Nehalem River Bridge (Lommen Bridge)

Location: Tillamook County, OR
Client: Tillamook County Public Works

Otak provided engineering and construction management services for the replacement of Lommen Bridge. The existing 382-foot-long bridge was structurally deficient with severe cracking throughout the bridge and scour critical with bridge footings exposed. The project’s primary challenges included the flood and debris risk associated with the crossing, as well as coastal factors and environmental compliance issues. The Otak team prepared an alternatives analysis, design acceptance package, and final design plans, specifications, and estimate for a longer, wider bridge with a scour and debris resistant deep foundation system. The Otak construction services team has worked closely with Tillamook County and ODOT to facilitate a Cost Reduction Proposal that modified the bridge superstructure and drastically reduced environmental impacts and reduced what would have been an extremely aggressive schedule for summer in-water work. Otak’s services included project management, bridge and roadway design, hydraulics analysis/river modeling, stormwater analysis, and construction management/inspection.

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