Lake Merwin fishing forecast today
Today's best fishing times, weather, moon and the latest trout stocking for Lake Merwin in Cowlitz County, Washington.
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- Calm, still conditions
Best times to fish
All 5 times today
Good Calm, still conditions - Rain likely (87%)
All 5 times this day
Good Light wind (up to 6 mph) - Moon times line up with dawn or dusk
All 5 times this day
Fair Light wind (up to 5 mph) - Sharp temperature drop - fish often slow after a front - New moon - biggest tides of the month
All 4 times this day
Good Light wind (up to 8 mph) - New moon - biggest tides of the month
Good Light wind (up to 9 mph) - Moon times line up with dawn or dusk
All 5 times this day
Good Light wind (up to 12 mph)
All 6 times this day
Stocking history7 plants, 57,771 fish in 12 months
| Date | Fish | Size |
|---|---|---|
| Oct 1, 2026 | 45,000 kokanee | Small - under 10 in |
| Jul 13, 2026 | 1,732 rainbow trout | Jumbo - about 1.4 lb each |
| Jul 13, 2026 | 821 rainbow trout | Jumbo - about 3.3 lb each |
| Jul 13, 2026 | 1,732 rainbow trout | Jumbo - about 1.4 lb each |
| Jul 13, 2026 | 826 rainbow trout | Jumbo - about 3.3 lb each |
| Apr 29, 2026 | 1,950 tiger muskie | Catchable - about 10 to 12 in |
| Feb 23, 2026 | 5,710 kokanee | Catchable - about 10 to 12 in |
From Washington Department of Fish and Wildlife hatchery release records, updated daily. See the full Washington stocking report.
Hourly weatherNWS
Areas of fog before 1pm. Mostly sunny. High near 55, with temperatures falling to around 51 in the afternoon. South southeast wind around 2 mph.
Sun and moonWaning crescent
11% of the moon is lit
| Day | Sun | Moon | Solunar periods |
|---|---|---|---|
| Today | 6:55 AM 4:50 PM | Rise 3:08 AM Set 3:08 PM | Minor 2:38 AM Major 8:12 AM Minor 2:38 PM Major 8:40 PM |
| Fri 6 | 6:57 AM 4:49 PM | Rise 4:21 AM Set 3:26 PM | Minor 3:51 AM Major 8:56 AM Minor 2:56 PM Major 9:24 PM |
| Sat 7 | 6:58 AM 4:48 PM | Rise 5:33 AM Set 3:46 PM | Minor 5:03 AM Major 9:40 AM Minor 3:16 PM Major 10:12 PM |
| Sun 8 | 7:00 AM 4:46 PM | Rise 6:44 AM Set 4:10 PM | Minor 6:14 AM Major 10:28 AM Minor 3:40 PM Major 10:56 PM |
| Mon 9 | 7:01 AM 4:45 PM | Rise 7:54 AM Set 4:38 PM | Minor 7:24 AM Major 11:16 AM Minor 4:08 PM |
| Tue 10 | 7:03 AM 4:44 PM | Rise 9:00 AM Set 5:14 PM | Major 11:44 PM Minor 8:30 AM Major 12:08 PM Minor 4:44 PM |
| Wed 11 | 7:04 AM 4:43 PM | Rise 10:00 AM Set 5:58 PM | Major 12:36 AM Minor 9:30 AM Major 1:00 PM Minor 5:28 PM |
Calculated for this location. Moon times are accurate to within a few minutes. Major periods are the 2 hours around the moon passing overhead or underfoot; minor periods are the hour around moonrise and moonset.
Fishing Lake Merwin
Lowland lakes west of the Cascades, many close to Seattle, Tacoma, Olympia and Vancouver. Mild winters mean many of these lakes are stocked and fished year-round.
What's biting now (Fall): Fall stocking of catchable and jumbo trout in many western Washington lakes; trout feed well as water cools.
Commonly caught in this area: Rainbow trout (stocked), cutthroat, kokanee, plus largemouth bass, perch and crappie in warmer months.
Also caught here: smallmouth bass, bluegill, brook trout.
Freshly stocked trout tend to cruise near the surface and along the shoreline in the first days after a plant. Simple setups work: a small spinner, a bobber with bait or PowerBait, or a slowly trolled small lure.
Best baits here6 fish
How the bite outlook works
The rating is our estimate, not a guarantee. It combines recent stocking, wind, rain and storms, temperature swings, the moon phase and how well the solunar periods line up with dawn and dusk. Fish do not read forecasts - local knowledge always wins. Read more
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