Initially only the portion of the route within Aylmer was paved.

In 1965, the remaining portion of MS 311 was paved.

The first portion of the route was paved in 1973, but the entire route wasn't complete until 1976.

The portion of Sheridan Street facing the school was paved in 1927.

The eastern portion of the road was paved by 1967.

This original portion of the route was paved in 1956.

A few portions of the road near the top of the pass have been paved.

The remaining middle portion of the route was paved by 1946.

The portion of the highway within Boonsboro was paved in 1915.

In 1979, the designated portion of Highway 327 was paved.