Long Lake

Hillsdale County, Michigan · MI DNR bathymetric survey

35ft Max
depth

156 acres 9 contours Public access

Paddling Index54Modestsheltered geometry

Get directions

Depth scale

0125101517203035

The lake

Survey readout

Long Lake is mapped to a depth of 35 ft on the Michigan DNR survey and covers about 156 acres in Hillsdale County, Michigan.

Measured from the Michigan DNR inland-lake contour survey.

Deepest sounding: 35 ft
Mean depth: 10.6 ft · estimated
Surface area: 156 acres
Estimated volume: 1,656 acre-ft · 540M gal
Shoreline: 2.98 mi · irregular
Aquatic vegetation: 10% of surface · NDVI estimate
Public access: Boat Launch

Additional depth details9 contours

Contour depths: 0–35 ft
Recorded point soundings: 35 ft, 30 ft, 17 ft

49.7% of the surface sits over water shallower than 10 ft; 17.7% is deeper than 20 ft; the survey shows 2 distinct basins. Depth, area and volume are estimated from the interpolated survey surface — historical reference, not measurement.

Compare with another lake

Location

Hillsdale County, Michigan · 15 nearest of 22 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

Spot an error? Send a correction

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: 41.74742, -84.80688
MI DNR lake ID: L21046
Vertical exaggeration: 2.49×
Basemap: USDA NAIP · public domain
Model size: 2.2 MB

Paddling

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

54 / 100ModestData confidence: High

Long Lake has a mixed natural and developed setting, generally 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	Mixed	7.5 of 30	35% natural land cover within 150 m of shore (5% forest, 30% wetland; 32% developed)
Geometric wind exposure	Very Good	17.5 of 25	mean fetch 832 m · 1% 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	Good	12.8 of 15	1 site with DNR boating-facility records · 1 ramp lane · 6 trailer spaces
Road isolation	Good	8.5 of 15	some nearby classified roads · 8 MDOT-classified segments within 1.2 km, peak 1,041 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 10% 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 — 5% forest and 30% 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 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).

Walleyestocked

Yellow Perchstocked

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.

WalleyeOpen to harvestMinimum size: 15" · Daily limit: 5 (FO-215 · statewide inland)

Yellow PerchOpen to harvestMinimum size: no size limit · Daily limit: 25 (FO-215 · statewide inland)

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.

WalleyeOpen to harvestMinimum size: 15" · Daily limit: 5 (FO-215 · statewide inland)

Yellow PerchOpen to harvestMinimum size: no size limit · Daily limit: 25 (FO-215 · statewide inland)

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 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.

DNR stocking

state stocking record · 1985–2026

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

Yellow Perch1,250 stocked · 2023–2026 · 2 plantings

Walleye5,500 stocked · 1985–2019 · 7 plantings

Source: Michigan DNR Fish Stocking Database.

Public fishing access

MI DNR family-friendly fishing

Boat

County-managed · Yes, Rec Passport · Rustic restrooms · Dirt parking

Amenities: Boat launch

Source: Michigan DNR Family Friendly Fishing.

Bait & tackle nearby

licensed retail bait dealers · straight-line distance

Long Lake Grocery Co. LLC≈9.4 mi9651 Bankers Rd, Reading · Google · Apple

JJZ Lake Party Store LLC≈11.5 mi597 S Angola Rd, Coldwater · Google · Apple

Archery Spot Guns & More LLC≈11.8 mi · (517) 254-44553400 E Territorial Rd, Camden · 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

Long Lake — common questions

How deep is Long Lake?

The deepest contour on the Michigan DNR bathymetric survey of Long Lake is 35 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 Long Lake?

Long Lake covers about 156 acres in Hillsdale County, Michigan.

What is the average depth of Long Lake?

The estimated mean depth of Long Lake is 10.6 ft, calculated from the survey contours.

What fish are in Long Lake?

Species with survey, catch or recent-stocking evidence include walleye, yellow perch. The page shows the evidence behind each.

Is there public access to Long Lake?

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