The Lehigh River flows over 100 miles through Pennsylvania and serves as the largest tributary to the Delaware River. Trout fishing on the Lehigh River consists of 20 miles of small, easy-to-wade water flowing through a series of glacial bogs and marshes surrounded by scenic state forest near Goulsboro, Pennsylvania, and a 35-mile stretch below the Francis E. Walter Dam from Whitehaven to Walnutport. The river contains a robust population of wild browns and rainbows and supports an impressive variety of mayflies, caddisflies, and stoneflies. May and June are “Prime Time” on the Lehigh, and the March Brown, Grey Fox, Sulphur, and Caddis hatches can be phenomenal. Hatches of Blue Wing Olives, Light Cahills, and Isonychias begin in earnest in June. As summer begins, Caddis hatch in good numbers along with small Blue Wing Olives, Isonychias, and summer Stenonemas (Sulphurs). Mornings can produce good trico hatches in the Lehighton to Bowmanstown stretch. Come fall, Isonychias and evening hatches of Sulphurs can be outstanding. Caddis and Blue Wing Olives will be the flies the fish will key on as late fall approaches. Fishing with streamers and Wooly Buggers can be quite productive during this time of year as well. Wooly Buggers and streamers fished with a sinking line will produce fish all year long.