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

Bear River Basin Water Plan
Technical Memoranda

SUBJECT: Appendix D
Key Structures and Diversions
EVANSTON PIPELINE DIVERSION

PREPARED BY: Bear River Basin Planning Team

DATE: August 7, 2000









Diversion Description: The Evanston headgate structure consists of a permanent notched 
concrete cut-off wall constructed across the river.  The wall can be raised during low 
flows using boards.  Historically this has not been required. The water is divererted into a 
concrete settling basin approximately 142 feet wide by 250 feet long.  The headwall of 
the basin has a trash rack and a series of inlet gates (three (3)  4’ x 6’ slide gates and nine 
(9) 24-inch canal gates) at varying elevations to control inflow.  Water is delivered from 
the basin to control building located about 600 feet downstream through a 36-inch steel 
pipe.  Flow is measured at that building using a Parshall Flume.


Evanston Intake Facility on the Bear River






Evanston Intake Settling Basin		
The facility also includes an infiltration gallery with approximatley 3300 linear feet of 
12-inch diameter perforated pipe under the river. The inflitration gallery is located 
immediately upstream of the cut-off wall an has an estimated capacity of approximately 8 
CFS.  Water is delivered from the gallery to the control building through a 24-inch pipe.  
Flow is measured in that building using a second Parshall Flume.


The Evanston Pipeline and Diversion facilities were constructed and placed in service in 
1989.2







Diversion Location: Diversion is on the Upper Bear in Wyoming as shown on the location map 
hereafter.  

					

Latitude  	N   41° 08' 57.0"	

Longitude     	W 110° 52'  47.0"






Conveyance Description: Water is conveyed through 24,000 feet of 36-inch steel pipeline north 
to a junction vault located on the north side of Highway 150 .  From the junction 
vault, water can be conveyed to and from Sulphur Creek Reservoir through 
11,200 feet of 36-inch steel pipeline.  Water is also conveyed from the junction 
vault to the City of Evanston through approximately 7 miles of 30-inch steel 
pipeline.  The junction vault is metered to record water delivery to and from the 
reservoir as well as delivery to the city.3


Construction Photo of Evanston
 Pipeline junction vault









Direct Flow Water Rights:1





Priority Date 
Permit 
Number		
Permitted Use 
Permitted 
Acres		 
Flow 
(CFS)		
Cumulative 
(CFS)		 
Comments


-1869 
Terr
Irrigation, RR 
4.50
0.60 
0.60 
PL, Pump, Tank at Evanston


03-28-1875 
Terr
Municipal 
63.02 A/F
0.33 
0.93 
Evanston Ditch (May-Sept)


03-28-1875 
Terr
Municipal 
94.50 A/F
0.45 
1.38 
Evanston Ditch (May-Sept)


03-28-1875 
Terr
Municipal 
76.06 A/F
0.39 
1.77 
Evanston Ditch (May-Sept)


03-28-1875 
Terr
Municipal 
106.05 A/F
0.50 
2.27 
Evanston Ditch (May-Sept)


-1875 
Terr
Irrigation, Municipal, Storage 


4.00 
6.27 
Evanston Water Supply Ditch


08-28-1893 
563
Irrigation, Municipal, Dom., Storage 


3.00 
9.27 
Evanston Water Supply Ditch


03-29-1901 
693E
Municipal 
178.5 A/F
0.85 
10.12 
Enl Anderson (May 15-Sept)


01-11-1902 
3643
RR 


0.27 
10.39 
PL, Windmill, Pump, Tanks at Mills


09-22-1915 
3520E
Municipal 
99.27 A/F
0.51 
10.90 
Evanston Water Ditch (May-Sept)


09-22-1915 
3520E
Municipal 
143.85 A/F
0.69 
11.59 
Evanston Water Ditch (May 15-Sept)


09-28-1933 
4942E
Municipal 
52.50 A/F
0.25 
11.84 
Evanston Water Supply Ditch (May 15-Sept)


04-17-1974 
24325
Municipal 


7.55 
19.39 



02-01-1988 
6911E
RS 
14060.3 A/F

 

 
Enl Sulphur Creek Reservoir






Associated Storage Rights:





Reservoir
Shareholder
Volume 
(Acre-ft)		
Est. % of Shares Used this Diversion3
Comments


Sulphur Creek
City of Evanston
12,837
100%


 
     




Irrigation Practices:  Not Applicable.  Water is all municipal use. 


