Glen Lake
Glen Lake in Leelanau County, Michigan is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 16 ft visibility. Maximum depth: 130 ft. Surface area: 6289 acres.
- Clarity
- 16 ft
- Max depth
- 130 ft
- Area
- 6,289 acres
- Trend
- ↑ Improving
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Free interactive depth-contour map of Glen Lake, reaching a maximum surveyed depth of 130 ft. Toggle Depth contours to overlay the bathymetric survey lines. Contour data from Michigan DNR.
Why Glen 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 Glen 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.
Glen Lake is a 6,289-acre lake in Leelanau County, Michigan with a maximum depth of 130 feet. Overall water quality is improving over recent sampling years. The lake supports 1 documented fish species including Lake herring.
Source: EPA Water Quality Portal sampling records, EGLE, last sampled 2022-09-14. Grade methodology: LakeQuality methodology.
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Swimming Safety
Not ratedLimited data
Not rated for swimming — there is not enough monitoring data to judge this lake
Water quality measurements for Glen Lake
These readings exist but are not enough for an A–F grade — see why.
Crystal clear, you can see 16 ft down. Trophic State Index: 37.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 16 ft | Not graded |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 37 | Oligotrophic |
Low nutrients, clear water, excellent for swimming
Where to stay near Glen Lake
Compare lakeside cabins, hotels, and vacation rentals near Glen Lake in Leelanau 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 Glen Lake
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Planning a whole trip? See where to stay at Michigan’s top lakes →
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 130 ft |
| Surface Area | 6,289 acres |
Fish Species
Click a species to see every graded lake where it is documented.
Fishing Glen Lake
Water Quality Trend: ↑ Improving
Based on 8 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +1.243 m/yr | 8 |
| Phosphorus | ↑ Improving | -0.25 µg/L/yr | 7 |
| Chlorophyll-a | → Stable | 0 µg/L/yr | 7 |
EPA Impairment Status
Glen Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).
Causes of impairment
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit MI040601040402-01 · Official waterbody report · Matched by proximity (0.94 km)
Graded lakes near Glen Lake
Glen Lake has no grade, but these lakes within a short drive do.
Nearby Lakes in Leelanau County
Frequently asked questions about Glen Lake
Where is Glen Lake?
- Glen Lake is a lake in Leelanau 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 Glen Lake?
- Glen Lake in Leelanau County, Michigan is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 16 ft visibility. Maximum depth: 130 ft. Surface area: 6289 acres.
Is Glen Lake safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Glen 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 Glen Lake?
- Glen Lake has a maximum depth of 130 feet. The lake covers 6289 acres.
What fish are in Glen Lake?
- Fish species found in Glen Lake include Lake herring. Glen Lake is located in Leelanau County, Michigan.
Explore Glen Lake across LakeQuality
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Planning a trip around Sleeping Bear Dunes?
Glen Lake is about 5 miles from Sleeping Bear Dunes National Lakeshore. Crowds there swing hard by season, so the month you pick changes both how busy the park is and what lodging costs.
Best time to visit Sleeping Bear Dunes →More Michigan Lake Rankings
Other Lakes in Michigan
Oligotrophic Lakes in Michigan
Where this data comes from
224 measurements from 1 monitoring station, 2016–2022. Retrieved from the EPA Water Quality Portal on 2026-08-26.
Collected and reported by
- North American Lake Management Society
NALMS224 samples · 2016–2022
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.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database