The upper Androscoggin River is a tailwater that emerges from the Errol Dam in Errol, New Hampshire. Fed by the shallow, warm, fertile waters of Lake Umbagog, a nutrient-rich environment results in super-sized insect hatches and fast growing fish. The river is primarily managed as a put-and-take fishery, and is stocked liberally. Anglers can expect to catch rainbow, brown, and brook trout, as well as landlocked salmon and smallmouth bass. This river is often overlooked, and does feature a healthy population of wild rainbow trout and holdover brown trout that can exceed 20 inches in length. The Andro offers something for everyone. For beginners, it is an easy river to wade and learn to catch their first trout. For the experienced angler, float trips in search of big brawling rainbow trout in powerful rapids offer an exciting challenge. Full and half-day float trips and wade trips are available. The rivers warms extensively in the summer and fishes best in May, June, September, and October.