Sammamish Lake

Name: Sammamish Lake (Washington) water level
Creator: U.S. Geological Survey

near Redmond, WA · Washington · USGS gauge

Grey bar: recent range 25.7–26.0 ft.

Water level · NGVD29

25.94FT

Gauge elevation · no % full published

7 days −0.01 ft30 days +0.20 ftvs last year +0.06 ft

Reading for Oct 25, 2026, 18:15 UTC · page refreshed Oct 25, 21:53 UTC
Source: U.S. Geological Survey (Water Data for the Nation)

Worth going today?Today

Windy or wet – use caution

Light wind, 64% chance of rain

Wind2 mph

Rain64%

Temp55°F

Level25.9 ft

TodayLight Rain Likely · 55°F
SE 2 mph · rain 64%

TonightChance Light Rain · 45°F
E 1 mph · rain 41%

NWS forecast for the gauge location. Good = wind ≤ 10 mph and rain ≤ 30%; storms are flagged. Not safety advice – check local conditions, closures and warnings.

Level history

Last 30 days of daily means.

Field notes

Sammamish Lake's latest daily level (Oct 25, 2026) is 25.94 (NGVD29) ft.

The level has been roughly steady over the past week (−0.01 ft).

Compared with a year ago (25.88 ft, same time of day), the lake is 0.06 ft higher.

Readings come from the USGS gauge “SAMMAMISH LAKE NEAR REDMOND, WA”. Gauge elevations are not directly comparable between lakes because each uses its own datum.

Lake facts

Gauge / station	SAMMAMISH LAKE NEAR REDMOND, WA
Elevation datum	ft (NGVD29)
Gauge location	47.5765, -122.1112

Nearby lakes

South Fork Tolt Reservoir21 mi NE1,719.77 ft−2.72 ft Lake Tapps23 mi S539.14 ft−0.23 ft Howard A Hanson Reservoir26 mi SE1,122.17 ft−7.31 ft Mud Mountain Lake31 mi S915.76 ft−0.36 ft Spada Lake34 mi NE1,400.16 ft−3.32 ft

Common questions

Is Sammamish Lake rising or falling?

Over the last 7 days it changed −0.01 ft and over 30 days +0.20 ft.

How full is Sammamish Lake?

USGS publishes the water surface elevation for this gauge but not a percent-full figure, so we don't show one rather than estimate it.

How often is this page updated?

The page is rebuilt automatically every day from USGS's published data. Values can be revised later by the source agency.

Where does the data come from?

The U.S. Geological Survey's Water Data API (api.waterdata.usgs.gov), which publishes readings from USGS and partner gauges. Forecasts come from the National Weather Service.

Latest instantaneous reading; 7-day, 30-day and year-ago changes compare readings at the same hour. USGS data are provisional and subject to revision. This page is not affiliated with or endorsed by the USGS. See data sources.