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lakeglance

WashingtonNatural lake, 4,893 acres, King County

Lake Sammamish water level

Lake Sammamish, Washington
Photo: ?ellie? from Shoreline and Olympia, WA, U.S. of A., CC BY 2.0

Current level

25.96ft NGVD29

Reading from Oct 26, 2026

Below normal for October

Past 24 hours
+0.02ft
Past 7 days
0.00ft
Past 30 days
+0.08ft
vs typical October
-0.26ft

Lake Sammamish was at 25.96 ft on October 26, holding steady over the past week (0.00 ft). That is below normal for October: the typical October level is 26.22 ft, so the lake is 0.26 ft below its usual mark.

Last 30 days

25.526.026.5typicalSep 24Oct 9Oct 24

Shaded band shows the lowest and highest October monthly averages on record. Dashed line is the typical October level.

Typical level through the year

Each bar spans the range of monthly averages on record for that month. The line marks the median. The orange dot is where the lake sits now.

2628JFMAMJJASOND

Recent daily readings

Lake Sammamish daily mean water level, newest first
DateLevel (ft NGVD29)Change
Oct 24, 202625.940.00
Oct 23, 202625.94-0.01
Oct 22, 202625.950.00
Oct 21, 202625.950.00
Oct 20, 202625.95-0.01
Oct 19, 202625.960.00
Oct 18, 202625.960.00
Oct 17, 202625.96+0.01
Oct 16, 202625.950.00
Oct 15, 202625.950.00
Oct 14, 202625.950.00
Oct 13, 202625.950.00
Oct 12, 202625.950.00
Oct 11, 202625.95+0.01

Reading these numbers

Readings are elevations in feet above the National Geodetic Vertical Datum of 1929 (NGVD29), the reference most older dam and lake charts use. If you compare with a newer chart in NAVD88, expect a difference of a few feet. Our glossary explains NGVD29 vs NAVD88.

Natural lake levels usually move slowly, following rain, snowmelt and evaporation. A rise after a wet week can flood low docks and beaches, while late-summer lows expose rocks and weed beds near shore.

The gauge is about 3 miles from the center of the lake and is listed by USGS as Sammamish Lake near Redmond, WA. Wind can pile water up at one end of a big lake for a few hours, so short spikes on a windy day are normal.

Lake Sammamish water level questions

What is the water level at Lake Sammamish today?

Lake Sammamish was at 25.96 ft on October 26, holding steady over the past week (0.00 ft). That is below normal for October: the typical October level is 26.22 ft, so the lake is 0.26 ft below its usual mark.

Is Lake Sammamish high or low right now?

Compared with the long-term record for October, the lake is below normal. The October monthly average has ranged from 25.78 to 26.67 ft, with a typical value of 26.22 ft.

Is Lake Sammamish rising or falling?

Over the last seven days the level has held roughly steady (0.00 ft), and it is +0.08 ft compared with 30 days ago.

Where does the Lake Sammamish water level data come from?

From the U.S. Geological Survey, gauge 12122000 (Sammamish Lake near Redmond, WA). USGS publishes provisional readings every 15 to 60 minutes; they can be revised later after quality checks.

How often is this page updated?

The page itself is rebuilt every day with the latest daily values, and the current reading refreshes straight from the USGS each time you open it.

Nearby lakes

If Sammamish is blown out, these are the closest alternatives. Tap through for their water levels.