Lake Ann
Lake Ann in Benzie County, Michigan is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 14.5 ft visibility. Maximum depth: 75 ft. Surface area: 532.3 acres.
- Clarity
- 14.5 ft
- Max depth
- 75 ft
- Area
- 532 acres
- Trend
- → Stable
- Public access
- Yes
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Free interactive depth-contour map of Lake Ann, reaching a maximum surveyed depth of 75 ft. Toggle Depth contours to overlay the bathymetric survey lines. Contour data from Michigan DNR.
Why Lake Ann 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 Lake Ann, 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.
Lake Ann is a 532-acre lake in Benzie County, Michigan with a maximum depth of 75 feet. Water clarity is improving over recent sampling years. The lake supports 10 documented fish species including Bluntnose minnow, Common shiner, and Creek chub. Public access is available with 1 public boat landing.
Source: EPA Water Quality Portal sampling records, EGLE, last sampled 2023-06-24. 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 Lake Ann
These readings exist but are not enough for an A–F grade — see why.
Good clarity, visible to about 14.5 ft. Trophic State Index: 39.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 14.5 ft | Not graded |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 39 | Oligotrophic |
Low nutrients, clear water, excellent for swimming
Where to stay near Lake Ann
Compare lakeside cabins, hotels, and vacation rentals near Lake Ann in Benzie 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 Lake Ann
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Planning a whole trip? See where to stay at Michigan’s top lakes →
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 75 ft |
| Surface Area | 532 acres |
| Public Access | Yes |
Recreation & Access
- Lake Ann State Forest CampgrondPublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Fish Species
Click a species to see every graded lake where it is documented.
Fishing Lake Ann
Water Quality Trend: → Stable
Based on 8 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.575 m/yr | 8 |
| Phosphorus | → Stable | +0.11 µg/L/yr | 7 |
| Chlorophyll-a | ↓ Declining | +0.07 µg/L/yr | 7 |
EPA Impairment Status
Lake Ann 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 MI040601040202-01 · Official waterbody report
Regulated Pollution Sources Nearby
1 EPA-permitted facility operate within about 5 miles of Lake Ann under Clean Water Act (NPDES) discharge permits.
- B & M Party StoreLake Ann · 0.6 mi away · NPDES MIG080991
Facilities permitted to discharge under the Clean Water Act within ~5 miles; proximity does not by itself mean a facility affects this lake. Source: EPA ECHO (ICIS-NPDES), as of 2026-07.
Graded lakes near Lake Ann
Lake Ann has no grade, but these lakes within a short drive do.
Nearby Lakes in Benzie County
Frequently asked questions about Lake Ann
Where is Lake Ann?
- Lake Ann is a lake in Benzie 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 Lake Ann?
- Lake Ann in Benzie County, Michigan is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 14.5 ft visibility. Maximum depth: 75 ft. Surface area: 532.3 acres.
Is Lake Ann safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Lake Ann 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 Lake Ann?
- Lake Ann has a maximum depth of 75 feet. The lake covers 532.3 acres.
What fish are in Lake Ann?
- Fish species found in Lake Ann include Bluntnose minnow, Common shiner, Creek chub, Hornyhead chub, Lake herring, Mimic shiner, Northern longear sunfish, Rock bass, Rosyface shiner, Sand shiner. Lake Ann is located in Benzie County, Michigan.
Are there boat ramps on Lake Ann?
- Lake Ann has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Lake Ann State Forest Campgrond. Public access is listed as yes.
Explore Lake Ann across LakeQuality
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Planning a trip around Sleeping Bear Dunes?
Lake Ann is about 17 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
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Where this data comes from
127 measurements from 1 monitoring station, 2016–2023. Retrieved from the EPA Water Quality Portal on 2026-08-26.
Collected and reported by
- North American Lake Management Society
NALMS127 samples · 2016–2023
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
Regulated discharger data from EPA ECHO (ICIS-NPDES)
Named boat-access points from the USGS National Boat Ramps inventory