Long Lake

Steuben County, Indiana · IN DNR bathymetric survey

35ft Max
depth

84 acres 7 contours

Paddling Index44ModestMedium confidencesheltered geometry

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Depth scale

05101520253035

The lake

Survey readout

Long Lake is mapped to a depth of 35 ft on the Indiana DNR survey and covers about 84 acres in Steuben County, Indiana. Depths come from the Indiana DNR survey of 2017.

Measured from the Indiana DNR lake bathymetry survey.

Deepest mapped contour: 35 ft
Survey year: 2017
Surface area: 84 acres
Shoreline: 1.88 mi · lobed
Aquatic vegetation: 2% of surface · NDVI estimate
Public access: No public DNR launch identified

Additional depth details7 contours

Contour depths: 0–35 ft
Recorded point soundings: 35 ft

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Location

Steuben County, Indiana · all 6 lakes · tap a dot for that lake

Chart data

Provenance

Sources: IN DNR Lake Bathymetry, USGS 3DEP, USDA NAIP (public domain), OpenStreetMap (ODbL).

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Map details & sources4 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. Color shows surveyed depth; dark lines are the survey's own isobaths.

Coordinates: 41.74721, -84.80689
IN DNR lake ID: 150994147
Vertical exaggeration: 2.49×
Basemap: USDA NAIP · public domain
Model size: 2.1 MB

Paddling

Paddling Index methodology v1.0 · calculated 2026-09-21

44 / 100ModestData confidence: Medium

Long Lake has a substantially 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	Modest	2.3 of 35	20% natural land cover within 150 m of shore (2% forest, 19% wetland; 35% developed)
Geometric wind exposure	Very Good	24.4 of 29	mean fetch 619 m · 11% of sampled water within 500 m of shelter · generally short fetch
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	8.3 of 18	some nearby classified roads · 4 INDOT-classified segments within 1.2 km, peak 1,800 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 2% 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 — 2% forest and 19% wetland cover within 150 m of shore

Compare Indiana 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: USGS NHD waterbody outline, USGS/MRLC NLCD Land Cover (2021), IN DNR Fishing Access Sites (motor restrictions) (2026-08) and INDOT Annual Average Daily Traffic (2021). Conditions change quickly — check current weather and local conditions before going out.

Fishing rules

No recent catch, survey, or stocking data for this lake — but a fisheries order still governs it.

Fishing rules for this lake Beta

Rules that apply to this water, whatever you are fishing for.

These are hook-and-line size and daily limit rules. The fishing code sets no closed season for these species on inland lakes, but posted property rules can close a water — see the notes. Gear, spearing and bow fishing, netting and bait collection are set by other sections of 312 IAC 9 and are not shown here.

Beta. This panel is newly published. Every value is transcribed from the Indiana Administrative Code (312 IAC 9-7) and checked against the Indiana DNR's 2026-27 Fishing Regulations Guide, but the coverage and wording are still under review. If anything here disagrees with 312 IAC 9-7 or the Indiana DNR's guide, the DNR is right — the Administrative Code is the legal text; the guide summarizes it.

Indiana–Michigan boundary lake: the Michigan side is Hillsdale County, Michigan. Residents of Indiana or Michigan may fish the whole lake, but must abide by the regulations in the waters they are fishing. Nonresident license holders (for either state) may only fish in the waters under which the jurisdiction applies for that nonresident license. (2026-27 Indiana Fishing Regulations Guide, p. 10 (Border Waters))

No closed season in the fishing code: 312 IAC 9-7 sets no season for these species on inland lakes (trout and salmon “at any time of year”, 9-7-13(d)(1)). Posted property rules can still close a water or bar entry (312 IAC 8-2-1) and 312 IAC 9-6-6 closes a few named areas, so check the property before you go. The possession limit is twice the daily bag limit (312 IAC 9-1-12.1); fish already processed and stored at your primary residence do not count toward it (312 IAC 9-2-8(d)).

From 312 IAC 9-7 (Sport fishing), Indiana Administrative Code (readopted 2025-03-25), and the 2026-2027 Indiana Fishing Regulations Guide · verified 2026-09-15. Regulations can change — the Indiana Administrative Code (312 IAC 9-7) is the controlling source; verify current regulations before fishing. Official regulations

Non-native species records

4 records

Plants & algae

Eurasian Watermilfoil
Holly-leaf Waternymph

Fish

Flathead Catfish
Redear Sunfish

How to identify invasive species in Indiana lakes →

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.

Quick answers

Long Lake — common questions

How deep is Long Lake?

The deepest contour on the Indiana 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 84 acres in Steuben County, Indiana.

Is there public access to Long Lake?

No public launch for Long Lake is shown in the Indiana DNR's public access data. That is not the same as the lake being private -- municipal and private ramps are not in that source.

More lakes in Steuben County