Boulder is a town in and the county seat of Jefferson County, Montana, United States.[4] It is on the north bank of the Boulder River between Butte and Helena, slightly east of the Continental Divide, at the intersection of Interstate 15 and Montana Highway 69. The population was 1,183 at the 2010 census.
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Helena Office
3530 Centennial Drive
Helena, MT 59601
(406) 442-8594
Regional Manager:
Robie Culver
Bozeman Office
851 Bridger Drive, Suite 1
Bozeman, MT 59715
(406) 522-8594
Regional Manager:
Zach Lowe, P.E.
Billings Office
2223 Montana Ave, Suite 201
Billings, MT 59101
(406) 601-4055
Regional Manager:
Dax Simek, P.E.
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