feature geometry. ESRI Coordinates defining the features. ShapeGeometry000 HU_2_NAME8080StringHU_2_NAMEHU_4_NAME8080StringHU_4_NAMEShape_AreaShape_AreaFloat19Area of feature in internal units squared.ESRIPositive real numbers that are automatically generated.Shape_LengShape_LengFloat19HUC_4HUC_4Number9 wy_hu12.pat Feature Class2687polygons identify watershed boundariesn/a FID Internal feature number. ESRI Sequential unique whole numbers that are automatically generated. FIDOID400 Shape Feature geometry. ESRI Coordinates defining the features. ShapeGeometry000 AREA Area of feature in internal units squared. ESRI Positive real numbers that are automatically generated. 8018String PERIMETER Perimeter of feature in internal units. ESRI Positive real numbers that are automatically generated. 8018String WY_HU12# Internal feature number. ESRI Sequential unique whole numbers that are automatically generated. 195Float11 WY_HU12-ID User-defined feature number. ESRI 195FloatSequential unique whole numbers that are automatically generated.11 HUC_8 A unique 8-digit code from the USGS map series "Hydrologic Unit Maps". The same number should be used in every record that pertains to a subwatershed that resides within the same 8-digit sub-basin. Federal Standards for Delineation of Hydrologic Unit Boundaries 98NumberFederal Standards for the Delineation of Hydrologic Unit BoundariesPlease refer to the Entity and Attribute Overview for valid valuesPositive real numbers that are automatically generated. HUC_10 This field provides a unique 10-digit code for each watershed. Add two digits to the end of the existing 8-digit code, therefore resulting in a 10-digit number. This same number should be used in every record that pertains to a subwatershed that resides within the same 10-digit watershed. Federal Standards for Delineation of Hydrologic Unit Boundaries 1010CharacterFederal Standards for the Delineation of Hydrologic Unit BoundariesPlease refer to the Entity and Attribute Overview for valid valuesSequential unique whole numbers that are automatically generated. HUC_12 This field provides a unique 12-digit code for each subwatershed. Add two digits to the end of the existing 10-digit code, therefore creating a 12-digit number. Federal Standards for Delineation of Hydrologic Unit Boundaries 1212CharacterFederal Standards for the Delineation of Hydrologic Unit BoundariesPlease refer to the Entity and Attribute Overview for valid values ACRES Area of subwatershed including non-contributing areas calculated to acres as a whole number, no decimals. Data was projected to Albers Equal Area to calculate the acres field. Acres were calculated by dividing area by 4046.86 (This equation was provide by the NRCS-NCGC). Federal Standards for Delineation of Hydrologic Unit Boundaries 812Float0Federal Standards for the Delineation of Hydrologic Unit BoundariesPlease refer to the Entity and Attribute Overview for valid values STATES The "States" field needs to include the names of all state(s) that the subwatershed falls within. Federal Standards for Delineation of Hydrologic Unit Boundaries 1111CharacterFederal Standards for the Delineation of Hydrologic Unit BoundariesPlease refer to the Entity and Attribute Overview for valid values NCONTRB_A Drainage areas that do not flow toward the outlet of any hydrologic unit are considered non-contributing. Only isolated non-contributing areas larger than 3,000 acres were delineated and their acreage noted in this field Federal Standards for Delineation of Hydrologic Unit Boundaries 812Float0Federal Standards for the Delineation of Hydrologic Unit BoundariesPlease refer to the Entity and Attribute Overview for valid values HU_10_DS The 10-digit code of the 5th level hydrologic unit that is receiving the majority of the flow from the watershed that the 6th level HU falls within. Outlets created by ditching or other artificial drainage are not to be considered for this field. Federal Standards for Delineation of Hydrologic Unit Boundaries 1010CharacterFederal Standards for the Delineation of Hydrologic Unit BoundariesPlease refer to the Entity and Attribute Overview for valid values