Pratt Lake
Gladwin County, Michigan188 acresView mapDirections
No nutrient or algae sampling on record from EGLE for this lake.
- Impaired · Mercury
- 25 ft max depth
- Public access
Pratt Lake in Gladwin County, Michigan has water-quality measurements published by EGLE, shown here as reported. Maximum depth: 25 ft. Surface area: 188.2 acres.
Water clarity at Pratt Lake
Clear water. Across summers from 2018 to 2023, Pratt Lake averaged 3.69 m (12 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 4.64 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.
Pratt Lake is a 188-acre lake in Gladwin County, Michigan with a maximum depth of 25 feet (10-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 Pratt Lake is good for
From access and monitoring records, not editorial picks.
- Boat launch1 documented ramp
Swimming conditions
No readingNot rated
Nutrient and algae readings are not a swimming clearance. Pratt Lake is listed impaired under Clean Water Act §303(d) (IR 4A) for mercury. Check local advisories before you swim.
Whether Pratt 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.
Water quality measurements for Pratt Lake
These are the measurements EGLE publishes for Pratt 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 Pratt Lake
Answers come straight from the public measurements and survey records on this page.
Lake Details
Max depth
25 ft
Average depth
10 ft
Surface area
188 acres
Shoreline
1.2 mi
Public access
Yes
Listed by EGLE
Recreation & Access
- Pratt 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 Pratt Lake
Compare lakeside cabins, hotels, and vacation rentals near Pratt Lake in Gladwin 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 Pratt Lake
Prices for Oct 16–18, 4 adults. Change dates on the map below.
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Planning a whole trip? See where to stay at Michigan’s top lakes →
Follow Pratt Lake’s readings
Email me when new measurements post for this lake. Updates stay free.
Or email
Fishing Pratt Lake
EPA Impairment Status
Pratt Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 4A).
Causes of impairment
Designated uses not supporting: Fish consumption.
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit MI040802010203-02 · Official waterbody report
Nearby Lakes in Gladwin County
Frequently asked questions about Pratt Lake
Where is Pratt Lake?
- Pratt Lake is a lake in Gladwin County, Michigan. Its water-quality measurements are published by EGLE and shown on this page as reported.
What is the water quality of Pratt Lake?
- Pratt Lake in Gladwin County, Michigan has water-quality measurements published by EGLE, shown here as reported. Maximum depth: 25 ft. Surface area: 188.2 acres.
Is Pratt Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Pratt Lake is listed impaired under Clean Water Act §303(d) (IR 4A) for mercury. Check local advisories before you swim.
How deep is Pratt Lake?
- Pratt Lake has a maximum depth of 25 feet and an average depth of 10 feet. The lake covers 188.2 acres.
Are there boat ramps on Pratt Lake?
- Pratt Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Pratt Lake. Public access is listed as yes.
Can I fish at Pratt Lake?
- Pratt 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.
Explore Pratt Lake across LakeQuality
Fish species and the cleanest lakes across Michigan
Species activity outlook by water temperature and season
Where to stay at Michigan's top lakes, each with its readings
Michigan's cleanest lakes, ranked on agency measurements
More lakes in Michigan
Other Lakes in Michigan
Where this data comes from
Measurements for Pratt Lake come from the EPA Water Quality Portal. Per-sample source details are not recorded for this lake.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database
Named boat-access points from the USGS National Boat Ramps inventory