SR 20 - Sharpes Corner Vicinity - Interchange

Project news

  • The intersection of SR 20 and SR 20 Spur is currently open as a single lane roundabout.
  • People who drive or bus through this area should plan for some delays as crews finish this project. Delay times vary and have been longest in the afternoon for those eastbound out of Anacortes.
  • Cyclists should us USBR 10 across the Tommy Thompson Trail for access to Anacortes and use Skagit County roads instead of Bike Route 3 to access Whidbey Island.
  • 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. are building two roundabouts to improve safety and improve mobility in this area. Crews have finished work on SR 20 and Miller/Gibralter roads on the way toward Deception Pass and Whidbey Island. Crews are now working on the two lane roundabout at the intersection of SR 20 and SR 20 Spur (Sharpes Corner). To improve safety in this corridor, once the roundabouts are built, barriers will prohibit left turn access in this stretch. 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 will build a bike and pedestrian trail on the south side of the intersection to help travelers connect to March's Point Road and the Thommy Thompson Trail in Anacortes.

Why is WSDOT improving 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 experience 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 can be severe and increase the chance of collisions. Traffic turning west toward Whidbey Island often backs up beyond the turn lane, leaving vehicles stopped on the highway, increasing the chance of rear-end collisions.

We’ve also heard from many of you that bike/pedestrian improvements are important, and we will make upgrades in for non-motorized traffic as well.

Project History
Many design options have been 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 is 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 will also include a roundabout at Miller-Gibralter Road intersection and build a pedestrian and bicycle trail along the highway.

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

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.
July 3, 2018: Around-the-clock closures complete.
Summer 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.