Storage from official US gauges (USGS, USACE, Bureau of Reclamation, CDEC). Fill % uses design capacity from the National Inventory of Dams where available; a few sites without a match fall back to the 5-year maximum.

Major reservoirs — data pending

⏳

Seminoe Dam & Reservoir — data sourcing in progress

Storage is monitored by the US Army Corps of Engineers (USACE CWMS), but the live feed is currently stale — we are working to restore it. Known capacities: Seminoe Dam & Reservoir (1.3 km³).

Seminoe Dam & Reservoir

Sourcing

Capacity: 1,255 hm³⏳ Pending

About reservoirs in Wyoming

As of September 10, 2026, the reservoirs we track across Wyoming that report live levels hold roughly 3,791 hm³ of water — about 38.0% of their combined capacity. Taken together, Wyoming's reservoirs are low.

Across the region, 8 reservoirs are at critically low levels and 6 are low. Kortes Dam & Reservoir is the fullest at 99.5%, while South Fork Dike at Buffalo Bill Reservoir is the lowest at 0.4%.

Over the most recent week on record, 2 reservoirs rose and 7 reservoirs fell across Wyoming.

Storage figures for Wyoming come from USGS · USACE · BOR · CDEC; the most recent reading is from September 10, 2026. Each reservoir below links to its own page with full history and seasonal context.

Wyoming at a glance

Reservoirs tracked: 25
Average fill: 38.0%
Water stored: 3,791 hm³
Combined capacity: 9,969 hm³
At critically low levels: 8
Fullest: Kortes Dam & Reservoir (99.5%)
Lowest: South Fork Dike at Buffalo Bill Reservoir (0.4%)
Last updated: September 10, 2026

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