Idaho's St. Maries Bridges Replacement Starts This Fall

Tue August 29, 2017 - West Edition #18
Construction Equipment Guide

The St. Maries railroad bridge replacement project will begin in September.
The St. Maries railroad bridge replacement project will begin in September.
The St. Maries railroad bridge replacement project will begin in September.
The St. Joe River bridge also is scheduled to be replaced by the summer of 2019.

Two bridges on Idaho Highway 3 — one over the St. Maries River Railroad Company tracks and one over the St. Joe River in St. Maries — will be replaced starting in September, after Labor Day. The railroad bridge will be completed first, followed by the river bridge. The replacements are expected to finish by summer 2019.

The Idaho Transportation Department (ITD) is working with RSCI Inc. and J-U-B Engineers Inc. using a design-build process to provide a timely and cost-effective product.

“Design-build projects allow the design and construction professionals to directly work together,” said Nathan Herbst, ITD project manager. “The goal is that this approach will streamline the process and result in a more cost-effective solution for everyone.”

ITD's decision to use design-build was based on two factors:

• the project's central and impactful location to the St. Maries community and traveling public; and

• the complexity of replacing two adjacent bridges in less than two years.

Both bridges will be removed and replaced with structures that include one lane in each direction with a shoulder/bike lane and sidewalk on each side. Work also will include resurfacing the roadway, replacing guardrail and signs in several locations, enhancing pedestrian facilities to meet Americans with Disabilities Act standards, and realigning the intersections.

The schedule and impacts for the first phase are currently being established. Members of the public are invited to contact the project team with questions or comments by calling the project hotline at 208/292-8515 or by emailing

For more information, visit under “projects.”

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