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D

Bass Lake

St. Louis County, MinnesotaLimited DataEutrophic

Bass Lake earns a D — measurements through 2024 show persistent nutrient pressure that limits clarity through the summer.

At a TSI of 56, Bass Lake reads as eutrophic — nutrient-rich enough that summer algal growth and reduced clarity are expected, not unusual. The lake's maximum depth is not yet documented in state morphometric records — context for its physical structure remains limited. The lake's surface area is not consistently recorded across state datasets — physical context remains partial. Bass Lake ranks 160 of 187 in St. Louis County — at the lower end of the locally monitored distribution.

An invasive species record — spiny waterflea — has been logged at Bass Lake; Minnesota PCA maintains the official infested-waters list. The state fisheries records do not list documented species for Bass Lake, which usually reflects a lack of formal fisheries survey work rather than an empty lake. A documented public access point at Bass Lake makes the lake usable for shore fishing, paddle craft, and trailered boats. The grade is based on limited monitoring — fewer than three independent measurement years contribute, so future updates may shift the letter.

Source: EPA Water Quality Portal sampling records, Minnesota DNR LakeFinder, last sampled 2024-08-31. Grade methodology: LakeGrade methodology.

Reviewed by LakeQuality Editorial Team · Updated

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Swimming Safety

Swimming not recommended, poor water quality with high algae risk

Water Quality Grade: D, Poor

Murky, only visible to about 4.2 ft. Trophic State Index: 56.

MetricValueGrade
Water Clarity (Secchi Depth)4.2 ftD
PhosphorusNo data
Chlorophyll-a (Algae)No data
Trophic State Index (TSI)56Eutrophic

High nutrients, frequent algae, reduced clarity

Invasive & Introduced Species

Red chips are ecologically harmful invasive species. Gray chips are stocked or introduced fish that aren't a current ecological concern.

spiny waterflea

Water Quality Trend: Declining

Based on 5 years of monitoring data (2020-2025).

MetricTrendChange/YearYears
Water Clarity Declining-0.084 m/yr5
See year-by-year chart →

Location

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County Ranking

Ranked #160 of 187 lakes in St. Louis County

Cleaner Lakes Within 30 Miles

Bass Lake holds Grade D. One nearby lake has a higher grade.

Nearby Lakes in St. Louis County

Eutrophic Lakes in Minnesota

DNR Reports & Resources

Minnesota DNR LakeFinder publishes lake survey, fish stocking, water access, and aquatic plant data for Bass Lake. 1 report on file.

EPA Impairment Status

Bass Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).

Causes of impairment

MercurySalinity / chlorides

A Total Maximum Daily Load (TMDL) plan has been approved.

Source: EPA ATTAINS assessment unit MN69-0378-01 · Official waterbody report · Matched by proximity (0.9 km)

Data Sources

Water quality data from the EPA Water Quality Portal

Impairment status from EPA ATTAINS 303(d) database

Grading methodology based on Metropolitan Council standards

Most recent sample: 2024-08-31

Monitoring stations: 1