Tobico Marsh Lake
Bay County, Michigan643 acresView mapDirections
No nutrient or algae sampling on record from EGLE for this lake.
- Impaired · PCBs
- 20 ft max depth
Tobico Marsh Lake in Bay County, Michigan has water-quality measurements published by EGLE, shown here as reported. Maximum depth: 20 ft. Surface area: 643.4 acres.
Water clarity at Tobico Marsh Lake
Murky water. Across summers from 2019 to 2021, Tobico Marsh Lake averaged 0.96 m (3 ft) of visibility down into the water, so you cannot see far below the surface in midsummer.
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 24.45 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.
Tobico Marsh Lake is a 643-acre lake in Bay County, Michigan with a maximum depth of 20 feet (7-foot average).
Source: EPA Water Quality Portal sampling records, EGLE. Methodology: how these readings are compared.
What Tobico Marsh Lake is good for
From access and monitoring records, not editorial picks.
- Camping1 public campground nearby
Swimming conditions
No readingNot rated
Nutrient and algae readings are not a swimming clearance. Tobico Marsh Lake is listed impaired under Clean Water Act §303(d) (IR 4A) for pCBs. Check local advisories before you swim.
Whether Tobico Marsh 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 Tobico Marsh Lake
These are the measurements EGLE publishes for Tobico Marsh 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 Tobico Marsh Lake
Answers come straight from the public measurements and survey records on this page.
Lake Details
Max depth
20 ft
Average depth
7 ft
Surface area
643 acres
Shoreline
1.2 mi
Recreation & Access
Public campgrounds near Tobico Marsh Lake
- Bay City State Park Campground4.2 km
Nearest public campgrounds in the USGS National Map inventory, within about 3 miles. An empty list means USGS records no campground that close, which is not the same as camping being unavailable. Where the source gives an official reservation link, it is used; the cabin and hotel search does not cover campsites. More camping lakes
Stays via Stay22
Stays near Tobico Marsh Lake
Compare lakeside cabins, hotels, and vacation rentals near Tobico Marsh Lake in Bay 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 Tobico Marsh 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 Tobico Marsh Lake’s readings
Email me when new measurements post for this lake. Updates stay free.
Or email
Fishing Tobico Marsh Lake
EPA Impairment Status
Tobico Marsh 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 MI040801020106-05 · Official waterbody report
Nearby Lakes in Bay County
Frequently asked questions about Tobico Marsh Lake
Where is Tobico Marsh Lake?
- Tobico Marsh Lake is a lake in Bay County, Michigan. Its water-quality measurements are published by EGLE and shown on this page as reported.
What is the water quality of Tobico Marsh Lake?
- Tobico Marsh Lake in Bay County, Michigan has water-quality measurements published by EGLE, shown here as reported. Maximum depth: 20 ft. Surface area: 643.4 acres.
Is Tobico Marsh Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Tobico Marsh Lake is listed impaired under Clean Water Act §303(d) (IR 4A) for pCBs. Check local advisories before you swim.
How deep is Tobico Marsh Lake?
- Tobico Marsh Lake has a maximum depth of 20 feet and an average depth of 7 feet. The lake covers 643.4 acres.
Are there campgrounds on Tobico Marsh Lake?
- Tobico Marsh Lake has 1 public campground from USGS The National Map within 5 km, including Bay City State Park Campground. This is a location join, not a booking. Cabins and hotels are listed separately; campsite reservations use the official link when the source provides one.
Explore Tobico Marsh 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 Tobico Marsh 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
Public campgrounds from USGS The National Map Structures, within about 3 miles