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I-90 bridges near Cataldo

Both eastbound and westbound bridges will be replaced.

The structures near milepost 40 were first built in 1964. Given that the bridges are located in a floodplain, the design team will look for ways to mitigate risk in the new design.

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Graphic of staging during construction

Traffic impacts during I-90 bridge replacements

As shown in the graphic above, only one bridge will undergo work at a time. All traffic will be shifted onto the other bridge, with one lane available for each direction. The narrowed lanes are still expected to accommodate recreational traffic like trailers.

Work is expected to take two consecutive seasons, with no construction planned over the winter. Impacts are subject to change with further analysis, but at this time ramp closures are not considered necessary.

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Canyon Road Bridge

Just 400 feet upstream, Canyon Road also crosses the Coeur d’Alene River via a historic 1936 bridge owned by East Side Highway District. Given the proximity of the aging structures, ITD and the highway district are combining resources to determine the feasibility of replacing the local bridge along with the I-90 structures.

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Issues

The Canyon Road bridge is also susceptible to flooding and can no longer support loads above 12 tons (4.5 tons/axle), making it unusable as a detour for interstate traffic. This picture shows conditions in 1996.

These are a few of many factors that will be considered during the feasibility study, and public input will also play a role.

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I-90 Cataldo bridges

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