The walleye population in Alton Lake was above average for the lake class and should provide good walleye angling. The walleye size (about 1.1 pounds) was smaller than average for this type of lake; however, 35% of the walleye sampled were greater than 14 inches. Large walleye (greater than 5 pounds) were sampled in 2008 and anglers should not be surprised to have a trophy walleye on their line. Northern pike are present in below average numbers although there is a history of quality, greater than 30 inches, sized northern pike in Alton Lake. Smallmouth bass were sampled in below average numbers with the average size of 12 inches and the largest fish measured 15.5 inches. Tullibees were present in above average numbers in 2008; the average weight was 1.8 pounds. Other species an angler might encounter include: brook trout, yellow perch and white sucker.
Alton Lake is completely within the Boundary Waters Canoe Area Wilderness (BWCAW) and is accessible on portage trails from other area lakes. The U.S. Forest Service administers the BWCAW and the sixteen campsites on Alton Lake. There is a fee charged for over-night use and a day-use permit is required for shorter trips.