Ogemaw County Lake Quality
Michigan, 3 lakes, average grade A (Excellent)
Ogemaw County has 3 graded lakes — a thin enough sample that one or two stressed lakes can move the county average noticeably. Use the per-lake pages below for what actually matters. On average, Ogemaw County lakes grade an A. That puts it near the top of the Michigan county ranking.
Many of the county's lakes are deep glacial basins — over 50 feet at their deepest point — which gives them thermal stratification and a buffer against summer warming. Au Sable Lake (grade A) is the cleanest in the county.
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Quick Answers for Ogemaw County
Planning a trip? Check special fishing regulations for Au Sable Lake, whether the fish are safe to eat, and the best times to fish — or check the official Michigan fishing regulations.
Fishing in Ogemaw County
All Lakes in Ogemaw County
3 lakes · 1 graded, 2 not rated1 graded lake · 2 not rated, hidden
| # | Lake | Grade | Clarity | Phosphorus | Algae | Trophic | Max Depth | Access |
|---|---|---|---|---|---|---|---|---|
| 1 | AAu Sable LakeOgemaw | A | 10.5 ft | 10 µg/L | 3.3 µg/L | No recent samples | 52 ft | ✓ Public |
| NRClear LakeOgemaw | NR | 15 ft | No recent samples | No recent samples | No recent samples | 50 ft | ✓ Public | |
| NRRifle LakeOgemaw | NR | No recent samples | 24.5 µg/L | No recent samples | No recent samples | 70 ft | ✓ Public |
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.
Lake Match
Which lake suits how you actually use one?
Six questions — swimming, fishing, quiet, cabins, drive time — and a shortlist of graded lakes that fit, with the water quality behind each one.
Other Counties in Michigan
See how Ogemaw 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.