Madison County Bridge Report Card

Madison County scores 67 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.

D67 / 100

Local infrastructure snapshot

Madison County, Montana

Madison County has 98 bridges in the National Bridge Inventory, with 7 rated poor and 6 rated scour-critical. Its poor-condition share of 7.1% is at or below the 7.4% statewide average. Poor-condition bridges carry about 7,036 daily vehicle crossings.

98Total Bridges

7Poor (7.1%)

57Fair (58.2%)

6Scour-Critical

Quote-Ready Local Facts

7.1%of county bridges are in poor condition, compared with 7.4% statewide and 6.7% nationally.

7,036daily vehicle crossings are on poor-condition bridges in the county.

6bridges are rated scour-critical, or 6.1% of the county bridge inventory.

Copyable Facts for Reporters

BridgeLookup.com gives Madison County a Bridge Condition Exposure Score of 67/100 (D). The county has 98 bridges in the National Bridge Inventory, including 7 in poor condition and 6 rated scour-critical. Poor-condition bridges carry about 7,036 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	7.1%	14.3
Poor-condition traffic exposure	25	8.2% of measured traffic	6.2
Scour-critical bridge share	20	6.1%	12.2
Average age vs national baseline	10	43 years vs 48 nationally	0.0
Traffic-data completeness	5	85,559 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	7.1%
State Poor-Condition Share	7.4%
National Poor-Condition Share	6.7%
County Scour-Critical Share	6.1%
Average Bridge Age	43 years
Poor-Condition Traffic Exposure	7,036 vehicles/day

Bridges to Watch

Busiest Poor-Condition BridgeUS 287 over South Willow Creek — 4,102 vehicles/day Oldest Listed BridgeSundance Bench RD over Madison River 046 — built in 1902 All County BridgesBrowse every bridge record in Madison County.

Top Bridges to Watch in Madison County

Bridge	Reason	Condition	Daily Traffic	Year Built
Silver Spring RD over Ruby River 023	Poor condition + traffic exposure	Poor	133	1927
Seyler LN over Ruby River 019	Poor condition + traffic exposure	Poor	100	1976
US 287 over South Willow Creek	Poor condition + traffic exposure	Poor	4,102	1934
S 287 over Weber Irrigation Canal	Poor condition + traffic exposure	Poor	2,300	1950
Jack Creek RD over Jack Creek 028	Poor condition + traffic exposure	Poor	301	1952
No Data Entered over W Fk Madison River	Poor condition + traffic exposure	Poor	50	1947
Ruby RD over Cottonwood CR	Poor condition + traffic exposure	Poor	50	1954
Mt 41 over Beaverhead River	Scour-critical foundation rating	Fair	2,865	1949
S 359 over Bricker Sparrow Ditch	Scour-critical foundation rating	Fair	1,429	1958
Kountz RD over Jefferson River 017	Scour-critical foundation rating	Fair	269	1973

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.