Gladwin County Lake Quality
Michigan, 10 lakes, average grade A (Excellent)
Only 10 lakes in Gladwin County carry an active grade. The county-level summary is therefore representative of those specific lakes, not necessarily of every water body in the county. The county's average grade is A — among the cleanest in Michigan. 4 lakes pull an A on their own, and almost none fall into the D or F brackets.
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. Lake Twenty (Aka (A) is the cleanest in the county.
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Quick Answers for Gladwin County
Planning a trip? Check special fishing regulations for Lake Twenty (Aka — or check the official Michigan fishing regulations.
All Lakes in Gladwin County
10 lakes · 4 graded, 6 not rated4 graded lakes · 6 not rated, hidden
| # | Lake | Grade | Clarity | Phosphorus | Algae | Trophic | Max Depth | Access |
|---|---|---|---|---|---|---|---|---|
| 1 | ALake Twenty (AkaGladwin | A | 8.5 ft | 20.5 µg/L | 2.7 µg/L | No recent samples | No recent samples | Not recorded |
| 2 | ALancelot Lake Southwest BasinGladwin | A | 9 ft | 15 µg/L | 3.5 µg/L | No recent samples | No recent samples | ✓ Public |
| 3 | ALancer Lake SoutheastGladwin | A | 12 ft | 18 µg/L | 1.5 µg/L | No recent samples | No recent samples | Not recorded |
| 4 | AIsland Lake Central Basin; Sherman TownshipGladwin | A | 16.5 ft | 7.5 µg/L | 2.4 µg/L | No recent samples | No recent samples | ✓ Public |
| NRLake LancelotGladwin | NR | 9 ft | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRLittle Lake TwentyGladwin | NR | 9 ft | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRLancelot Lake Central BasinGladwin | NR | 8 ft | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRLake LancerGladwin | NR | 11 ft | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRLancelot Lake Northeast BasinGladwin | NR | 9.5 ft | No recent samples | No recent samples | No recent samples | No recent samples | ✓ Public | |
| NRGrass LakeGladwin | NR | 4 ft | No recent samples | No recent samples | No recent samples | 8 ft | Not recorded |
NR = not rated: there is not enough recent sampling to support a letter. That is EPA Integrated Reporting Category 3 (insufficient information), not a failing grade. How grading works.
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Other Counties in Michigan
See how Gladwin County stacks up in the national county water-quality rankings, or browse the full directory of graded lakes across all 49 states and 2 Canadian provinces.
Source: EPA National Aquatic Resource Surveys, 2026.