SR 510 at McAllister/Rockcress Roundabout Pre-Design Study

Funding for this roundabout project comes from the Highway Safety Improvement Program. The cost estimate for the project is between $1,000,000 - $2,000,000*.

*This cost is a rough estimate and subject to change based on final design factors and project award.

Plans are underway to construct a single-lane roundabout on SR 510 at the intersection of McAllister Court SE/Rockcress Drive SE beginning summer of 2024. The single-lane roundabout is smaller than a standard roundabout.

WSDOT designs these roundabouts to accommodate vehicles of all sizes, including emergency vehicles, buses, and trucks and trailer combinations. The flexible design provides curbing and a center island that large vehicles can drive over, if needed.

Pedestrians and cyclists are not common at this location. This intersection is located on an Intercity Transit route. This project will take a closer look into these factors in the design phase of the roundabout project.

George Mazur
Multimodal Planning Manager
George.Mazur@wsdot.wa.gov
360-357-2651

Matthew Pahs
Study Lead
Matthew.Pahs@wsdot.wa.gov
360-357-2791