The waters of the Chemung River are dominated by Smallmouth Bass and Walleye. There are also Largemouth Bass, Bullheads, Carp, and Muskie. Prime fishing is during the summer and fall, but Walleye and Muskie are active into December.

Bait, Tackle and Fly Shops
Nickle Creek Bait and Tackle Shop, Elmira, NY
The Bait Shop, Horseheads, NY, 607-732-3292
Pinewood Flies, Pine Valley, NY
Hesselson's, Elmira Heights, NY, 607-733-4665

Great resources:
John Lively's Southern Tier Fishing site
Southern Tier Sportsman
Twin Tiers Five Rivers Chapter of the Federation of Fly Fishers
DEC Region 8 Fishing Hotline
DEC fishing license information (NYS offers free fishing the last full weekend of June each year. For two days, no fishing licenses are required)