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US 101 - Middle Nemah River Bridge Replacement


April 2014

  • This week's traffic impacts
  • Lynn Point Road, which intersects with US 101 just south of the Middle Nemah River Bridge, has been realigned to create a safer connection with the highway.
  • Traffic has been shifted to a single-lane, detour bridge, and the speed limit temporarly reduced to 25 mph through the project area. Expect delays during weekend and holiday travels.

This project replaces the existing US 101, Middle Nemah River Bridge (milepost 33.84) with a new 36-foot-wide structure consisting of two 12-foot-wide lanes with six-foot-wide shoulders.

The new bridge will help improve safety and increase mobility on US 101 in Pacific County.

During construction, WSDOT will build a temporary one-lane bridge on the west side of the existing Middle Nemah River Bridge to detour traffic around the work zone.

Why is WSDOT constructing a new US 101, Middle Nemah River Bridge?
The existing bridge was constructed in 1935 of timber trestles.

The bridge is aging and too narrow to accommodate the types or number of vehicles that need to cross it today. It also does not meet current federal seismic, flood, or structural standards.

WSDOT is replacing the existing structure with a new bridge span built of concrete girders. The new bridge will enhance safety and allow US 101 to remain a viable West Coast freight route.

The End Result
A wider, safer bridge that accommodates today's traffic and meets current federal seismic, flood and structural standards.

Project Benefits

  • Safety: Improves safety and drivability by constructing a wider roadway, and installing concrete road barriers and new bridge railings.
  • Mobility: Provides a wider structure for motorists and allows traffic to flow smoothly across the bridge without delay.
  • Environmental: Removes approximately 44 creosote-treated timber piles from Middle Nemah River and restores an estimated 28 square feet of streambed. The project also improves the river channel under US 101.

What is the project timeline?

  • 2009: Preliminary design and environmental documentation begins.
  • Spring 2011: Right-of-Way Acquisition process begins.
  • Winter 2011: Design work and Right-of-Way Acquisitions completed.
  • August, 2012: Project awarded to SB Structures LLC. for construction.
  • Spring 2013: Construction scheduled to begin.
  • 2014: Construction scheduled for completion.

Financial Information

Financial Data for PIN 410104A
Funding Source Amount ($ in thousands)
2003 Gas Tax (Nickel Funding) $0
2005 Gas Tax (TPA) $776
Pre-Existing Funds (PEF) $4,107
Total $4,882

Project signage will reflect the cost of construction engineering, project bid award and sales tax.

How can I get more information?
Area Engineer Lori Figone 
WSDOT Kelso Area Engineering Office
2400 Talley Way
Kelso, WA 98626
Phone: 360-442-1341, or toll free 1-800-545-1393

Magan Reed
WSDOT Communications
11018 NE 51st Circle
Vancouver, WA 98682
Phone: 360-905-2057

or access our project feedback form.

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