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LakeQuality
C

Anoka County Lake Quality

Minnesota, 24 lakes, average grade C (Fair)

Anoka County's 24 graded lakes fall in the moderate-density bracket for Minnesota. The county-level average smooths over real differences — a single agricultural watershed near the southwest corner can pull the average down even if the rest of the county runs clean. Anoka County averages to a C. The distribution behind that average matters more than the letter: a few stressed lakes versus many decent ones can produce the same average as the inverse.

Most of the county's monitored lakes are shallow — under 50 feet — which means wind keeps the water column mixed all summer and sediment-bound phosphorus releases back into the surface layer whenever the bottom is disturbed. Netta Lake (A) is the cleanest in the county.

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DNR Reports (46)

Minnesota DNR LakeFinder resources for lakes in Anoka County. Showing 12 most recent — browse all reports →

All Lakes in Anoka County

RankLakeGradeClarityMax DepthPhosphorus
1Netta LakeA11.3 ft-14.5 µg/L
2East Twin LakeB10.7 ft68 ft18.5 µg/L
3Round LakeB8.2 ft-19 µg/L
4Laddie LakeB-4 ft22 µg/L
5Crooked LakeB7.4 ft26 ft24 µg/L
6Ham LakeB8.9 ft22 ft22 µg/L
7George LakeC7.3 ft32 ft22 µg/L
8Coon LakeC5.6 ft27 ft23 µg/L
9Boot LakeC6.7 ft19 ft31 µg/L
10Grass LakeC3.9 ft-23 µg/L
11Linwood LakeC3.9 ft42 ft42.5 µg/L
12Howard LakeC2.8 ft-25 µg/L
13Amelia LakeC3.9 ft-37 µg/L
14Golden LakeC5 ft25 ft56 µg/L
15Moore LakeC3.9 ft5 ft39 µg/L
16Pickerel LakeD5 ft--
17Martin LakeD2.5 ft20 ft53.5 µg/L
18Sandy LakeD2.5 ft-76 µg/L
19Peltier LakeF2 ft18 ft361.5 µg/L
20Rice LakeF2.3 ft-128 µg/L
21Typo LakeF1 ft6 ft198 µg/L
22Locke LakeF3 ft-107 µg/L
23Centerville LakeF2.8 ft19 ft99 µg/L
24Marshan LakeF1.2 ft--

Source: EPA National Aquatic Resource Surveys, 2026.