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D

George Watch Lake

Anoka County, MinnesotaEutrophic

On the scoring rubric George Watch Lake grades a D: clarity at 3.4 ft and 270 µg/L of phosphorus keep it in the lower bracket for Anoka County. High phosphorus is the leading drag on the score — likely from upland agriculture, lawn runoff, or in-lake sediment release.

Eutrophic conditions are the baseline here: clarity drops noticeably in late summer, and dissolved oxygen near the bottom can become a concern. 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. Within Anoka County's 26 graded lakes, George Watch Lake ranks 19 — below the local median, though not at the bottom.

George Watch Lake carries an invasive watermilfoil record — boat-launch decontamination and shoreline care matter more here than at uninfested lakes. The state fisheries records do not list documented species for George Watch Lake, which usually reflects a lack of formal fisheries survey work rather than an empty lake. A documented public access point at George Watch Lake makes the lake usable for shore fishing, paddle craft, and trailered boats. Multiple sampling years from Minnesota PCA volunteers and partner agencies back the grade, so the letter should hold steady absent a major watershed shift.

Source: EPA Water Quality Portal sampling records, Minnesota DNR LakeFinder, last sampled 2024-06-07. Grade methodology: LakeGrade methodology.

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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 3.4 ft. Phosphorus level: 270 µg/L. Chlorophyll-a: 13 µg/L. Trophic State Index: 67.

MetricValueGrade
Water Clarity (Secchi Depth)3.4 ftD
Phosphorus270 µg/LF
Chlorophyll-a (Algae)13 µg/LC
Trophic State Index (TSI)67Eutrophic

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.

Eurasian watermilfoil

Water Quality Trend: Improving

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

MetricTrendChange/YearYears
Water Clarity Improving+0.186 m/yr5
See year-by-year chart →

Location

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County Ranking

Ranked #19 of 26 lakes in Anoka County

Cleaner Lakes Within 30 Miles

George Watch Lake holds Grade D. 2 nearby lakes hold higher grades.

See full comparison →

Nearby Lakes in Anoka County

EPA Impairment Status

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

Causes of impairment

Nutrients (phosphorus, nitrogen)

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

Source: EPA ATTAINS assessment unit MN02-0005-00 · Official waterbody report

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: 2024-06-07

Monitoring stations: 1