Hartwig Lake

Oakland County, Michigan · MI DNR bathymetric survey

23ft Max
depth

4.9 acres 5 contours 36% weedy

Paddling Index78GoodMedium confidencesheltered geometry · wooded shoreline

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Depth scale

0510152023

The lake

Survey readout

Hartwig Lake is mapped to a depth of 23 ft on the Michigan DNR survey and covers about 4.9 acres in Oakland County, Michigan.

Measured from the Michigan DNR inland-lake contour survey.

Deepest sounding: 23 ft
Mean depth: 7.7 ft · estimated
Surface area: 4.9 acres
Estimated volume: 37 acre-ft · 12M gal
Shoreline: 0.37 mi · round
Aquatic vegetation: 36% of surface · NDVI estimate
Public access: No public DNR launch identified
In: Holly Recreation Area · 8,080 ac

Additional depth details5 contours

Contour depths: 0–23 ft
Recorded point soundings: 23 ft

63.6% of the surface sits over water shallower than 10 ft; 3.5% is deeper than 20 ft. Depth, area and volume are estimated from the interpolated survey surface — historical reference, not measurement.

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Location

Oakland County, Michigan · 15 nearest of 116 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: 42.85626, -83.52962
MI DNR lake ID: L11183
Vertical exaggeration: 2.9×
Basemap: USDA NAIP · public domain
Model size: 0.3 MB

Paddling

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

78 / 100GoodData confidence: Medium

Hartwig Lake has a heavily wooded and largely undeveloped 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	Excellent	28.6 of 35	74% natural land cover within 150 m of shore (4% forest, 70% wetland; 0% developed)
Geometric wind exposure	Excellent	29.4 of 29	mean fetch 174 m · 100% 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	10.8 of 18	some nearby classified roads · 10 MDOT-classified segments within 1.2 km, peak 1,406 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: High — narrow throughout — passing wakes would reach most of the water
Aquatic vegetation: High — approximately 35% 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 — 4% forest and 70% 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.

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

T-Rex Adventures≈3.2 mi1447 N Ortonville Rd, Ortonville · Google · Apple

Brown's Sporting Food Inc≈5 mi7281 S State St, Goodrich · Google · Apple

Smithy's Exit 80≈10.5 mi2461 North Rd, Fenton · 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

Hartwig Lake — common questions

How deep is Hartwig Lake?

The deepest contour on the Michigan DNR bathymetric survey of Hartwig Lake is 23 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 Hartwig Lake?

Hartwig Lake covers about 4.9 acres in Oakland County, Michigan.

What is the average depth of Hartwig Lake?

The estimated mean depth of Hartwig Lake is 7.7 ft, calculated from the survey contours.

Is there public access to Hartwig Lake?

No public launch for Hartwig Lake appears in the Michigan DNR access data. That is not the same as the lake being private -- municipal and private ramps are not in that source.

More lakes in Oakland County