Northeast of Watertown, the Indian River is known for excellent fly fishing. It runs over 100 miles from the Indian River Village to Black Lake through Lewis County, Jefferson County and St Lawrence County. The rivers corridor is mostly flat with some low rolling hills and occasional steep slopes resulting in rapids and waterfalls. In its upper reaches, the Indian River makes a series of turns, alternately flowing north and southwest. At Evans Mills, it turns back on itself once more and flows north to where it enters the Oswegatchie River at Black Lake. Extensive areas of both marsh and pasture land flank much of the river. Sections of rocky ledges and wooded banks are frequently encountered, adding a bit more dramatic element to the landscape.
From Indian River Village downstream to Natural Bridge (about 14.5 miles), the river is nothing more than a stream. Its banks are overgrown in spots and its channel is shallow and narrow, making this stretch unnavigable. However, the Department of Environmental Conservation (DEC) does stock this section with both brown and brook trout and good fishing is available for those willing to work for it.
From Natural Bridge to Theresa, the Indian is scenic, peaceful and largely underutilized. Here one can find peace and solitude of the the outdoors in very picturesque settings. The section of the Indian River from Theresa to Black Lake is one of the more popular sections for fly fishing.
Overall, Indian River is the 15th most popular fly fishing river of all 32 fly fishing spots in New York.