Grass Lake

Otsego County, Michigan · MI DNR bathymetric survey

6ft Max
depth

28 acres 2 contours 41% weedy

Paddling Index81Very GoodMedium confidencesheltered geometry · wooded shoreline

Get directions

Depth scale

056

The lake

Survey readout

Grass Lake is mapped to a depth of 6 ft on the Michigan DNR survey and covers about 28 acres in Otsego County, Michigan.

Measured from the Michigan DNR inland-lake contour survey.

Deepest sounding: 6 ft
Mean depth: 1.5 ft · estimated
Surface area: 28 acres
Estimated volume: 43 acre-ft · 14M gal
Shoreline: 1.37 mi · irregular
Aquatic vegetation: 41% of surface · NDVI estimate
Public access: No public DNR launch identified

Additional depth details2 contours

Contour depths: 0–6 ft
Recorded point soundings: 6 ft

100% of the surface sits over water shallower than 10 ft. Depth, area and volume are estimated from the interpolated survey surface — historical reference, not measurement.

Compare with another lake

Location

Otsego County, Michigan · 15 nearest of 46 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: 45.19346, -84.45725
MI DNR lake ID: L12065
Vertical exaggeration: 3.0×
Basemap: USDA NAIP · public domain
Model size: 1.6 MB

Paddling

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

81 / 100Very GoodData confidence: Medium

Grass Lake has a heavily wooded and largely undeveloped setting, well 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	Excellent	32.8 of 35	92% natural land cover within 150 m of shore (61% forest, 31% wetland; 8% developed)
Geometric wind exposure	Excellent	29.4 of 29	mean fetch 385 m · 92% of sampled water within 500 m of shelter · short fetch in most directions
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	10.1 of 18	some nearby classified roads · 8 MDOT-classified segments within 1.2 km, peak 360 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: High — approximately 41% 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 — 61% forest and 31% 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 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 angler catches

1 species with recent evidence in this lake — sized relative to each other. Illustrations are AI-generated representative adults in everyday colours, not photographs (provenance).

Pumpkinseed

Fishing rules for this lake Beta

Size and daily limits for the 1 species found here — 1 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.

PumpkinseedOpen to harvestMinimum size: no size limit · Daily limit: 25 (FO-215 · statewide inland) The 25 is in any combination of the sunfishes — Bluegill, Pumpkinseed, Black and White Crappie, Rock Bass, Green, Longear and Redear Sunfish, Warmouth and hybrids — not 25 of each (FO-215.23A).

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.

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 registered Master Angler catches. Silhouettes are stylized and scaled to typical adult sizes relative to one another. Presence is not a promise — fishing isn’t a sure thing.

Notable catches

Master Angler program · 2022

One Master Angler catch is on record for this lake: 9″ pumpkinseed in 2022 on live bait.

Master Angler entries are fish that met the program’s minimum size and were registered by the angler — they show what this lake has produced, not what a day here will produce. A catch on record is history, not a species listing: “Fish you might catch” lists only species with current evidence. Source: Michigan DNR Master Angler data.

Non-native species records

1 record

Plants & algae

Eurasian Watermilfoil

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.

Bait & tackle nearby

licensed retail bait dealers · straight-line distance

Dreffs Bait Shop≈14.6 mi5904 E M-32, Gaylord · 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

Grass Lake — common questions

How deep is Grass Lake?

The deepest contour on the Michigan DNR bathymetric survey of Grass Lake is 6 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 Grass Lake?

Grass Lake covers about 28 acres in Otsego County, Michigan.

What is the average depth of Grass Lake?

The estimated mean depth of Grass Lake is 1.5 ft, calculated from the survey contours.

What fish are in Grass Lake?

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

Is there public access to Grass Lake?

No public launch for Grass Lake appears in the Michigan DNR access data. That is not the same as the lake being private -- municipal and private ramps are not in that source.

More lakes in Otsego County