Reservoir · Oregon · United States · BOR RISE
Fourmile Lake
Fourmile Lake and Fourmile Lake Dam
7.1% full
Capacity
19.24 hm³
Volume stored
1 hm³
Coordinates
42.456°N, 122.243°W
Last updated
2026-09-30
Current fill
7.1%vs 7 days ago
0.0%stable
vs 1 year ago
-1.7%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: 2026-09-30.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 42.456, -122.243 · Open in Google Maps
About Fourmile Lake
As of September 30, 2026, Fourmile Lake is filled to 7.1% of its total capacity, holding roughly 1 hm³ of water out of a maximum 19 hm³. At this level the reservoir is critically low.
Over the most recent week on record the fill level has held broadly steady (+0.0 pts), and it is 1.7 points below its level on the same date a year earlier.
Across the readings we hold for Fourmile Lake — 2186 data points between October 2, 2021 and September 30, 2026 — the level has ranged from a low of 6.9% (June 15, 2026) to a high of 83.5% (June 10, 2025). 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 Oregon basin at 42.456°N, 122.243°W.
Key facts
- Current fill level
- 7.1%
- Water stored
- 1 hm³
- Total capacity
- 19 hm³
- 7-day change
- No change
- Year-on-year
- ▼ 1.7 pts
- Primary use
- Multipurpose
- River basin
- Oregon
- Operator
- BOR
- Coordinates
- 42.456°N, 122.243°W
- Last updated
- September 30, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 30 Sep 2026 | 7.1% | 1 |
| 29 Sep 2026 | 7.1% | 1 |
| 28 Sep 2026 | 7.1% | 1 |
| 27 Sep 2026 | 7.1% | 1 |
| 26 Sep 2026 | 7.1% | 1 |
| 25 Sep 2026 | 7.1% | 1 |
| 24 Sep 2026 | 7.1% | 1 |
| 23 Sep 2026 | 7.1% | 1 |
| 22 Sep 2026 | 7.1% | 1 |
| 21 Sep 2026 | 7.1% | 1 |
| 20 Sep 2026 | 7.1% | 1 |
| 19 Sep 2026 | 7.1% | 1 |