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Reservoir	Location	% Full	SWE % of Avg	Full Capacity (kaf)	Total Capacity (kaf)	Outflow (cfs)
Angostura Reservoir	SD	62	n/a	123	123	1
Alcova Reservoir	WY	93	n/a	184	184	n/a
Lake Altus	OK	27	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	97	647	647	1077
Bighorn Lake (Yellowtail)	MT	77	87	1011	1279	1572
Box Butte Reservoir	NE	43	n/a	29	29	n/a
Belle Fourche Reservoir	SD	92	n/a	173	173	0
Bull Lake Reservoir	WY	32	61	152	152	29
Bonny Lake	CO	n/a	n/a	41	170	n/a
Boysen Reservoir	WY	72	74	742	893	917
Calamus Reservior	NE	95	n/a	127	127	n/a
Carter Lake Reservoir	CO	92	n/a	112	112	n/a
Cedar Bluff Reservoir	KS	n/a	n/a	172	364	n/a
Choke Canyon Reservoir	TX	7	n/a	695	695	n/a
Clark Canyon Reservoir	MT	63	65	174	253	36
Canyon Ferry Lake	MT	81	72	1892	1993	3161
Cheney Reservoir	KS	108	n/a	167	248	n/a
Fort Cobb Reservoir	OK	98	n/a	74	136	n/a
Davis Creek Reservoir	NE	59	n/a	31	31	n/a
Deerfield Reservoir	SD	95	n/a	16	16	10
E. A. Patterson Lake	ND	87	n/a	9	9	12
Enders Reservoir	NE	20	n/a	43	73	n/a
Flatiron Reservoir	CO	72	n/a	1	1	n/a
Foss Reservoir	OK	96	n/a	169	350	n/a
Fresno Reservoir	MT	37	n/a	93	93	41
Gibson Reservoir	MT	80	62	99	99	1023
Glendo Reservoir	WY	69	7	517	789	n/a
Lake Granby	CO	64	n/a	540	540	27
Green Mountain Reservoir	CO	35	n/a	154	154	99
Gray Reef Reservoir	WY	n/a	n/a	2	2	n/a
Guernsey Reservoir	WY	n/a	n/a	46	46	n/a
Hugh Butler Lake (Red Willow Dam)	NE	43	n/a	36	85	n/a
Harlan County Lake	NE	n/a	n/a	314	814	n/a
Hebgen Lake	MT	85	48	386	400	665
Horsetooth Reservoir	CO	91	n/a	157	157	120
Harry Strunk Lake (Medicine Creek)	NE	91	n/a	36	88	n/a
Helena Valley Reservoir	MT	95	n/a	10	10	n/a
Jamestown Reservoir	ND	113	n/a	32	221	398
Keyhole Reservoir	WY	58	n/a	189	329	0
Kortes Reservoir	WY	n/a	n/a	5	5	n/a
Keith Sebelius Lake (Norton Dam)	KS	n/a	n/a	35	134	n/a
Kirwin Reservoir	KS	33	n/a	98	313	n/a
Little Lake Alice Reservoir	NE	n/a	n/a	1	1	n/a
Lake Elwell (Tiber Reservoir)	MT	89	84	926	1329	504
Lima Reservoir	MT	70	47	84	100	2
Lake Minatare Reservoir	NE	11	n/a	59	59	n/a
Lake Tschida	ND	92	n/a	67	214	80
Lovewell Reservoir	KS	n/a	n/a	36	86	n/a
Marys Lake	CO	69	n/a	1	1	18
McGee Creek	OK	92	n/a	114	199	n/a
Merritt Reservoir	NE	92	n/a	67	67	n/a
Lake Nasworthy	TX	87	n/a	11	12	n/a
Nelson Reservoir	MT	73	n/a	79	79	0
Lake Thunderbird (Norman Dam)	OK	95	n/a	106	177	n/a
Lake Estes (Olympus Dam)	CO	69	n/a	3	3	54
Pathfinder Reservoir	WY	31	n/a	1070	1070	n/a
Pilot Butte Reservoir	WY	87	n/a	34	34	113
Pinewood Reservoir	CO	66	n/a	2	2	4
Pipestem Lake	ND	347	n/a	9	142	18
Pishkun Reservoir	MT	59	n/a	47	47	0
Pactola Reservoir	SD	85	n/a	56	99	25
Pueblo Reservoir	CO	66	n/a	323	350	n/a
Ruedi Reservoir	CO	66	n/a	102	102	75
Lake Meredith (Sanford Dam)	TX	29	n/a	896	1358	n/a
Seminoe Reservoir	WY	33	38	1017	1017	n/a
Shadow Mountain Reservoir	CO	92	n/a	18	18	120
Lake Sherburne	MT	89	81	66	66	596
Shadehill Reservoir	SD	87	n/a	120	350	23
Swift Reservoir	MT	n/a	n/a	30	36	n/a
Tom Steed Reservoir (Mtn Park Dam)	OK	77	n/a	97	117	n/a
Swanson Lake (Trenton Dam)	NE	n/a	n/a	110	244	n/a
Twin Buttes Reservoir	TX	12	n/a	186	640	n/a
Turquoise Lake (Sugarloaf Dam)	CO	62	n/a	129	129	n/a
Twin Lakes Reservoir	CO	68	n/a	141	141	n/a
Waconda Lake (Glen Elder Dam)	KS	n/a	n/a	219	942	n/a
Webster Reservoir	KS	n/a	n/a	76	259	n/a
Winters Creek Reservoir	NE	n/a	n/a	3	3	n/a
Willow Creek Reservoir	MT	51	n/a	32	32	0
Willow Creek Reservoir	CO	65	n/a	11	11	7

Last Updated: 4/19/2026