Mary Lake
Crow Wing County, Minnesota, near Emily. DNR lake ID 18018500.
Mary Lake is a 412.6-acre lake in Crow Wing County, Minnesota, near Emily. Its deepest point reaches 34 ft, and about 31% of the lake is shallower than 15 feet. Summer water clarity averages 4.6 feet in Minnesota Pollution Control Agency monitoring, which places it in the eutrophic nutrient class. The DNR lists it for Eurasian watermilfoil. DNR surveys document walleye, northern pike, largemouth bass, black crappie, bluegill, yellow perch.
Buying or selling on Mary Lake? Ask us what lakeshore here actually sells for, which stretches of shoreline buyers compete for, and what’s coming up before it’s listed.
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Quick facts
| DNR lake ID | 18018500 |
|---|---|
| County | Crow Wing County, near Emily |
| Surface area | 412.6 acres |
| Maximum depth | 34 ft |
| Share under 15 ft | 31% |
| Water clarity (summer) | 4.6 ft through 2025 |
| Phosphorus (summer) | 24.1 µg/L |
| Algae, chlorophyll-a (summer) | 9.7 µg/L |
| Nutrient class | Eutrophic |
| Clarity trend | Clearer (2016 to 2025) |
| Invasive species | Eurasian watermilfoil |
| Public water accesses | 0 |
Water quality
Summer averages from Minnesota Pollution Control Agency monitoring through 2025: clarity 4.6 ft, phosphorus 24.1 µg/L, algae (chlorophyll-a) 9.7 µg/L. Using the Carlson trophic state index, Mary Lake rates as eutrophic. Summer clarity trend 2016 to 2025: clearer.
Fishing on Mary Lake
The most recent DNR standard fish survey was in 2012 (14 years ago). Catch per net is compared with the DNR’s typical range for lakes of the same type.
| Species | Net | Catch per net | Typical range |
|---|---|---|---|
| Walleye | gill | 0.33 | 1.3 to 5.0 |
| Walleye | trap | 0.56 | 0.3 to 0.7 |
| Northern pike | gill | 0.83 | 3.5 to 10.5 |
| Northern pike | trap | 0.22 | n/a |
| Yellow perch | gill | 5.5 | 3.4 to 43.6 |
| Yellow perch | trap | 0.33 | 0.5 to 3.3 |
| Black crappie | gill | 11.33 | 0.6 to 3.5 |
| Black crappie | trap | 15.89 | 0.7 to 3.4 |
| Bluegill | trap | 1.89 | 6.1 to 46.6 |
| Largemouth bass | trap | 0.22 | 0.3 to 1.3 |
Walleye catch was below the typical range for similar lakes in that survey.
Largest fish measured in recent DNR samples: Walleye 29.0 in (2012), Largemouth bass 17.0 in (2012), Northern pike 40.0 in (2012).
Game and panfish documented since 2005: Walleye, Northern pike, Largemouth bass, Black crappie, Bluegill, Yellow perch, Rock bass, Bowfin, White sucker, Yellow bullhead, Black bullhead.
Fishing regulations
No lake-specific regulation found in Minnesota Rules or the DNR sunfish list. Statewide and zone regulations apply.
Regulations change. Confirm with the DNR before fishing.
Invasive species
On the Minnesota DNR infested waters list for: Eurasian watermilfoil (listed 2017).
Public boat access
No public water access on DNR record.
Nearby lakes
- Emily Lake 1.7 mi, Crow Wing County
- Ruth Lake 1.8 mi, Crow Wing County
- Duck Lake 1.9 mi, Crow Wing County
- Dahler Lake 2.8 mi, Crow Wing County
- Trout Lake 3.1 mi, Crow Wing County
- Birchdale Lake 3.6 mi, Crow Wing County
- Little Emily Lake 3.7 mi, Crow Wing County
- Papoose Lake 3.7 mi, Crow Wing County
Questions about Mary Lake
How deep is Mary Lake?
Mary Lake reaches a maximum depth of 34 ft according to Minnesota DNR records. About 31% of the lake is shallower than 15 feet.
How big is Mary Lake?
Mary Lake covers about 412.6 acres in Crow Wing County, Minnesota.
How clear is Mary Lake?
Summer water clarity on Mary Lake averages 4.6 feet (Secchi depth) in MPCA monitoring through 2025. Its trophic state is eutrophic.
Does Mary Lake have zebra mussels or other invasive species?
The Minnesota DNR infested waters list includes Mary Lake for Eurasian watermilfoil.
What fish are in Mary Lake?
Minnesota DNR surveys document walleye, northern pike, largemouth bass, black crappie, bluegill, yellow perch, rock bass, bowfin, white sucker, yellow bullhead in Mary Lake. The most recent standard survey was in 2012.
How is the walleye population on Mary Lake?
In Minnesota DNR net surveys from 1998 to 2012, walleye numbers on Mary Lake ran mostly within the typical range for similar lakes. Nets measure how many fish a lake holds, not where they’re biting, so local guides are the best source for current fishing.
Are there lake homes for sale on Mary Lake?
Homes on Mary Lake come up for sale throughout the year, and some sell before they’re ever publicly advertised. Tell us what you’re looking for and our agents will run a custom search and send you matching homes on Mary Lake and nearby lakes, including off-market opportunities when available.
What is it like to live on Mary Lake?
A mid-size lake with room for boating and fishing, about 31% shallow shoreline under 15 feet, and summer clarity around 4.6 feet. Conditions vary by property, so walk the frontage and ask us what similar homes have sold for.
Are there special fishing regulations on Mary Lake?
No lake-specific regulation was found for Mary Lake in Minnesota Rules or the DNR sunfish list. Statewide and zone regulations apply.
Ask us about Mary Lake
Whether you’re buying, selling, or just curious, our team works Crow Wing County lakes every day. Send us a note or call (218) 656-6469.
Sources: Minnesota DNR LakeFinder records, DNR fish surveys (latest 2012), DNR infested waters list (Sept 2026), Minnesota Rules 6264.0400 (April 2026), MPCA monitoring via the Water Quality Portal, DNR water access records (2023), LAGOS-US. Lakewide information from public data; it does not describe any specific property. Verify shoreline, bottom type, and depth at any frontage.