Thayer Lake

Keweenaw County, Michigan · MI DNR bathymetric survey

5ft Max
depth

119 acres 1 contour Public access 36% weedy

Paddling Index84Very Goodaway from major roads · wooded shoreline · sheltered geometry

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Depth scale

The lake

Survey readout

Thayer Lake is mapped to a depth of 5 ft on the Michigan DNR survey and covers about 119 acres in Keweenaw County, Michigan.

Measured from the Michigan DNR inland-lake contour survey.

Deepest mapped contour: 5 ft
Mean depth: 2.4 ft · estimated
Surface area: 119 acres
Estimated volume: 285 acre-ft · 93M gal
Shoreline: 1.94 mi · lobed
Aquatic vegetation: 36% of surface · NDVI estimate
Public access: Boat Launch

Additional depth details1 contour

Contour depths: 0–5 ft
Recorded point soundings: 5 ft

100% of the surface sits over water shallower than 10 ft. Depth, area and volume are estimated from the interpolated survey surface — historical reference, not measurement.

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Location

Keweenaw County, Michigan · all 9 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.

⚠ Not for navigation

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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: 47.28795, -88.26423
MI DNR lake ID: L32675
Vertical exaggeration: 12.0× below the waterline; land at true scale
Basemap: USDA NAIP · public domain
Model size: 2.2 MB

Paddling

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

84 / 100Very GoodData confidence: High

Thayer Lake has a heavily wooded and largely undeveloped setting, generally sheltered geometry, little nearby major-road exposure. 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	Excellent	27.9 of 30	88% natural land cover within 150 m of shore (9% forest, 79% wetland; 9% developed)
Geometric wind exposure	Very Good	18.5 of 25	mean fetch 753 m · 0% of sampled water within 500 m of shelter · generally short fetch
Watercraft controls	None identified	7.5 of 15	No special watercraft restriction identified in the current DNR source. Motors permitted, subject to general law.
Public access	Excellent	15.0 of 15	1 site with DNR boating-facility records · carry-in launch · 2 trailer spaces
Road isolation	Excellent	15.0 of 15	relatively isolated from major roads · 1 MDOT-classified segment within 1.2 km, peak 182 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: High — approximately 36% 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: High — 9% forest and 79% 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 Boating Access Sites (2026-08), 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

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

Smallmouth Bass

Fishing rules for this lake Beta

Size and daily limits for the 1 species found here — 1 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.

Smallmouth 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.

Smallmouth 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).

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. 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 · 2023

One Master Angler catch is on record for this lake: 21″ smallmouth bass in 2023 on artificial lure.

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.

Non-native species records

No non-native species recorded in the available dataset. This does not confirm that no non-native species are present.

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

Campioni's True Value≈9.9 mi25664 Copper King Way, Calumet · 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

Thayer Lake — common questions

How deep is Thayer Lake?

The deepest contour on the Michigan DNR bathymetric survey of Thayer Lake is 5 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 Thayer Lake?

Thayer Lake covers about 119 acres in Keweenaw County, Michigan.

What is the average depth of Thayer Lake?

The estimated mean depth of Thayer Lake is 2.4 ft, calculated from the survey contours.

What fish are in Thayer Lake?

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

Is there public access to Thayer Lake?

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