Estimated Diversion Efficiency:  Not Applicable. 


Crop Types / Consumptive Use:  Not Applicable


Return Flows:   Evanston utilizes a mechanical water treatment plant that discharges wastewater 
into the Yellow Creek tributary of the Bear River.  Recorded average wastewater effluent for the 
past 7 years (1993-1999) was  1.41 MGD (4.33 AFD).  Average annual wastewater effluent is 
504 MG or 1,547 acre-feet.


Other Operational Information:   The Evanston Pipeline and Intake Facility was not placed in 
service until 1989.  Prior to this time, the City of Evanston utilized the Evanston Water 
Supply Ditch to meet their municipal needs.   See Evanston Municipal Water Use Memo 
in Appendix “J”.



References:



    

  1. 	Water rights summary obtained from State Engineer Interstate Reglist – revised April 14, 
1999

    

  2. 	Forsgren Associates Engineering p.a., Design Drawings – City of Evanston Bear River 
Intake Facilities, 1988

    

  3. 	Forsgren Associates Engineering p.a., Design Drawings – City of Evanston Bear River 
Pipeline, 1989










click to enlarge

	





Monthly Diversion Records

Evanston Pipeline (City of Evanston)


		




YEAR
MAY
JUNE
JULY
AUGUST
SEPTEMBER


Total of Daily Ave for Month
Average
CFS		
Monthly Total
Ac-Ft		
Total of Daily Ave for Month
Average
CFS		
Monthly Total
Ac-Ft		
Total of Daily Ave for Month
Average
CFS		
Monthly Total
Ac-Ft		
Total of Daily Ave for Month
Average
CFS		
Monthly Total
Ac-Ft		
Total of Daily Ave for Month
Average
CFS		
Monthly Total
Ac-Ft


1970































1971































1972































1973































1974































1975































1976































1977































1978































1979































1980































1981































1982































1983































1984































1985































1986































1987































1988































*1989


4.4
273.1


7.3
433.8


12.5
767.8


10.4
640.8


7.4
437.5


*1990


6.5
402.5


9.1
539.6


11.9
734.2


10.8
664.4


7.5
449.1


*1991


4.2
256.1


7.8
463.1


11.4
699.5


8.3
511.8


6.1
361.5


*1992


7.3
447.6


10.1
600.6


10.6
650.3


11.2
690.7


7.3
434.5


1993
149
4.8
295.5
246
8.2
487.9
280
9.0
555.4
247
8.0
489.9
228
7.6
452.2


1994
210
6.8
416.5
350
11.7
694.2
402
13.0
797.4
334
10.8
662.5
238
7.9
472.1


1995
120
3.9
238.0
184
6.1
365.0
324
10.5
642.6
360
11.6
714.0
284
9.5
563.3


1996
180
5.8
357.0
323
10.8
640.7
385
12.4
763.6
400
12.9
793.4
271
9.0
537.5


1997
188.5
6.1
373.9
264.6
8.8
524.8
420.2
13.6
833.5
333.1
10.7
660.7
231.2
7.7
458.6


1998
179.2
5.8
355.4
220.2
7.3
436.8
375.4
12.1
744.6
346.5
11.2
687.3
239.9
8.0
475.8


1999
140
4.5
277.7
283
9.4
561.3
375
12.1
743.8
333
10.7
660.5
233
7.8
462.1





AVERAGES


5.5
335.8


8.8
522.5


11.7
721.2


10.6
652.4


7.8
464.0



Notes:

1. Pipeline was constructed in 1988 and placed in operation the following year.
Prior to that time, the city received water from the "Evanston Water Supply" diversion.

*2.  No diversion records are available from 1989 through 1992. Data 
reflects water treatment plant records for those years.

3. Evanston's water treatment plant was expanded in 1990. Prior to that time, the
city was reliant on groundwater wells to meet peak demands.












To the Bear River Basin Plan Water Plan