Olin Lake
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Survey readout
Olin Lake has a reported maximum depth of 81 ft, and covers about 104 acres in LaGrange County, Indiana. The Indiana DNR survey maps contours down to 70 ft; the depth between 70 ft and 81 ft is interpolated rather than measured. Depths come from the Indiana DNR survey of 2018.
Measured from the Indiana DNR lake bathymetry survey.
Depth below 70 ft is interpolated. The survey's own contours stop at 70 ft, while it reports a maximum of 81 ft. The basin between those two depths is inferred by the model, not measured — so the shape of the deep hole is an estimate, and the deep-spot marker shows the deepest depth actually surveyed.
- Deepest mapped contour
- 70 ft
- Survey year
- 2018
- Surface area
- 104 acres
- Shoreline
- 2.13 mi · lobed
- Aquatic vegetation
- 3% of surface · NDVI estimate
- Public access
- By water from another ramp · Indiana DNR: “Use Oliver Lake Ramp”
Additional depth details7 contours
- Contour depths
- 0–81 ft
- Recorded point soundings
- 70 ft
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
- 41.56247, -85.39251
- IN DNR lake ID
- 155641463
- Vertical exaggeration
- 1.4×
- Basemap
- USDA NAIP · public domain
- Model size
- 2.1 MB
Paddling
Paddling Index methodology v1.0 · calculated 2026-09-21Olin 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 | 28.9 of 30 | 88% natural land cover within 150 m of shore (6% forest, 82% wetland; 0% developed) |
| Geometric wind exposure | Very Good | 18.7 of 25 | mean fetch 745 m · 3% 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 DNR fishing access site · DNR directs boaters to a ramp on connected water · ADA-accessible |
| Road isolation | Excellent | 15.0 of 15 | relatively isolated from major roads · 0 INDOT-classified segments within 1.2 km |
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 3% 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 — 6% forest and 82% wetland cover within 150 m of shore
Compare Indiana lakes by Paddling Index →
Fish you might catch
from DNR surveys16 species with recent evidence in this lake — sized relative to each other. Illustrations are AI-generated representative adults in everyday colors, not photographs (provenance).
Common Carp
Brown Trout
Rainbow Trout
White Sucker
Brook Silverside
Spotfin Shiner
Mimic ShinerAbout these fish → the Fish of Indiana guide
Fishing rules for this lake Beta
Size and daily limits for the 16 species found here — 12 open to harvest, 1 with a special rule or closed season.
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.
Official rule text for this lake
“The brown trout are at least eighteen (18) inches long if taken from Oliver Lake, Olin Lake, or Martin Lake in LaGrange County.” — 312 IAC 9-7-13(d)(3), Indiana Administrative Code
“An individual may take minnows at any time during the year.” — 312 IAC 9-7-15(a), Indiana Administrative Code
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
Fishery
surveyed 2021Gamefish Largemouth Bass 39 · Rainbow Trout 24 · Smallmouth Bass 3 · Channel Catfish 2
Panfish Bluegill 121 · Rock Bass 8 · Warmouth 3
All survey species16 species
Gamefish
Panfish
Bullhead & catfish
Forage & nongame
Non-native species records
2 recordsPlants & algae
Other invertebrates
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.
Olin Lake — common questions
How deep is Olin Lake?
The Indiana DNR reports a maximum depth of 81 ft for Olin Lake. The survey's own contours reach 70 ft, so the depth below that is interpolated from the reported maximum rather than mapped.
How big is Olin Lake?
Olin Lake covers about 104 acres in LaGrange County, Indiana.
What fish are in Olin Lake?
Species with survey, catch or recent-stocking evidence include brown trout, channel catfish, largemouth bass, rainbow trout, smallmouth bass, bluegill. The page lists all 16 species and the evidence behind each.
Is there public access to Olin Lake?
The Indiana DNR lists Olin Lake as open to the public by water rather than from a ramp of its own: its access record reads "Olin Lake (Use Oliver Lake Ramp)". The launch is on connected water, not on Olin Lake itself.
Is the depth of Olin Lake measured or estimated?
The survey contours reach 70 ft while the survey reports a maximum of 81 ft, so the basin between those depths is inferred by the model rather than measured.
