Mary Lake

Dickinson County, Michigan · MI DNR bathymetric survey

80ft Max
depth

87 acres 9 contours Public access

Paddling Index44ModestMedium confidencesheltered geometry

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Depth scale

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The lake

Survey readout

Mary Lake is mapped to a depth of 80 ft on the Michigan DNR survey and covers about 87 acres in Dickinson County, Michigan.

Measured from the Michigan DNR inland-lake contour survey (depths read from the survey's isobath field; this lake's summary-depth column is blank in the source).

Deepest mapped contour: 80 ft
Mean depth: 22.6 ft · estimated
Surface area: 87 acres
Estimated volume: 1,965 acre-ft · 640M gal
Shoreline: 1.5 mi · round
Aquatic vegetation: 6% of surface · NDVI estimate
Public access: Boat Launch

Additional depth details9 contours

Contour depths: 0–80 ft
Recorded point soundings: 80 ft

41.8% of the surface sits over water shallower than 10 ft; 47.7% is deeper than 20 ft. Depth, area and volume are estimated from the interpolated survey surface — historical reference, not measurement.

Compare with another lake

Location

Dickinson County, Michigan · all 15 lakes · tap a dot for that lake

Chart data

Provenance

Sources: MI DNR inland lake contours, USGS 3DEP, USDA NAIP (public domain), OpenStreetMap (ODbL), MI DNR Boat Launches.

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Map details & sources5 sources

All layers registered to one bounding box; positions in WGS 84.

Survey-derived depth contours drape over USGS 3DEP elevation, with a USDA NAIP aerial basemap and OpenStreetMap shoreline. Colour shows surveyed depth; dark lines are the survey's own isobaths.

Coordinates: 45.75120, -87.81971
MI DNR lake ID: L43135
Vertical exaggeration: 1.4×
Basemap: USDA NAIP · public domain
Model size: 2.2 MB

Paddling

Paddling Index methodology v1.0 · calculated 2026-08-21

44 / 100ModestData confidence: Medium

Mary Lake has a substantially developed setting, well sheltered geometry, some nearby classified roads. No special watercraft restriction is identified in the current source.

Why this score?5 components

Included in the index

Component	Rating	Points of weight	Measurement
Natural setting	Modest	0.7 of 35	25% natural land cover within 150 m of shore (14% forest, 7% wetland; 70% developed)
Geometric wind exposure	Excellent	25.4 of 29	mean fetch 580 m · 18% of sampled water within 500 m of shelter · short fetch in most directions
Watercraft controls	None identified	8.8 of 18	No special watercraft restriction identified in the current DNR source. Motors permitted, subject to general law.
Public access	Not listed	—	No DNR-listed access site. Township, county and road-end launches are not in this source, so this is not evidence that access is poor — the component is excluded and the remaining weights are renormalized.
Road isolation	Good	9.3 of 18	some nearby classified roads · 11 MDOT-classified segments within 1.2 km, peak 982 vehicles/day

Additional paddling considerations

These describe the lake but are not part of the v1 Paddling Index and do not change the number above.

Wake sensitivity: Low — wide enough that wakes disperse over most of the lake
Aquatic vegetation: Low — approximately 6% mapped coverage · NAIP aerial imagery (NDVI)
Observed motorized activity: Unknown — No lake-level measurement of boat traffic is available. Legal permission to operate motors is not evidence of use.
Wildlife habitat potential: Limited — 14% forest and 7% wetland cover within 150 m of shore

Compare Michigan lakes by Paddling Index →

How this index is calculated. The Paddling Index is a relative composite derived from lake geometry and public environmental, access, roadway and watercraft-control data. It is not a user review, a safety rating, or a prediction of an individual outing. Differences of a few points should not be treated as meaningful — an 84 and an 82 are broadly comparable. Components and weights: natural setting 30%, geometric wind exposure 25%, watercraft controls 15%, public access 15%, road isolation 15%; observed motorboat activity is weighted 0% because no defensible lake-level measurement exists. Where a component has no data the remaining weights are renormalized and the confidence rating is lowered; below Medium confidence no number is shown. Sources: MI DNR Watercraft Control Areas (2026-08), USGS/MRLC NLCD Land Cover (2021), MDOT Annual Average Daily Traffic (2025) and MI DNR bathymetric survey outline (0 ft isobath). Conditions change quickly — check current weather and local conditions before going out.

Fish you might catch

from angler catches & active stocking

2 species with recent evidence in this lake — sized relative to each other. Illustrations are AI-generated representative adults in everyday colours, not photographs (provenance).

Largemouth Bass

Crappie

Historically stocked, no recent evidence: Walleye (last planted 2002) — not shown above.

Fishing rules for this lake Beta

Size and daily limits for the 2 species found here — 2 open to harvest.

These are hook-and-line size, daily limit and season rules. Gear, spearing and bow fishing, spawning closures and rod limits are set by other Fisheries Orders and are not shown here.

