Wyoming State Water Plan, Wyoming Water Development Office
Rafting on Snake River Lake Marie, Snowy Mountains Wyoming Wind River Range picture

Northeast Wyoming River Basins Water Plan
Technical Memoranda

SUBJECT: Appendix J
Storage Operation and Description
BETTY NO. 1

PREPARED BY: HKM Engineering Inc.

DATE: March 2002





KEY STORAGE FACILITIES





Reservoir: 
BETTY NO. 1




Date:	
22 Feb. 2001



Location:
SESW 35, T40N, R72W



Owner:
RANCH CO. (STEVE DILTS)



Year of Construction:
1954



Enlargement History:
1956



Total Storage:
2029 acre-feet



Active Storage:
1345 acre-feet



Dead Storage:
28.30 acre-feet



Area/Capacity Data:
	(Source: .Map to Accompany Applications for First Enlargement, Betty 
No. 1 Reservoir, Betty No. 2 Ditch, and Betty No. 3 Ditch,. on file in 
Safety of Dams office, SEO, Cheyenne, Wyoming.)









Contour
Area (acres)
Average
Capacity (af)


80
1.8









5.66
28.30


85
9.52









16.29
81.45


90
23.06









35.39
176.95


95
47.72









74.92
374.60


100
102.12





PRESENT AVAILABLE CAPACITY
661.30


100
102.12









136.75
683.75


105
171.38







Proposed Enlargement
683.75




Proposed Total Capacity
1345.05







Dam Construction Type:
Earth Fill

	

Outlet:
Eight-inch welded steel pipe in dam;

	Twelve-inch welded steel pipe in dike to east of dam



Spillway:
East (dam) spillway:

	100 feet wide at base, 140 feet wide at dam crest, walls at 3:1 
      slope. Max flow: 1778.40 cfs





West (dike) spillway:

	515-foot-wide notch cut at approx. 3:1 slope, 5 feet deep at deepest 
      point. Max flow: 11,553.65 cfs



End-of-Month Storage Records:
No



Water Rights:
(Source: Tabulation of Adjudicated Surface Water Rights of the State of 
Wyoming, Water Division Number Two, Oct. 1999)







Reservoir
Permit Number
Permitted Use
Priority Date
Volume (af)
Headgate Location (S-T-R)


Betty No. 1 Res.
6124R
I,S
03-18-1954
661.3
35-40-072


First Enl. Betty No. 1
6322R
I,S
04-24-1956
683.75
35-40-072








Designated Use:
Irrigation



Associated Irrigation Diversions:
Betty No. 2 and Betty No. 3 ditches



Associated Industrial Diversions:
None



Operational Discussion:	
Betty No. 1 Reservoir receives water from Bear and Lonetree 
Creeks, and according to the permit that accompanies its first 
enlargement petition, two centrifugal pumps pull water from the 
reservoir to water the ditches on either side of the headgates.



References:
Map to Accompany Applications for First Enlargement Betty No. 1 
Reservoir, Betty No. 2 Ditch, and Betty No. 3 Ditch, John C. Dilts, 
Douglas, Wyoming, 25 Sept. 1956.






Betty No. 1 Dam cross section (Source: .Map to Accompany Applications for First Enlargement, Betty No. 1 Reservoir, Betty No. 2 Ditch, and 
Betty No. 3 Ditch,. on file in Safety of Dams office, SEO, Cheyenne, Wyoming.):







Net Evaporation from Betty No. 1 Reservoir:





Lewis Annual Evaporation (in.)
45


Total Storage (acre-feet)
2,029












Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec



Average percent of storage
52.1
55.7
63.8
67.0
73.3
74.9
73.5
71.3
69.2
51.6
51.3
51.5



Generated storage (acre-feet)
1057
1129
1294
1359
1488
1519
1491
1447
1405
1046
1041
1044



Corresponding area (acres)
121.3
125.1
133.6
136.9
143.5
145.1
143.7
141.4
139.3
120.8
120.5
120.7



Calculations:


Monthly Lewis Evap. (inches)
1.215
1.125
1.755
3.6
5.175
5.895
7.695
7.02
5.175
3.42
1.755
1.17



Monthly Precipitation (inches)
0.25
0.25
0.75
1.75
2.75
2.25
1.75
1.25
1.25
0.75
0.75
0.25



Net Evaporation (inches)
0.965
0.875
1.005
1.85
2.425
3.645
5.945
5.77
3.925
2.67
1.005
0.92
TOTAL


Total Net Evaporation (acre-feet)
10
9
11
21
29
44
71
68
46
27
10
9
355