Cass Lake Allens Bay

Cass Lake Allens Bay earns an A — water clarity, phosphorus, and chlorophyll-a all rate among the best monitored waters in Beltrami County. 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.

A TSI near 41 places Cass Lake Allens Bay in the mesotrophic band — moderate productivity, with seasonal swings between clearer spring water and richer late-summer conditions. The lake's 120 ft maximum depth is in the upper tier for Minnesota — deep enough for cold-water fish to find refuge in summer. Cass Lake Allens Bay covers 15,958 acres alongside 45.4 miles of shoreline, large enough that conditions can vary meaningfully between bays. Within Beltrami County's 95 graded waters, Cass Lake Allens Bay sits at rank 18, near the top of the local distribution.

Cass Lake Allens Bay is on the Minnesota infested-waters list for zebra mussels — boaters should follow clean-drain-dry protocols when moving gear to or from the lake. Muskie are on the species list at Cass Lake Allens Bay, alongside the lake's 21 other documented fish. A documented public access point at Cass Lake Allens Bay makes the lake usable for shore fishing, paddle craft, and trailered boats. The lake has a partial ice record — 10 observed ice-outs, centered near Apr 24. 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.