WashingtonReservoir, 3,837 acres
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229.00ft
Down 0.15 ft this week
Sailing
CheckingReading the forecast
Kayak and SUP
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Power boating
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Fishing
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Outlook. Monday: SSE wind 0 to 3 kt, gusts to 7 kt, high near 54°F, 74% chance of rain. Tuesday: WSW wind 1 to 3 kt, gusts to 8 kt, high near 54°F, 71% chance of rain.
7-day wind forecastLoads when you scroll here
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Last hour of NOAA MRMS radar, 1 km resolution. Map data © OpenStreetMap contributors, OpenMapTiles, OpenFreeMap.
229.00ft NGVD29
-0.15 ft in 7 days6.44 ft below the October normal
Reading from Oct 26, 2026. Shaded band: range of October averages on record; dashed line is the typical level.
Lake Merwin was at 229.00 ft on October 26, falling 0.15 ft over the past week. That is well below normal for October: the typical October level is 235.44 ft, so the lake is 6.44 ft below its usual mark.
Background reading: Lake Merwin on Wikipedia
Set in Washington, Lake Merwin is a 3,837-acre reservoir.
Water level on this page comes from USGS gauge 14219950 (Lake Merwin near Chelatchie, WA), about 8 mi from the middle of the lake. Wind, gusts and rain come from the National Weather Service forecast grid that covers the water.
Mid-sized lakes like this one tend to have shifty, gusty wind near shore and steadier pressure in the middle, which is why gust spread matters as much as average speed. Reservoir levels move with releases and inflow, so ramps and beaches can change week to week. The water level page tracks that day by day.
The go or no-go calls above are a starting point, not a guarantee. Read how we score conditions, and always check local rules and posted warnings before you launch.
The National Weather Service forecast for the lake from October 26: Monday: SSE wind 0 to 3 kt, gusts to 7 kt, high near 54°F, 74% chance of rain. The panel at the top of this page refreshes the current wind, gusts and direction when you open it and turns them into a call for sailing, paddling, power boating and fishing.
Lake Merwin was at 229.00 ft on October 26, falling 0.15 ft over the past week. That is well below normal for October: the typical October level is 235.44 ft, so the lake is 6.44 ft below its usual mark.
Lake Merwin covers about 3,837 acres (6.0 square miles) of surface water.
If Merwin is blown out, these are the closest alternatives. Tap through for their conditions.