Samoa Bridge Route 255 Closed Overnight Jan. 25–30; US-101 Detour

Route 255’s Samoa Bridge is closed to all traffic overnight from 8 p.m. to 6 a.m. through Friday morning, Jan. 30, diverting late-night travel off the bridge and onto U.S. 101. The closure affects the stretch from U.S. 101 (Fourth Street) to just south of Woodley Island and reflects safety measures and infrastructure work that require full closures rather than alternating traffic control.

The closure began Sunday evening, Jan. 25. Crews are performing both bridge repairs and broadband work during the overnight hours. Caltrans District 1 says limited space on the bridge to protect workers makes a full overnight closure necessary rather than allowing one-way traffic control. A turnaround is available for southbound travelers heading toward Eureka, and U.S. 101 will be available as the detour route.

For Humboldt County residents the timing and location matter. Night-shift hospital staff, commercial drivers making overnight deliveries, late ferry or harbor workers, and anyone who normally uses the Samoa Bridge after dark must plan around the detour and allow extra travel time. Motorists should follow posted signage and the available turnaround for southbound traffic headed toward Eureka; northbound and island-bound drivers will be routed onto U.S. 101 where space and traffic control accommodate the detour.

The work combines traditional bridge maintenance with broadband installation, reflecting broader efforts to keep both physical and digital infrastructure functioning. For a coastal community like Eureka and the Samoa Peninsula, broadband upgrades can affect local businesses, remote work capacity, and communications resilience even as bridge repairs maintain the physical link across Humboldt Bay. Executing such projects during overnight hours aims to limit disruption to daytime commuters, but it shifts the inconvenience to night travelers and commercial operations that rely on after-dark movement.

Caltrans’ decision to close Route 255 overnight rather than stage one-way traffic underscores safety priorities where narrow work zones cannot safely separate crews from moving vehicles. Expect increased signage and traffic control at the Fourth Street approach and near Woodley Island during the closure hours. Local agencies and employers that schedule overnight shifts may wish to alert employees and contractors to the detour and build extra time into routes.

As the work proceeds through Jan. 30, commuters should plan trips outside the 8 p.m.-6 a.m. window when possible and allow additional time if travel during those hours is unavoidable. Monitor Caltrans District 1 for any schedule changes or updates as crews complete both bridge and broadband tasks and reopen Route 255 to overnight traffic.