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Reservoir	Location	% Full	SWE % of Avg	Full Capacity (kaf)	Total Capacity (kaf)	Outflow (cfs)
Angostura Reservoir	SD	48	n/a	123	123	187
Alcova Reservoir	WY	98	n/a	184	184	820
Lake Altus	OK	28	n/a	129	149	0
Lake Alice Reservoir	NE	19	n/a	11	11	n/a
Arbuckle Reservoir	OK	102	n/a	72	108	n/a
Buffalo Bill Reservoir	WY	92	n/a	647	647	1940
Bighorn Lake (Yellowtail)	MT	83	n/a	1011	1279	1903
Box Butte Reservoir	NE	27	n/a	29	29	n/a
Belle Fourche Reservoir	SD	56	n/a	173	173	620
Bull Lake Reservoir	WY	83	n/a	152	152	431
Bonny Lake	CO	0	n/a	41	170	2
Boysen Reservoir	WY	72	n/a	742	893	1021
Calamus Reservior	NE	76	n/a	127	127	n/a
Carter Lake Reservoir	CO	73	n/a	112	112	n/a
Cedar Bluff Reservoir	KS	33	n/a	172	364	0
Choke Canyon Reservoir	TX	24	n/a	695	695	n/a
Clark Canyon Reservoir	MT	36	n/a	174	253	473
Canyon Ferry Lake	MT	88	n/a	1892	1993	3315
Cheney Reservoir	KS	106	n/a	167	248	n/a
Fort Cobb Reservoir	OK	91	n/a	74	136	n/a
Davis Creek Reservoir	NE	81	n/a	31	31	n/a
Deerfield Reservoir	SD	92	n/a	16	16	10
E. A. Patterson Lake	ND	72	n/a	9	9	0
Enders Reservoir	NE	20	n/a	43	73	2
Flatiron Reservoir	CO	87	n/a	1	1	476
Foss Reservoir	OK	90	n/a	169	350	n/a
Fresno Reservoir	MT	57	n/a	93	93	968
Gibson Reservoir	MT	68	n/a	99	99	1361
Glendo Reservoir	WY	39	n/a	517	789	7339
Lake Granby	CO	63	n/a	540	540	114
Green Mountain Reservoir	CO	21	n/a	154	154	320
Gray Reef Reservoir	WY	86	n/a	2	2	806
Guernsey Reservoir	WY	54	n/a	46	46	4813
Hugh Butler Lake (Red Willow Dam)	NE	41	n/a	36	85	2
Harlan County Lake	NE	60	n/a	314	814	478
Hebgen Lake	MT	93	n/a	386	400	1440
Horsetooth Reservoir	CO	85	n/a	157	157	263
Harry Strunk Lake (Medicine Creek)	NE	69	n/a	36	88	155
Helena Valley Reservoir	MT	92	n/a	10	10	n/a
Jamestown Reservoir	ND	98	n/a	32	221	13
Keyhole Reservoir	WY	51	n/a	189	329	178
Kortes Reservoir	WY	100	n/a	5	5	1508
Keith Sebelius Lake (Norton Dam)	KS	32	n/a	35	134	1
Kirwin Reservoir	KS	26	n/a	98	313	146
Little Lake Alice Reservoir	NE	26	n/a	1	1	n/a
Lake Elwell (Tiber Reservoir)	MT	96	n/a	926	1329	1157
Lima Reservoir	MT	26	n/a	84	100	44
Lake Minatare Reservoir	NE	30	n/a	59	59	n/a
Lake Tschida	ND	76	n/a	67	214	83
Lovewell Reservoir	KS	66	n/a	36	86	64
Marys Lake	CO	62	n/a	1	1	545
McGee Creek	OK	96	n/a	114	199	n/a
Merritt Reservoir	NE	74	n/a	67	67	n/a
Lake Nasworthy	TX	86	n/a	11	12	n/a
Nelson Reservoir	MT	76	n/a	79	79	216
Lake Thunderbird (Norman Dam)	OK	95	n/a	106	177	1
Lake Estes (Olympus Dam)	CO	71	n/a	3	3	102
Pathfinder Reservoir	WY	19	n/a	1070	1070	1083
Pilot Butte Reservoir	WY	84	n/a	34	34	658
Pinewood Reservoir	CO	55	n/a	2	2	492
Pipestem Lake	ND	105	n/a	9	142	55
Pishkun Reservoir	MT	83	n/a	47	47	1280
Pactola Reservoir	SD	76	n/a	56	99	63
Pueblo Reservoir	CO	54	n/a	323	350	n/a
Ruedi Reservoir	CO	64	n/a	102	102	172
Lake Meredith (Sanford Dam)	TX	28	n/a	896	1358	n/a
Seminoe Reservoir	WY	31	n/a	1017	1017	1506
Shadow Mountain Reservoir	CO	91	n/a	18	18	53
Lake Sherburne	MT	89	n/a	66	66	549
Shadehill Reservoir	SD	80	n/a	120	350	22
Swift Reservoir	MT	n/a	n/a	30	36	n/a
Tom Steed Reservoir (Mtn Park Dam)	OK	70	n/a	97	117	n/a
Swanson Lake (Trenton Dam)	NE	47	n/a	110	244	134
Twin Buttes Reservoir	TX	10	n/a	186	640	n/a
Turquoise Lake (Sugarloaf Dam)	CO	68	n/a	129	129	n/a
Twin Lakes Reservoir	CO	66	n/a	141	141	n/a
Waconda Lake (Glen Elder Dam)	KS	93	n/a	219	942	49
Webster Reservoir	KS	16	n/a	76	259	0
Winters Creek Reservoir	NE	12	n/a	3	3	n/a
Willow Creek Reservoir	MT	53	n/a	32	32	218
Willow Creek Reservoir	CO	70	n/a	11	11	7

Last Updated: 7/30/2026