Update: Starting Monday, June 22 NE Risto Road will be closed between NE 176th and NE 182nd avenues and NE 182nd Avenue will be closed between NE Risto Road to where the road crosses Salmon Creek. The closure will reopen by August 14, 2026.
Public Works will replace the existing intersection at Northeast 182nd Avenue/Northeast Risto Road with a roundabout. Additionally, the curve at Northeast 199th Street and Northeast Risto Road will be flattened. Northeast 199th Street will be resurfaced from Northeast 167th Avenue to the Salmon Creek Bridge at Northeast 182nd Avenue. After the roadway is overlayed, a high friction surface treatment will be applied on the curve at Northeast 199th Street and Northeast Risto Road.
Construction begins May 2026 and will finish in fall 2026. A road closure will occur June 2026 through August 2026. The county will work with local residents to maintain access to their property during construction.
These changes will increase the safety and reliability of travel along this route, and reduce traffic congestion. Other safety enhancements will include an electronic speed feedback sign, raised pavement markers, and shoulder and pavement widening.
Starting late June 2026 until August 2026 there will be a road closure. This map shows the detour drivers should take.
The single-lane roundabout’s design balances safer curves with reducing impacts to adjacent sensitive environments. The center, landscaped island will be raised about three to six feet above the roadway so drivers can easily see it as they approach. The roundabout is large enough for a WB-62 truck with a trailer, while still keeping vehicle speeds low, as recommended for single-lane roundabouts. A concrete, drivable truck apron on the inside edge of the travel lane will allow large vehicles to make the turn safely.
Northeast Risto Road, Northeast 182nd Avenue and Northeast Lakin Road will connect to the roundabout. The project also includes intersection improvements at the intersection of Northeast 199th Street, Northeast 176th Avenue and Northeast Risto Road.
Crash data is collected at the beginning of the project. Information is taken from three sources: Clark County Department of Public Works, Clark County GIS data files, and the Washington State Department of Transportation. The data was collected over a five-year period (January 1, 2015, to December 31, 2019) before the design of the project. Over the five-year period, a total of eleven crashes were reported at the study intersection, including angle, turning, and fixed object collisions.
Roundabouts keep traffic moving safely and steadily. Studies have shown that roundabouts are safer than stop sign or signal-controlled intersections. Roundabouts reduced injury crashes by 75 percent at intersections where stop signs or signals were previously used for traffic control, according to a study by the Insurance Institute for Highway Safety (IIHS). Studies by the IIHS and Federal Highway Administration have shown that roundabouts typically achieve:
A 37 percent reduction in overall collisions.
A 75 percent reduction in injury collisions.
A 90 percent reduction in fatality collisions.
A 40 percent reduction in pedestrian collisions.
There are several reasons why roundabouts help reduce the likelihood and severity of collisions:
Low travel speeds: Drivers must slow down and yield to traffic before entering a roundabout. Speeds in a roundabout are typically between 15 and 20 mph. The collisions that occur in roundabouts are typically minor and cause fewer injuries since they occur at lower speeds.
No light to beat: Roundabouts are designed to promote a continuous, circular flow of traffic. Drivers only need to yield to traffic before entering a roundabout; if there is no traffic in the roundabout, drivers are not required to stop. Because traffic is constantly flowing through the intersection, drivers don't have the incentive to speed up to try and "beat the light," like they might at a signal-controlled intersection.
One-way travel: Roads entering a roundabout are gently curved to direct drivers into the intersection and help them travel counterclockwise around the roundabout. The curved roads and one-way travel around the roundabout eliminate the possibility of T-bone and head-on collisions.
Design of the new intersection is nearly complete.
Public Works incorporates resident input when feasible. County projects are designed by professional engineers. We balance community input with other considerations to create the best possible final design. Considerations include legal requirements, environmental impacts, budget and safety. Input among residents, user groups and stakeholders often differs. While we do our best to incorporate resident input, we are not able incorporate all input or requests. If you have questions or concerns about the final project design, we invite you to learn more on our website or contact the project manager.
Schedule
Design: 2020 – spring 2025 Construction: spring 2026 - fall 2026
Funding
The project is anticipated to cost $3,822,000. A State Grant from County Road Administration Board/Rural Arterial Program (CRAB/RAP) will pay for $1,200,000. A Federal Grant from Surface Transportation Rural (STP-R) will pay for $450,000. County funding through Traffic Impact Fees (TIF), County Road Fund (CPF) and Real Estate Excise Tax 2 (REET 2) will pay for the remaining portion of the costs.
