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Beginning July 9, 2018, the Montana Dept. of Transportation will close Zimmerman Trail for approximately three (3) months for a construction project. This project generally consists of shoulder widening, resurfacing, new guardrail, storm drainage, safety features and automatic gates. Anyone coming to and going from the Airport that utilizes Zimmerman Trail as part of their route should plan to use an alternate route for the July 9 - October closure period.