SR 20 - Sharpes Corner Vicinity - Interchange

Project news

  • The intersection of SR 20 and SR 20 Spur is now open as a double lane roundabout.
  • Cyclists can use the new bike and pedestrian trail to connect from USBR 10 to Bike Route 3 toward Whidbey Island.
  • Contractor crews will return in September to plant landscaping and apply permanant striping.
  • Sign up for email updates about this project and other state roadwork in Island and Skagit counties and view photos of the progress which are updated each week.

Contractor crews from Tapani, Inc. built two roundabouts to improve safety and improve mobility through this area. Crews have finished both roundabouts, one at SR 20 and SR 20 Spur (Sharpes Corner) and another just south, at SR 20 and Miller and Gibralter roads. To improve safety in this corridor, barriers were installed to make this corridor a right-in right out only area. Instead of taking a left, travelers will need to go to a roundabout and make a U-turn to then make a safe right turn into driveways in this area. It is .5 miles between the two roundabouts. In addition to the roundabouts, WSDOT crews built a bike and pedestrian trail on the south side of the intersection to help travelers connect to between US Bike Route 10 which runs along SR 20 in Skagit County and Bike Route 3 down SR 20 on Whidbey Island.

Why did WSDOT improve the Sharpes Corner intersection?
SR 20 is the only land access to the city of Oak Harbor, the Whidbey Island Naval Air Station and the rest of Whidbey Island. SR 20 Spur is the primary access to Anacortes and ferry service to the San Juan Islands and Sidney, B.C. As a result, the intersection of these two roadways has significant regional importance to those who live on and visit the islands. This area experienced heavy congestion during the busy tourist months, especially on summer weekends.

On average, more than 30,000 vehicles pass through the Sharpes Corner intersection every day, creating heavy traffic congestion. Backups were severe and increased the chance of collisions. Traffic turning west toward Whidbey Island often backed up beyond the turn lane, leaving vehicles stopped on the highway, increasing the chance of rear-end collisions.

We also heard from many of you that bike/pedestrian improvements are important and needed in this area so those improvements were included in project plans.

Project History
Many design options were discussed during the 10 year history of this project. Funding for the original project was cut in 2009 and then refunded by the Legislature in July 2015 as part of the Connecting Washington Revenue Package.

Based on the previous analysis, new design work and community involvement, it was determined that a roundabout was the practical solution at this busy intersection to relieve the problems the community identified - safety and congestion. To improve mobility throughout the entire area, the project design also included a roundabout at the Miller Gibralter roads intersection, right-in right-out only access through the corridor and a pedestrian and bicycle trail along the highway.

The End Result
Improving this intersection and the surrounding area will improve traffic flow, help improve safety by reducing the frequency and severity of collisions and will lower amount of time vehicles spend idling.

Needs & benefits

  • Safety: Improvements to these intersections will increase traffic flow and decreases the risk of rear-end collisions, making the roadway safer for drivers.
  • Congestion relief: Drivers will see significant increases in roadway capacity and traffic flow. This means shorter drive times and less time sitting in traffic.
  • Non-motorized improvements: A multi-use path and additional crosswalks will be added in the area between Sharpes Corner and Marches Point Road for pedestrians and cyclists. Additional signs will be added to increase safety.
  • Environment: We will make improvements to stormwater culverts and detention ponds where necessary to meet current WSDOT environmental standards.


Fall 2017: Advertise project for competitive bidding.
April 2, 2018: Project start date.
June 23, 2018: Crews opened the Sharpes Corner roundabout, 10 days ahead of schedule.
Late summer/early fall 2018: Project complete.


Financial Data for PIN 102029K
Funding Source Amount ($ in thousands)
2003 Gas Tax (Nickel Funding) $0
2005 Gas Tax (TPA) $0
Pre-Existing Funds (PEF) $0
CWA $13,400
Total $13,400


Andrea E. Petrich

Gabe Ng 
Project Engineer 

SR 20 - Sharpes Corner Vicinity - Interchange - Project map thumbnail

This roundabout project is happening at the intersection of SR 20 and SR 20 Spur in Anacortes.

SR 20 Sharpes Corner

On April 2, 2018 contractor crews started construction on this intersection improvement project.

SR 20 - Sharpes Corner Vicinity - Final Design - SR 20 and SR 20 Spur

The final design of the Sharpes Corner roundabout.