Big Swan Lake

Big Swan Lake pulls a D on the LakeGrade rubric — phosphorus loading and limited clarity hold it below the Minnesota average. 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. The lake bottoms out at 32 ft — a moderate depth that supports a warm-water fishery without the year-round cold refuge a deeper basin provides. Big Swan Lake covers 684 acres alongside 6.3 miles of shoreline — a mid-sized water that supports a working fishery without being so large that conditions diverge between basins. Big Swan Lake sits at rank 14 of 23 in Meeker County, in the lower half of the local distribution.

Zebra mussel presence at Big Swan Lake means the lake's clarity numbers carry an asterisk — filtered water is not the same as nutrient-poor water. The fishery includes walleye alongside the lake's other 23 documented species — a notable draw for Minnesota anglers. A documented public access point at Big Swan Lake makes the lake usable for shore fishing, paddle craft, and trailered boats. Ice-out has been recorded 8 times at Big Swan Lake, with a median around Apr 4. The grade is based on limited monitoring — fewer than three independent measurement years contribute, so future updates may shift the letter.