HU_10_NAME A unique name for each 5th level hydrologic unit that relates to the major water feature within the polygon or the major water body it contributes to Federal Standards for Delineation of Hydrologic Unit Boundaries 8080CharacterFederal Standards for the Delineation of Hydrologic Unit BoundariesPlease refer to the Entity and Attribute Overview for valid values HU_10_MOD This field identifies interbasin transfers (IT) and dams at outlet (DM) that modify natural overland flow as Modifications are identified from most significant to least significant modification(s) and are based on a query of hydrologic units using the 1:100,000-scale National Hydrography Dataset. Hydrologic units with no modification are marked with NM. Modification by Wyoming Geographic Information Science to the Federal Standards for Delineation of Hydrologic Unit Boundaries 2020CharacterFederal Standards for the Delineation of Hydrologic Unit BoundariesPlease refer to the Entity and Attribute Overview for valid values HU_10_TYPE This field identifies the type of watershed. Federal Standards for Delineation of Hydrologic Unit Boundaries 11CharacterFederal Standards for the Delineation of Hydrologic Unit BoundariesPlease refer to the Entity and Attribute Overview for valid values HU_12_DS The 12-digit code of the 5th level hydrologic unit that is receiving the majority of the flow from the watershed that the 6th level HU falls within. Outlets created by ditching or other artificial drainage are not to be considered for this field. Federal Standards for Delineation of Hydrologic Unit Boundaries 1212CharacterFederal Standards for the Delineation of Hydrologic Unit BoundariesPlease refer to the Entity and Attribute Overview for valid values HU_12_NAME A unique name for each 6th level hydrologic unit that relates to the major water feature within the polygon or the major water body it contributes to Federal Standards for Delineation of Hydrologic Unit Boundaries 8080CharacterFederal Standards for the Delineation of Hydrologic Unit BoundariesPlease refer to the Entity and Attribute Overview for valid values HU_12_MOD This field identifies interbasin transfers (IT) and dams at outlet (DM) that modify natural overland flow as Modifications are identified from most significant to least significant modification(s) and are based on a query of hydrologic units using the 1:100,000-scale National Hydrography Dataset. Hydrologic units with no modification are marked with NM. Federal Standards for Delineation of Hydrologic Unit Boundaries 2020CharacterFederal Standards for the Delineation of Hydrologic Unit BoundariesPlease refer to the Entity and Attribute Overview for valid values HU_12_TYPE This field identifies the type of watershed. Federal Standards for Delineation of Hydrologic Unit Boundaries 11CharacterFederal Standards for the Delineation of Hydrologic Unit BoundariesPlease refer to the Entity and Attribute Overview for valid values HU_2_NAME A unique name for each 1st level hydrologic unit that relates to the major water feature within the polygon or the major water body it contributes to Federal Standards for Delineation of Hydrologic Unit Boundaries 8080CharacterFederal Standards for the Delineation of Hydrologic Unit BoundariesPlease refer to the Entity and Attribute Overview for valid values HU_4_NAME A unique name for each 2nd level hydrologic unit that relates to the major water feature within the polygon or the major water body it contributes to Federal Standards for Delineation of Hydrologic Unit Boundaries 8080CharacterFederal Standards for the Delineation of Hydrologic Unit BoundariesPlease refer to the Entity and Attribute Overview for valid values HU_6_NAME A unique name for each 3rd level hydrologic unit that relates to the major water feature within the polygon or the major water body it contributes to Federal Standards for Delineation of Hydrologic Unit Boundaries 8080CharacterFederal Standards for the Delineation of Hydrologic Unit BoundariesPlease refer to the Entity and Attribute Overview for valid values HU_8_NAME A unique name for each 4th level hydrologic unit that relates to the major water feature