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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 (40)

Minnesota DNR LakeFinder resources for lakes in Sherburne County. browse all reports →

These links open on the official state DNR websites (Wisconsin DNR survey PDFs · Minnesota DNR LakeFinder).

All Lakes in Sherburne County

24 lakes · 18 graded, 6 not rated18 graded lakes · 6 not rated, hidden

#LakeGradeClarityPhosphorusAlgaeTrophicMax DepthAccess
1ABig LakeSherburneA13.6 ft10.5 µg/L6.1 µg/LNo recent samples48 ft✓ Public
2AUnnamed LakeSherburneA13 ft22 µg/L3.6 µg/LNo recent samples43 ftCarry-in
3AMitchell LakeSherburneA10 ft14.5 µg/L6.7 µg/LNo recent samples33 ftCarry-in
4ASandy LakeSherburneA14 ft12.5 µg/L3.1 µg/LNo recent samples41 ft✓ Public
5APickerel LakeSherburneA10.5 ft20 µg/L5.3 µg/LNo recent samples21 ftCarry-in
6AAnn LakeSherburneA11.5 ft15.5 µg/L4.3 µg/LNo recent samples26 ft✓ Public
7AWest Hunter LakeSherburneA10.2 ft23.5 µg/L5.3 µg/LNo recent samples6 ft✓ Public
8AEast Hunter LakeSherburneA12.5 ft24.5 µg/L5.3 µg/LNo recent samples7 ftCarry-in
9DBirch LakeSherburneD5.8 ft21 µg/L18 µg/LNo recent samples18 ft✓ Public
10DEagle LakeSherburneD3 ft61.5 µg/L29.5 µg/LNo recent samples18 ft✓ Public
11DFremont LakeSherburneD3 ft40 µg/L17.3 µg/LNo recent samples8 ft✓ Public
12DBriggs LakeSherburneD3 ft72.5 µg/L29.4 µg/LNo recent samples25 ft✓ Public
13DJulia LakeSherburneD2 ft78 µg/L28.5 µg/LNo recent samples15 ft✓ Public
14FUpper Orono LakeSherburneF3.5 ft130.5 µg/L47.5 µg/LNo recent samplesNo recent samples✓ Public
15FElk LakeSherburneF2 ft100 µg/L50.1 µg/LNo recent samples9 ft✓ Public
16FElk LakeSherburneF2.5 ft77 µg/L50.7 µg/LNo recent samples15 ft✓ Public
17FRush LakeSherburneF2 ft113 µg/L42.1 µg/LNo recent samples11 ft✓ Public
18FLower Orono LakeSherburneF2.5 ft138 µg/L76 µg/LNo recent samples18 ft✓ Public
NRUnnamed LakeSherburneNR5.2 ft34 µg/L5.7 µg/LNo recent samplesNo recent samplesNot recorded
NRThompson LakeSherburneNR10 ftNo recent samplesNo recent samplesNo recent samples22 ftCarry-in
NRCamp LakeSherburneNR10.5 ftNo recent samplesNo recent samplesNo recent samples34 ft✓ Public
NRCantlin LakeSherburneNR10 ftNo recent samplesNo recent samplesNo recent samplesNo recent samplesCarry-in
NRBig LakeSherburneNR17.5 ftNo recent samplesNo recent samplesNo recent samples48 ft✓ Public
NRLake MitchellSherburneNR10.5 ftNo recent samplesNo recent samplesNo recent samples33 ftCarry-in

NR = not rated: the monitoring record does not meet the evidence bar for a grade. That is EPA Integrated Reporting Category 3 (insufficient information), not a failing grade. How grading works.

Lake Match

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Six questions — swimming, fishing, quiet, cabins, drive time — and a shortlist of graded lakes that fit, with the water quality behind each one.

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See how Sherburne County stacks up in the national county water-quality rankings, or browse the full directory of graded lakes across all 39 states and 2 Canadian provinces.

Source: EPA National Aquatic Resource Surveys, 2026.