Torch Lake, at 18 miles long , is Michigan's longest lake. Torch Lake also is Michigan's second largest lake covering over 29 square miles. Torch Lake, with an average depth of over 200 feet, is a fine habitat for trout. Downrigger fishing is the best way to go after the trout that stay in the cold depths most of the time. LENGTH : 18 mi. WIDTH : max. 2.35 miles. DEPTH : max 315 ft. ave 111 ft. THERMOCLINE : starts at 25' BOTTOM : Shoal - sand, gravel, rubble,marl. Deep - clay, marl, pulpy peat Fish Species: click name for species info black crappie, bluegill, brown trout, cisco, lake whitefish, lake trout, muskellunge, northern pike, pumpkinseed sunfish, rainbow trout, rock bass, smallmouth bass, walleye, yellow perch submergent vegetation emergent vegetation dead heads rocks & gravel floating vegetation marsh / swamp land