within the polygon or the major water body it contributes to Federal Standards for Delineation of Hydrologic Unit Boundaries 8080CharacterFederal Standards for the Delineation of Hydrologic Unit BoundariesPlease refer to the Entity and Attribute Overview for valid values Description of attributes by field from the Federal Standards for Delineation of Hydrologic Unit Boundaries 1) .pat attributes Huc_8 : Eight Digit Hydrologic Unit Code - (REQUIRED) A unique 8-digit code from the USGS map series "Hydrologic Unit Maps". Use the existing code for the sub-basin where the subwatershed resides; do not change this code. The same number should be used in every record that pertains to a subwatershed that resides within the same 8-digit sub-basin.Numbers were assigned in an upstream to downstream fashion. Where no downstream/upstream relationship could be determined numbers were assigned in a clockwise fashion. Huc_10: Ten Digit Hydrologic Unit Code - (REQUIRED) This field provides a unique 10-digit code for each watershed. Add two digits to the end of the existing 8-digit code, therefore resulting in a 10-digit number. This same number should be used in every record that pertains to a subwatershed that resides within the same 10-digit watershed.Numbers were assigned in an upstream to downstream fashion. Where no downstream/upstream relationship could be determined numbers were assigned in a clockwise fashion. It should be noted that the polygons that cross into Idaho were numbered by Idaho and are not consistent with the above methods. Affected huc_8s include: 17040202, 17040204 and 17040104. Huc_12: Twelve Digit Hydrologic Unit Code - (REQUIRED) This field provides a unique 12-digit code for each subwatershed. Add two digits to the end of the existing 10-digit code, therefore creating a 12-digit number.Numbers were assigned in an upstream to downstream fashion. Where no downstream/upstream relationship could be determined numbers were assigned in a clockwise fashion. It should be noted that the polygons that cross into Idaho were numbered by Idaho and are not consistent with the above methods. Affected huc_8s include: 17040202, 17040204 and 17040104. Acres: Acres - (REQUIRED) Area of subwatershed including non-contributing areas calculated to acres as a whole number, no decimals. The "Acres" field needs to be calculated from the "Area" field. States: States - (REQUIRED) The "States" field needs to include the names of all state(s) that the subwatershed falls within. Use the 2-digit postal abbreviation in upper case and sort the state(s) in alphabetical order. If using more then one abbreviation, separate with a comma with no space after the comma. Ncontrb_a: Non-Contributing Area - (FIELD REQUIRED, ATTRIBUTES OPTIONAL) Drainage areas that do not flow toward the outlet of any hydrologic unit are considered non-contributing. If a non-contributing area is on the boundary between two or more hydrologic units, determine the low point along the non-contributing area boundary. The non-contributing area should be associated with the hydrologic unit adjacent to the low point on the boundary. This attribute should be the total of the non-contributing areas within a hydrologic unit calculated in acres. Hu_10_ds: Fifth Level Downstream Hydrologic Unit Code - (FIELD REQUIRED, ATTRIBUTES OPTIONAL) Populate this field with the 10-digit code of the 5th level hydrologic unit that is receiving the majority of the flow from the watershed that the 6th level HU falls within. Outlets created by ditching or other artificial drainage are not to be considered for this field. If an HU flows into an ocean or the Gulf of Mexico populate this field with "OCEAN" and if a HU flows into one of the Great Lakes use the term "LAKE". If a HU flows across international borders use "CANADA" or "MEXICO" depending on which country the HU drains into. If an HU is a closed basin, then populate this record with the term "CLOSED BASIN". Hu_10_name: Fifth Level Hydrologic Unit Name - (FIELD REQUIRED, ATTRIBUTES OPTIONAL) This field is for officially recognized names only. Populate this field by following the directions in subsection 6.3 "Watershed