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Reservoir
Location
% Full
SWE % of Avg
Full Capacity (kaf)
Total Capacity (kaf)
Outflow (cfs)
Angostura Reservoir
SD
59
n/a
123
123
126
Alcova Reservoir
WY
98
n/a
184
184
502
Lake Altus
OK
26
n/a
129
149
0
Lake Alice Reservoir
NE
0
n/a
11
11
n/a
Arbuckle Reservoir
OK
104
n/a
72
108
n/a
Buffalo Bill Reservoir
WY
71
106
647
647
1961
Bighorn Lake (Yellowtail)
MT
80
87
1011
1279
1823
Box Butte Reservoir
NE
44
n/a
29
29
n/a
Belle Fourche Reservoir
SD
84
n/a
173
173
424
Bull Lake Reservoir
WY
42
32
152
152
63
Bonny Lake
CO
0
n/a
41
170
2
Boysen Reservoir
WY
69
53
742
893
1071
Calamus Reservior
NE
95
n/a
127
127
n/a
Carter Lake Reservoir
CO
85
n/a
112
112
n/a
Cedar Bluff Reservoir
KS
33
n/a
172
364
0
Choke Canyon Reservoir
TX
7
n/a
695
695
n/a
Clark Canyon Reservoir
MT
54
n/a
174
253
535
Canyon Ferry Lake
MT
83
56
1892
1993
3374
Cheney Reservoir
KS
108
n/a
167
248
n/a
Fort Cobb Reservoir
OK
96
n/a
74
136
n/a
Davis Creek Reservoir
NE
96
n/a
31
31
n/a
Deerfield Reservoir
SD
95
n/a
16
16
10
E. A. Patterson Lake
ND
83
n/a
9
9
0
Enders Reservoir
NE
20
n/a
43
73
2
Flatiron Reservoir
CO
82
n/a
1
1
n/a
Foss Reservoir
OK
94
n/a
169
350
n/a
Fresno Reservoir
MT
42
n/a
93
93
1316
Gibson Reservoir
MT
100
n/a
99
99
4263
Glendo Reservoir
WY
76
n/a
517
789
26
Lake Granby
CO
65
n/a
540
540
78
Green Mountain Reservoir
CO
34
n/a
154
154
62
Gray Reef Reservoir
WY
82
n/a
2
2
500
Guernsey Reservoir
WY
43
n/a
46
46
2
Hugh Butler Lake (Red Willow Dam)
NE
43
n/a
36
85
2
Harlan County Lake
NE
68
n/a
314
814
0
Hebgen Lake
MT
96
25
386
400
470
Horsetooth Reservoir
CO
94
n/a
157
157
59
Harry Strunk Lake (Medicine Creek)
NE
93
n/a
36
88
67
Helena Valley Reservoir
MT
88
n/a
10
10
n/a
Jamestown Reservoir
ND
98
n/a
32
221
149
Keyhole Reservoir
WY
57
n/a
189
329
0
Kortes Reservoir
WY
100
n/a
5
5
540
Keith Sebelius Lake (Norton Dam)
KS
36
n/a
35
134
1
Kirwin Reservoir
KS
33
n/a
98
313
0
Little Lake Alice Reservoir
NE
11
n/a
1
1
n/a
Lake Elwell (Tiber Reservoir)
MT
95
82
926
1329
610
Lima Reservoir
MT
75
n/a
84
100
491
Lake Minatare Reservoir
NE
30
n/a
59
59
n/a
Lake Tschida
ND
90
n/a
67
214
10
Lovewell Reservoir
KS
88
n/a
36
86
0
Marys Lake
CO
52
n/a
1
1
185
McGee Creek
OK
93
n/a
114
199
n/a
Merritt Reservoir
NE
98
n/a
67
67
n/a
Lake Nasworthy
TX
85
n/a
11
12
n/a
Nelson Reservoir
MT
60
n/a
79
79
393
Lake Thunderbird (Norman Dam)
OK
95
n/a
106
177
n/a
Lake Estes (Olympus Dam)
CO
67
n/a
3
3
124
Pathfinder Reservoir
WY
30
n/a
1070
1070
734
Pilot Butte Reservoir
WY
71
n/a
34
34
603
Pinewood Reservoir
CO
57
n/a
2
2
440
Pipestem Lake
ND
323
n/a
9
142
259
Pishkun Reservoir
MT
96
n/a
47
47
1436
Pactola Reservoir
SD
83
n/a
56
99
51
Pueblo Reservoir
CO
62
n/a
323
350
n/a
Ruedi Reservoir
CO
68
n/a
102
102
104
Lake Meredith (Sanford Dam)
TX
29
n/a
896
1358
n/a
Seminoe Reservoir
WY
37
40
1017
1017
543
Shadow Mountain Reservoir
CO
93
n/a
18
18
458
Lake Sherburne
MT
86
162
66
66
488
Shadehill Reservoir
SD
85
n/a
120
350
23
Swift Reservoir
MT
n/a
n/a
30
36
n/a
Tom Steed Reservoir (Mtn Park Dam)
OK
73
n/a
97
117
n/a
Swanson Lake (Trenton Dam)
NE
51
n/a
110
244
1
Twin Buttes Reservoir
TX
12
n/a
186
640
n/a
Turquoise Lake (Sugarloaf Dam)
CO
71
n/a
129
129
n/a
Twin Lakes Reservoir
CO
64
n/a
141
141
n/a
Waconda Lake (Glen Elder Dam)
KS
75
n/a
219
942
51
Webster Reservoir
KS
14
n/a
76
259
0
Winters Creek Reservoir
NE
12
n/a
3
3
n/a
Willow Creek Reservoir
MT
72
n/a
32
32
0
Willow Creek Reservoir
CO
72
n/a
11
11
7
Last Updated: 5/29/2026