Pebble Lake

Pebble Lake sits at the top of the Minnesota PCA grading rubric with an A, a mark reached by the cleanest lakes in Minnesota. Sub-grades cluster within a single letter of each other, which usually means the lake is in stable trophic balance rather than fighting one specific stressor.

Mesotrophic conditions dominate at Pebble Lake: enough nutrients for a healthy fishery, not so much that algal blooms become a chronic problem. The lake's 62 ft maximum depth is in the upper tier for Minnesota — deep enough for cold-water fish to find refuge in summer. At 195 acres, Pebble Lake fits the Minnesota median for monitored lakes, with 2.4 miles of shoreline. Pebble Lake ranks 42 of 97 in Otter Tail County — solidly in the upper half of the local distribution.

Pebble Lake has no invasive species recorded in Minnesota state databases as of 2024, though prevention practices still apply at all access points. Walleye are documented at Pebble Lake, one of 14 fish species on record for the lake. Public access is available — the lake is on the Minnesota PCA public-access list. The grade is based on limited monitoring — fewer than three independent measurement years contribute, so future updates may shift the letter.