and Subwatershed Naming Protocol". Populate this field with the identical name for all 6th level hydrologic units that fall within the same 10-digit HU. The name used to attribute the watershed should be used only once within a 4th level unit. Some 10-digit HU were assigned the huc_10 number when no GNIS name was identified on the DRG-Es. Hu_10_mod: Fifth Level Hydrologic Unit Modifications - (REQUIRED) This field should identify any type of modifications to natural overland flow that alters the location of the hydrologic unit boundary for a 10-digit watershed. In the attribute field, identify from most significant to least significant modification(s). Use one or more of the following abbreviations in uppercase to identify your modification(s). If using more then one abbreviation, separate with a comma with no space after the comma. SC - Stormwater Canal ID - Irrigation Ditch IT - Interbasin Transfer BC - Barge Canal SD - Stormwater Ditch PD - Pipe Diversion CD - Channel Diversion NC - Non-Contributing KA - Karst LE - Levee NM - No Modifications OC - Overflow Channel DM - Dam at outlet or HU boundary OT - Other Hu_10_type: Fifth Level Hydrologic Unit Type - (REQUIRED) Populate this field with the hydrologic unit type from the list provided that most closely identifies the watershed. Use any of the one-digit abbreviations in uppercase that is provided in the list. S - "Standard" hydrologic unit - Any land HU with drainage flowing to a single outlet point, excluding non-contributing areas. This includes areas or small triangular wedges between adjacent HU's that remain after classic hydrologic units are delineated. Some examples include "true", "classic", "composite", and "remnant" hydrologic units. C - "Closed Basin" hydrologic unit - A drainage area that is 100% non-contributing. This means all surface flow is internal, no overland flow leaves the hydrologic unit through the outlet point. F - "Frontal" hydrologic unit - Areas along the coastline of lakes, oceans, bays, etc. that have more than one outlet. These HU's are predominantly land with some water areas at or near the outlet(s). W - "Water" hydrologic unit - Hydrologic units that are predominantly water with adjacent land areas, ex. lake, easturies, harbors. I - "Island" hydrologic unit - A hydrologic unit that is one or more islands and adjacent water out to the toe of the shore face. U - "Unclassified" hydrologic unit - A hydrologic unit that can't be defined or doesn't fit into one of the types that have been listed. Hu_12_ds: Sixth Level Downstream Hydrologic Unit Code - (FIELD REQUIRED, ATTRIBUTES OPTIONAL) Populate this field with the 12-digit code of the 6th level hydrologic unit that is receiving the majority of the flow from the subwatershed. Outlets created by ditching or other artificial drainage are not to be considered for this field. If a HU flows into an ocean or the Gulf of Mexico populate this field with "OCEAN" and if a HU flows into one of the Great Lakes use the term "LAKE". If a HU flows across international borders use "CANADA" or "MEXICO" depending on which country the HU drains into. If an HU is a closed basin, then populate this record with the term "CLOSED BASIN". Hu_12_name: Sixth Level Hydrologic Unit Name - (FIELD REQUIRED, ATTRIBUTES OPTIONAL) This field is for officially recognized names only. Populate this field by following the directions in subsection 6.3 "Watershed and Subwatershed Naming Protocol". The name used to attribute the subwatershed should be used only once within a 6th level unit. Some 10-digit HU were assigned the huc_12 number when no GNIS name was identified on the DRG-Es. Hu_12_mod: Sixth Level Hydrologic Unit Modifications - (REQUIRED) This field should identify any type of modifications to natural overland flow that alters the location of the hydrologic unit boundary for a 12-digit subwatershed. In the attribute field, identify from most significant to least significant modification(s). Use one or more of the following abbreviations in uppercase to identify your modification(s). If using more than one abbreviation, separate with a comma with no space after the comma. SC - Stormwater