Merwin Reservoir was formed after the completion of Merwin Dam, in 1931 by the Inland Power and Light Company. The reservoir fluctuates depending on the amount of run-off making boat access difficult at times.
Kokanee are the main target, however, Tiger Muskie planted in 1995 are also popular with anglers. This North Fork Lewis River impoundment located near the town of Ariel, on the south side of Highway SR"503, is shared by Clark and Cowlitz counties.
All Bull Trout and Dolly Varden must be released.
PacifiCorp operates boat launches at Speelyai Bay and Cresap Bay.There is a fee to launch on weekends.Call (800) 547-1501 for updated reservoir levels.
There is very limited shore access.
Two-pole fishing is allowed
Shoreline access: Good - Very limited.
Species you might catch
Acreage: 3835.60 ac.
Elevation: 242 ft.
Center: 45.979477, -122.448448
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Fishing prospects calendar
The Kokanee fishery typically lasts from April-October before the adults leave the lake to spawn in tributaries starting in late-October and early-November. Fishing is best in the spring before they move into deeper water to avoid warming water temperatures, but they can be targeted throughout the summer in deeper offshore areas near the thermocline. There may be a slight uptick in some waters in the fall as adults return to shallower water and move near shore towards spawning tributaries.
Fishing success for Northern Pikeminnow increases in May and June as water temperatures increase, and generally peaks in late June, although fishing conditions can vary throughout the Columbia River. After a lull during the heat of summer, fishing success peaks again in late September-early October. Northern Pikeminnow congregate in rocky areas with fast currents near dams, islands, stream mouths, points, eddies, rows of pilings, and ledges or bars in the river. Sunrise, sunset, and night are generally the best fishing times. Studies show there are greater concentrations of Northern Pikeminnow in shallow water during low-light conditions.