Wyoming State Water Plan, Wyoming Water Development Office
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Bear River Basin Water Plan
Technical Memoranda

SUBJECT: Appendix D
Key Structures and Diversions
MYERS IRRIGATION DIVERSION

PREPARED BY: Bear River Basin Planning Team

DATE: August 7, 2000










Diversion Description: The headgate structure consists of a concrete headwall with a 36-inch 
CMP squash pipe inlet and a steel slide gate.  The structure is located immediately off the 
riverbank. 



Myers Irrigation diversion headwall





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

					

Latitude  	N   41° 08' 57.0"	

Longitude     	W 110° 52'  47.0"





Conveyance Description: Open Channel Canal.



Direct Flow Water Rights:2





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


05-01-1862 
Terr
Irrigation 
280
4.00 
4.00 







Associated Storage Rights:	None


Irrigation Practices:  Land is all flood irrigated.3 









click to enlarge




Estimated Diversion Efficiency:  Canal losses are relatively high due to porous nature of 
soils in the higher reaches of the Upper Bear.  




Calculated Diversion Efficiency = Conveyance Efficiency X Application Efficiency:





Conveyance Efficiency: 55%


Application Efficiency: 55%


Overall Diversion Efficiency: 30%








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.





Crop Types / Consumptive Use:  Water is used entirely to irrigate mixed meadow grasses, 
primarily Meadow Foxtail, Redtop, etc.3


Return Flows:  Return flow is primarily intercepted by the Anel Canal.



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%
                3                        0%
				       100%



	
		
Other Operational Information:   The Myers Irrigation ditch has the oldest water right in 
Wyoming.  As a result, it is heavily used without regulation.3


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

Myers Irrigation







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
12
0.4
23.8
193
6.4
382.8
230
7.4
456.2
102
3.3
202.3
39
1.3
77.4


1972
15
0.5
29.8
83
2.8
164.6
133
4.3
263.8
234
7.5
464.1
144
4.8
285.6


1973
0
0.0
0.0
198
6.6
392.7
106
3.4
210.2
94
30
186.4
0
0.0
0.0


1974
0
0.0
0.0
254
8.5
503.8
164
5.3
325.3
118
3.8
234.0
24
0.8
47.6


1975
0
0.0
0.0
62
2.1
123.0
254
8.2
503.8
0
0.0
0.0
90
3.0
178.5


1976
43
1.4
85.3
233
7.8
462.1
134
4.3
265.8
69
2.2
136.9
118
3.9
234.0


1977
92
3.0
182.5
64
2.1
126.9
137
4.4
271.7
84
2.7
166.6
72
2.4
142.8


1978
5
0.2
9.9
130
4.3
257.9
158
5.1
313.4
165
5.3
327.3
28
0.9
55.5


1979
120
3.9
238.0
179
6.0
355.0
149
4.8
295.5
75
2.4
148.8
0
0.0
0.0


1980
0
0.0
0.0
222
7.4
440.3
135
4.4
267.8
51
1.6
101.2
0
0.0
0.0


1981
192
6.2
380.8
90
3.0
178.5
146
4.7
289.6
117
3.8
232.1
42
1.4
83.3


1982
26
0.8
51.6
169
5.6
335.2
88
2.8
174.5
107
3.5
212.2
44
1.5
87.3


1983
0
0.0
0.0
0
0.0
0.0
102
3.3
202.3
82
2.6
162.6
0
0.0
0.0


1984
0
0.0
0.0
87
2.9
172.6
265
8.5
525.6
187
6.0
370.9
0
0.0
0.0


1985
36
1.2
71.4
162
5.4
321.3
146
4.7
289.6
113
3.6
224.1
89
3.0
176.5


1986
0
0.0
0.0
129
4.3
255.9
115
3.7
228.1
72
2.3
142.8
42
1.4
83.3


1987
149
4.8
295.5
130
4.3
257.9
137
4.4
271.7
146
4.7
289.6
79
2.6
156.7


1988
211
6.8
418.5
152
5.1
301.5
132
4.3
261.8
137
4.4
271.7
41
1.4
81.3


1989
22
0.7
43.6
146
4.9
289.6
157
5.1
311.4
102
3.3
202.3
19
0.6
37.7


1990
101
3.3
200.3
136
4.5
269.8
101
3.3
200.3
71
2.3
140.8
19
0.6
37.7


1991
0
0.0
0.0
97
3.2
192.4
175
5.6
347.1
115
3.7
228.1
2
0.1
4.0


1992
125
4.0
247.9
130
4.3
257.9
83
2.7
164.6
0
0.0
0.0
7
0.2
13.9


1993
128
4.1
253.9
259
8.6
513.7
132
4.3
261.8
99
3.2
196.4
31
1.0
61.5


1994
47
1.5
93.2
90
3.0
178.5
15
0.5
29.8
0
0.0
0.0
0
0.0
0.0


1995
0
0.0
0.0
112
3.7
222.1
90
2.9
178.5
104
3.4
206.3
23
0.8
45.6


1996
13
0.4
25.8
223
7.4
442.3
68
2.2
134.9
65
2.1
128.9
0
0.0
0.0


1997
56
1.8
111.1
320
10.7
634.7
146.8
4.7
291.2
42.4
1.4
84.1
43.1
1.4
85.5


1998
72.4
2.3
143.6
136.7
4.6
271.1
242.9
7.8
481.8
132
4.3
261.8
62.9
2.1
124.8


1999
31
1.0
61.5
211
7.0
418.5
42
1.4
83.3
1
0.0
2.0
1
0.0
2.0





AVERAGES


1.7
102.3


5.1
300.8


4.4
272.5


3.0
183.6


1.2
72.5



Notes:

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












To the Bear River Basin Water Plan