The redundant state designation was removed by the 1939 general redescription of the state highway system.
It received state historic designation in 1974, and city of Detroit designation in 1981.
It does not yet have the official state designation, which gives local officials some technical help and sometimes grants for planning around their train stations.
South Pine Grove Road continues ahead of the intersection, without the state designation.
The county route designation continues along the state designation.
The Townshends are seeking a state historic designation for the rock.
Its governance belongs, by state legislative designation, to the University of Minnesota.
The state designation was removed in 1939.
The measure, which would give state designation to Turtle Back, was passed by the Assembly last summer, but received little publicity.
But no formal application has been made for the state designation, a precursor to the federal designation.