Seminoe Reservoir water level
▼ 14 points from 37.4% a year ago
Source: data.usbr.gov/rise/api/catalog-item/733, accessed October 1, 2026. Updated every 6 hours.
Seminoe Reservoir is at 23.5% of full pool (6294.74 ft) as of September 27, 2026. Seminoe Reservoir was last full on July 25, 2010 (95% of normal storage). Seminoe Reservoir is near Sinclair, Wyoming.
Seminoe Reservoir level history
This site counts a reservoir as full on a day its storage is at or above 95% of the dam's normal storage (National Inventory of Dams). Many reservoirs rarely reach 100%, even in wet years, because operators release water for irrigation, power or flood control before they fill, so this site treats 95% as full. Highs and lows are daily readings in the published data, not official records. Source: Bureau of Reclamation daily data.
Storage, % of full pool, since 1945
Seminoe Reservoir is falling: 23.8% full, down 0.5 percentage points since September 20, 2026.
On this same date last year (September 28, 2025), Seminoe Reservoir was 37.4% full, 13.6 percentage points higher than today's 23.8%.
Weekly averages of the source's daily readings; older years may be monthly or sparser where that is all the source published. Download the charted data (JSON).
Seminoe Reservoir map
Seminoe Reservoir is at 42.1559, -106.9086. Open in OpenStreetMap.
The dam
- Hydropower
- Irrigation
- Recreation
Sources: nid.sec.usace.army.mil, accessed September 29, 2026
On the water
No campgrounds, boat ramps, or swim spots linked to Seminoe Reservoir yet.
Common questions
- Seminoe Reservoir is at 23.5% of full pool (6294.74 ft) as of September 27, 2026.
- Seminoe Reservoir was last full on July 25, 2010, when it held 95% of its normal storage (elevation 6,354.45 ft). This site counts a reservoir as full on a day its storage is at or above 95% of the dam's normal storage (National Inventory of Dams). Many reservoirs rarely reach 100%, even in wet years, because operators release water for irrigation, power or flood control before they fill, so this site treats 95% as full. Based on Bureau of Reclamation daily data since October 1, 1945.
- In Bureau of Reclamation daily data since October 1, 1945, Seminoe Reservoir's highest elevation was 6,359.29 ft on June 20, 1949. Its lowest after it first filled (July 9, 1947) was 6,253.3 ft on April 20, 1961. These are the highest and lowest daily readings in the published data, not official records.
- Seminoe Reservoir is near Sinclair, Wyoming (42.1559, -106.9086).
- Bureau of Reclamation operates the dam at Seminoe Reservoir.
- Seminoe Reservoir's dam is used for Hydropower, Irrigation, Recreation.