the 45th Parallel

Alpena, Michigan

Alpena Marsh

South of Alpena and north of Ossineke, the M-23 highway skirts a large sandy marsh on the edge of Lake Huron's Thunder Bay. At about halfway along the marsh there is a plain highway sign on the east side of the road. The sign reads:

You are now crossing
the 45th Parallel

Halfway between the Equator
and North Pole

A sign has marked the 45th Parallel crossing here for many decades. Two antique postcards show earlier versions of the sign on Highway 23 in the 1930s or 40s and in the 1960s. Note the fluctuations in the lake level over the years:

45th Parallel Marker Alpena

45th Parallel Marker Alpena

45th Parallel Line

Halfway between
North Pole & Equator

View 45th Parallel Markers in Google Maps