CONTACT & LOCATIONS NEWS MARKETS SERVICES PROJECTS ABOUT CAREERS PROJECTS Seward Highway Rehabilitation Milepost 75-90 CLIENT Alaska Department of Transportation LOCATION Turnagain Arm, AK The Seward Highway Rehabilitation project involves the widening and realignment of 15 miles of roadway, as well as replacing eight bridges. This area of Southcentral Alaska exhibited severe subsidence and infrastructure failure during the 1964 Great Alaska Earthquake, and design of the new embankment and bridges must accommodate the potential effects from future earthquake events. The Seward Highway serves as the sole vehicular transportation route between Southcentral Alaska and the Kenai Peninsula, and is heavily traveled, especially in the summer. Shannon & Wilson assembled a team to conduct geotechnical explorations, which included more than 100 geotechnical borings, down hole shear wave velocity measurements, and seismic refraction. We completed this work to support recommendations for embankment and bridge foundations, as well as borrow source development along the alignment. The project encountered significant challenges, including marine mammal observers (Beluga Whale watch) for overwater exploration work; coordination with the Alaska Railroad; adherence to permit stipulations from Alaska DNR, USACE, ADF&G and UFSF; and potential deep liquefaction hazards at the bridge locations. MARKETS SERVED Transportation Highways / Roads Rivers / Shorelines / Wetlands SERVICES PROVIDED Laboratory Geotechnical Engineering Geologic Hazards OFFICE Anchorage KEY PERSONNEL Kyle Brennan Vice President, Anchorage Office Manager Ryan Collins Senior Geologist Stafford Glashan Senior Engineer Thomas Keatts Senior Engineer Brentton Leeper Geotechnical Staff MORE PROJECTS SR 520 Floating Bridge And Landings Project Highways/Roads Transportation READ MORE Beacon Hill Link Light Rail Project Transit Rail READ MORE Beartooth Highway Emergency Repairs Transportation Highways/Roads READ MORE Cleveland Innerbelt Transportation Highways/Roads READ MORE MARKETS Transportation Water Property Development Industrial Federal SERVICES Geotechnical Engineering Contamination / Remediation Geologic Hazards Natural Resources Water Resources Design-Build Tunneling / Underground Arctic Engineering Construction Management Specialty Services ABOUT The Company People Corporate Responsibility/Scholarships CONTACT & LOCATIONS Seattle Anchorage Chicago Denver Fairbanks Jacksonville Los Angeles Madison Portland Sacramento Salt Lake City St. Louis Tri-Cities PROJECTS Explore CAREERS Working At Shannon & Wilson CONTACT & LOCATIONS NEWS CLIENT PORTAL © 2021 SHANNON & WILSON, INC. SEATTLE WEBSITE DESIGN