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LakeQuality

Mille Lacs Lake vs Ml-Ditch 36 Lake

Water quality, depth, fish species, and recreation comparison.

Mille Lacs Lake has a higher water quality grade (B, Good) than Ml-Ditch 36 Lake (C, Fair). Both are in Aitkin County, Minnesota.

Both Mille Lacs Lake and Ml-Ditch 36 Lake sit in Minnesota. A same-state comparison strips out the state-level water-quality regime as a variable: any grade differences here are about the lakes themselves, not the agencies grading them. The grades are close: Mille Lacs Lake (B) and Ml-Ditch 36 Lake (C) are within one letter of each other on the LakeGrade rubric. The per-parameter sub-grades below will show where the small differences actually live.

With grades this close, the choice between the two lakes turns on non-water-quality factors: depth, fish species, public access, distance from home. The per-lake pages below cover all of those.

B

Mille Lacs Lake

Aitkin County, Minnesota

Good clarity, visible to about 10.5 ft.

C

Ml-Ditch 36 Lake

Aitkin County, Minnesota

Murky, only visible to about 5.7 ft.

Side-by-Side Metrics

Source: EPA National Aquatic Resource Surveys, 2026.

Source: EPA National Aquatic Resource Surveys, 2026.

Source: EPA National Aquatic Resource Surveys, 2026.

Source: EPA National Aquatic Resource Surveys, 2026.

Source: EPA National Aquatic Resource Surveys, 2026.

Source: EPA National Aquatic Resource Surveys, 2026.

Source: EPA National Aquatic Resource Surveys, 2026.

Source: EPA National Aquatic Resource Surveys, 2026.

Source: EPA National Aquatic Resource Surveys, 2026.

MetricMille Lacs LakeMl-Ditch 36 Lake
Overall GradeB (Good)C (Fair)
Water Clarity10.5 ft5.7 ft
PhosphorusNo data23.5 µg/L
Chlorophyll-a (Algae)No data5.2 µg/L
Maximum Depth42 ft42 ft
Surface Area128.3K acres128.3K acres
Public AccessYesYes
Fish Species11
Trophic Statemesotrophicmesotrophic

Bold value = better for that metric (lower phosphorus / chlorophyll = cleaner; higher Secchi / depth / species count = better).

Verdict

Mille Lacs Lake wins on overall water quality with a Grade B versus Ml-Ditch 36 Lake's Grade C. Water clarity: 10.5 ft vs 5.7 ft. For fishing diversity, Mille Lacs Lake also leads with 1 species.