Sunrise Powerlink Geotechnical
San Diego Gas and Electric (SDG&E) proposed a new 117-mile, high-voltage transmission line that will have a 1,000 megawatt capacity to transport renewable energy from...
US 89 Landslide
On February 20, 2013, a landslide occurred on U.S. 89 near Page, Arizona. More than 150 feet of roadway buckled causing the indefinite closure of...
Going to the Sun Road Rehabilitation
The Going-to-the-Sun Road in Glacier National Park was built in 1932, and is a narrow 52-mile paved highway. The National Park Service and Federal...
Denali National Park Landslide Mitigation
The National Park Service required landslide mitigation along the primary access road within Denali National Park. The project sites were located along steep...
Devil’s Slide Twin Tunnels
The Devil's Slide project consisted of constructing twin tube tunnels beneath San Pedro Mountain in San Mateo County, California. When completed, the 30-foot wide, 650-foot...
Hoover Dam Bypass
The Hoover Dam Bypass Project was conceived to address a number of issues related to the functionality of US 93 and its crossing of the...
Juneau Access Road
A road to provide access between Juneau and the continental road system has been proposed for decades. The only alternative to air transportation to and...
US 60, Silver King and Superior Streets
The Federal Highway Administration and Arizona Department of Transportation (ADOT) commissioned a study to evaluate the improvement and/or realignment of US Highway 60 from outside...
Lake Mead Intake No. 3
Southern Nevada Water Authority (SNWA) investigated the construction of a large diameter water-supply tunnel from their existing water treatment plant into Lake Mead’s Boulder Basin....