Sammamish Lake water level — Washington
Sammamish Lake in Washington was last measured at 25.72 ft (datum NGVD29), as of Aug 31, 2026, 12:15 AM (UTC-07:00) (USGS Water Services). Over its recent trend window the level has been falling (−0.2 ft). This reading is provisional and subject to revision.
- % of conservation pool full
- Not reported
- Storage
- Not reported
- Recent trend
- ↓Falling
−0.2 ft over the trend window
Recent trend
Readings this station published between Jun 2, 2026 and Aug 31, 2026 — a 89-day window — downsampled for display.
Data: USGS Water Services (waterservices.usgs.gov) and USACE CWMS Data (cwms-data.usace.army.mil), retrieved 2026-08-31. Both public domain (a work of the U.S. Government, 17 U.S.C. §105).
Source: USGS site 12122000, retrieved Aug 31, 2026, 8:24 AM (UTC+00:00). Official page for this lake →
About this gauge's record
This site's drainage basin covers approximately 100 sq mi of contributing watershed.
How Sammamish Lake compares nearby
5 of 6 nearby lakes with a current trend are also falling right now.
Nearby lakes
The six nearest published lakes by centroid distance (great-circle) — cross-state neighbors included.
| Lake | State | Level | Distance |
|---|---|---|---|
| South Fork Tolt Reservoir | WA | 1,735.96 ft | 34 km |
| Lake Tapps | WA | 540.91 ft | 38 km |
| Howard a Hanson Reservoir | WA | 1,153.37 ft | 41 km |
| Mud Mountain Lake | WA | 917.85 ft | 50 km |
| Spada Lake | WA | 1,425.95 ft | 54 km |
| Lake Shannon at Concrete | WA | 410.53 ft | 112 km |
Frequently asked questions
- What is the current water level of Sammamish Lake?
- As of Aug 31, 2026, 12:15 AM (UTC-07:00), the pool elevation was 25.72 ft (datum NGVD29), provisional and subject to revision. See the trend chart above for the recent direction.
- Is Sammamish Lake full right now?
- Its managing agency does not publish a %-of-conservation-pool-full figure for this lake, so we show the bare level rather than estimate one.
- Where does this data come from?
- From USGS site 12122000, retrieved Aug 31, 2026, 8:24 AM (UTC+00:00).
More in Washington
See every lake tracked in Washington, or read the methodology behind these figures.