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I-86 Raft River Bridge Replacements

Replacement of the structures will improve travel.

The Idaho Transportation Department (ITD) is planning replacement of two Interstate 86 bridges and the adjacent Baseline Road bridge spanning the Raft River in Cassia County. The bridges are located close to the Raft River Interchange near milepost 14.

Why?
The bridges have exceeded their life expectancy.
What?
New taller and wider bridges.
When?
Construction is scheduled to start early in 2019.
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Project Background

Built in 1930 and 1960, the current bridges each span approximately 50 feet. Although adequate at the time of construction, these bridges have exceeded their life expectancy.

In 2017, flooding occurred on the roadway around the structures causing a three day closure of the interstate that severed transportation for thousands of motorist throughout south-central Idaho. There have also been problems with excessive sediment buildup in the area. These issues, combined with the age of the structures, have made the need for replacement necessary.

Project Description

The project involves replacing the aging I-86 west bound and east bound bridges, and the adjacent Baseline Road bridge with higher and wider structures. As a result, the roadway will also be raised in this area.

The structures will be built within ITD right-of-way and be wide enough to accommodate two 12-foot lanes, as well as 10-foot and 4-foot shoulders. The new bridges will be constructed with an increased overall height (approximately 9 ½ foot for the I-86 bridges and 8 foot for the Baseline Road bridge) in order to better accommodate the flow of the river.

Construction is anticipated to start in the spring of 2019 and expected to last a year. The budget for this project is approximately 12 million dollars.

Project Description

The project involves replacing the aging I-86 west bound and east bound bridges, and the adjacent Baseline Road bridge with higher and wider structures. As a result, the roadway will also be raised in this area.

The structures will be built within ITD right-of-way and be wide enough to accommodate two 12-foot lanes, as well as 10-foot and 4-foot shoulders. The new bridges will be constructed with an increased overall height (approximately 9 ½ foot for the I-86 bridges and 8 foot for the Baseline Road bridge) in order to better accommodate the flow of the river.

Construction is anticipated to start in the spring of 2019 and expected to last two years. The budget for this project is approximately 12 million dollars.

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