Silver Bow County Bridge Report Card

Silver Bow County scores 93 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.

A93 / 100

Local infrastructure snapshot

Silver Bow County, Montana

Silver Bow County has 70 bridges in the National Bridge Inventory, with 2 rated poor and 0 rated scour-critical. Its poor-condition share of 2.9% is at or below the 7.4% statewide average. Poor-condition bridges carry about 200 daily vehicle crossings.

70Total Bridges

2Poor (2.9%)

57Fair (81.4%)

0Scour-Critical

Quote-Ready Local Facts

2.9%of county bridges are in poor condition, compared with 7.4% statewide and 6.7% nationally.

200daily vehicle crossings are on poor-condition bridges in the county.

0bridges are rated scour-critical, or 0.0% of the county bridge inventory.

Copyable Facts for Reporters

BridgeLookup.com gives Silver Bow County a Bridge Condition Exposure Score of 93/100 (A). The county has 70 bridges in the National Bridge Inventory, including 2 in poor condition and 0 rated scour-critical. Poor-condition bridges carry about 200 daily vehicle crossings. Poor condition does not mean unsafe; bridges judged unsafe are closed or restricted by transportation agencies.

Download all county report-card scores as CSV.

How the Score Breaks Down

Factor	Weight	County Value	Penalty
Poor-condition bridge share	40	2.9%	5.7
Poor-condition traffic exposure	25	0.1% of measured traffic	0.1
Scour-critical bridge share	20	0.0%	0.0
Average age vs national baseline	10	52 years vs 48 nationally	1.7
Traffic-data completeness	5	275,629 measured daily crossings	0.0

Score = 100 minus weighted penalties. The score is a comparative research signal, not an official safety rating. Read the full methodology.

County Comparisons

County Poor-Condition Share	2.9%
State Poor-Condition Share	7.4%
National Poor-Condition Share	6.7%
County Scour-Critical Share	0.0%
Average Bridge Age	52 years
Poor-Condition Traffic Exposure	200 vehicles/day

Bridges to Watch

Busiest Poor-Condition BridgeEmpire Street over Drainage — 100 vehicles/day Oldest Listed BridgePumphouse RD over Big Hole River 009 — built in 1914 All County BridgesBrowse every bridge record in Silver Bow County.

Top Bridges to Watch in Silver Bow County

Bridge	Reason	Condition	Daily Traffic	Year Built
Empire Street over Drainage	Poor condition + traffic exposure	Poor	100	1953
German Gulch RD over Int Victor I 15 003	Poor condition + traffic exposure	Poor	100	1961
I 15 over Bell Creek	High traffic	Fair	19,755	1963
I-90 E&w over Abandoned Railroad	High traffic	Good	15,011	2019
S Montana ST over Silver Bow Creek	High traffic	Fair	14,718	1970
I 15 over Int Rocker	High traffic	Fair	10,824	1968
I 15 over Int Rocker	High traffic	Fair	10,824	1968
I 90 over Whitetail Creek	High traffic	Fair	10,349	1965
I 15 over Int S Montana Street	High traffic	Fair	9,878	1961
I 15 over Int S Montana Street	High traffic	Fair	9,878	1961

Important safety note

Poor condition does not mean a bridge is unsafe. It means at least one major component has significant deterioration and the bridge is a priority for maintenance, repair, or replacement. Bridges judged unsafe are closed or restricted by transportation agencies.