Reservoir · Washington · United States · BOR RISE
Kachess Lake and Dam (KAC)
73.0% full
Capacity
294.8 hm³
Volume stored
215 hm³
Coordinates
47.265°N, 121.204°W
Last updated
2026-08-01
Current fill
73.0%vs 7 days ago
-0.5%losing
vs 1 year ago
-15.4%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: 2026-08-01.
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 and Dam (KAC)
As of August 1, 2026, Kachess Lake and Dam (KAC) is filled to 73.0% of its total capacity, holding roughly 215 hm³ of water out of a maximum 295 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 (-0.5 pts), and it is 15.4 points below its level on the same date a year earlier.
Across the readings we hold for Kachess Lake and Dam (KAC) — 2187 data points between August 4, 2021 and August 1, 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
- 73.0%
- Water stored
- 215 hm³
- Total capacity
- 295 hm³
- 7-day change
- ▼ 0.5 pts
- Year-on-year
- ▼ 15.4 pts
- Primary use
- Multipurpose
- River basin
- Washington
- Operator
- BOR
- Coordinates
- 47.265°N, 121.204°W
- Last updated
- August 1, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 1 Aug 2026 | 73.0% | 215 |
| 31 Jul 2026 | 73.5% | 217 |
| 30 Jul 2026 | 73.9% | 218 |
| 29 Jul 2026 | 74.5% | 220 |
| 28 Jul 2026 | 75.0% | 221 |
| 27 Jul 2026 | 75.4% | 222 |
| 26 Jul 2026 | 75.9% | 224 |
| 25 Jul 2026 | 76.3% | 225 |
| 24 Jul 2026 | 76.8% | 226 |
| 23 Jul 2026 | 77.2% | 228 |
| 22 Jul 2026 | 77.7% | 229 |
| 21 Jul 2026 | 78.1% | 230 |
Frequently asked questions
What is the current water level of Kachess Lake and Dam (KAC)?
As of August 1, 2026, Kachess Lake and Dam (KAC) is at 73.0% of its capacity, holding approximately 215 hm³ of water, according to BOR RISE (US Bureau of Reclamation) data.
Is Kachess Lake and Dam (KAC) reservoir full?
No. As of August 1, 2026, Kachess Lake and Dam (KAC) is within its normal operating range at 73.0% of its capacity, so it is not full.
Is the water level at Kachess Lake and Dam (KAC) rising or falling?
The level at Kachess Lake and Dam (KAC) has been broadly stable over the latest week on record (-0.5 points).
How much water can Kachess Lake and Dam (KAC) hold?
Kachess Lake and Dam (KAC) has a total capacity of 295 hm³.
Where is Kachess Lake and Dam (KAC) reservoir located?
Kachess Lake and Dam (KAC) is located in Washington, United States, within the Washington basin (coordinates 47.265°N, 121.204°W).
What is Kachess Lake and Dam (KAC) used for?
Kachess Lake and Dam (KAC) is used primarily for multiple purposes, and is managed by BOR.