Isanti County Lake Quality
Minnesota, 19 lakes, average grade C (Fair)
There are 19 graded lakes in Isanti County. The mix is varied enough that the county-level average tells you the broad strokes, not the choose-this-cabin specifics. Isanti 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.
The county's lakes lean shallow, which makes the grades sensitive to wind, sediment-resuspension, and any nutrient inputs from the watershed. The cleanest lake on the books is Horseshoe Lake (A); the most-stressed is Francis Lake (F).
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Quick Answers for Isanti County
Planning a trip? Check special fishing regulations for Horseshoe Lake — or browse the full Minnesota regulations index.
Fishing in Isanti County
DNR Reports (40)
Minnesota DNR LakeFinder resources for lakes in Isanti County. browse all reports →
These links open on the official state DNR websites (Wisconsin DNR survey PDFs · Minnesota DNR LakeFinder).
- —Fisheries Lake Survey — SpectacleFisheries Lake Survey · MN DNR LakeFinder
- —Fisheries Lake Survey — South StanchfieldFisheries Lake Survey · MN DNR LakeFinder
- —Fisheries Lake Survey — SkogmanFisheries Lake Survey · MN DNR LakeFinder
- —Fisheries Lake Survey — North StanchfieldFisheries Lake Survey · MN DNR LakeFinder
- —Fisheries Lake Survey — LoryFisheries Lake Survey · MN DNR LakeFinder
- —Fisheries Lake Survey — Little StanchfieldFisheries Lake Survey · MN DNR LakeFinder
- —Fisheries Lake Survey — KransFisheries Lake Survey · MN DNR LakeFinder
- —Fisheries Lake Survey — GreenFisheries Lake Survey · MN DNR LakeFinder
- —Fisheries Lake Survey — FrancisFisheries Lake Survey · MN DNR LakeFinder
- —Fisheries Lake Survey — FlorenceFisheries Lake Survey · MN DNR LakeFinder
- —Fisheries Lake Survey — FannieFisheries Lake Survey · MN DNR LakeFinder
- —Fisheries Lake Survey — ElmsFisheries Lake Survey · MN DNR LakeFinder
- —Fisheries Lake Survey — BlueFisheries Lake Survey · MN DNR LakeFinder
- —Aquatic Plant Report — Blue (1850)Aquatic Plant Report · MN DNR LakeFinder
- —Fish Stocking History — BlueFish Stocking History · MN DNR LakeFinder
- —Public Water Access Sites — BluePublic Water Access Sites · MN DNR LakeFinder
- —Aquatic Plant Report — Elms (1842)Aquatic Plant Report · MN DNR LakeFinder
- —Aquatic Plant Report — Fannie (1854)Aquatic Plant Report · MN DNR LakeFinder
- —Fish Stocking History — FannieFish Stocking History · MN DNR LakeFinder
- —Public Water Access Sites — FanniePublic Water Access Sites · MN DNR LakeFinder
- —Aquatic Plant Report — Florence (1841)Aquatic Plant Report · MN DNR LakeFinder
- —Fish Stocking History — FlorenceFish Stocking History · MN DNR LakeFinder
- —Public Water Access Sites — FlorencePublic Water Access Sites · MN DNR LakeFinder
- —Aquatic Plant Report — Francis (1848)Aquatic Plant Report · MN DNR LakeFinder
- —Fish Stocking History — FrancisFish Stocking History · MN DNR LakeFinder
- —Public Water Access Sites — FrancisPublic Water Access Sites · MN DNR LakeFinder
- —Fish Stocking History — GreenFish Stocking History · MN DNR LakeFinder
- —Public Water Access Sites — GreenPublic Water Access Sites · MN DNR LakeFinder
- —Aquatic Plant Report — Little Stanchfield (1845)Aquatic Plant Report · MN DNR LakeFinder
- —Public Water Access Sites — Little StanchfieldPublic Water Access Sites · MN DNR LakeFinder
