Lake Merwin Water Level
USGS gauge 14219950 · near Chelatchie, WA
Latest reading Oct 26, 9:00 AM · elevation
Lake Merwin is at 229.00 ft today, 2.0 ft lower than a year ago. It has fallen 1.00 ft since yesterday and is down 0.00 ft over 7 days.
Water level chart
ft above sea levelReading
Lake Merwin fishing report & conditions
updated Oct 26, 12:50 PM ETLevel falling, calm wind — fair fall fishing day (5/10), best window 8:06 AM–9:06 AM (moonset near sunrise).
- Water temp—no water-temperature sensor on this water yet
- Air temphigh 54°F / low 44°FRain Showers
- WindCalm0–2 mph 6 AM–6 PM, gusts to 6
- Level229.00 ftLevel falling 1.00 ft in 24 h
Official Washington fishing report: Washington Department of Fish & Wildlife — Fishing and stocking reports
Best fishing times today
Today is a fair fishing day (solunar + local conditions)
5/10
Full moon · 99% lit · New moon Sun, Nov 8 · Sunrise 7:42 AM · Sunset 6:04 PM
Major fishing times
- Moon underfoot12:23 PM–2:23 PM
Minor fishing times
- Moonset8:06 AM–9:06 AMSunrise
- Moonrise5:30 PM–6:30 PMSunset
Fishing times for the next 7 days
| TodayOct 26 | 5/10Fair | Major 12:23 PM–2:23 PM Minor 8:06 AM–9:06 AM · 5:30 PM–6:30 PM Calm wind 0–2 mph |
|---|---|---|
| TueOct 27 | 4/10Fair | Major 12:51 AM–2:51 AM · 1:22 PM–3:22 PM Minor 9:29 AM–10:29 AM · 6:07 PM–7:07 PM Calm wind 0–4 mph |
| WedOct 28 | 3/10Poor | Major 1:53 AM–3:53 AM · 2:24 PM–4:24 PM Minor 10:49 AM–11:49 AM · 6:56 PM–7:56 PM Calm wind 1–5 mph |
| ThuOct 29 | 4/10Fair | Major 2:57 AM–4:57 AM · 3:29 PM–5:29 PM Minor 12:00 PM–1:00 PM · 8:00 PM–9:00 PM Calm wind 1–4 mph |
| FriOct 30 | 3/10Poor | Major 4:01 AM–6:01 AM · 4:33 PM–6:33 PM Minor 12:56 PM–1:56 PM · 9:14 PM–10:14 PM Calm wind 0–2 mph |
| SatOct 31 | 4/10Fair | Major 5:03 AM–7:03 AM · 5:32 PM–7:32 PM Minor 1:38 PM–2:38 PM · 10:34 PM–11:34 PM Calm wind 0–4 mph |
| SunNov 1 | 4/10Fair | Major 5:00 AM–7:00 AM · 5:27 PM–7:27 PM Minor 1:10 PM–2:10 PM · 10:54 PM–11:54 PM Calm wind 0–2 mph |
How this rating works
Solunar theory says fish feed more when the moon is overhead or underfoot (major periods, about 2 hours) and around moonrise and moonset (minor periods, about 1 hour). On a lake or river there is no tide, so instead of tide changes we score the local conditions anglers watch: the barometric pressure trend, the wind, whether the lake level is steady, and the water temperature where it is measured.
| Base | every day starts at 1 | 1 |
|---|---|---|
| Sunrise / sunset | a period overlaps sunrise or sunset ±1 h: major +2, minor +1 (max 3) (Moonset × sunrise +1; Moonrise × sunset +1) | 2 |
| Moon phase | within 2 days of a new or full moon +2, within 4 days +1 (today: 0.5 days) | 2 |
| Local conditions | pressure 6 AM→6 PM: falling +2, steady or slowly rising +1, rising fast 0 · daytime wind 4–15 mph +1, over 20 mph (or gusts over 30) −1 · level within ±0.25 ft in 24 h +1 · water 55–75°F +1, below 45°F or above 85°F −1 (0 to 4 in total)
| 0 |
| Today | 5, rounded | 5/10 |
1–3 poor · 4–5 fair · 6–7 good · 8–10 excellent. Pressure and wind are the NOAA National Weather Service hourly forecast for this spot; the level/flow trend is the latest 24 hours of readings on this page. Days 2–7 score sun, moon, forecast pressure and forecast wind only (level and water temperature aren’t forecast). Solunar times are a rule of thumb, not a guarantee.
Solunar periods calculated for 45.97, -122.39 (moon times from astronomical equations, Lake Merwin local time).
Weather & wind at Lake Merwin
air temperature, not water3-day forecast
- Today54° / 44°Rain ShowersWind SSE 1 mphRain 80%
- Tuesday54° / 42°Areas Of Fog then Rain ShowersWind W 0 to 3 mphRain 100%
- Wednesday51° / 39°Rain ShowersWind SSW 1 to 5 mphRain 100%
NOAA National Weather Service forecast for 45.971, -122.385 (grid PQR), issued Oct 26, 9:41 AM local time. High / low are air temperatures; water temperature is in the fishing section above. The “Air temp & weather” tile at the top refreshes live.
Past 12 months
daily readings from the operator- Today229.00 ft
- Same date last year231.00 ft−2.0 ft change
- 12-month high238.92 ftApr 27, 2026
- 12-month low222.00 ftDec 15, 2025
Last 10 days
| Date | Level (ft) | Change |
|---|---|---|
| Sun Oct 25 | 229.69 | +0.13 |
| Sat Oct 24 | 229.56 | +0.73 |
| Fri Oct 23 | 228.83 | +0.08 |
| Thu Oct 22 | 228.75 | −0.23 |
| Wed Oct 21 | 228.98 | +0.79 |
| Tue Oct 20 | 228.19 | −0.96 |
| Mon Oct 19 | 229.15 | +0.05 |
| Sun Oct 18 | 229.10 | −0.38 |
| Sat Oct 17 | 229.48 | −0.52 |
| Fri Oct 16 | 230.00 | ±0.00 |
Daily mean of all readings that day; today is the average so far.
Nearby lakes & rivers
- Yale Reservoir5 mi · Lake · Cougar471.00 ft24h ±0.00 ft
- Swift Reservoir 3.2 Mi East of Dam14 mi · Lake · Cougar952.00 ft24h ±0.00 ft
- Castle Lake20 mi · Lake · Mount St. Helens2,577.73 ft24h +0.06 ft
- Spirit Lake24 mi · Lake · Tunnel at Spirit Lake3,403.36 ft24h −0.02 ft
- Willamette River at Portland34 mi · River22,900 cfs144% of normal
- Bull Run Reservoir No 137 mi · Lake · Bull Run977.72 ft24h ±0.00 ft
About this data
- Gauge
- USGS 14219950 — Lake Merwin Near Chelatchie, Wa
- Location
- 45.9712, -122.3851 · Washington
- Measures
- Lake/reservoir water-surface elevation above NGVD 1929
- Daily statistics
- Not available (approved daily values)
- Latest reading
- Oct 26, 9:00 AM local time (provisional)
- Page built
- Oct 26, 2026 12:50 PM ET
Source: U.S. Geological Survey Water Data for the Nation (USGS monitoring location page). Readings every 15–60 minutes; the newest values are provisional. Percentiles compare today’s reading with every past year’s daily mean for the same calendar date. Weather: NOAA National Weather Service.