Lake Merwin water level today
Lake in Cowlitz County, Washington
At a glance · Oct 23
Lake Merwin is 6.0 ft lower than normal for Oct 23, lower than on this date in 8 of the last 9 years.
- This week↘ Falling 1.00 ft
- Lowest on record↓ 218.52 ft (2022)
Compared with this gauge's own records for the same date. A statistical guide, not advice.
Today compared with past years on Oct 23
Where today's reading sits among this gauge's own records for the same date (±3 days). A statistical guide, not advice.
What this means
It is lower than on Oct 23 in 8 of the last 9 years.
The lake has fallen 1.00 ft in 7 days and fallen 0.52 ft in 30 days.
Since 2017, the lowest daily level was 218.52 ft (Jan 2022) and the highest 239.43 ft (Apr 2019).
Lake Merwin level chart
Loading chart…
2026 compared with 2025
Each year drawn on the same January–December axis, over this gauge's normal range for each date. Hover or tap a point for its value.
Same date in past years
| Date | Level | vs today |
|---|---|---|
| Oct 23, 2025 | 230.04 ft | ▲ 1.04 ft |
| Oct 23, 2024 | 226.92 ft | ▼ 2.08 ft |
| Oct 23, 2023 | 235.23 ft | ▲ 6.23 ft |
| Oct 23, 2022 | 239.00 ft | ▲ 10.00 ft |
| Oct 23, 2021 | 235.00 ft | ▲ 6.00 ft |
| Oct 23, 2020 | 232.00 ft | ▲ 3.00 ft |
| Oct 23, 2019 | 236.10 ft | ▲ 7.10 ft |
| Oct 23, 2018 | 234.08 ft | ▲ 5.08 ft |
| Oct 23, 2017 | 235.46 ft | ▲ 6.46 ft |
Records & details
- Highest
- 239.43 ft on Apr 20, 2019
- Lowest
- 218.52 ft on Jan 25, 2022
- Records from
- 2017 (9 years of daily data)
- Water temperature
- Not measured here
Merwin
- Height
- 313 ft
- Completed
- 1931
- Purposes
- Hydroelectric; Fish and Wildlife Pond; Recreation
- Owner
- Private
- Normal storage
- 422,000 acre-ft
- Surface area
- 3,921 acres
National Inventory of Dams (U.S. Army Corps of Engineers). All dam facts →
Weather & wind
Wind SW 1 mph
Wind SW 3 mph
Wind NNE 2 mph
Wind E 2 mph
Wind ESE 0 to 3 mph
Wind SE 3 mph
NOAA National Weather Service forecast for this lake's location, updated 9 h ago.