California Coastal Commission Approves Highway 255 Roundabout Near Samoa Bridge

EUREKA AND SAMOA, HUMBOLDT COUNTY — November 7, 2026. A new traffic design is coming to the intersection of Highway 255 and New Navy Base Road near the Samoa Bridge. The California Coastal Commission approved Caltrans’ plan to install a modular roundabout intended to make turning movements clearer and improve road safety.

How the intersection would change

Drivers approaching from different directions currently face an unusual mix of stop controls and yielding movements. A roundabout would establish a more consistent circulation pattern. The proposed design uses pavement changes, high-visibility posts and modular components rather than a large conventional raised central island.

Coastal setting and pedestrian safety

Caltrans also proposes additional signs, a lower approach speed limit, wider shoulders and crosswalks. The commission required design choices that account for the nearby dune environment, including sand-colored edging components, according to Lost Coast Outpost.

Construction timing

The current plan calls for work to begin in summer 2027, with an anticipated construction period of about 40 days. Those are planning estimates and may change as Caltrans finalizes scheduling and traffic control. Drivers should monitor Caltrans District 1 notices before expecting specific detours.

Source: Lost Coast Outpost, November 6, 2026; Caltrans project application reviewed by the California Coastal Commission.

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