Town Line Lake
Otsego County, Michigan31 acresView mapDirections
Not Rated: one monitoring station are on record, but they measured water clarity only. LakeQuality’s A–F method grades total phosphorus, total nitrogen, chlorophyll-a, and turbidity; clarity is shown, not scored.
- 44 ft max depth
- Public access
- Limited data
Town Line Lake in Otsego County, Michigan is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 18 ft visibility. Maximum depth: 44 ft. Surface area: 31.2 acres.
- Clarity
- 18 ft
- Max depth
- 44 ft
- Area
- 31 acres
- Trend
- → Stable
- Public access
- Yes
Stays via Stay22
Stays near Town Line Lake
Compare lakeside cabins, hotels, and vacation rentals near Town Line Lake in Otsego 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 Town Line Lake
Prices for Sep 11–13, 4 adults. Change dates on the map below.
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 →
Watch Town Line Lake’s letter
Email me if this lake’s grade moves. Grades stay free.
Or email
Free interactive depth-contour map of Town Line Lake, reaching a maximum surveyed depth of 44 ft. Toggle Depth contours to overlay the bathymetric survey lines. Contour data from Michigan DNR.
Why Town Line Lake has no grade
Town Line Lake has monitoring on record from one station, but only water clarity was measured. LakeQuality’s A–F letter uses total phosphorus, total nitrogen, chlorophyll-a, and turbidity against EPA National Lakes Assessment condition classes. With none of those grading measurements on record, Town Line Lake is Not Rated — not an F. Its 18-foot median from 54 readings collected 2017–2021 is still shown as clarity, but clarity alone cannot earn a letter.
Not Rated is EPA Integrated Reporting Category 3 — insufficient information. 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.
Town Line Lake is a 31-acre lake in Otsego County, Michigan with a maximum depth of 44 feet. Limited fish-species data available. Public access is available.
Source: EPA Water Quality Portal sampling records, EGLE, last sampled 2021-09-12. Grade methodology: LakeQuality methodology.
What Town Line Lake is good for
From access and monitoring records, not editorial picks.
- Clear water18 ft of visibility
- Deep water44 ft surveyed max depth
Swimming Safety
Not ratedLimited data
The letter is not a swimming clearance. Check local advisories before you swim.
Water quality measurements for Town Line Lake
These readings exist but are not enough for an A–F grade — see why.
Crystal clear, you can see 18 ft down. TSI 35.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 18 ft | Not graded |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 35 | Oligotrophic |
Low nutrients, clear water. The letter is not a swimming clearance.
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 44 ft |
| Surface Area | 31 acres |
| Public Access | Yes |
Fishing Town Line Lake
Water Quality Trend: → Stable
Based on 4 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | → Stable | -0.073 m/yr | 4 |
| Phosphorus | → Stable | 0 µg/L/yr | 3 |
Graded lakes near Town Line Lake
Town Line Lake has no grade, but these lakes within a short drive do.
Nearby Lakes in Otsego County
Frequently asked questions about Town Line Lake
Where is Town Line Lake?
- Town Line Lake is a lake in Otsego County, Michigan. LakeQuality has not rated this lake (UNRATED) — 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.
What is the water quality grade for Town Line Lake?
- Town Line Lake in Otsego County, Michigan is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 18 ft visibility. Maximum depth: 44 ft. Surface area: 31.2 acres.
Is Town Line Lake safe to swim in?
- The letter is not a swimming clearance. Check local advisories before you swim.
How deep is Town Line Lake?
- Town Line Lake has a maximum depth of 44 feet. The lake covers 31.2 acres.
Explore Town Line Lake across LakeQuality
Fish species and top-graded lakes across Michigan
Fish species and best lakes in Otsego 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
Oligotrophic Lakes in Michigan
Where this data comes from
54 measurements from 1 monitoring station, 2017–2021. Retrieved from the EPA Water Quality Portal on 2026-08-26.
Collected and reported by
- North American Lake Management Society
NALMS54 samples · 2017–2021
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.