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.
Quick Answers for Anoka County
Planning a trip? Check special fishing regulations for Netta Lake, and the best times to fish — or browse the full Minnesota regulations index.
DNR Reports (46)
Minnesota DNR LakeFinder resources for lakes in Anoka County. Showing 12 most recent — browse all reports →
- —Fisheries Lake Survey — TypoFisheries Lake Survey · MN DNR LakeFinder
- —Fisheries Lake Survey — PeltierFisheries Lake Survey · MN DNR LakeFinder
- —Fisheries Lake Survey — West MooreFisheries Lake Survey · MN DNR LakeFinder
- —Fisheries Lake Survey — MartinFisheries Lake Survey · MN DNR LakeFinder
- —Fisheries Lake Survey — LinwoodFisheries Lake Survey · MN DNR LakeFinder
- —Fisheries Lake Survey — LaddieFisheries Lake Survey · MN DNR LakeFinder
- —Fisheries Lake Survey — HamFisheries Lake Survey · MN DNR LakeFinder
- —Fisheries Lake Survey — GoldenFisheries Lake Survey · MN DNR LakeFinder
- —Fisheries Lake Survey — GeorgeFisheries Lake Survey · MN DNR LakeFinder
- —Fisheries Lake Survey — East TwinFisheries Lake Survey · MN DNR LakeFinder
- —Fisheries Lake Survey — CrookedFisheries Lake Survey · MN DNR LakeFinder
- —Fisheries Lake Survey — CoonFisheries Lake Survey · MN DNR LakeFinder
All Lakes in Anoka County
| Rank | Lake | Grade | Clarity | Max Depth | Phosphorus |
|---|---|---|---|---|---|
| 1 | Netta Lake | A | 11.3 ft | - | 14.5 µg/L |
| 2 | East Twin Lake | B | 10.7 ft | 68 ft | 18.5 µg/L |
| 3 | Round Lake | B | 8.2 ft | - | 19 µg/L |
| 4 | Laddie Lake | B | - | 4 ft | 22 µg/L |
| 5 | Crooked Lake | B | 7.4 ft | 26 ft | 24 µg/L |
| 6 | Ham Lake | B | 8.9 ft | 22 ft | 22 µg/L |
| 7 | George Lake | C | 7.3 ft | 32 ft | 22 µg/L |
| 8 | Coon Lake | C | 5.6 ft | 27 ft | 23 µg/L |
| 9 | Boot Lake | C | 6.7 ft | 19 ft | 31 µg/L |
| 10 | Grass Lake | C | 3.9 ft | - | 23 µg/L |
| 11 | Linwood Lake | C | 3.9 ft | 42 ft | 42.5 µg/L |
| 12 | Howard Lake | C | 2.8 ft | - | 25 µg/L |
| 13 | Amelia Lake | C | 3.9 ft | - | 37 µg/L |
| 14 | Golden Lake | C | 5 ft | 25 ft | 56.5 µg/L |
| 15 | Moore Lake | C | 3.9 ft | 5 ft | 39 µg/L |
| 16 | Pickerel Lake | D | 5 ft | - | - |
| 17 | Martin Lake | D | 2.5 ft | 20 ft | 53.5 µg/L |
| 18 | Sandy Lake | D | 2.5 ft | - | 76 µg/L |
| 19 | Peltier Lake | F | 2 ft | 18 ft | 381.5 µg/L |
| 20 | Rice Lake | F | 2.3 ft | - | 128 µg/L |
| 21 | Typo Lake | F | 1 ft | 6 ft | 198 µg/L |
| 22 | Locke Lake | F | 3 ft | - | 107 µg/L |
| 23 | Centerville Lake | F | 2.8 ft | 19 ft | 99 µg/L |
| 24 | Marshan Lake | F | 1.2 ft | - | - |
Source: EPA National Aquatic Resource Surveys, 2026.