Lewis and Clark County received a Treasure State Endowment Program (TSEP) planning grant in 2017 to complete a County-wide Bridge Evaluation and Capital Improvement Plan (CIP) and complete a Preliminary Engineering Reports (PER) for the Dalton Mountain Road Bridge.

An initial bridge inventory and bridge CIP was completed nearly two decades ago. The document was updated in 2000, 2002, 2008, 2012, and most recently in 2016. Since the original bridge inventory, the County has replaced or rebuilt more than fifty bridges. The bridges that Lewis and Clark County are responsible for are located throughout four County Road Districts; Helena, Wolf Creek, Augusta, and Lincoln, totaling 90 bridges. Lewis and Clark County has a progressive bridge maintenance program and has been proactive at maintaining, repairing, and replacing bridges as needed to be fiscally responsible and protect public safety.

The County has elected to complete a PER for the Dalton Mountain Bridge over the Blackfoot River, located just west of Lincoln, Montana.  The existing structure is a four-span, 110-foot long timber bridge constructed in 1956 with deterioration of the timber substructure. The PER will evaluate improvement options for the Dalton Mountain Bridge and be the basis for the County to apply for TSEP funding to complete the construction project and make necessary improvements.