Lake Mary
Lake Mary in Kenosha County, Wisconsin has a water quality grade of B (Good). Water clarity: 6.4 ft visibility. Phosphorus: 15.5 µg/L. Maximum depth: 33 ft. Surface area: 327 acres.
- Clarity
- 6.4 ft
- Max depth
- 33 ft
- Area
- 327 acres
- Type
- Mesotrophic
- Trend
- ↑ Improving
- Public access
- Yes
Next lake in Kenosha County
Lake Mary is a 327-acre mesotrophic lake in Kenosha County, Wisconsin with a maximum depth of 33 feet. Water quality is graded B based on 1 sampling years through 2026. Overall water quality is improving over recent sampling years. The lake supports 4 documented fish species including Panfish, Largemouth Bass, and Northern Pike. Public access is available with 3 public boat landings. Compared to the 7 other monitored lakes in Kenosha County, Lake Mary ranks #6 for water quality.
Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2026-05-21. Grade methodology: LakeGrade methodology.
Watch Lake Mary water quality
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Swimming Safety
Grade onlyLow algae
Based on clarity and algae grades from past sampling — we do not hold live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
Good for swimming, clear water with low algae levels
Water Quality Grade: B (Good)
Murky, only visible to about 6.4 ft. Phosphorus level: 15.5 µg/L. Trophic State Index: 47.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 6.4 ft | Not graded |
| Phosphorus | 15.5 µg/L | Good |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 47 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Lake Mary
Compare lakeside cabins, hotels, and vacation rentals near Lake Mary in Kenosha County, Wisconsin — 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 Mary
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Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 33 ft |
| Surface Area | 327 acres |
| Public Access | Yes |
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS).
Recreation & Access
- Lance Memorial ParkPublic
- Musial RoadPublic
- East Lakeshore DriveSemi-private
Fish Species
Click a species to see every graded lake where it is documented.
Fishing Lake Mary
Invasive & Introduced Species
Red chips are ecologically harmful invasive species. Gray chips are stocked or introduced fish that aren't a current ecological concern.
WI DNR Lake Profile
Authoritative data from the Wisconsin DNR LakePages. 1 station on file (most recent sample 2025).
Fish Species (DNR-rated)
Water Quality Trend: ↑ Improving
Based on 5 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.621 m/yr | 5 |
| Phosphorus | ↑ Improving | -1.23 µg/L/yr | 5 |
Regulated Pollution Sources Nearby
3 EPA-permitted facilities operate within about 5 miles of Lake Mary under Clean Water Act (NPDES) discharge permits, including 1 classified by the EPA as major discharger. 2 facilities have a reported Clean Water Act violation in the past three years.
- Twin Lakes Wastewater Treatment FacTwin Lakes · 1.4 mi away · NPDES WI0021695MajorRecent violation
- Richmond Stp, Village OfRichmond · 4 mi away · NPDES IL0026093Recent violation
- Silver Lake VillageSilver Lake · 1.4 mi away · NPDES WI0020851
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.
County Ranking
Ranked #6 of 8 lakes in Kenosha County
Nearby Lakes With Higher Grades
Lake Mary holds Grade B. One nearby lake has a higher nutrient-and-algae grade — useful for a swim day, not a reason to skip lodging here.
See full comparison →Nearby Lakes in Kenosha County
Frequently asked questions about Lake Mary
What is the water quality grade for Lake Mary?
- Lake Mary in Kenosha County, Wisconsin has a water quality grade of B (Good). Water clarity: 6.4 ft visibility. Phosphorus: 15.5 µg/L. Maximum depth: 33 ft. Surface area: 327 acres.
Is Lake Mary safe to swim in?
- Good for swimming, clear water with low algae levels. Lake Mary has a water quality grade of B (Good). Always check local health department advisories before swimming.
How deep is Lake Mary?
- Lake Mary has a maximum depth of 33 feet. The lake covers 327 acres.
What fish are in Lake Mary?
- Fish species found in Lake Mary include Panfish, Largemouth Bass, Northern Pike, Walleye. Lake Mary is located in Kenosha County, Wisconsin.
Are there boat ramps on Lake Mary?
- Lake Mary has 3 documented boat landings in the USGS National Boat Ramps inventory. Named access points include Lance Memorial Park, Musial Road, East Lakeshore Drive. Public access is listed as yes.
Explore Lake Mary across LakeGrade
Depth, room, public access, and the state wake-sport rules
Fish species and top-graded lakes across Wisconsin
Fish species and best lakes in Kenosha County
Species activity outlook by water temperature and season
Where to stay at Wisconsin's top lakes, each with its grade
Moderate nutrients, good water quality
Wisconsin's cleanest and most-polluted lakes, ranked
More Wisconsin Lake Rankings
State Parks Near Lake Mary
Other Grade B Lakes in Wisconsin
Mesotrophic Lakes in Wisconsin
Where this data comes from
41 measurements from 1 monitoring station, 2021–2026. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Wisconsin Department of Natural Resources
WIDNR_WQX41 samples · 2021–2026
Analytical methods
- Phosphorus by Colorimetry
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
Regulated discharger data from EPA ECHO (ICIS-NPDES)
Lake size & watershed from HydroLAKES (HydroSHEDS)
Fish and recreation data from Wisconsin DNR Lakes
Named boat-access points from the USGS National Boat Ramps inventory