Washington is not known for largemouth fishing, but there’s quality action during May and June at Potholes Reservoir. Midway between Seattle and Spokane, off I-90, Potholes Reservoir is the result of a massive irrigation project and also offers good largemouth bass fishing-fish averaging two pounds along with some four- to seven-pounders. Focus on the spawn, particularly in May, after the water has warmed and is still high enough to provide good access to backwater areas. In the spring, the Winchester Wasteway area and Crab Creek arms are good bets. The daily limit is five bass; only three can be over 15 inches. Plastic worms in dark colors, spinnerbaits and tube baits are the preferred lures. A resort on the lake has campsites, motel units, boat rentals and guide service. A season resident license is $20; nonresidents pay $40. A two-day license is $6. Contact: Washington Department of Fish and Wildlife (509-754-4624).