Canal ID - Irrigation Ditch IT - Interbasin Transfer BC - Barge Canal SD - Stormwater Ditch PD - Pipe Diversion CD - Channel Diversion NC - Non-Contributing KA - Karst LE - Levee NM - No Modifications OC - Overflow Channel DM - Dam at outlet or HU boundary OT - Other Hu_12_type: Sixth Level Hydrologic Unit Type - (REQUIRED) Populate this field with the hydrologic unit type from the list provided that most closely identifies the subwatershed. Use any of the one digit abbreviations in uppercase that is provided in the list. S - "Standard" hydrologic unit - Any land HU with drainage flowing to a single outlet point, excluding non-contributing areas. This includes areas or small triangular wedges between adjacent HU's that remain after classic hydrologic units are delineated. Some examples include "true", "classic", "composite", and "remnant" hydrologic units. C - "Closed Basin" hydrologic unit - A drainage area that is 100% non-contributing. This means all surface flow is internal, no overland flow leaves the hydrologic unit through the outlet point. F - "Frontal" hydrologic unit - Areas along the coastline of lakes, oceans, bays, etc. that have more than one outlet. These HU's are predominantly land with some water at or near the outlet(s). W - "Water" hydrologic unit - Hydrologic units that are predominantly water with adjacent land areas, ex. lake, easturies. I - "Island" hydrologic unit - A hydrologic unit that is one or more islands and adjacent water out to the toe of the shore face. U - "Unclassified" hydrologic unit - A hydrologic unit that can't be defined or doesn't fit into one of the types that have been listed. ArcInfo (.pat) and ArcView Polygon Format Item name Width Output Type (ArcView) N.Dec. Example Huc_8 8 8 C - 01080201 Huc_10 10 10 C - 0108020103 Huc_12 12 12 C - 010802010310 Acres 8 12 F N 0 026739 States 11 11 C - KS,MO,OK Ncontrb_a 8 12 F N 0 357 Hu_10_ds 10 10 C - 1710020504 Hu_10_name 80 80 C - Upper Blue River Hu_10_mod 20 20 C - CB,NC,ID Hu_10_type 1 1 C - S Hu_12_ds 12 12 C - 171002050402 Hu_12_name 80 80 C - Drift Creek-Big Bear River Hu_12_mod 20 20 C - SD,KA,PD Hu_12_type 1 1 C - C 2) .aat attributes Hu_level: Hydrologic Unit Level - (REQUIRED) This field provides the means to create cartographically pleasing maps. Populate this field with the highest hydrologic unit level (smallest number) for the line (arc) represented by the record. Record the level using numbers 1 through 6 representing each level with 1 being the highest and 6 the lowest level. An example would be if a line represents a region, subregion, basin, subbasin, watershed, and subwatershed boundary, then this cell would be populated with a 1 (Region). Example two would be if a line is a subbasin, watershed, and subwatershed boundary, then the cell would get a 4 (Subbasin). Use one of the levels provided in the list below. Level Digit# Name 1 2 Region 2 4 Subregion 3 6 Basin 4 8 Subbasin 5 10 Watershed 6 12 Subwatershed Linesource: Line Spatial Data Source - (REQUIRED) The Linesource should indicate the base map source(s) used to delineate at 1:24,000 scale. Populate the field using one of the standardized code(s) listed below in uppercase. If using more than one code, separate with a comma with no space after the comma. TOPO24 - Delineation from hardcopy 1:24,000 scale topographic maps TOPO25 - Delineation from hardcopy 1:25,000 topgraphic maps, only Alaska and Caribbean TOPO63 - Delineation from hardcopy 1:63,360 topographic maps, only Alaska and Caribbean DRG24 - Delineation from 1:24,000 scale Digital Raster Graphics DRG25 - Delineation from 1:25,000 Digital Raster Graphics, only Alaska and Caribbean DRG63 - Delineation from 1:63,360 Digital Raster Graphics, only Alaska and Caribbean DEM10 - Derived from 10 meter Digital Elevation Model DEM30 - Derived from 30 meter Digital Elevation Model NED30 - Derived from 30 meter National Elevation Dateset Model EDNA30 - (formally NED-H), derived from 30 meter Elevation Derivatives for National Applications BATH"scale" (ex. BATH24) - Interpreted from NOAA 1:24,000 scale bathymetric data HYPSO"scale" (ex. HYPSO24)- Delineated from 1:24,000 scale contour