This 20-span, 3,300-foot bridge is the longest in Alaska, and is the first key component of an ambitious project undertaken by the Alaska Railroad Corporation to expand its northern rail line from its northern terminus.
PDC performed surveys for this railway extension and bridge project over a 10-year contract. Aggressive field and office delivery schedules were the norm from the outset in 2005, starting with the initial control survey for the 80 mile rail corridor from Eielson Air Base to Fort Greely south of Delta Junction. PDC performed static GPS and conventional control surveys, helicopter-borne photo control surveys, engineering design surveys, ROW mapping surveys, bridge site surveys, rail centerline surveys, ordinary high water surveys, LiDAR mapping check surveys, remote hydrographic surveys to support hydraulics models, and contractor QA/QC surveys in extreme winter conditions. To further support this project, PDC surveyors prepared ROW plans and acquisition parcel plats, subdivision plats, and three Alaska Department of Natural Resources records of survey to cover the bridge, access road, and protective levee.
The $187 million bridge was commissioned in 2014.