The road was removed from the state highway system in 2011.
Later this road was added to the state highway system in the early 20th century.
It was added to the state highway system in 1937.
SH-146 was added to the state highway system around 1961.
SH-49 was added to the state highway system in 1939.
It was part of the state highway system from 1939 to 2004.
SH-6 was added to the state highway system in 1954.
SH-56 was first added to the state highway system in 1929.
It has been a part of the state highway system at least since 1927.
From 1929 until 1960, the road was part of the state highway system as M-135.
The road was removed from the state highway system in 2011.
Later this road was added to the state highway system in the early 20th century.
It was added to the state highway system in 1937.
SH-146 was added to the state highway system around 1961.
SH-49 was added to the state highway system in 1939.
It was part of the state highway system from 1939 to 2004.
SH-6 was added to the state highway system in 1954.
SH-56 was first added to the state highway system in 1929.
It has been a part of the state highway system at least since 1927.
From 1929 until 1960, the road was part of the state highway system as M-135.