data ORTHO"scale" (ex. ORTHO12) - Interpreted from 1:12,000 scale Ortho-imagery DEDEM10 - Drainage enforced 10 meter Digital Elevation Model DEDEM30 - Drainage enforced 30 meter Digital Elevation Model GPS - Derived from Global Positioning System LIDAR - Derived from LIDAR IFSAR - Derived from IFSAR data OTH - Other UNK - Unknown All other reference and source maps not listed should be noted in the metadata. Meta_id: Metadata ID Number - (REQUIRED) Metadata ID is a code that identifies which metadata file applies to the arc. In many cases there will only be one metadata file. However, in some cases more than one metadata file may be created to identify different groups and/or procedures used to produce the lines. These separate metadata files may be identified for each separate arc. The metadata ID should be a 4-character code starting with the 2-letter state postal code, followed by a 2-digit sequence number. For example "OK01", "ID02", etc. ArcInfo Line (.aat) Attribute Format Item name Width Output Type N.Dec. Example Hu_level 1 1 I - 6 Linesource 20 20 C - DEM30,DRG24,GPS Meta_id 4 4 C - OK01 Federal Standard for Delineation of Hydrologic Unit Boundaries ARCE no compression applied 2.718 2.718 www.wygisc.uwyo.edu/clearinghousewy_hu12 noneDownload from the website www.wygisc.uwyo.edu/clearinghouse.html or e-mail requests. Wendy BerelsonWyoming Geographic Information Science Center - Univ. of Wyomingmailing address

P.O. Box 4008

LaramieWY82071-4008USA307-766-2735307-766-2744berelson@uwyo.edu9-5please e-mail with data requests.The distributor shall not be held liable for improper or incorrect use of this data, based on the description of appropriate/inappropriate uses described in this metadata document. It is strongly recommended that this data is directly acquired from the distributor and not indirectly through other sources which may have changed the data in some way. These data should not be used at scales greater than 1:24,000 for the purpose of identifying hydrographic watershed boundary feature locations in Wyoming. WyGISC (Wyoming Geographic Information Science Center) makes no claims for the data's suitability for other purposes. WyGISC should be acknowledged as the data source in products derived from these data. The Wyominig Watershed Boundary Dataset is public information and may be interpreted by all organizations, agencies, units of government, or others based on needs; however, they are responsible for the appropriate application of the data. Federal, State, or local regulatory bodies are not to reassign to the WyGISC or the Natural Resources Conservation Service any authority for the decisions they make. The Natural Resources Conservation Service will not perform any evaluations of these maps or purposes related solely to State or local regulatory programs. Photographic or digital enlargement of these maps to scales greater than that at which they were originally delineated can result in misrepresentation of the data. If enlarged, the maps will not include the fine detail that would be appropriate for mapping at the small scale. Digital data files are periodically updated. Files are dated, and users are responsible for obtaining the latest version of the data from the source distributor.Downloadable Data 20091106 Wendy Berelson Wyoming Geographic Information Science Center at the University of Wyoming Assistant Research Scientist mailing address

P.O. Box 4008

Laramie WY 82071 USA 307-766-2735 307-766-2744 berelson@uwyo.edu 8-5 (school year): 7:30-4:30 (summer) FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998 local time enhttp://www.esri.com/metadata/esriprof80.htmlESRI Metadata Profile 2007071715280800FALSE20091106095835002009110609583500{B5C83EE8-566A-4BAB-BD5D-B9F97D90A69F}Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.3.1.1850WY_HUC4-111.05571-104.05190345.00676340.9945531-111.05571-104.05190345.00676340.9945531ISO 19115 Geographic Information - MetadataDIS_ESRI1.0dataset002file://\\wrds-auxstor\auxstor\Chris\WWDC\Basin_Advisory_Groups\Green\WSGS_Files\GIS_Files\GGRB_shapefiles\WY_HUC4.shpLocal Area Network2.718ShapefileGCS_North_American_19831420091106