Lake Merwin near Chelatchie water level

Name: Lake Merwin near Chelatchie water level (U.S. Geological Survey)
Creator: U.S. Geological Survey
License: https://www.usgs.gov/information-policies-and-instructions/copyrights-and-credits

Lake, Lake Merwin, Washington, United States

Directions

Very low for mid-October

Surface elevation

229.00ft Down 1.00 ft over the last 24 hours

Measured Oct 18, 2026, 12:00 PM PDT (43 min ago)

History

What this means

Lake Merwin near Chelatchie is far below normal for mid-October, with the lake level at 229.00 ft.

That puts it 6.00 ft below the median of 235.00 ft for mid-October, based on 7 years of readings. A year ago it stood at 230.00 ft (−1.00 ft).

It has dropped 1.00 ft over the past 24 hours. With the water still dropping, the shoreline keeps moving out. In the last month it has stayed between 229.00 ft and 231.00 ft.

Lakes and reservoirs often sit lower in fall after a summer of evaporation and use, and recover with winter rain and spring snowmelt.

Compared with 7 years of daily readings for this time of year. How to read levels

Key numbers

Median for this date: 235.00 ft6.00 ft below the median for this date
Normal for this date: 230.00 ft – 238.00 ft8 years in 10 fall in this range (7 years of records)
Same day last year: 230.00 ft−1.00 ft
Lowest and highest in 30 days: 229.00 ft – 231.00 ft
Lowest and highest in 12 months: 222.00 ft – 238.92 ft

On the water at Lake Merwin near Chelatchie

A receding shoreline opens up beaches but also uncovers hazards: stumps, rocks and soft mud that are usually well under water.

Wear a life jacket on the water. Most boating deaths involve people who were not wearing one.

Weather at the gauge

No rain in the last 3 days.

18 Sun 71° 43° – Wind 7 mph

19 Mon 62° 47° – Wind 5 mph

20 Tue 74° 48° – Wind 8 mph

21 Wed 80° 50° – Wind 7 mph

22 Thu 64° 42° – Wind 9 mph

23 Fri 58° 38° – Wind 5 mph

24 Sat 65° 41° – Wind 5 mph

Forecast: Open-Meteo

Sunrise 07:31 AM Sunset 06:20 PM Daylight 10 hr, 49 min First quarter 52%

Map

Nearby gauges

Gauge	Level	Compared with normal	24 hours	Distance
Speelyai Creek near CougarRiver gauge, Speelyai Creek	1.6 cfs	Very low	+0.1 cfs	3.0 mi
Canyon Creek near AmboyRiver gauge, Canyon Creek	24.0 cfs	Low	−0.7 cfs	3.9 mi
Yale Reservoir near CougarReservoir, Yale Reservoir	473.00 ft	Normal	+1.00 ft	5.5 mi
Lewis River at ArielRiver gauge, Lewis River	2.45 ft	Very low	±0	9 mi
East Fork Lewis River near HeissonRiver gauge, East Fork Lewis River	10.08 ft	Very low	+0.05 ft	10 mi
Swift Reservoir 3.2 Mi East of Dam near CougarReservoir, Swift Reservoir 3.2 Mi East of Dam	959.00 ft	Normal	±0	14 mi
Muddy River below Clear Creek near CougarRiver gauge, Muddy River	13.76 ft	Very low	±0	20 mi
Lewis River above Muddy River near CougarRiver gauge, Lewis River	164 cfs	Very low	±0	20 mi

Questions and answers

How does Lake Merwin near Chelatchie compare with last year?

It is 1.00 ft lower than on the same day last year, when the reading was 230.00 ft.

What is a normal level for Lake Merwin near Chelatchie in mid-October?

The median for mid-October is 235.00 ft. In 8 years out of 10 the reading falls between 230.00 ft and 238.00 ft, based on 7 years of records.

Is Lake Merwin near Chelatchie really 229.00 ft deep?

No. 229.00 ft is the height of the water surface above sea level (or the agency's vertical datum), not the depth of the water.

What is the water level of Lake Merwin near Chelatchie today?

On Oct 18, 2026, 12:00 PM PDT, the surface elevation was 229.00 ft. Down 1.00 ft over the last 24 hours.

Is Lake Merwin near Chelatchie rising or falling?

Down 1.00 ft over the last 24 hours. Down 0.79 ft over the last 7 days.

Is the level of Lake Merwin near Chelatchie normal?

Very low for mid-October. Compared with 7 years of daily readings for this time of year.

How often is this data updated?

The U.S. Geological Survey publishes a new reading every 15 minutes. This page refreshes within minutes of each update.

For specialists

Station codes, datum, parameters, data quality and downloads

Operator: U.S. Geological Survey
Station code: usgs:14219950 (Agency page)
Coordinates: 45.97118, -122.38507 (WGS84)
Vertical datum: NGVD29
Update interval: every 15 minutes
Licence: Public domain. Data: U.S. Geological Survey (USGS), provisional data subject to revision

Published series

Parameter	Last value	Time (UTC)	Quality
Surface elevation	229.00 ft	2026-10-18 19:00	Provisional

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How to cite

U.S. Geological Survey: Lake Merwin near Chelatchie (usgs:14219950). Accessed October 18, 2026 via Nivelmap, https://nivelmap.com/en/united-states/washington/lake-merwin-near-chelatchie

How we check values

Each reading is stored as published. We hold back values that jump faster than physically plausible and show the measurement time with every value.

Readings are provisional, can be delayed or wrong and are not a flood warning. Read the disclaimer