Mary Lake (Langlade, Oconto County)
Waterbody ID (WBIC): 496300 — permanent page /lakes/496300/.
Mary Lake is in Langlade, Oconto County; records show 154 acres and 2 DNR access-site records.
- Size
- 154 acres
- Lake type
- DRAINAGE
- Max depth
- 20 ft
- 2 documented public access site records (DNR access inventory)
- 2 fish species/groups with abundance categories (DNR lake page)
- Summer Secchi clarity median 8 ft (field measurements)
- Official DNR depth map available (PDF)
Back to results Show on map Choose access / Directions Depth map (PDF) Check current DNR regulations
Plan your visit
- Lake directory: public landing — Yes
- Lake directory: public beach — No
- Lake directory: public park — Yes
- DNR public-access inventory: 2 documented access site records
- DNR public-access inventory: documented carry-in access
- 1 site qualify for per-site Directions through the reviewed lake association (load the site details below)
Each statement is bounded to its named source; absence of a record is never evidence of no access. The DNR access database may lag reality; posted signs at the landing are authoritative.
Verify at the DNR public boat access program page.
Nearby facilities
- FANNY LAKE TRAILHEAD — Trailhead; ≈2.9 km from the lake shoreline (straight line); ≈3.7 km from the associated access point (straight line); fee charged.
- BOOT LAKE — Campground; ≈3.6 km from the lake shoreline (straight line); ≈4.3 km from the associated access point (straight line); fee charged. Official USFS page
- BASS LAKE SWIM SITE — Swimming site; ≈5.3 km from the lake shoreline (straight line); ≈5.9 km from the associated access point (straight line); fee charged.
- ROSE LAKE BL — Boating site; ≈6.5 km from the lake shoreline (straight line); ≈7.4 km from the associated access point (straight line).
- CATHEDRAL PINES TRAILHEAD — Trailhead; ≈8.6 km from the lake shoreline (straight line); ≈9.1 km from the associated access point (straight line).
- 7 more inventoried sites within 15 km.
USFS Chequamegon-Nicolet constructed recreation sites only; straight-line distance is geographic context, not a travel route.
Documented public access sites — load details
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Fishing
The DNR lake page publishes 2 fish species/groups with abundance categories — categories are source labels, never a population count.
DNR fish labels: Largemouth Bass—Common; Panfish—Present; not population counts.
No fisheries survey population estimate is published for this lake in the covered report families.
Fishing limits — 2026-2027 season: 19 normalized rows across 19 species entries. Normalized from the DNR ruleset retrieved 2026-08-04. Source text remains authoritative.
Fish species and abundance detail — load details
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2026-2027 retained fishing rules: 19 published rows for 19 species; effective through 2027-03-07. Check current DNR rules.
Normalized fishing-regulation rows — load details
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Water and setting
- Field-measured summer Secchi clarity: median 8 ft from 15 samples, latest sample 2025-07-28
- Satellite clarity estimate: 7.21 ft (2017) — a remote-sensing estimate, kept separate from field measurements
- Lake directory clarity class: Moderate
Official DNR depth map (PDF) — Historical lake map; not for navigation. Link checked 2026-07-16.
Not published in the lake directory: official mean depth.
- AIS record: Banded mystery snail — Verified (vouchered), latest documented 2009-07-28
- AIS record: Phragmites (non-native ecotype) — Verified (vouchered), latest documented 2015-07-15
Occurrence records come from a non-exhaustive DNR inventory; a record documents presence at observation time and a missing record is never evidence of absence.
- Public-land proximity (GIS proxy, not access evidence): mapped public land within 1,000 ft; nearest: Nicolet National Forest (USDA FOREST SERVICE); ≈50% of shoreline buffer
- Shoreline development (landcover proxy, 2025 source): ≈4.8% developed land within 300 m, ≈0.9% impervious
- Road proximity (TIGER proxy, 2025 source): nearest local road or city street ≈0 m; ≈1.6 km of road per km² within 1 km
Measured and satellite clarity records — load details
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Aquatic invasive species records — load details
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Data & sources
Published data families
- Fish species and abundance (DNR lake pages)
- Fishing regulations (normalized snapshot)
- Directory access facts (landing, beach, park)
- Public access site inventory
- Satellite water clarity estimate
- Field-measured Secchi clarity
- Aquatic invasive species occurrences
Original records: Wisconsin DNR lake page.
Missing values are unpublished, never zero; each fact above is bounded to its named source and date. Full sourcing detail: Data & methods.