Reservoir · Washington · United States · BOR RISE
Bumping Lake and Bumping Lake Dam (BUM)
77.4% full
Capacity
41.57 hm³
Volume stored
32 hm³
Coordinates
46.871°N, 121.299°W
Last updated
2026-07-28
Current fill
77.4%vs 7 days ago
-1.0%losing
vs 1 year ago
-22.0%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: 2026-07-28.
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 and Bumping Lake Dam (BUM)
As of July 28, 2026, Bumping Lake and Bumping Lake Dam (BUM) is filled to 77.4% of its total capacity, holding roughly 32 hm³ of water out of a maximum 42 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 (-1.0 pts), and it is 22.0 points below its level on the same date a year earlier.
Across the readings we hold for Bumping Lake and Bumping Lake Dam (BUM) — 2187 data points between July 31, 2021 and July 28, 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
- 77.4%
- Water stored
- 32 hm³
- Total capacity
- 42 hm³
- 7-day change
- ▼ 1.0 pts
- Year-on-year
- ▼ 22.0 pts
- Primary use
- Multipurpose
- River basin
- Washington
- Operator
- BOR
- Coordinates
- 46.871°N, 121.299°W
- Last updated
- July 28, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 28 Jul 2026 | 77.4% | 32 |
| 27 Jul 2026 | 78.4% | 33 |
| 26 Jul 2026 | 79.3% | 33 |
| 25 Jul 2026 | 80.3% | 33 |
| 24 Jul 2026 | 81.2% | 34 |
| 23 Jul 2026 | 82.1% | 34 |
| 22 Jul 2026 | 82.7% | 34 |
| 21 Jul 2026 | 83.4% | 35 |
| 20 Jul 2026 | 84.1% | 35 |
| 19 Jul 2026 | 84.9% | 35 |
| 18 Jul 2026 | 85.7% | 36 |
| 17 Jul 2026 | 86.5% | 36 |
Frequently asked questions
What is the current water level of Bumping Lake and Bumping Lake Dam (BUM)?
As of July 28, 2026, Bumping Lake and Bumping Lake Dam (BUM) is at 77.4% of its capacity, holding approximately 32 hm³ of water, according to BOR RISE (US Bureau of Reclamation) data.
Is Bumping Lake and Bumping Lake Dam (BUM) reservoir full?
No. As of July 28, 2026, Bumping Lake and Bumping Lake Dam (BUM) is within its normal operating range at 77.4% of its capacity, so it is not full.
Is the water level at Bumping Lake and Bumping Lake Dam (BUM) rising or falling?
The level at Bumping Lake and Bumping Lake Dam (BUM) has been broadly stable over the latest week on record (-1.0 points).
How much water can Bumping Lake and Bumping Lake Dam (BUM) hold?
Bumping Lake and Bumping Lake Dam (BUM) has a total capacity of 42 hm³.
Where is Bumping Lake and Bumping Lake Dam (BUM) reservoir located?
Bumping Lake and Bumping Lake Dam (BUM) is located in Washington, United States, within the Washington basin (coordinates 46.871°N, 121.299°W).
What is Bumping Lake and Bumping Lake Dam (BUM) used for?
Bumping Lake and Bumping Lake Dam (BUM) is used primarily for multiple purposes, and is managed by BOR.