CrappieOpen to harvestMinimum size: no size limit · Daily limit: 25 (FO-215 · statewide inland) The 25 is in any combination of the sunfishes — Bluegill, Pumpkinseed, Black and White Crappie, Rock Bass, Green, Longear and Redear Sunfish, Warmouth and hybrids — not 25 of each (FO-215.23A).

Largemouth BassOpen to harvestMinimum size: 14" · Daily limit: 5 (FO-215 · statewide inland) The 5 is in any combination of Largemouth and Smallmouth Bass, not 5 of each (FO-215.23A).

Beta. This panel is newly published. Every value is parsed from the Michigan DNR fisheries orders and hand-checked against the printed digest, but the coverage and wording are still under review. If anything here disagrees with the Michigan DNR's Fisheries Orders or its printed digest, the DNR is right — the signed Fisheries Order is the legal text; the digest summarises it.

Largemouth BassOpen to harvestMinimum size: 14" · Daily limit: 5 (FO-215 · statewide inland) The 5 is in any combination of Largemouth and Smallmouth Bass, not 5 of each (FO-215.23A).

Official rule text for this lake

“no size limit on Northern Pike and up to five (5) Northern Pike may be retained in the daily possession limit with only one (1) 24-inches or greater. (Norway Lake and Rock Lake waters shall expire on September 15, 2028).” — FO-206

From FO-206.26 (eff. 2026-04-01) / FO-215.23A (eff. 2023-09-15) / FO-254.25 (eff. 2025-10-10), checked against the 2026 Michigan Fishing Regulations digest · verified 2026-08-24. Regulations can change — Michigan DNR rules are the controlling source; verify current regulations before fishing. Official regulations

Compiled from registered Master Angler catches and Michigan DNR stockings within the last 10 years. Silhouettes are stylized and scaled to typical adult sizes relative to one another. Presence is not a promise — fishing isn’t a sure thing.

Notable catches

Master Angler program · 2010–2025

Trophy-size fish anglers caught here and registered with the DNR — what people have actually caught, distinct from what a survey netted or the state stocked below.

5Catches recorded

2Species

Crappie4 recorded · to 16.5″ · latest 2025

Largemouth Bass1 recorded · to 21.8″ · latest 2025

Biggest on record

Largemouth Bass21.8″ · 2025 · ice fishing · live bait

Crappie16.5″ · 2025 · ice fishing · live bait

Crappie16″ · 2010 · trolling

Crappie15.5″ · 2012 · ice fishing · wax worm

Crappie14.1″ · 2021 · spincasting · live bait

Bait: live bait (3) · wax worm (1)
Method: ice fishing (3) · spincasting (1) · trolling (1)

Master Angler entries are fish that met the program’s minimum size and were registered by the angler — they show what this lake has produced, not what a day here will produce. A catch on record is history, not a species listing: “Fish you might catch” lists only species with current evidence. Source: Michigan DNR Master Angler data.

DNR stocking

state stocking record · 1983–2002

Fish the Michigan DNR has planted in this lake — what was added, distinct from what a survey netted above.

Walleye37,462 stocked · 1983–2002 · 13 plantings

No stockings recorded since 2002 — shown as history.

Source: Michigan DNR Fish Stocking Database.

Non-native species records

3 records

Plants & algae

Eurasian Watermilfoil
Hybrid Watermilfoil
Purple Loosestrife

What does non-native mean?

USGS records identify non-native species that have been documented for this lake or its shoreline. Non-native does not necessarily mean invasive, and historical records do not confirm current presence.

Source: Midwest Glacial Lakes Partnership Conservation Planner; underlying nonindigenous species records from the USGS Nonindigenous Aquatic Species database.

Bait & tackle nearby

licensed retail bait dealers · straight-line distance

Norway Quick Stop≈4.6 mi · (906) 563-88011102 E 7Th Ave, Norway · Google · Apple

Mirjan Real Estate LLC≈4.6 mi · (906) 563-88011102 E 7th Ave, Norway · Google · Apple

City Sales LLC≈12.7 mi · (906) 774-3555105 Lake Antoine Dr, Iron Mountain · Google · Apple

Dealers licensed by the Michigan DNR to sell live bait; listing is not an endorsement. Distances are straight-line, not driving — and call ahead: hours and stock change. Source: Michigan DNR retail bait dealer data.

Quick answers

Mary Lake — common questions

How deep is Mary Lake?

The deepest contour on the Michigan DNR bathymetric survey of Mary Lake is 80 ft. That is the deepest depth the historical survey map records, which may differ from the deepest point of the lake itself.

How big is Mary Lake?

Mary Lake covers about 87 acres in Dickinson County, Michigan.

What is the average depth of Mary Lake?

The estimated mean depth of Mary Lake is 22.6 ft, calculated from the survey contours.

What fish are in Mary Lake?

Species with survey, catch or recent-stocking evidence include largemouth bass, crappie. The page shows the evidence behind each.

Is there public access to Mary Lake?

Yes. The Michigan DNR boat-launch data identifies 1 public access site on Mary Lake, including Mary Lake.