Reservoir · Washington · United States · BOR RISE
Kachess Lake
Kachess Lake and Dam
32.6% full
Capacity
294.8 hm³
Volume stored
96 hm³
Coordinates
47.265°N, 121.204°W
Last updated
2026-09-30
Current fill
32.6%vs 7 days ago
-3.7%losing
vs 1 year ago
+20.6%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: 2026-09-30.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 47.265, -121.204 · Open in Google Maps
About Kachess Lake
As of September 30, 2026, Kachess Lake is filled to 32.6% of its total capacity, holding roughly 96 hm³ of water out of a maximum 295 hm³. At this level the reservoir is low.
Over the most recent week on record the fill level has fallen by 3.7 percentage points, and it is 20.6 points above its level on the same date a year earlier.
Across the readings we hold for Kachess Lake — 2184 data points between October 2, 2021 and September 30, 2026 — the level has ranged from a low of 8.5% (November 1, 2023) to a high of 99.8% (June 20, 2022). 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 47.265°N, 121.204°W.
Key facts
- Current fill level
- 32.6%
- Water stored
- 96 hm³
- Total capacity
- 295 hm³
- 7-day change
- ▼ 3.7 pts
- Year-on-year
- ▲ 20.6 pts
- Primary use
- Multipurpose
- River basin
- Washington
- Operator
- BOR
- Coordinates
- 47.265°N, 121.204°W
- Last updated
- September 30, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 30 Sep 2026 | 32.6% | 96 |
| 29 Sep 2026 | 33.1% | 98 |
| 25 Sep 2026 | 35.2% | 104 |
| 24 Sep 2026 | 35.8% | 105 |
| 23 Sep 2026 | 36.3% | 107 |
| 22 Sep 2026 | 36.8% | 109 |
| 21 Sep 2026 | 37.4% | 110 |
| 20 Sep 2026 | 37.9% | 112 |
| 19 Sep 2026 | 38.4% | 113 |
| 18 Sep 2026 | 39.1% | 115 |
| 17 Sep 2026 | 39.7% | 117 |
| 16 Sep 2026 | 40.4% | 119 |