Prosser Creek Reservoir is fishing consistently for both trout and bass. Surface temps are in the mid-60s°F, and water levels are around 85% full. Shore anglers are finding steady action at sunrise and sunset near the dam with worms, eggs, or PowerBait. Trollers are doing well at 50–70 feet with Rapalas. For fly anglers, the Alder Creek inlet is a good spot—focus on streamers, midges, or callibaetis.