Lake Merwin Water Level Today

Lake Merwin is at 229.0 ft as of 1:00 p.m. PT, Oct 23, according to the U.S. Geological Survey.

229.0 ft

Elevation above sea level

Today, 229.0 ftNormal, 235.0 ft

Last 24 hours

0.00 ft

Last 7 days

−1.00 ft

Last 30 days

−0.52 ft

Compared with normal

6.0 ft below

Updated 1:00 p.m. PT, Oct 23. Source: U.S. Geological Survey. Normal is the median level for Oct 23 from 2017 to 2026. Elevations are in feet above NGVD29.

Lake Merwin level history

30 days1 year

Last 30 days

This yearSame dates last year

Elevation in feet, one reading per day. Source: U.S. Geological Survey.

Common questions

How does today compare with a normal year?

It is 6.0 ft below the median level for Oct 23 across the stored record.

Is Lake Merwin rising or falling?

Falling: it is down 1.00 ft over the last 7 days.

Records

Highest since Sep 2017	239.4 ft	Apr 2019
Lowest since Sep 2017	218.5 ft	Jan 2022
This year's high	238.9 ft	Apr 2026
This year's low	226.0 ft	Mar 2026

Daily levels since September 2017. Source: U.S. Geological Survey.

Lake facts

Dam	Merwin Dam
Normal storage	422,000 acre-ft
Surface area	3,921 acres
County	Cowlitz

Dam facts: U.S. Army Corps of Engineers, National Inventory of Dams.

Other lakes near Lake Merwin

All Washington lakes

Lake	Percent full	Level	Change, 7 days	Updated
Clear Lake, OR	not reported	3,483.7 ft	−0.07 ft	Oct 22
Rimrock Lake	not reported	2,849.9 ft	−0.29 ft	Oct 22
Detroit Lake	not reported	1,487.9 ft	−4.83 ft	2:00 p.m. PT, Oct 23
Kachess Lake	not reported	2,213.8 ft	−0.79 ft	Oct 22
Keechelus Lake	not reported	2,432.9 ft	−0.78 ft	Oct 22
Cle Elum Lake	5.5%	2,122.0 ft	−0.71 ft	Oct 22

Clear Lake, OR3,483.7 ft Rimrock Lake2,849.9 ft Detroit Lake1,487.9 ft Kachess Lake2,213.8 ft Keechelus Lake2,432.9 ft Cle Elum Lake5.5% full

All Washington lakes

LakeLevelToday is not an official warning source. For flood watches and warnings near Lake Merwin, check the National Weather Service.