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LakeQuality
C

Sherburne County Lake Quality

Minnesota, 24 lakes, average grade C (Fair)

There are 24 graded lakes in Sherburne County. The mix is varied enough that the county-level average tells you the broad strokes, not the choose-this-cabin specifics. The county average is C — the middle of the rubric, with one or two lakes pulling the average up or down depending on year.

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. Big Lake (A) is the cleanest in the county.

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DNR Reports (49)

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

All Lakes in Sherburne County

RankLakeGradeClarityMax DepthPhosphorus
1Big LakeA17.5 ft48 ft-
2East Hunter LakeA22.1 ft-26 µg/L
3Big LakeA13.5 ft48 ft10.5 µg/L
4Mitchell LakeA10 ft33 ft14.5 µg/L
5Sandy LakeA14.1 ft41 ft12.5 µg/L
6Ann LakeA11.6 ft26 ft15.5 µg/L
7Unnamed LakeB13.5 ft43 ft23 µg/L
8Thompson LakeB10 ft22 ft-
9Pickerel LakeB10 ft21 ft24 µg/L
10Camp LakeB10.5 ft34 ft-
11Cantlin LakeB10 ft--
12Lake MitchellB10.5 ft33 ft-
13West Hunter LakeB17.2 ft-30 µg/L
14Birch LakeC5.8 ft18 ft21 µg/L
15Unnamed LakeC5.2 ft-34 µg/L
16Eagle LakeD3 ft18 ft61.5 µg/L
17Fremont LakeD3 ft8 ft63.5 µg/L
18Elk LakeD2.5 ft15 ft74 µg/L
19Briggs LakeD3 ft25 ft70 µg/L
20Julia LakeD2 ft15 ft80 µg/L
21Upper Orono LakeF3 ft-130.5 µg/L
22Elk LakeF2 ft9 ft100 µg/L
23Rush LakeF2 ft11 ft115 µg/L
24Lower Orono LakeF2.3 ft18 ft156 µg/L

Source: EPA National Aquatic Resource Surveys, 2026.