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C

Amelia Lake

Anoka County, MinnesotaEutrophic

Amelia Lake earns a C — middle-of-the-pack water quality, with one or two parameters dragging the average down from a stronger grade. With clarity and phosphorus scored, the sub-grades cluster within a letter of each other, pointing to stable conditions rather than one specific stressor.

At a TSI of 57, Amelia 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. Amelia Lake sits at rank 13 of 24 in Anoka County, in the lower half of the local distribution.

An invasive species record — flowering rush — has been logged at Amelia Lake; Minnesota PCA maintains the official infested-waters list. The state fisheries records do not list documented species for Amelia Lake, which usually reflects a lack of formal fisheries survey work rather than an empty lake. No formal public access is documented at Amelia Lake — most use is by shoreline residents and their guests. 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.

Source: EPA Water Quality Portal sampling records, Minnesota DNR LakeFinder, last sampled 2024-09-25. Grade methodology: LakeGrade methodology.

Reviewed by LakeQuality Editorial Team · Updated

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Swimming Safety

Generally safe for swimming, moderate water quality

Water Quality Grade: C, Fair

Murky, only visible to about 3.9 ft. Phosphorus level: 37 µg/L. Trophic State Index: 57.

MetricValueGrade
Water Clarity (Secchi Depth)3.9 ftD
Phosphorus37 µg/LC
Chlorophyll-a (Algae)No data
Trophic State Index (TSI)57Eutrophic

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.

flowering rush

Water Quality Trend: Improving

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

MetricTrendChange/YearYears
Water Clarity Improving+0.681 m/yr5
Phosphorus Improving-1.05 µg/L/yr5
See year-by-year chart →

Location

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County Ranking

Ranked #13 of 24 lakes in Anoka County

Cleaner Lakes Within 30 Miles

Amelia Lake holds Grade C. 2 nearby lakes hold higher grades.

See full comparison →

Nearby Lakes in Anoka County

EPA Impairment Status

Amelia Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 4A).

Causes of impairment

Mercury

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

Source: EPA ATTAINS assessment unit MN02-0003-00 · Official waterbody report · Matched by proximity (1.56 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: 2024-09-25

Monitoring stations: 1