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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