Dewey Lake is a lake in Cass County, Michigan. Its water-quality measurements are published by EGLE and shown on this page as reported.

How deep is Dewey Lake?

Dewey Lake has a maximum depth of 58 feet and an average depth of 8 feet. The lake covers 226 acres.

Are there boat ramps on Dewey Lake?

Dewey Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Dewey Lake. Public access is listed as yes.

Can I fish at Dewey Lake?

Dewey Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Seasons, size and bag limits, and whether you need a license are set by Michigan's fish and wildlife agency, so check its current regulations before you go.

Dewey Lake

Cass County, Michigan226 acresView map Directions

No nutrient or algae sampling on record from EGLE for this lake.

Max depth

58 ft

Bathymetric survey

Area

226 acres

Surface area

Shoreline

1 mi

Measured length

58 ft max depth
Public access

See the measurements Directions Where to stay

Dewey Lake in Cass County, Michigan has water-quality measurements published by EGLE, shown here as reported. Maximum depth: 58 ft. Surface area: 226 acres.

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Water clarity at Dewey Lake

Clear water. Across summers from 2018 to 2023, Dewey Lake averaged 3.29 m (11 ft) of visibility down into the water, so you can typically see several feet down in midsummer. This lake sits close to the line between clarity classes, so treat the label as approximate and the depth reading as the real number.

Nobody has taken a water sample here that we can find. Michigan's environmental agency measures clarity on lakes like this one from satellite images instead, which is why this page reports how clear the water is and no phosphorus or algae readings.

Clear is not the same as clean. A lake can be easy to see through and still carry high nutrient levels, and a naturally tea-stained lake can be perfectly healthy. The nutrient and algae readings on other lakes come from phosphorus and chlorophyll-a measured in a laboratory, and clarity alone cannot stand in for them.

The same satellite images put summer algae here at roughly 4.12 micrograms per litre. Estimating algae from orbit is far less exact than measuring clarity, so that figure is worth knowing and is not part of any rating.

Dewey Lake is a 226-acre lake in Cass County, Michigan with a maximum depth of 58 feet (8-foot average). Limited fish-species data available. Public access is available with 1 public boat landing.

Source: EPA Water Quality Portal sampling records, EGLE. Methodology: how these readings are compared.

What Dewey Lake is good for

From access and monitoring records, not editorial picks.

Boat launch1 documented ramp
Deep water58 ft surveyed max depth

Swimming conditions

No reading

Not rated

Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.

Whether Dewey Lake is safe to swim in today is a call for the Michigan Department of Environment, Great Lakes, and Energy (EGLE) and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.

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Water quality measurements for Dewey Lake

These are the measurements EGLE publishes for Dewey Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.

No clarity data. TSI undefined.

Ask about Dewey Lake

Answers come straight from the public measurements and survey records on this page.

Lake Details

Max depth

58 ft

Average depth

8 ft

Surface area

226 acres

Shoreline

1 mi

Public access

Yes

Listed by EGLE

Recreation & Access

Boat Landings

Yes

Public Access

Dewey LakePublic

Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps

Stays via Stay22

Stays near Dewey Lake

Compare lakeside cabins, hotels, and vacation rentals near Dewey Lake in Cass County, Michigan — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water.

Top-rated places to stay near Dewey Lake

Prices for Oct 16–18, 4 adults. Change dates on the map below.

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Follow Dewey Lake’s readings

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Fishing Dewey Lake

→ Dewey Lake fishing regulations (limits, seasons, special rules)

Nearby Lakes in Cass County

Cable Lake0.9 miView →Magician Lake10 ft clear1.3 miView →Grabemeyer Lake1.6 miView →Priest Lake—View →Indian Lake—View →Geer Lake—View →

Frequently asked questions about Dewey Lake

Where is Dewey Lake?: Dewey Lake is a lake in Cass County, Michigan. Its water-quality measurements are published by EGLE and shown on this page as reported.
What is the water quality of Dewey Lake?: Dewey Lake in Cass County, Michigan has water-quality measurements published by EGLE, shown here as reported. Maximum depth: 58 ft. Surface area: 226 acres.
Is Dewey Lake safe to swim in?: Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
How deep is Dewey Lake?: Dewey Lake has a maximum depth of 58 feet and an average depth of 8 feet. The lake covers 226 acres.
Are there boat ramps on Dewey Lake?: Dewey Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Dewey Lake. Public access is listed as yes.
Can I fish at Dewey Lake?: Dewey Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Seasons, size and bag limits, and whether you need a license are set by Michigan's fish and wildlife agency, so check its current regulations before you go.