Old Coulee Rd. 9433 serves as a “Farm to Market,” route and as a FCC 07 rural major collector route between Grand Coulee, WA to the North and Almira, WA to the South. The main intersecting routes within the projects limits are Bagdad Rd. on the North end and Douglas Road on the South end. This route is also classified as a T4 on the CFGS.
The project limits were stationed from Mile Post 8.07 to Mile Post 12.15.
This project was the second portion of Old Coulee Rd. to be reconstructed in the last 5 years. In 2013-2014, construction of Section 1 of Old Coulee Rd. from MP 12.15 to 13.96 was conducted.
There were multiple deficiencies along this section of road that were in dire need of repairs and improvements. The surfacing showed signs of rutting, cracking & multiple patches. Multiple vertical curves that needed to be cut down and/or filled up in order to improve safety with traveling and sight distance. Several drainage structures were either damaged beyond repair or in need of engineering enhancements to improve efficiency with hydraulic relief. The overall roadway width had been compromised over the years with broken shoulders which promoted the loss of in slopes.
Existing road surface was ground up and areas of unsuitable subgrade materials were removed. The asphalt grindings along with other materials were used to create a far superior subgrade. The entire roadway prism was widened and new back slopes were created to allow for easier agricultural efforts to neighboring landowners. Unsafe vertical curves were reduced by removing the peaks of curves and utilizing the cut material in areas at the bottom of the curves for filling low spots. After existing surfacing was ground, the new subgrade was built outward to create a wider roadway and a safe traveling surface. Finally, multiple culverts and drainage structures were enhanced in length or completely removed and replaced with new, more efficient drainage facilities.