SR 150 - No See-Um Road Intersection Improvements - Complete November 2017

Project news

  • Construction began April 17, 2017 and was complete by Thanksgiving.
  • A community ribbon cutting ceremony was held  Nov. 29.
  • Check this Roundabout page for how they work.

The legislature's 2015 "Connecting Washington" revenue package included $6.5 Million in final design, right of way and construction funding to build a roundabout at the SR 150/NoSeeUm Rd. intersection on the north shore of Lake Chelan.

Needs & benefits

This I-2 Highway Capital Improvement Program Collision Prevention Safety Project constructed improvements to the intersection of SR 150 and No See-Um Road between Manson and Chelan.

Why did WSDOT improve this intersection?
Even with hundreds of residential lots being developed that will be accessed through this intersection, the current average traffic count has already risen to 10,000 vehicles per day. These volumes produced more and longer delays for side-road traffic - the result of the lack of gaps to turn onto the highway. Faced with these conditions, drivers sometimes made decisions resulting in a collision or a near miss.

The roundabout is designed to reduce collisions, delays and improve bicycle and pedestrian mobility and access to Lake Chelan.

The End Result
A new intersection to accommodate higher traffic volumes while reducing the potential for serious collisions.

Project Benefits

  • Reduced potential for serious collisions and improved traffic flow
  • Better motorist information from new signs and striping
  • Extended roadway life with new pavement
  • Reduced maintenance costs 


The 2015 Connecting Washington budget included $6.5 Million for design, acquisition of right of way and construction of the roundabout.
The project required some 400 work days to complete.  Work began in April of 2017 with final completion (permanent pavement markings that couldn't be applied freezing temperatures) in 2018.


Funding Source Amount ($ in thousands)

  • Pre-Existing Funds (PEF) $1,166
  • CWA $6,500
  • Total $7,666


David Kieninger
Project Engineer
WSDOT North Central Region
1551 N. Wenatchee Ave.
Wenatchee, WA 98807
Phone: (509) 667-2860 or toll free (888) 461-8816