Indian Rock Lake

Daviess County, Indiana · IN DNR bathymetric survey

17ft Max
depth

28 acres 3 contours Public access

Paddling Index55Mixedsheltered geometry

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Depth scale

05101517

The lake

Survey readout

Indian Rock Lake is mapped to a depth of 17 ft on the Indiana DNR survey and covers about 28 acres in Daviess County, Indiana. Depths come from the Indiana DNR survey of 2017.

Measured from the Indiana DNR lake bathymetry survey.

Deepest mapped contour: 17 ft
Survey year: 2017
Surface area: 28 acres
Shoreline: 1.74 mi · irregular
Aquatic vegetation: 15% of surface · NDVI estimate
Public access: Boat Ramp · Montgomery City Lake · Indiana DNR site

Additional depth details3 contours

Contour depths: 0–17 ft
Recorded point soundings: 17 ft

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Location

Daviess County, Indiana · the only mapped lake in this county

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: 38.67125, -87.03942
IN DNR lake ID: 90366180
Vertical exaggeration: 3.0× below the waterline; land at true scale
Basemap: USDA NAIP · public domain
Model size: 1.7 MB

Paddling

Paddling Index methodology v1.0 · calculated 2026-10-08

55 / 100MixedData confidence: High

Indian Rock Lake has a substantially developed setting, well sheltered geometry, nearby higher-volume 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	4.2 of 30	27% natural land cover within 150 m of shore (26% forest, 0% wetland; 26% developed)
Geometric wind exposure	Excellent	25.0 of 25	mean fetch 410 m · 77% of sampled water within 500 m of shelter · short fetch in most directions
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 DNR fishing access site · boat ramp · fishing pier
Road isolation	Mixed	5.1 of 15	nearby higher-volume roads · 8 INDOT-classified segments within 1.2 km, peak 8,448 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: Moderate — narrow in places — wakes would carry across parts of the lake
Aquatic vegetation: Moderate — approximately 15% 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 — 26% forest and 0% 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), IN DNR Fishing Access Sites (2026-08) and INDOT Annual Average Daily Traffic (2021). Conditions change quickly — check current weather and local conditions before going out.

Quick answers

Indian Rock Lake — common questions

How deep is Indian Rock Lake?

The deepest contour on the Indiana DNR bathymetric survey of Indian Rock Lake is 17 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 Indian Rock Lake?

Indian Rock Lake covers about 28 acres in Daviess County, Indiana.

Is there public access to Indian Rock Lake?

Yes. The Indiana DNR lists a public access site on Indian Rock Lake: a boat ramp with a fishing pier, a boat dock and restrooms. The DNR notes that an entry fee applies.