SR 20 - Sharpes Corner Vicinity - Interchange

Project news

  • Around-the-clock lane reductions started on Monday, April 2 at SR 20 and Miller/Gibralter roads. Flaggers are alternating traffic through this intersection.
  • Travelers who must travel through this area should plan for delays during this construction. Delay times vary based on how many drivers are trying to use the area, time of day and stage of construction.
  • Sign up for email updates about this project and other state roadwork in Island and Skagit counties.

The Sharpes Corner intersection experiences significant congestion, especially during the busy summer tourist season. Lengthy backups can extend out into 55 mph traffic, which increases the risk of high-speed, rear-end collisions. Crashes have also occured where short merge lanes zipper with 55 mph traffic.

Contractor crews from Tapani, Inc. are building two roundabouts to improve safety and improve mobility in this area. The first roundabout is going in on SR 20 and Miller/Gibralter roads on the way toward Deception Pass and Whidbey Island. Crews will follow by building one 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.

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
WSDOT originally designed improvement ideas for the SR 20 Sharpes Corner intersection near Anacortes before the project was shut down in 2009 when the funding was cut. Funding for design and construction was approved 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 and will help reduce the frequency and severity of collisions.

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. Bicycle and pedestrian improvements will increase safety and mobility in the area. 
  • 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 at designated facilities at 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.
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

Starting on April 2, 2018 contractor crews will start construction on intersection improvement work.

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

The final design of the Sharpes Corner roundabout.