Lake Ann
Benzie County, Michigan532 acresView mapDirections
EGLE publishes the water-quality measurements for Lake Ann. Here is what has been measured.
- Impaired · Mercury
- 75 ft max depth
- Public access
- Limited data
Lake Ann in Benzie County, Michigan has water-quality measurements published by EGLE, shown here as reported. Water clarity: 14.5 ft visibility. Maximum depth: 75 ft. Surface area: 532.3 acres.
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.
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. Methodology: how these readings are compared.
Lake Ann covers about 530 acres in Benzie County. It has one public boat landing. Vrbo is where to look for cabins and lake homes around Lake Ann, and Booking.com and Expedia search hotels near the lake for your dates.
What Lake Ann is good for
From access and monitoring records, not editorial picks.
- Clear water14.5 ft of visibility
- Boat launch1 documented ramp
- Fishing10 species recorded
- Deep water75 ft surveyed max depth
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Lake Ann is listed impaired under Clean Water Act §303(d) (IR 5) for mercury, oxygen depletion (low DO). Check local advisories before you swim.
Whether Lake Ann is safe to swim in today is a call for the Michigan Department of Environment, Great Lakes, and Energy (EGLE) and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Lake Ann
These are the measurements EGLE publishes for Lake Ann, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Good clarity, visible to about 14.5 ft. TSI 39.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 14.5ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | No reading The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. | |
| Chlorophyll-a (algae) | No reading The green pigment in algae — a direct measure of how much algae is in the water. | |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 39 | Oligotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Low nutrients, clear water. No reading is a swimming clearance.
Ask about Lake Ann
Answers come straight from the public measurements and survey records on this page.
Lake Details
Max depth
75 ft
Surface area
532 acres
Public access
Yes
Listed by EGLE
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
Stays via Stay22
Stays 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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Fish Species
Click a species to see every lake where it is documented.
Fishing Lake Ann
Water Quality Trend: Stable
Based on 8 years of monitoring (2016–2023).
Water clarity
Improving8 years
Phosphorus
Stable+0.11 µg/L/yr7 years
Chlorophyll-a
Worsening+0.07 µg/L/yr7 years
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
Designated uses not supporting: Aquatic life, Fish consumption.
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.
Nearby Lakes in Benzie County
Frequently asked questions about Lake Ann
Where is Lake Ann?
- Lake Ann is a lake in Benzie County, Michigan. Its water-quality measurements are published by EGLE and shown on this page as reported.
What is the water quality of Lake Ann?
- Lake Ann in Benzie County, Michigan has water-quality measurements published by EGLE, shown here as reported. Water clarity: 14.5 ft visibility. Maximum depth: 75 ft. Surface area: 532.3 acres.
Is Lake Ann safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Lake Ann is listed impaired under Clean Water Act §303(d) (IR 5) for mercury, oxygen depletion (low DO). Check local advisories before you swim.
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.
Can I fish at Lake Ann?
- Lake Ann has 1 documented boat landing in the USGS National Boat Ramps inventory. Seasons, size and bag limits, and whether you need a license are set by Michigan's fish and wildlife agency, so check its current regulations before you go.
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.
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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)
EPA condition classes from the National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See where the data comes from 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