Reservoir · Washington · United States · BOR RISE
Bumping Lake and Bumping Lake Dam
62.9% full
Capacity
41.57 hm³
Volume stored
26 hm³
Coordinates
46.871°N, 121.299°W
Last updated
2026-08-12
Current fill
62.9%vs 7 days ago
-6.8%losing
vs 1 year ago
-3.6%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: 2026-08-12.
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
As of August 12, 2026, Bumping Lake and Bumping Lake Dam is filled to 62.9% of its total capacity, holding roughly 26 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 fallen by 6.8 percentage points, and it is 3.6 points below its level on the same date a year earlier.
Across the readings we hold for Bumping Lake and Bumping Lake Dam — 2187 data points between August 15, 2021 and August 12, 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
- 62.9%
- Water stored
- 26 hm³
- Total capacity
- 42 hm³
- 7-day change
- ▼ 6.8 pts
- Year-on-year
- ▼ 3.6 pts
- Primary use
- Multipurpose
- River basin
- Washington
- Operator
- BOR
- Coordinates
- 46.871°N, 121.299°W
- Last updated
- August 12, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 12 Aug 2026 | 62.9% | 26 |
| 11 Aug 2026 | 63.8% | 27 |
| 10 Aug 2026 | 64.8% | 27 |
| 9 Aug 2026 | 65.8% | 27 |
| 8 Aug 2026 | 66.7% | 28 |
| 7 Aug 2026 | 67.7% | 28 |
| 6 Aug 2026 | 68.7% | 29 |
| 5 Aug 2026 | 69.7% | 29 |
| 4 Aug 2026 | 70.6% | 29 |
| 3 Aug 2026 | 71.5% | 30 |
| 2 Aug 2026 | 72.5% | 30 |
| 1 Aug 2026 | 73.4% | 31 |
Frequently asked questions
What is the current water level of Bumping Lake and Bumping Lake Dam?
As of August 12, 2026, Bumping Lake and Bumping Lake Dam is at 62.9% of its capacity, holding approximately 26 hm³ of water, according to BOR RISE (US Bureau of Reclamation) data.
Is Bumping Lake and Bumping Lake Dam reservoir full?
No. As of August 12, 2026, Bumping Lake and Bumping Lake Dam is within its normal operating range at 62.9% of its capacity, so it is not full.
Is the water level at Bumping Lake and Bumping Lake Dam rising or falling?
The level at Bumping Lake and Bumping Lake Dam is falling — it dropped 6.8 percentage points over the latest week on record.
How much water can Bumping Lake and Bumping Lake Dam hold?
Bumping Lake and Bumping Lake Dam has a total capacity of 42 hm³.
Where is Bumping Lake and Bumping Lake Dam reservoir located?
Bumping Lake and Bumping Lake Dam 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 used for?
Bumping Lake and Bumping Lake Dam is used primarily for multiple purposes, and is managed by BOR.