• April 27 2026

BIG TIMBER, Mont. — The Montana Department of Transportation (MDT) and its partner L&J Construction will be completing rehabilitation activities and guardrail upgrades on the bridge that crosses Interstate 90 (I-90) on Main Boulder Road just south of Big Timber.

Work is expected to begin the week of May 4 and last for approximately two months, weather and other unforeseen factors permitting.

Traffic control will be in place during construction. Motorists should expect single lane traffic controlled by temporary signals, 10-to-15-minute delays, and a width restriction of 11 feet. Wide loads are advised to find an alternate route. For the most up-to-date information regarding traffic conditions, visit 511mt.net.  

For more information, please email mdtprojectpi@mt.gov.

For more information about active MDT projects around the state, please visit our website and MDT’s five-year Tentative Construction Plan.

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Tags: News Releases and Construction