Lake Mary
Iron County, Michigan263 acresView mapDirections
EGLE publishes the water-quality measurements for Lake Mary. Here is what has been measured.
- 48 ft max depth
- Public access
- Limited data
Lake Mary in Iron County, Michigan has water-quality measurements published by EGLE, shown here as reported. Water clarity: 19 ft visibility. Maximum depth: 48 ft. Surface area: 262.8 acres.
Free interactive depth-contour map of Lake Mary, reaching a maximum surveyed depth of 48 ft. Toggle Depth contours to overlay the bathymetric survey lines. Contour data from Michigan DNR.
Lake Mary is a 263-acre lake in Iron County, Michigan with a maximum depth of 48 feet. Water clarity is improving over recent sampling years. The lake supports 1 documented fish species including Walleye. Public access is available with 1 public boat landing.
Source: EPA Water Quality Portal sampling records, EGLE, last sampled 2022-09-14. Methodology: how these readings are compared.
Lake Mary covers about 260 acres in Iron County. It has one public boat landing. If you are planning to stay, you can search lake houses and cabins around Lake Mary on Vrbo, or look for a hotel room near the lake on Booking.com or Expedia.
What Lake Mary is good for
From access and monitoring records, not editorial picks.
- Clear water19 ft of visibility
- Boat launch1 documented ramp
- Deep water48 ft surveyed max depth
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Lake Mary 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 Mary
These are the measurements EGLE publishes for Lake Mary, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Crystal clear, you can see 19 ft down. TSI 35.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 19ft | 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. | 35 | Oligotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Low nutrients, clear water. No reading is a swimming clearance.
Ask about Lake Mary
Answers come straight from the public measurements and survey records on this page.
Lake Details
Max depth
48 ft
Surface area
263 acres
Public access
Yes
Listed by EGLE
Recreation & Access
- Lake MaryPublic
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 Mary
Compare lakeside cabins, hotels, and vacation rentals near Lake Mary in Iron 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 Mary
Prices for Oct 23–25, 4 adults. Change dates on the map below.
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Follow Lake Mary’s readings
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Fish Species
Click a species to see every lake where it is documented.
Fishing Lake Mary
Water Quality Trend: Stable
Based on 7 years of monitoring (2016–2023).
Water clarity
Improving7 years
Phosphorus
Worsening+0.24 µg/L/yr7 years
Chlorophyll-a
Stable-0.06 µg/L/yr7 years
Nearby Lakes in Iron County
Frequently asked questions about Lake Mary
Where is Lake Mary?
- Lake Mary is a lake in Iron County, Michigan. Its water-quality measurements are published by EGLE and shown on this page as reported.
What is the water quality of Lake Mary?
- Lake Mary in Iron County, Michigan has water-quality measurements published by EGLE, shown here as reported. Water clarity: 19 ft visibility. Maximum depth: 48 ft. Surface area: 262.8 acres.
Is Lake Mary safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
How deep is Lake Mary?
- Lake Mary has a maximum depth of 48 feet. The lake covers 262.8 acres.
What fish are in Lake Mary?
- Fish species found in Lake Mary include Walleye. Lake Mary is located in Iron County, Michigan.
Are there boat ramps on Lake Mary?
- Lake Mary has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Lake Mary. Public access is listed as yes.
Can I fish at Lake Mary?
- Lake Mary 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 Mary across LakeQuality
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Where this data comes from
95 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
NALMS95 samples · 2016–2022
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
Named boat-access points from the USGS National Boat Ramps inventory