Mack Lake
Mack Lake in Oscoda County, Michigan is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 5.5 ft visibility. Surface area: 160.9 acres.
- Clarity
- 5.5 ft
- Area
- 161 acres
- Trend
- ↓ Declining
Next lake in Oscoda County
Swipe left or right on this bar to open the next or previous lake.
Why Mack Lake has no grade
We grade a lake only when the monitoring record supports a letter: at least three phosphorus or chlorophyll-a samples in the last ten years, scored against EPA National Lakes Assessment thresholds for this lake’s ecoregion. For Mack Lake, the only measurement available is water clarity, which is not a water-quality indicator on its own — EPA's National Lakes Assessment does not grade clarity. Sampling here has recorded water clarity, but not phosphorus and algae (chlorophyll-a).
Not Rated is not an F. It is EPA Integrated Reporting Category 3 — insufficient information. The water here may be excellent or poor; nobody has measured enough of it to say. Everything below that has been measured is still reported on this page.
Sampling is run by EGLE and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Mack Lake is a 161-acre lake in Oscoda County, Michigan. Overall water quality is declining over recent sampling years. The lake supports 6 documented fish species including Black bullhead, Bluntnose minnow, and Finescale dace.
Source: EPA Water Quality Portal sampling records, EGLE, last sampled 2019-08-22. Grade methodology: LakeQuality methodology.
Watch Mack Lake water quality
Subscribe for LakeQuality updates by email. No spam, unsubscribe anytime.
Swimming Safety
Not ratedLimited data
Not rated for swimming — there is not enough monitoring data to judge this lake
Water quality measurements for Mack Lake
These readings exist but are not enough for an A–F grade — see why.
Murky, only visible to about 5.5 ft. Trophic State Index: 53.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 5.5 ft | Not graded |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 53 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Mack Lake
Compare lakeside cabins, hotels, and vacation rentals near Mack Lake in Oscoda County, Michigan — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water.
Top-rated places to stay near Mack Lake
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Planning a whole trip? See where to stay at Michigan’s top lakes →
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 161 acres |
The available depth estimate for Mack Lake is shallower than its measured water clarity, which cannot be right, so no depth is shown.
Fish Species
Click a species to see every graded lake where it is documented.
Fishing Mack Lake
Water Quality Trend: ↓ Declining
Based on 2 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Phosphorus | ↓ Declining | +2 µg/L/yr | 2 |
Graded lakes near Mack Lake
Mack Lake has no grade, but these lakes within a short drive do.
Nearby Lakes in Oscoda County
Frequently asked questions about Mack Lake
Where is Mack Lake?
- Mack Lake is a lake in Oscoda County, Michigan. LakeQuality has not rated this lake (UNRATED) — there is not enough recent sampling to assign a letter.
What is the water quality grade for Mack Lake?
- Mack Lake in Oscoda County, Michigan is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 5.5 ft visibility. Surface area: 160.9 acres.
Is Mack Lake safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Mack Lake is not rated for water quality — its monitoring record does not meet the evidence bar. Always check local health department advisories before swimming.
How deep is Mack Lake?
- The available depth estimate for Mack Lake is shallower than its measured water clarity, which cannot be right, so no depth is shown. The lake covers 160.9 acres.
What fish are in Mack Lake?
- Fish species found in Mack Lake include Black bullhead, Bluntnose minnow, Finescale dace, Golden shiner, Western banded killifish, Yellow perch. Mack Lake is located in Oscoda County, Michigan.
Explore Mack Lake across LakeQuality
Fish species and top-graded lakes across Michigan
Fish species and best lakes in Oscoda County
Species activity outlook by water temperature and season
Where to stay at Michigan's top lakes, each with its grade
Michigan's cleanest and most-polluted lakes, ranked
More Michigan Lake Rankings
Other Lakes in Michigan
Eutrophic Lakes in Michigan
Where this data comes from
8 measurements from 1 monitoring station, 2019. Retrieved from the EPA Water Quality Portal on 2026-08-26.
Collected and reported by
- North American Lake Management Society
NALMS8 samples · 2019
Monitoring station identifiers (1)
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See how grades are calculated and data sources.