Reservoir · Idaho · United States · BOR RISE
Little Wood River Reservoir
Little Wood River Reservoir and Dam
21.8% full
Capacity
37 hm³
Volume stored
8 hm³
Coordinates
43.425°N, 114.027°W
Last updated
2026-09-30
Current fill
21.8%vs 7 days ago
-1.9%losing
vs 1 year ago
+12.5%year-over-year
7-day trend
↓falling
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: 2026-09-30.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 43.425, -114.027 · Open in Google Maps
About Little Wood River Reservoir
As of September 30, 2026, Little Wood River Reservoir is filled to 21.8% of its total capacity, holding roughly 8 hm³ of water out of a maximum 37 hm³. At this level the reservoir is low.
Over the most recent week on record the fill level has fallen by 1.9 percentage points, and it is 12.5 points above its level on the same date a year earlier.
Across the readings we hold for Little Wood River Reservoir — 2188 data points between October 2, 2021 and September 30, 2026 — the level has ranged from a low of 3.0% (October 2, 2021) to a high of 99.3% (July 1, 2023). On average the reservoir is fullest around June and at its lowest around October.
It is operated by BOR primarily for multiple purposes. It lies within the Idaho basin at 43.425°N, 114.027°W.
Key facts
- Current fill level
- 21.8%
- Water stored
- 8 hm³
- Total capacity
- 37 hm³
- 7-day change
- ▼ 1.9 pts
- Year-on-year
- ▲ 12.5 pts
- Primary use
- Multipurpose
- River basin
- Idaho
- Operator
- BOR
- Coordinates
- 43.425°N, 114.027°W
- Last updated
- September 30, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 30 Sep 2026 | 21.8% | 8 |
| 29 Sep 2026 | 22.0% | 8 |
| 28 Sep 2026 | 22.3% | 8 |
| 27 Sep 2026 | 22.6% | 8 |
| 26 Sep 2026 | 22.8% | 8 |
| 25 Sep 2026 | 23.1% | 9 |
| 24 Sep 2026 | 23.4% | 9 |
| 23 Sep 2026 | 23.7% | 9 |
| 22 Sep 2026 | 23.9% | 9 |
| 21 Sep 2026 | 24.2% | 9 |
| 20 Sep 2026 | 24.5% | 9 |
| 19 Sep 2026 | 24.7% | 9 |