Reservoir · Washington · United States · BOR RISE
Bumping Lake
Bumping Lake and Bumping Lake Dam
26.4% full
Capacity
41.57 hm³
Volume stored
11 hm³
Coordinates
46.871°N, 121.299°W
Last updated
2026-09-30
Current fill
26.4%vs 7 days ago
-4.0%losing
vs 1 year ago
+4.8%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. 46.871, -121.299 · Open in Google Maps
About Bumping Lake
As of September 30, 2026, Bumping Lake is filled to 26.4% of its total capacity, holding roughly 11 hm³ of water out of a maximum 42 hm³. At this level the reservoir is low.
Over the most recent week on record the fill level has fallen by 4.0 percentage points, and it is 4.8 points above its level on the same date a year earlier.
Across the readings we hold for Bumping Lake — 2188 data points between October 2, 2021 and September 30, 2026 — the level has ranged from a low of 11.0% (November 10, 2024) to a high of 105.0% (December 17, 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 Washington basin at 46.871°N, 121.299°W.
Key facts
- Current fill level
- 26.4%
- Water stored
- 11 hm³
- Total capacity
- 42 hm³
- 7-day change
- ▼ 4.0 pts
- Year-on-year
- ▲ 4.8 pts
- Primary use
- Multipurpose
- River basin
- Washington
- Operator
- BOR
- Coordinates
- 46.871°N, 121.299°W
- Last updated
- September 30, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 30 Sep 2026 | 26.4% | 11 |
| 29 Sep 2026 | 27.0% | 11 |
| 28 Sep 2026 | 27.6% | 11 |
| 27 Sep 2026 | 28.1% | 12 |
| 26 Sep 2026 | 28.7% | 12 |
| 25 Sep 2026 | 29.3% | 12 |
| 24 Sep 2026 | 29.8% | 12 |
| 23 Sep 2026 | 30.4% | 13 |
| 22 Sep 2026 | 31.0% | 13 |
| 21 Sep 2026 | 31.7% | 13 |
| 20 Sep 2026 | 32.3% | 13 |
| 19 Sep 2026 | 33.0% | 14 |