Salt River Road Extension

City of St. Peters, Missouri

The extension is helping to relieve major congestion on highway I-70 by redirecting local traffic.


Horner & Shifrin provided design and construction administration for a new four-lane, 1.5 mile-long project included three four-lane bridges with a 10-foot-wide pedestrian/bicycle trail, as well as a traffic signal at the major intersection of Mid Rivers Mall Drive and Salt River road.

In addition, we provided an economical, cost effective yet innovative solution by designing a tight diamond interchange that minimized the number of right-of-way takings. The new roadway spans over two creeks and U.S. Army Corps of Engineers levees.

We were especially vigilant to make sure all project milestones were met and that all parties were kept apprised. The project had a moving target completion date, yet was completed on an accelerated schedule. The extension is helping to relieve congestion on I-70 by removing local traffic.



Site Size

1.5 miles


St. Peters, Missouri

Year Completed


Innovation. Agility.
Reliability. Horner & Shifrin.