Blue is a 309 acre lake in southwestern Isanti County. Two township- owned public accesses are located on the lake; one on the southeast shore and one on the northwest. Water clarity is moderate with algal blooms more likely as summer progresses. Boat navigation during early summercan be affected by dense stands of curlyleaf pondweed in shallower areas. The lake is well developed and popular with local pleasure boaters. Managed primarily for Walleye and Largemouth Bass, the lake is stocked annually with134 pounds of Walleye fingerlings.
Anglers on Blue Lake can expect moderate fishing pressure. Largemouth Bass electrofishing found high numbers of Bass and an increase in average size. Lengths ranged from 3.7 to 18.9 inches with an average of 11.3 inches and 1.0 pounds. Walleye abundance remains at levels similar to comparable lakes and size quality remains high. Lengths ranged from 10.0 to 26.7 inches with an average of 2.6 pounds and 18.9 inches. Northern Pike numbers in Blue Lake continue to be lower than in similar lakes, but average size remains above normal. Northern Pike averaged 24.3 inches and nearly 3.3 pounds. Bluegill abundance in the trap nets increased for the second survey in a row and is back to normal levels. Bluegill average sized decreased, but harvestable fist are present as Bluegills up to 8.8 inches were observed. Black Crappie abundance and size declined from the previous assessment, but with one third of the gill net catch topping 8.0 inches, harvestable Black Crappies are available to anglers. Yellow Perch are both less plentiful and smaller than they have been, with only a few fish over 8 inches being observed.