Granite Lake

Granite Lake earns a C — middle-of-the-pack water quality, with one or two parameters dragging the average down from a stronger grade. The three sub-grades — clarity, phosphorus, and chlorophyll-a — track close together, so no single parameter is dragging the average.

Eutrophic conditions are the baseline here: clarity drops noticeably in late summer, and dissolved oxygen near the bottom can become a concern. Granite Lake reaches 34 ft at its deepest point — typical for Minnesota mid-sized lakes, with seasonal stratification but limited cold-water refuge. At 362 acres, Granite Lake fits the Minnesota median for monitored lakes, with 3.8 miles of shoreline. Among the 64 graded lakes in Wright County, Granite Lake sits at rank 31, above the county median.

Eurasian watermilfoil has been documented at Granite Lake, requiring shoreline management to keep dense mats from crowding native vegetation. Walleye are documented at Granite Lake, one of 13 fish species on record for the lake. A documented public access point at Granite Lake makes the lake usable for shore fishing, paddle craft, and trailered boats. Ice-out has been recorded 20 times at Granite Lake, with a median around Apr 9. The grade is based on limited monitoring — fewer than three independent measurement years contribute, so future updates may shift the letter.