Ashlar Stone

Ashlar Stone


A Reduction in Excavation and Backfill for a Tennessee Road Widening Project sticky icon

Reinforced Earth MSE Wall

The bottom line is safety, and that was especially true for approximately 12 miles of SR 16/US 41A between Shelbyville and Tullahoma, about 80 miles southeast of Nashville. This corridor was studied in the mid-1990s by Tennessee Department of Transportation (TDOT) for possible operating deficiencies. TDOT determined that the projected 60% traffic growth by the mid-2010s would lead to more accidents and lower overall safety on what was, essentially, a 2-lane country highway.

Faster Travel Time Around Atlanta sticky icon

Reinforced Earth Product in Field

To provide access to and from both travel directions of the adjacent mainline roadways, managed lanes are often constructed in the highway median. In this sometimes narrow space, Mechanically Stabilized Earth (MSE) retaining walls can efficiently retain grade differences across the median between the flanking mainline roadways, supporting ramps, and bridge abutments that are typical of reversible lanes.

Broad Street Parkway sticky icon

Reinforced Earth Wall adjacent to flood-prone Nashua River

Like main roads in many cities and towns, Broad Street in Nashua, New Hampshire begins in the western suburbs and extends to the westerly edge of the downtown district. Along the way it intersects the F.E. Everett Turnpike (US Rte. 3), a heavily-traveled toll highway running from the Massachusetts border and Boston, to the south, to Concord, the state capital to the north.

Milton Madison Replacement Bridge sticky icon

Reinforced Earth Product in Field

A bridge born in 1929, as the Great Depression began, was reborn eight decades later as a result of the Great Recession.  Funded in part by a $20 million TIGER (Transportation Investment Generating Economic Recovery) grant from the American Recovery and Reinvestment Act of 2009, the Milton Madison replacement bridge carries 4 lanes of US 421 between Milton, KY and Madison, IN.  Originally constructed as a 2-lane, 20 ft. wide through truss bridge having only 16.8 ft.

Fairfax County Parkway/Fair Lakes Parkway Interchange sticky icon

Reinforced Earth Product in Field

In the early 1990s, developers had their eyes on several tracts of land in west-central Fairfax County, Virginia, planning to build shops, offices, restaurants, homes, schools and the other physical features of modern suburban life.  Simultaneously, the Virginia Department of Transportation (VDOT) had been planning a north-south parkway through the western part of the county.  Utilizing the "proffer system", in which developers are required to pay for (or directly construct to VDOT standards) certain necessary infrastructure components in exchange for approval of their d

Hartsfield-Jackson Atlanta Airport sticky icon

Reinforced Earth Product in Field

When the City of Atlanta leased 287 acres of land for an airfield in 1925, no one imagined that in 2013 nearly 95 million passengers would pass through what became the world's busiest airport, Hartsfield-Jackson International.  Similarly, the inbound roadway system designers of the late 1970s could not have envisioned the doubling of automobile traffic that would clog airport entrance roadways some 30+ years later.  So to improve traffic flow and provide for the airport's continued growth, the Inbound Roadways Project was begun in 2013.

Veterans Memorial Bridge / Design-Build sticky icon

MSE Precast Abutment

As the gateway to Maine's largest metropolitan area, Veterans Memorial Bridge (VMB) carries the Veterans Memorial Parkway and more than 22,000 vehicles a day between Portland and South Portland.  In 2009 the Maine DOT issued a design-build RFP to replace the narrow and deteriorating original span and requiring a 100-year service life for the new structure.  The winning team comprised Reed & Reed (Woolwich, ME; general contractor), T.Y. Lin International (Falmouth, ME; bridge designer), GZA Geoenvironmental (Portland, ME; geotechnical engineer) and R. J.

North Tarrant Express - Mega Project Successfully Wraps Up sticky icon

Precast MSE Retaining Walls

The North Tarrant Express (NTE) project is along one of the most congested highway corridors in the Dallas-Fort Worth region. This multiple-phased project will improve the mobility along I-35W, I-820 and SH 121/183 Airport Freeway. While the project adds four managed toll lanes, it also rebuilds the existing main lanes and frontage roads. The first segment of this Public-Private Partnership (P3) project was awarded to NTE Mobility Partners (NTEMP), a consortium of Cintra US, Meridiam Infrastructure, the Dallas Police and Fire Pension System, and W.W.