Grindstone Lake
depth
Get directions
Depth scale
Survey readout
Grindstone Lake is mapped to a depth of 150 ft on the Minnesota DNR survey and covers about 528 acres in Pine County, Minnesota. Depths come from the Minnesota DNR survey of 1970.
Measured from the Minnesota DNR lake bathymetric contour survey.
- Deepest mapped contour
- 150 ft
- Survey year
- 1970
- Surface area
- 528 acres
- Shoreline
- 4.83 mi · irregular
- Aquatic vegetation
- 0% of surface · NDVI estimate
- Public access
- Trailer Launch · Grindstone Lake Public Water Access Site · Minnesota DNR site
Additional depth details16 contours
- Contour depths
- 0–150 ft
- Recorded point soundings
- 150 ft, 120 ft, 90 ft
Provenance
Sources: MN DNR Lake Bathymetric Contours, USGS 3DEP, USDA NAIP (public domain), OpenStreetMap (ODbL).
⚠ Not for navigationSpot an error? Send a correction
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
- 46.12237, -93.00684
- MN DNR lake ID
- 58012300
- Vertical exaggeration
- 1.4×
- Basemap
- USDA NAIP · public domain
- Model size
- 2.4 MB
Paddling
Paddling Index methodology v1.0 · calculated 2026-09-25Grindstone Lake has a partly natural setting, moderate open-water exposure, limited nearby major-road exposure.
Why this score?5 components
Included in the index
| Component | Rating | Points of weight | Measurement |
|---|---|---|---|
| Natural setting | Good | 17.9 of 35 | 56% natural land cover within 150 m of shore (37% forest, 19% wetland; 21% developed) |
| Geometric wind exposure | Good | 9.2 of 29 | mean fetch 2,107 m · 0% of sampled water within 500 m of shelter · moderate open-water fetch |
| Motor & speed rules | Not modeled | — | Minnesota’s lake-by-lake motor, speed and no-wake rules are mostly county and city ordinances, not map data, so they are not part of the Minnesota index. Check local signage and ordinances before going out. |
| Public access | Good | 15.0 of 18 | 1 DNR public access site · boat ramp |
| Road isolation | Very Good | 12.5 of 18 | limited nearby major-road exposure · 3 MnDOT-classified segments within 1.2 km, peak 417 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 0% 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
- Moderate — 37% forest and 19% wetland cover within 150 m of shore
Compare Minnesota lakes by Paddling Index →
Fish you might catch
from DNR surveys & active stocking18 species with recent evidence in this lake — sized relative to each other. Illustrations are AI-generated representative adults in everyday colors, not photographs (provenance).
Greater Redhorse
Brown Trout
Redhorse
SplakestockedGolden Redhorse
White Sucker
Shorthead Redhorse
Brook Troutstocked
Rainbow SmeltAbout these fish → the Fish of Minnesota guide
Fishery
surveyed 2025Gamefish Smallmouth Bass 101 · Largemouth Bass 69 · Northern Pike 45 · Lake Trout 12
Panfish Bluegill 111 · Rock Bass 28 · Black Crappie 18
All survey species16 species
Gamefish
Panfish
Forage & nongame
DNR stocking
state stocking record · 2016–2025Fish the Minnesota DNR has planted in this lake — what was added, distinct from what a survey netted above.
Infested waters listing
Not on the Minnesota DNR’s infested waters list as of September 9, 2026. This does not mean the lake is free of invasive species: the list covers certain species only, and a species can be present before anyone finds it.
What does the infested waters list mean?
The Minnesota DNR lists a lake, river, pond or wetland as infested when it contains an aquatic invasive species that could spread to other waters, or when it is connected to a water where one is present. Activities such as bait harvest and water use are managed differently on infested waters. Check the current list before moving water, bait or equipment.
Source: Minnesota Department of Natural Resources. List of Infested Waters, September 9, 2026. https://www.dnr.state.mn.us/invasives/ais/infested.html
Grindstone Lake — common questions
How deep is Grindstone Lake?
The deepest contour on the Minnesota DNR bathymetric survey of Grindstone Lake is 150 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 Grindstone Lake?
Grindstone Lake covers about 528 acres in Pine County, Minnesota.
What fish are in Grindstone Lake?
Species with survey, catch or recent-stocking evidence include brook trout, brown trout, lake trout, largemouth bass, northern pike, rainbow trout. The page lists all 18 species and the evidence behind each.
Is there public access to Grindstone Lake?
Yes. The Minnesota DNR lists a public access site on Grindstone Lake: a boat ramp with a boat dock and restrooms. It is administered by the DNR Division of Parks and Trails. DNR directions: "6 mi W of Sandstone on the N shore."
