York Bridge, Federal Aid Secondary Route 280, Helena, Lewis and Clark County, MT

Significance: As a pin-connected Pennsylvania through truss structure, the bridge is not particularly significant for structural or engineering reasons. It is however, historically associated with the Helena Power Transmission Company and the building of the Hauser Dam, which was a significant early development in electrification of the state. Through their interest in the Helena River Transmission Company, York Bridge is also historically associated with the careers of two prominent Montana political and economic developers, Anton Holter and Samuel Hauser.
Survey number: HAER MT-2
Building/structure dates: 1906 Initial Construction
Building/structure dates: 1908 Subsequent Work
Building/structure dates: 1978 Subsequent Work
Building/structure dates: 1981 Demolished