August is hopper time on southwestern Wyoming's Green River as rainbow, cutthroat and brown trout pushing 20 inches cruise the surface looking for a meal of grasshoppers. Most anglers fish just below Fontenelle Dam and through the Seedskadee Wildlife Refuge, where public access is abundant. Productive water exists all the way downstream to Flaming Gorge Reservoir on the Wyoming-Utah border. Flyfishers pick up the river's big browns on Dave's and Joe's hoppers. Mayfly hatches also may be present. A variety of nymphs like Princes and Hare's Ears work, as do scuds, San Juan worms and even cranefly larvae. Spin-fishers catch big browns on green and red Krocodile spoons or with Muddler Minnows bounced along the bottom under split shot. During morning and evening look for trout throughout the river. In the hot afternoon hours concentrate on the riffles and deep pools. The daily limit is one fish longer than 20 inches. Contact: Wyoming Game and Fish Department (5400 Bishop Blvd., Cheyenne, WY 82006; 307-777-4600).