Mill & Overlay

About

A “mill & overlay” is a street maintenance technique that requires the removal of the top layer (2") 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.

2018 Mill and Overlay Projects

Arlington Ave – Rice to Jackson 
Forest Street – Maryland to 7th
Franklin Ave – 280 to Pelham, including Cromwell from Franklin to University
Prior Ave – University to Minnehaha 
Stryker Avenue – Baker to Annapolis
Third Street – Ruth to McKnight
Victoria Street – Summit to St. Clair
Western Ave – Larch to Front
Wilson Ave -- Ruth to McKnight

Street Maintenance Service Program 

Learn more about the City of Saint Paul’s Street Maintenance Service Program and property owner fees for lighting, street sweeping, seal coating and/or mill and overlay projects.