Walker Lake

On the LakeGrade scale Walker Lake grades a B, with clarity at 7.5 ft and 27 µg/L of phosphorus placing it above the Minnesota median. Clarity, phosphorus, and chlorophyll-a all rate similarly, so there is no obvious single lever to pull on watershed management.

A TSI near 50 places Walker Lake in the mesotrophic band — moderate productivity, with seasonal swings between clearer spring water and richer late-summer conditions. A maximum depth of 29 ft puts Walker Lake in the middle of Minnesota's depth distribution. Walker Lake covers 578 acres alongside 4.8 miles of shoreline — a mid-sized water that supports a working fishery without being so large that conditions diverge between basins. Within Otter Tail County's 97 graded lakes, Walker Lake ranks 70 — below the local median, though not at the bottom.

Zebra mussels have been documented at Walker Lake, which alters the filter-feeding balance and can paradoxically increase water clarity while disrupting the food web. The state fisheries records do not list documented species for Walker Lake, which usually reflects a lack of formal fisheries survey work rather than an empty lake. A documented public access point at Walker Lake makes the lake usable for shore fishing, paddle craft, and trailered boats. Monitoring depth is thin here: the LakeGrade rubric is applied to a small number of sample years, and the grade will be revised as more data accumulates.