Petroleum County Bridge Report Card

Petroleum County scores 40 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.

F40 / 100

Local infrastructure snapshot

Petroleum County, Montana

Petroleum County has 26 bridges in the National Bridge Inventory, with 4 rated poor and 2 rated scour-critical. Its poor-condition share of 15.4% is above the 7.4% statewide average. Poor-condition bridges carry about 435 daily vehicle crossings.

26Total Bridges

4Poor (15.4%)

14Fair (53.8%)

2Scour-Critical

Quote-Ready Local Facts

15.4%of county bridges are in poor condition, compared with 7.4% statewide and 6.7% nationally.

435daily vehicle crossings are on poor-condition bridges in the county.

2bridges are rated scour-critical, or 7.7% of the county bridge inventory.

Copyable Facts for Reporters

BridgeLookup.com gives Petroleum County a Bridge Condition Exposure Score of 40/100 (F). The county has 26 bridges in the National Bridge Inventory, including 4 in poor condition and 2 rated scour-critical. Poor-condition bridges carry about 435 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	15.4%	30.8
Poor-condition traffic exposure	25	13.2% of measured traffic	9.9
Scour-critical bridge share	20	7.7%	15.4
Average age vs national baseline	10	59 years vs 48 nationally	4.4
Traffic-data completeness	5	3,298 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	15.4%
State Poor-Condition Share	7.4%
National Poor-Condition Share	6.7%
County Scour-Critical Share	7.7%
Average Bridge Age	59 years
Poor-Condition Traffic Exposure	435 vehicles/day

Bridges to Watch

Busiest Poor-Condition BridgeS 244 over Yellow Water Cr-elk CR — 233 vehicles/day Oldest Listed BridgeOld Cat Creek RD over Box Elder Creek 008 — built in 1930 All County BridgesBrowse every bridge record in Petroleum County.

Top Bridges to Watch in Petroleum County

Bridge	Reason	Condition	Daily Traffic	Year Built
Old Cat Creek RD over Box Elder Creek 008	Poor condition + traffic exposure	Poor	100	1930
Road 317 over Drag Creek	Poor condition + traffic exposure	Poor	2	1963
S 244 over Yellow Water Cr-elk CR	Poor condition + traffic exposure	Poor	233	1948
Hughes LN over Flatwillow Creek 016	Poor condition + traffic exposure	Poor	100	1950
S 200 over Box Elder Creek	High traffic	Fair	539	1953
S 244 over Mcdonald Creek	High traffic	Fair	245	1941
S 244 over Drainage	High traffic	Fair	233	1935
S 244 over Pike Creek	High traffic	Fair	233	1939
S 244 over Flatwillow Creek	High traffic	Fair	208	1939
S 244 over Drainage	High traffic	Fair	208	1940

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.