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About this water
Lake Merwin is a 3,837 acre lake in Clark County, Washington. State records show it stocked 188 times between 2000 and 2026. The most-stocked species are kokanee, rainbow trout and tiger muskie, with 4 more on record. 2,710,355 kokanee have gone in across 82 releases.
Boat access nearby
One mapped launch sits within 2 miles of Lake Merwin. Ramp data comes from the USGS national boat-ramp inventory.
- Speelyai Bay ParkMerwin ReservoirPublic
Stocking history
188 recorded stockings
| Date | Species | Number | Size | Hatchery |
|---|---|---|---|---|
| Apr 29, 2026 | Tiger Muskie · Wyoming Fish & Game | 1,950 | — | Meseberg Hatchery |
| Feb 23, 2026 | Kokanee · Lake Merwin | 5,710 | — | Speelyai Hatchery |
| Oct 1, 2025 | Kokanee · Lake Merwin | 35,570 | — | Speelyai Hatchery |
| Jul 14, 2025 | Rainbow · Goldendale | 1,699 | — | Merwin Hatchery |
| Jul 14, 2025 | Rainbow · Goldendale | 783 | — | Merwin Hatchery |
| Jul 14, 2025 | Rainbow · Goldendale | 784 | — | Merwin Hatchery |
| Jul 14, 2025 | Rainbow · Goldendale | 1,699 | — | Merwin Hatchery |
| Apr 29, 2025 | Tiger Muskie · Wyoming Fish & Game | 1,939 | — | Meseberg Hatchery |
| Mar 1, 2025 | Kokanee · Lake Merwin | 50,700 | — | Speelyai Hatchery |
| Oct 7, 2024 | Kokanee · Lake Merwin | 45,750 | — | Speelyai Hatchery |
| Jul 15, 2024 | Rainbow · Goldendale | 942 | — | Merwin Hatchery |
| Jul 15, 2024 | Rainbow · Goldendale | 788 | — | Merwin Hatchery |
Showing the 12 most recent of 188. Stocking records for Lake Merwin published by Washington Department of Fish and Wildlife. Stocking does not guarantee fish are present. Check current regulations and access before you go. See the full Washington stocking report.
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