What is the current water level of Lake Merwin?

As of Aug 31, 2026, 1:00 AM (UTC-07:00), the pool elevation was 235.00 ft (datum NGVD29), provisional and subject to revision. See the trend chart above for the recent direction.

Is Lake Merwin full right now?

Its managing agency does not publish a %-of-conservation-pool-full figure for this lake, so we show the bare level rather than estimate one.

Lake Merwin water level — Washington

Washington · USGS · reading Aug 31, 2026, 1:00 AM (UTC-07:00) Provisional

Lake Merwin in Washington was last measured at 235.00 ft (datum NGVD29), as of Aug 31, 2026, 1:00 AM (UTC-07:00) (USGS Water Services). Over its recent trend window the level has been steady (0.0 ft). This reading is provisional and subject to revision.

Current reading Lake Merwin · Washington

Pool elevation: 235.00 ft
% of conservation pool full: Not reported
Storage: Not reported
Recent trend: →Steady

Recent trend

Readings this station published between Jun 2, 2026 and Aug 31, 2026 — a 89-day window — downsampled for display.

Data: USGS Water Services (waterservices.usgs.gov) and USACE CWMS Data (cwms-data.usace.army.mil), retrieved 2026-08-31. Both public domain (a work of the U.S. Government, 17 U.S.C. §105).

Not for navigation or safety decisions (why →)

Source: USGS site 14219950, retrieved Aug 31, 2026, 8:24 AM (UTC+00:00). Official page for this lake →

How Lake Merwin compares nearby

2 of 6 nearby lakes with a current trend are also steady right now.

Nearby lakes

The six nearest published lakes by centroid distance (great-circle) — cross-state neighbors included.

Lakes nearest to Lake Merwin, with current level and distance.
Lake	State	Level	Distance
Yale Reservoir	WA	474.00 ft	9 km
Swift Reservoir 3.2 Mi East of Dam	WA	966.00 ft	22 km
Castle Lake	WA	2,577.54 ft	33 km
Spirit Lake West at Spirit Lake	WA	3,441.68 ft	37 km
Spirit Lake at Tunnel at Spirit Lake	WA	3,400.49 ft	38 km
Bull Run Reservoir No 1	OR	1,010.92 ft	59 km

Frequently asked questions

What is the current water level of Lake Merwin?: As of Aug 31, 2026, 1:00 AM (UTC-07:00), the pool elevation was 235.00 ft (datum NGVD29), provisional and subject to revision. See the trend chart above for the recent direction.
Is Lake Merwin full right now?: Its managing agency does not publish a %-of-conservation-pool-full figure for this lake, so we show the bare level rather than estimate one.
Where does this data come from?: From USGS site 14219950, retrieved Aug 31, 2026, 8:24 AM (UTC+00:00).

More in Washington

See every lake tracked in Washington, or read the methodology behind these figures.