Lake Merwin fish stocking
Cowlitz County, Washington
Lake Merwin in Cowlitz County, Washington was last stocked on July 13, 2026 with 5,111 rainbow trout from Merwin Hatchery. Across the 5 years shown here, WDFW released 396,697 fish in 35 separate stockings. Stockings here are most common in March, August, and October.
When Lake Merwin gets fish
Stocking history
Washington reports the exact release date. Sizes for Washington are estimated from the reported fish-per-pound.
2026 · 12,771 fish
| Date | Species | Fish | Size | Type |
|---|---|---|---|---|
| Rainbow Trout | 1,732 | 14.2″ | Catchable | |
| Rainbow Trout | 821 | 18.8″ | Catchable | |
| Rainbow Trout | 1,732 | 14.2″ | Catchable | |
| Rainbow Trout | 826 | 18.8″ | Catchable | |
| Tiger Muskie | 1,950 | 8.4″ | Catchable | |
| Kokanee | 5,710 | 9.4″ | Catchable |
2025 · 93,174 fish
| Date | Species | Fish | Size | Type |
|---|---|---|---|---|
| Kokanee | 35,570 | 5.6″ | Fry | |
| Rainbow Trout | 1,699 | 14.2″ | Catchable | |
| Rainbow Trout | 784 | 18.8″ | Catchable | |
| Rainbow Trout | 783 | 18.8″ | Catchable | |
| Rainbow Trout | 1,699 | 14.2″ | Catchable | |
| Tiger Muskie | 1,939 | 8.5″ | Catchable | |
| Kokanee | 50,700 | 6.8″ | Catchable |
2024 · 102,906 fish
| Date | Species | Fish | Size | Type |
|---|---|---|---|---|
| Kokanee | 45,750 | 6.3″ | Catchable | |
| Rainbow Trout | 942 | 14.2″ | Catchable | |
| Rainbow Trout | 788 | 21.5″ | Catchable | |
| Rainbow Trout | 942 | 14.2″ | Catchable | |
| Rainbow Trout | 765 | 21.5″ | Catchable | |
| Tiger Muskie | 869 | 8.6″ | Catchable | |
| Kokanee | 52,850 | 6.9″ | Catchable |
2023 · 45,653 fish
| Date | Species | Fish | Size | Type |
|---|---|---|---|---|
| Kokanee | 40,500 | 6.3″ | Catchable | |
| Rainbow Trout | 668 | 12.6″ | Catchable | |
| Rainbow Trout | 906 | 20″ | Catchable | |
| Rainbow Trout | 668 | 12.6″ | Catchable | |
| Rainbow Trout | 891 | 20″ | Catchable | |
| Tiger Muskie | 2,020 | 7.7″ | Catchable |
2022 · 142,193 fish
| Date | Species | Fish | Size | Type |
|---|---|---|---|---|
| Kokanee | 22,380 | 5.6″ | Fry | |
| Kokanee | 49,540 | 4.1″ | Fry | |
| Kokanee | 22,860 | 3.2″ | Fry | |
| Rainbow Trout | 979 | 20″ | Catchable | |
| Rainbow Trout | 988 | 20″ | Catchable | |
| Rainbow Trout | 583 | 11.5″ | Catchable | |
| Rainbow Trout | 583 | 11.5″ | Catchable | |
| Tiger Muskie | 1,600 | 8.7″ | Catchable | |
| Kokanee | 42,680 | 6.8″ | Catchable |
Frequently asked questions
When was Lake Merwin last stocked?
WDFW records show Lake Merwin was last stocked on July 13, 2026 (about 3 months ago), with 5,111 rainbow trout.
What fish are stocked in Lake Merwin?
Lake Merwin has been stocked with kokanee, rainbow trout, and tiger muskie in the years shown here (2022–2026).
When does Lake Merwin usually get stocked?
Most fish have been stocked in March, August, and October. Exact dates change from year to year, so check back or see WDFW's official stocking page.
Do I need a license to fish Lake Merwin?
Yes, anglers generally need a valid Washington fishing license. Check the current Washington fishing regulations for seasons, limits and any special rules for Lake Merwin.
Other stocked waters in Cowlitz County
Horseshoe Lake
Kress Lake
Lake Sacajawea
Cowlitz River
Silver Lake
Merrill Lake
All 7 stocked waters in Cowlitz County →
Source: WDFW Fish Plants (data.wa.gov). Stocked Lakes is not affiliated with Washington Department of Fish and Wildlife. Spot a problem? Let us know.