CountiesKing County
WashingtonNatural lakeKing County
Lake Sammamish
Lake Sammamish is a lake of some 4,893 acres on the Sammamish River, in Washington. It lies in King County. Washington State Parks manages it. The gauge last read 25.71 ft.
Water level today: 25.71 ft · see the full record
Coordinates47.6164, -122.0894
Surface area4,893 acres
Max depth115 ft
RiverSammamish River
Managed byWashington State Parks
Swimming beaches on Lake Sammamish
2 named swimming spots and shoreline access points, from USGS GNIS, Recreation.gov and the Forest Service. None is staffed by a lifeguard unless the operating agency posts one.
Lake Sammamish on the map
Lake center, swimming spots and access points.
Weather and water temperature
Air temperature and wind from Open-Meteo. Water temperature only when the lake has a public sensor.
Weather data by Open-Meteo
Water level today
The level comes from gauge 12122000, SAMMAMISH LAKE NEAR REDMOND, WA, and carries the time it was taken. The last value stored here, 25.71 ft, is from 2026-09-09. Over the record shown on the level page the gauge has moved between 25.61 ft and 29.00 ft (low on 2025-09-20, high on 2025-12-18). A low pool exposes stumps and mud in the shallow arms of the lake.
25.71 ft -0.01 ft in 7 days
Swimming at Lake Sammamish
Its coordinates are 47.6164, -122.0894. It reaches roughly 115 feet at its deepest. Surface elevation is about 30 feet.
The closest lakes in this guide are Lake Washington (Washington, 8 mi), Lake Tapps (Washington, 26 mi) and Keechelus Lake (Washington, 38 mi). Washington has 45 lakes on this site in total.
No public sensor reports water temperature at Lake Sammamish, so the panel shows air temperature and wind. Swimming season in Washington runs through the warm months, and day-use areas set their own opening dates. If the water looks like pea soup or paint, stay out and report it to the managing agency.
The level comes from gauge 12122000, SAMMAMISH LAKE NEAR REDMOND, WA, and carries the time it was taken. The last value stored here, 25.71 ft, is from 2026-09-09. Over the record shown on the level page the gauge has moved between 25.61 ft and 29.00 ft (low on 2025-09-20, high on 2025-12-18). A low pool exposes stumps and mud in the shallow arms of the lake.
Public access at Lake Sammamish covers 2 named swimming spots. These come from USGS GNIS. Rosemont Beach and Alexander Beach are on the list. None is staffed by a lifeguard unless the managing agency posts one.
Questions about Lake Sammamish
Can you swim in Lake Sammamish?
Yes. This guide maps 2 named swimming spots around the lake, including Rosemont Beach and Alexander Beach. None is staffed by a lifeguard unless the operating agency posts one.
How big is Lake Sammamish?
About 4,893 acres. Maximum depth is around 115 feet.
What other lakes are near Lake Sammamish?
The closest in this guide is Lake Washington, about 8 miles away in Washington.
Lakes near Lake Sammamish
Other lakes in this guide, ordered by distance.
Lake Washington
Lake Washington is a lake of some 21,745 acres on the Lake Washington Ship Canal, in Washington. The lake is in King County. It…
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Lake Tapps
Lake Tapps is a 2,434-acre reservoir on the outflow = in Washington. You will find it in Pierce County. Cascade Water Alliance…
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Kachess Lake
Kachess Lake covers about 4,540 acres of the Kachess River in Washington. The lake is in Kittitas County. It is managed by US…
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Cle Elum Lake
Fed by the Cle Elum River, Cle Elum Lake holds roughly 4,566 acres of water in Washington. You will find it in Kittitas County.…
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Lake Cushman
Fed by the North Fork Skokomish River, Lake Cushman holds roughly 4,015 acres of water in Washington. Its shoreline falls inside…
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Lake Wenatchee
Fed by the Wenatchee River, Lake Wenatchee holds roughly 2,481 acres of water in Washington. It lies in Chelan County. It is…
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Explore around Washington
All lakes in Washington Swimming spots in Washington Lakes near Sammamish Lakes near Bellevue
Sources
Every figure on this page comes from one of these public sources.