Lake Ann is a cold, clear oligotrophic lake in Benzie County, Michigan. Water quality is graded B based on 1 sampling years through 2023. Overall water quality 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. Compared to the 34 other monitored lakes in Benzie County, Lake Ann ranks #19 for water quality.
Source: EPA Water Quality Portal sampling records, Michigan DNR, last sampled 2023-06-24. Grade methodology: LakeGrade methodology.
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Swimming Safety
Good for swimming, clear water with low algae levels
Water Quality Grade: B, Good
Good clarity, visible to about 13.8 ft. Trophic State Index: 39.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 13.8 ft | B |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 39 | Oligotrophic |
Low nutrients, clear water, excellent for swimming
Where to stay near Lake Ann
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Fish Species
Click a species to see every graded lake where it is documented.
Fishing Lake Ann
Water Quality Trend: ↑ Improving
Based on 4 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +1.44 m/yr | 4 |
| Chlorophyll-a | ↑ Improving | -0.3 µg/L/yr | 3 |
Recreation & Access
Location & Depth Map
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.
County Ranking
Ranked #19 of 35 lakes in Benzie County
Cleaner Lakes Within 30 Miles
Lake Ann holds Grade B. 3 nearby lakes hold higher grades.
Nearby Lakes in Benzie County
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Low nutrients, clear water, excellent for swimming
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Other Grade B Lakes in Michigan
Leelanau County · Clarity: 12.5 ft
Leelanau County · Clarity: 9 ft
Leelanau County · Clarity: 13 ft
Leelanau County · Clarity: 11.8 ft
Leelanau County · Clarity: 8.5 ft
Grand Traverse County · Clarity: 13.5 ft
Oligotrophic Lakes in Michigan
More records, surveys & data sources
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
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth is a modeled estimate.
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.
Data Sources
Water quality data from the EPA Water Quality Portal
Impairment status from EPA ATTAINS 303(d) database
Regulated discharger data from EPA ECHO (ICIS-NPDES)
Lake size & watershed from HydroLAKES (HydroSHEDS)
Grading methodology based on Metropolitan Council standards
Public boat-access points from the USGS National Boat Ramps inventory
Most recent sample: 2023-06-24
Monitoring stations: 1