Client: ConocoPhillips Alaska, Inc. (CPAI)
Location: North Slope, Alaska
PND was responsible for civil infrastructure design for ConocoPhillips' CD5 arctic resource development project on the North Slope of Alaska. The project involves a 6-mile gravel road, resource development gravel pad, four significant bridges, and a multiseason ice pad constructed over permafrost. The Nigliq Bridge is a 1,421-foot vehicle bridge across the Nigliq Channel of the Colville River. It's a box girder design with seven in-stream icebreaking piers. Its foundation system consists of three 48” piles embedded in complex geotechnical conditions ranging from thawed to permafrost soils and two icebreaker piles supporting a slanted icebreaker. Access to the site from existing infrastructure can only be provided in winter months via ice roads. Therefore, the bridge was launched during fall months to allow construction to occur during the offseason and to meet overall schedule.
For more information, click here. Contact any PND office for additional information about this and related resource development and Arctic region projects. A CPAI-produced video about this project can be found here.
The Nigliq Bridge won two national honors in 2018: the National Council of Structural Engineers Associations Excellence in Structural Engineering Awards Outstanding Project (New Bridges/Transportation Structures); and the National Steel Bridge Alliance Prize Bridge Award (Medium Span). Two years earlier in 2016, the bridge's national recognition marked the second consecutive year a PND-designed project was ranked on Roads & Bridges' annual Top 10 lists. In 2015, the Deweyville Trailhead to Neck Lake Road project in Prince of Wales, Alaska, for the Federal Highway Administration was ranked No. 1 on the magazine's roads list. In 2016, the Nigliq Bridge was ranked second on its bridges list. Read more about the Federal Highway Administration project here.