Reservoir · Washington · United States · USGS NWIS
Wynoochee Lake
42.9% full
Capacity
85.61 hm³
Volume stored
37 hm³
Coordinates
47.385°N, 123.606°W
Last updated
2026-08-12
Current fill
42.9%vs 7 days ago
-2.5%losing
vs 1 year ago
+0.1%year-over-year
7-day trend
↓falling
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: 2026-08-12.
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 August 12, 2026, Wynoochee Lake is filled to 42.9% of its total capacity, holding roughly 37 hm³ of water out of a maximum 86 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 2.5 percentage points, and it sits close to where it was a year earlier.
Across the readings we hold for Wynoochee Lake — 1457 data points between August 14, 2022 and August 12, 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
- 42.9%
- Water stored
- 37 hm³
- Total capacity
- 86 hm³
- 7-day change
- ▼ 2.5 pts
- Year-on-year
- ▲ 0.1 pts
- Primary use
- Multipurpose
- River basin
- Washington
- Operator
- USGS
- Coordinates
- 47.385°N, 123.606°W
- Last updated
- August 12, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 12 Aug 2026 | 42.9% | 37 |
| 11 Aug 2026 | 43.3% | 37 |
| 10 Aug 2026 | 43.6% | 37 |
| 9 Aug 2026 | 44.0% | 38 |
| 8 Aug 2026 | 44.3% | 38 |
| 7 Aug 2026 | 44.7% | 38 |
| 6 Aug 2026 | 45.0% | 39 |
| 5 Aug 2026 | 45.4% | 39 |
| 4 Aug 2026 | 45.7% | 39 |
| 3 Aug 2026 | 46.0% | 39 |
| 2 Aug 2026 | 46.5% | 40 |
| 1 Aug 2026 | 47.0% | 40 |
Frequently asked questions
What is the current water level of Wynoochee Lake?
As of August 12, 2026, Wynoochee Lake is at 42.9% of its capacity, holding approximately 37 hm³ of water, according to USGS NWIS data.
Is Wynoochee Lake reservoir full?
No. As of August 12, 2026, Wynoochee Lake is within its normal operating range at 42.9% of its capacity, so it is not full.
Is the water level at Wynoochee Lake rising or falling?
The level at Wynoochee Lake is falling — it dropped 2.5 percentage points over the latest week on record.
How much water can Wynoochee Lake hold?
Wynoochee Lake has a total capacity of 86 hm³.
Where is Wynoochee Lake reservoir located?
Wynoochee Lake is located in Washington, United States, within the Washington basin (coordinates 47.385°N, 123.606°W).
What is Wynoochee Lake used for?
Wynoochee Lake is used primarily for multiple purposes, and is managed by USGS.