Reservoir · Washington · United States · USGS NWIS
Wynoochee Lake
27.1% full
Capacity
85.61 hm³
Volume stored
23 hm³
Coordinates
47.385°N, 123.606°W
Last updated
2026-09-30
Current fill
27.1%vs 7 days ago
-1.5%losing
vs 1 year ago
-0.5%year-over-year
7-day trend
→stable
Data source: USGS National Water Information System (NWIS) — 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. 47.385, -123.606 · Open in Google Maps
About Wynoochee Lake
As of September 30, 2026, Wynoochee Lake is filled to 27.1% of its total capacity, holding roughly 23 hm³ of water out of a maximum 86 hm³. At this level the reservoir is low.
Over the most recent week on record the fill level has held broadly steady (-1.5 pts), and it sits close to where it was a year earlier.
Across the readings we hold for Wynoochee Lake — 1458 data points between October 1, 2022 and September 30, 2026 — the level has ranged from a low of 26.5% (October 23, 2025) to a high of 99.8% (June 11, 2024). On average the reservoir is fullest around May and at its lowest around October.
It is operated by USGS primarily for multiple purposes. It lies within the Washington basin at 47.385°N, 123.606°W.
Key facts
- Current fill level
- 27.1%
- Water stored
- 23 hm³
- Total capacity
- 86 hm³
- 7-day change
- ▼ 1.5 pts
- Year-on-year
- ▼ 0.5 pts
- Primary use
- Multipurpose
- River basin
- Washington
- Operator
- USGS
- Coordinates
- 47.385°N, 123.606°W
- Last updated
- September 30, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 30 Sep 2026 | 27.1% | 23 |
| 29 Sep 2026 | 27.5% | 24 |
| 28 Sep 2026 | 27.6% | 24 |
| 27 Sep 2026 | 27.8% | 24 |
| 26 Sep 2026 | 28.1% | 24 |
| 25 Sep 2026 | 28.3% | 24 |
| 24 Sep 2026 | 28.3% | 24 |
| 23 Sep 2026 | 28.6% | 25 |
| 22 Sep 2026 | 29.0% | 25 |
| 21 Sep 2026 | 29.3% | 25 |
| 20 Sep 2026 | 29.7% | 25 |
| 19 Sep 2026 | 30.0% | 26 |