The 461-acre lake is a popular fishing destination stocked with hybrid saugeye, walleye, bluegill, bass, and crappie. The lake also produces some redears and an occasional channel catfish. Sullivan Lake is also known for several fishing tournaments each year.
The lake has produced two state record saugeye catches (the latest being 8 pounds 3 ounces). There are a lot of hybrids in the lake, with an average size of 2 to 3 pounds. Bass up to 6 pounds and crappies up to 3 pounds are not uncommon.
The lake has a maximum depth of 25 feet and an average depth of around 10 feet. There is a state-of-the-art fish cleaning station located at the 40-ft main boat launch. There is also a handicap accessible fishing pier and boat launch available.