Wynoochee Lake water level
▼ 1.7 points from 28.8% a year ago
Source: waterdata.usgs.gov/monitoring-location/USGS-12035380, accessed October 1, 2026. Updated every 6 hours.
Wynoochee Lake is at 27.6% of full pool as of September 29, 2026. Wynoochee Lake was last full on July 3, 2024 (95.2% of normal storage). Wynoochee Lake is near Grisdale, Washington.
Wynoochee Lake level history
This site counts a reservoir as full on a day its storage is at or above 95% of the dam's normal storage (National Inventory of Dams). Many reservoirs rarely reach 100%, even in wet years, because operators release water for irrigation, power or flood control before they fill, so this site treats 95% as full. Highs and lows are daily readings in the published data, not official records. Source: USGS daily data.
Storage, % of full pool, since 2015
Wynoochee Lake is falling: 27.6% full, down 0.9 percentage points since September 27, 2026.
On this same date last year (September 28, 2025), Wynoochee Lake was 28.8% full, 1.2 percentage points higher than today's 27.6%.
Weekly averages of the source's daily readings; older years may be monthly or sparser where that is all the source published. Download the charted data (JSON).
Wynoochee Lake map
Wynoochee Lake is at 47.3853, -123.6057. Open in OpenStreetMap.
The dam
- Flood control
- Hydropower
- Recreation
- Water supply
Sources: nid.sec.usace.army.mil, accessed September 29, 2026
On the water
No campgrounds, boat ramps, or swim spots linked to Wynoochee Lake yet.
Common questions
- Wynoochee Lake is at 27.6% of full pool as of September 29, 2026.
- Wynoochee Lake was last full on July 3, 2024, when it held 95.2% of its normal storage. This site counts a reservoir as full on a day its storage is at or above 95% of the dam's normal storage (National Inventory of Dams). Many reservoirs rarely reach 100%, even in wet years, because operators release water for irrigation, power or flood control before they fill, so this site treats 95% as full. Based on USGS daily data since October 1, 2015.
- In USGS daily data since October 1, 2015, Wynoochee Lake's highest storage was 99.8% of normal storage on June 21, 2022. Its lowest after it first filled (May 7, 2017) was 26.2% of normal storage on October 15, 2019. These are the highest and lowest daily readings in the published data, not official records.
- Wynoochee Lake is near Grisdale, Washington (47.3853, -123.6057).
- Local Government operates the dam at Wynoochee Lake.
- Wynoochee Lake's dam is used for Flood control, Hydropower, Recreation, Water supply.