The Farmington River, from below Goodwin Dam (Hartland, CT) to its confluence with the Connecticut River (Windsor, CT), contains a diversity of habitat, fish species, and fisheries. Nearly every sportfish species existing in Connecticut may be found in the Farmington.
The River can be broken up into three sections. The Upper River, from Hartland to Route 202 in Canton, is classic trout habitat with a mixture of riffles and pools and favorable water temperatures for most of the year. The Middle River, from the Route 202 bridge to the Rainbow Reservoir, which contains decent trout habitat in the upper portion, slowly giving way to warmwater species and a shallower gradient in the lower reaches. And, lastly, the Lower River, from Rainbow Dam until its confluence with the Connecticut which is known primarily for its shad fishing during the summer run.
-- Excerpted from A Guide to Fishing the Farmington River
"Because it's a tailwater fishery, the Farmington is a great go-to river for most of the season. When the summers get hot and trout are hunkered down throughout the rest of New England, the Farmington continues to give anglers quality trout fishing."