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 WATER SUPPLY
(and Anderson)

PREPARED BY: Bear River Basin Planning Team

DATE: August 7, 2000








Diversion Description: Simple headgate structure with slide gate.



Diversion Location:	Diversion and irrigated lands are in the Upper Bear River Basin in 
Wyoming as shown on the location map hereafter.



Conveyance Description: Open channel canal, approximately 26,400 feet in length.1



Direct Flow Water Rights:2





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


05-15-1882 
Terr
Irrigation 
100
1.43 
1.43 



03-29-1901 
693E
Irrigation, Domestic, Storage 
279.93
4.00 
5.43 
Enl Anderson


09-10-1921 
4263E
Irrigation, Domestic, Storage 
9
0.13 
5.56 



09-10-1921 


Irrigation Supplemental Supply, Domestic, Storage 
6
1.57 

 
Buchanan (Knight Hollow Spring 1)






Irrigation Practices:  Land is all flood irrigated.3 








click to enlarge



Estimated Diversion Efficiency:





Calculated Diversion Efficiency = Conveyance Efficiency X Application Efficiency:





Conveyance Efficiency: 50%


Application Efficiency: 55%


Overall Diversion Efficiency: 27%








Conveyance efficiency is estimated by total length of main canal. Application efficiency 
for flood irrigation and sprinkler irrigation is estimated at 55% and 85% respectively.





CropTypes / Consumptive Use:  Water is used primarily to irrigate mixed meadow grasses, 
primarily Meadow Foxtail, Redtop, etc. 


Return Flows:  Return flow is primarily intercepted by the Rocky Mountain & Blythe Canal 
(approx. 50%) and the John Sims Ditch (approx. 50%).


The following return flow pattern was adopted for modeling in this study are as follows: 



	
		Month
      (after initial Diversion)	 Percent of Return
		0			70%
		1			20%
		2		        10%
				       100%



	
			
Other Operational Information:  The Evanston Water Supply Ditch diversions included 
municipal demands from the City of Evanston prior to 1989.  The City’s 7.25 CFS water right 
was transferred to the Evanston Pipeline diversion at that time. 



References:

    

  1. 	USDA -Soil Conservation Service Economic Research Service-Forest Service in Cooperation 
with the States of Idaho, Utah, Wyoming, Irrigation Conveyance Systems, Working Paper for 
the Bear River Basin Type IV Study, Idaho-Utah-Wyoming, April 1976

    

  2. 	Water rights summary obtained from State Engineer Interstate Reglist - revised April 14, 
1999

    

  3. 	Irrigation practices based on field investigation and interview with Mr. Don Shoemaker, 
Water Hydrographer-Commissioner  -  November 12,1999.

    

  4. 	State of Utah Natural Resources, Water Budget Studies - Utah, Bear River Study Area, 
September 1994.






Monthly Diversion Records

Evanston Water Supply







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
38
1.2
75.4
575
19.2
1140.5
451
14.5
894.5
496
16.0
983.8
308
10.3
610.9


1972
0
0.0
0.0
183
6.1
363.0
385
12.4
763.6
312
10.1
618.8
0
0.0
0.0


1973
0
0.0
0.0
375
12.5
743.8
324
10.5
642.6
274
8.8
543.5
80
2.7
158.7


1974
22
0.7
43.6
328
10.9
650.6
354
11.4
702.1
235
7.6
466.1
47
1.6
93.2


1975
50
1.6
99.2
240
8.0
476.0
654
21.1
1297.2
255
8.2
505.8
217
7.2
430.4


1976
246
7.9
487.9
392
13.1
777.5
339
10.9
672.4
271
8.7
537.5
227
7.6
450.2


1977
216
7.0
428.4
278
9.3
551.4
249
8.0
493.9
184
5.9
365.0
125
4.2
247.9


1978
0
0.0
0.0
261
8.7
517.7
313
10.1
620.8
312
10.1
618.8
107
3.6
212.2


1979
159
5.1
315.4
402
13.4
797.4
304
9.8
603.0
199
6.4
394.7
18
0.6
35.7


1980
81
2.6
160.7
382
12.7
757.7
301
9.7
597.0
115
3.7
228.1
35
1.2
69.4


1981
81
2.6
160.7
175
5.8
347.1
114
3.7
226.1
84
2.7
166.6
7
0.2
13.9


1982
0
0.0
0.0
25
0.8
49.6
57
1.8
113.1
54
1.7
107.1
69
2.3
136.9


1983
31
1.0
61.5
40
1.3
79.3
81
2.6
160.7
67
2.2
132.9
30
1.0
59.5


1984
14
0.5
27.8
43
1.4
85.3
15
0.5
29.8
0
0.0
0.0
0
0.0
0.0


1985
17
0.5
33.7
242
8.1
480.0
130
4.2
257.9
81
2.6
160.7
235
7.8
466.1


1986
52
1.7
103.1
48
1.6
95.2
100
3.2
198.3
182
5.9
361.0
130
4.3
257.9


1987
116
3.7
230.1
197
6.6
390.7
208
6.7
412.6
282
9.1
559.3
68
2.3
134.9


1988
31
1.0
61.5
105
3.5
208.3
220
7.1
436.4
165
5.3
327.3
30
1.0
59.5


1989
53
1.7
105.1
58
1.9
115.0
61
2.0
121.0
103
3.3
204.3
50
1.7
99.2


1990
18
0.6
35.7
45
1.5
89.3
5
0.2
9.9
0
0.0
0.0
0
0.0
0.0


1991
7
0.2
13.9
34
1.1
67.4
2
0.1
4.0
3
0.1
6.0
3
0.1
6.0


1992
2
0.1
4.0
21
0.7
41.7
0
0.0
0.0
0
0.0
0.0
0
0.0
0.0


1993
2
0.1
4.0
21
0.7
41.7
13
0.4
25.8
0
0.0
0.0
0
0.0
0.0


1994
0
0.0
0.0
2
0.1
4.0
0
0.0
0.0
0
0.0
0.0
0
0.0
0.0


1995
0
0.0
0.0
24
0.8
47.6
55
1.8
109.1
27
0.9
53.6
8
0.3
15.9


1996
14
0.5
27.8
15
0.5
29.8
56
1.8
111.1
46
1.5
91.2
65
2.2
128.9


1997
13
0.4
25.8
19.2
0.6
38.1
3.1
0.1
6.1
3.1
0.1
6.1
4.2
0.1
8.3


1998
0
0.0
0.0
14.3
0.5
28.4
97.9
3.2
194.2
81.2
2.6
161.1
64.3
2.1
127.5


1999
4
0.1
7.9
76
2.5
150.7
107
3.5
212.2
50
1.6
99.2
29
1.0
57.5





AVERAGES


1.4
86.7


5.3
316.0


5.6
341.9


4.3
265.5


2.2
133.8



Notes:

*1. No published records are available for this diversion for 1970

2. Evanston Water Supply included City of Evanston demands prior to construction
of Evanston Pipeline in 1989. City's 3 CFS direct flow right was transferred to the
Evanston Pipeline at that time.












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