Blue River Anglers. This company runs fly-fishing tours on the Blue, Colorado, South Platte, Eagle, Arkansas, and Williams Fork rivers, as well as various lakes and streams in the area. If you're lucky, you may catch 10- to 20-inch rainbow and brown trout. 281 Main St., Frisco, Colorado, 80443. 888/453–9171; 970/668–2583; www.blueriveranglers.com.