- —Aquatic Plant Report — Lory (1839)Aquatic Plant Report · MN DNR LakeFinder
- —Public Water Access Sites — LoryPublic Water Access Sites · MN DNR LakeFinder
- —Aquatic Plant Report — North Stanchfield (1838)Aquatic Plant Report · MN DNR LakeFinder
- —Fish Stocking History — North StanchfieldFish Stocking History · MN DNR LakeFinder
- —Aquatic Plant Report — Skogman (1849)Aquatic Plant Report · MN DNR LakeFinder
- —Fish Stocking History — SkogmanFish Stocking History · MN DNR LakeFinder
- —Public Water Access Sites — SkogmanPublic Water Access Sites · MN DNR LakeFinder
- —Aquatic Plant Report — South Stanchfield (1837)Aquatic Plant Report · MN DNR LakeFinder
- —Public Water Access Sites — South StanchfieldPublic Water Access Sites · MN DNR LakeFinder
- —Aquatic Plant Report — Spectacle (1840)Aquatic Plant Report · MN DNR LakeFinder
All Lakes in Isanti County
19 lakes · 17 graded, 2 not rated17 graded lakes · 2 not rated, hidden
| # | Lake | Grade | Clarity | Phosphorus | Algae | Trophic | Max Depth | Access |
|---|---|---|---|---|---|---|---|---|
| 1 | AHorseshoe LakeIsanti | A | 3.5 ft | 13 µg/L | 2.7 µg/L | No recent samples | No recent samples | Carry-in |
| 2 | ASpectacle LakeIsanti | A | 13.8 ft | 11 µg/L | 2.2 µg/L | No recent samples | 51.5 ft | ✓ Public |
| 3 | AUpper Birch LakeIsanti | A | 10.8 ft | 9.5 µg/L | 2.3 µg/L | No recent samples | No recent samples | Carry-in |
| 4 | ALower Birch LakeIsanti | A | 7.4 ft | 19 µg/L | 3.6 µg/L | No recent samples | No recent samples | Carry-in |
| 5 | AHoffman LakeIsanti | A | 3.7 ft | 15 µg/L | 3.6 µg/L | No recent samples | No recent samples | Carry-in |
| 6 | AHorseleg LakeIsanti | A | 3.6 ft | 17 µg/L | 3 µg/L | No recent samples | No recent samples | Carry-in |
| 7 | CSkogman LakeIsanti | C | 5.4 ft | 31 µg/L | 13.4 µg/L | No recent samples | 36 ft | ✓ Public |
| 8 | CFannie LakeIsanti | C | 6.9 ft | 35 µg/L | 9.3 µg/L | No recent samples | 33 ft | ✓ Public |
| 9 | DTwin LakeIsanti | D | 2.5 ft | 78 µg/L | 16 µg/L | No recent samples | No recent samples | Carry-in |
| 10 | DElms LakeIsanti | D | 6.5 ft | 51.5 µg/L | 8.9 µg/L | No recent samples | 26 ft | Carry-in |
| 11 | DBlue LakeIsanti | D | 8.9 ft | 44 µg/L | 21.4 µg/L | No recent samples | 31 ft | ✓ Public |
| 12 | DGreen LakeIsanti | D | 4.7 ft | 48 µg/L | 16.4 µg/L | No recent samples | 28 ft | ✓ Public |
| 13 | DLory LakeIsanti | D | 6 ft | 43 µg/L | 10.2 µg/L | No recent samples | 21 ft | ✓ Public |
| 14 | DLittle Stanchfield LakeIsanti | D | 3.5 ft | 122 µg/L | 25.4 µg/L | No recent samples | 12 ft | ✓ Public |
| 15 | FFrancis LakeIsanti | F | 2 ft | 159 µg/L | 56.1 µg/L | No recent samples | 7 ft | ✓ Public |
| 16 | FSouth Stanchfield LakeIsanti | F | 2.5 ft | 119 µg/L | 32 µg/L | No recent samples | 17 ft | ✓ Public |
| 17 | FNorth Stanchfield LakeIsanti | F | 2.8 ft | 190.5 µg/L | 54.7 µg/L | No recent samples | 11 ft | Carry-in |
| NRFlorence LakeIsanti | NR | 8.9 ft | No recent samples | No recent samples | No recent samples | 26 ft | ✓ Public | |
| NRKrans LakeIsanti | NR | 1.5 ft | No recent samples | No recent samples | No recent samples | 31 ft | Carry-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.
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Other Counties in Minnesota
See how Isanti 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.