Mill & Overlay

2016 Mill and Overlay Projects

Location Limits Schedule
Vandalia Street I-94 to University Avenue Completed
Hamline Avenue University Ave. to Minnehaha Ave. 9/12-9/14
Mississippi River Blvd. Emerald St. to Dayton Ave. 9/16-9/20
Cayuga Street Jackson St. to W. of L’Orient St. TBD
E. 7th Street Minnehaha Ave. to Johnson Pkwy. TBD
Summit Avenue Dale St. through Victoria St. TBD
Kellogg Boulevard &
John Ireland Blvd.
Marion St. to John Ireland Blvd.
& N/S of Kellogg Blvd.
Childs Road RR tracks to 435’ SW of Pigs Eye Lake Rd. TBD
Note: All work is scheduled to be completed by mid-October

A “mill & overlay” is a street maintenance technique that requires the removal of the top layer (2 inches) of a street by the grinding action of a large milling machine. After the top layer is removed, a new layer of bituminous pavement is put in its place.

The Process

The “milling” portion of the project typically takes one to two days. After the milling is completed, the “overlay” is placed in one to two days depending on the width of the roadway and traffic conditions. Before the new pavement is placed, the surface of the newly milled pavement is covered with a liquid asphalt tack coat to bond the old and new pavements. Afterwards, a new asphalt overlay is placed at a depth of 1 ½” using a machine called a paver. Hot asphalt (350 degrees F) is brought in by trucks from the City’s Asphalt Plant. Each truck carries approximately 10 tons per load and overlay crews can quickly lay 400 to 600 tons of asphalt per day. The City typically mills and overlays three to five miles of city and county arterial streets (primary roads) in Saint Paul each year, depending on funding availability. The projects are selected based on pavement condition and traffic volume. Parking is restricted in the immediate area of the work; restriction signs are posted 24 hours prior to work starting.