Reservoir · Idaho · United States · BOR RISE
Deadwood Reservoir
Deadwood Reservoir and Dam
45.5% full
Capacity
189.95 hm³
Volume stored
87 hm³
Coordinates
44.293°N, 115.646°W
Last updated
2026-09-10
Current fill
45.5%vs 7 days ago
+0.6%gaining
vs 1 year ago
-0.4%year-over-year
7-day trend
→stable
Data source: BOR RISE — US Bureau of Reclamation — daily reservoir storage volume. Capacity is the design (normal full-pool) capacity from the US National Inventory of Dams (NID); fill % = current volume ÷ design capacity. Last reading: 2026-09-10.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 44.293, -115.646 · Open in Google Maps
About Deadwood Reservoir
As of September 10, 2026, Deadwood Reservoir is filled to 45.5% of its total capacity, holding roughly 87 hm³ of water out of a maximum 190 hm³. At this level the reservoir is within its normal operating range.
Over the most recent week on record the fill level has held broadly steady (+0.6 pts), and it sits close to where it was a year earlier.
Across the readings we hold for Deadwood Reservoir — 2187 data points between September 12, 2021 and September 10, 2026 — the level has ranged from a low of 36.6% (September 16, 2021) to a high of 101.8% (June 30, 2023). On average the reservoir is fullest around June and at its lowest around September.
It is operated by BOR primarily for multiple purposes. It lies within the Idaho basin at 44.293°N, 115.646°W.
Key facts
- Current fill level
- 45.5%
- Water stored
- 87 hm³
- Total capacity
- 190 hm³
- 7-day change
- ▲ 0.6 pts
- Year-on-year
- ▼ 0.4 pts
- Primary use
- Multipurpose
- River basin
- Idaho
- Operator
- BOR
- Coordinates
- 44.293°N, 115.646°W
- Last updated
- September 10, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 10 Sep 2026 | 45.5% | 87 |
| 9 Sep 2026 | 45.5% | 86 |
| 8 Sep 2026 | 45.4% | 86 |
| 7 Sep 2026 | 45.3% | 86 |
| 6 Sep 2026 | 45.3% | 86 |
| 5 Sep 2026 | 45.1% | 86 |
| 4 Sep 2026 | 45.0% | 86 |
| 3 Sep 2026 | 44.9% | 85 |
| 2 Sep 2026 | 44.8% | 85 |
| 1 Sep 2026 | 44.7% | 85 |
| 31 Aug 2026 | 44.6% | 85 |
| 30 Aug 2026 | 44.9% | 85 |