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SR 243 - Intersection Improvements - Complete July 2014

Complete July 31, 2014
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- A single lane roundabout has been constructed at MP 13.5 - the intersection of SR 243 and Road 24 SW in Mattawa in western Grant County.

 Click to enlarge View entire photo Before - SR 243 looking south

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Before - SR 243, looking north. 

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Before - Aerial view of the SR 243/Rd. 24 SW intersection.

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- a sketch of how a roundabout fits at the intersection.

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Complete July 2014


Construction began April 14 and was complete July 31.

This (I-2) Safety Improvement - Collision Prevention Project built a single lane roundabout on SR 243 in western Grant County at MP 13.94 - the intersection with Road 24 SW in Mattawa.

Why is WSDOT improving this intersection?
The SR 243 and Road 24 SW intersection handles an average of 5,800 vehicles per day and was experiencing a large number of crashes.  During the five years from Jan. 1, 2007 to Jan. 1, 2012 there were twenty one collisions involving forty three vehicles. Nine of those crashes resulted in two fatalities and twenty two serious injuries. The 12 other wrecks were property damage only.

This roundabout is anticipated to decrease the frequency and severity of accidents at the intersection.

According to the Insurance Institute for Highway Safety, roundabouts have been shown to reduce fatal collisions by 90 percent, injury collisions by 80 percent and total collisions by almost 40 percent. 

Some drivers are unsure how to properly drive cars in roundabouts and are sometimes even more concerned about how trucks get through them.  The answer to that is the truck apron - the raised, circular concrete pad around the center of a roundabout that acts like an extra lane for long vehicles. So when you’re driving a roundabout, and see a trailer riding up on that raised concrete circle, don’t worry. That’s what it’s there for. 

(Click on the roundabout links in the left column.) 

The End Result
A more efficient intersection with a reduced potential for serious collisions.

Project Benefits
- Reduces the potential for crashes.
- Makes it easier and faster to get onto the highway from Rd. 24 SW.

What is the project timeline?
Construction began April 14, 2014 and was complete July 31.

Financial Information

Financial Data for PIN 224300D
Funding Source Amount ($ in thousands)
2003 Gas Tax (Nickel Funding) $0
2005 Gas Tax (TPA) $0
Pre-Existing Funds (PEF) $2,488
CWA $0
Total $2,488

Project signage will reflect the cost of construction engineering, project bid award and sales tax.

This project was advertised on Jan. 13, 2014. Four qualified private contractor bids were opened Feb.27. On Feb. 28, Contract #8575 was awarded to West Company, Inc. of Spokane for $1,254,587.48, 8% over the engineering estimate.

How can I get more information?
Josh Patrick, Project Engineer
WSDOT North Central Region
2830 Euclid Ave.
Wenatchee, WA 98801-5916
Phone: (509) 667-2880 or toll free (888) 461-8816

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