An 1875 lumber town on the Cedar River, with a sidewalk code that spells out the pour.
Gladwin got its start in 1875 during the Michigan lumber boom, on the Cedar River, and today it is the Gladwin County seat with about 3,100 residents. Its houses run older than those in the countryside around it. By Census count (ACS 2024), 42 percent of the city's 1,635 homes predate 1960, nearly three in four predate 1980, and the median one was built in 1965. Only about half are owner-occupied. Many porch steps, front walks and garage floors here have been through sixty or more winters, and NOAA's Gladwin station averages about 165 nights a year at or below freezing.
Step outside city limits and the picture changes. In ZIP 48624 the median home dates to 1980, and about a third of its 11,057 housing units are held for seasonal or recreational use, alongside some 1,100 mobile homes. That mix calls for cabin foundations, piers, storage shed pads and pole barn floors more than city sidewalks. Gladwin County's construction codes fee schedule states that any building over 400 square feet requires a foundation, and the county department issues building permits for the city and the townships alike.
The ground shifts quickly around Gladwin. Around the city center the county soil survey shows mostly sand: Epoufette sandy loam, Au Gres sand and Gladwin loamy sand, where groundwater can rise to within half a foot to a foot and a half of the surface between fall and early summer, next to drier Mancelona sand. Out on the rolling moraines, Nester loam formed in clay-rich glacial till, with slow permeability and perched water 30 to 42 inches down from November to May. Wet sand calls for a gravel bed and a way for water to leave. Nester clay calls for deeper excavation, careful compaction and footings below frost.
Inside city limits, Gladwin's sidewalk ordinance reads like a spec sheet. Section 96.31 calls for walks four inches thick of 3,000 psi concrete on a compacted base, five feet wide, at least six inches thick where a driveway crosses, with contraction joints every five feet and a half inch joint at the curb. The city must get 48 hours notice and inspects the forms and subgrade before the pour. The owner of the lot alongside pays for the walk and keeps it clear of ice and snow. Building or changing a driveway approach in a city street needs a permit through the City Clerk.
What Gladwin concrete runs into
- Front walks and porch steps on 1940s and 1950s lots, worn by about 165 freezing nights a year.
- Slabs lifting on Au Gres and Gladwin sands where water sits 6 to 18 inches down.
- Footings in Nester clay till, which drains slowly and holds perched water through spring.
- Replacement sidewalk poured four inches thick across a driveway, where the city wants six.
- Cabins, garages and sheds over 400 square feet set without the foundation the county requires.
- Low lots by the Cedar River, which left its banks into city businesses in 2014 and City Park in 2020.
