Knox Butte Road / Scravel Hill Road Roundabout

Linn County Road Department

Capital Improvements

Knox Butte Road / Scravel Hill Road Roundabout

Project Description:

This project is intended to provide transportation improvements to alleviate the safety concerns at the intersection of Knox Butte Road and Scravel Hill Road.  This intersection is a 2-way stop-controlled intersection. The through traffic is traveling east/west on Knox Butte Road and the stop-controlled traffic is traveling north/south on Scravel Hill Road. The posted speed on westbound Knox Butte Road is 55 mph and reduces to 45 mph approximately 125 feet past the intersection. The posted speed on eastbound Knox Butte Road is 45 mph. The posted speed on Scravel Hill Road (stop-controlled) is 55 mph. The west and south legs of the intersection are flat and level, the north leg consists of a vertical and horizontal curve and has limited sight distance, and the east leg of the intersection is on a skew.

Scravel Hill Road acts as an unofficial detour for I-5. Due to the sight distance, skewed geometry, and the need to reduce speeds through the intersection, the construction of a roundabout would be the most appropriate safety improvement for this location. This proposal would accommodate a roundabout design consistent with the existing roundabout located west of this intersection at the intersection of Knox Butte Road and Timber Street. The design would consider and accommodate appropriate truck traffic. 

Estimated Project Cost: $5,320,010

Funding Requests:

• 2022 - AAMPO Surface Transportation Block Grant (STBG)
  • Unsuccessful
• 2023 – All Roads Transportation Safety (ARTS)
  • Evaluation in process
• 2025 – Rural and Tribal Assistance Pilot Program
  • Application due in March 2025

County Facility Number: CR0035, CR0007, and CR0327

• Project Number: TBD

Please email roads@co.linn.or.us if you have any comments or questions regarding this project.