Carter County Bridge Report Card

Carter County scores 82 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.

B82 / 100

Local infrastructure snapshot

Carter County, Montana

Carter County has 42 bridges in the National Bridge Inventory, with 2 rated poor and 1 rated scour-critical. Its poor-condition share of 4.8% is at or below the 7.4% statewide average. Poor-condition bridges carry about 865 daily vehicle crossings.

42Total Bridges

2Poor (4.8%)

27Fair (64.3%)

1Scour-Critical

Quote-Ready Local Facts

4.8%of county bridges are in poor condition, compared with 7.4% statewide and 6.7% nationally.

865daily vehicle crossings are on poor-condition bridges in the county.

1bridges are rated scour-critical, or 2.4% of the county bridge inventory.

Copyable Facts for Reporters

BridgeLookup.com gives Carter County a Bridge Condition Exposure Score of 82/100 (B). The county has 42 bridges in the National Bridge Inventory, including 2 in poor condition and 1 rated scour-critical. Poor-condition bridges carry about 865 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	4.8%	9.5
Poor-condition traffic exposure	25	5.2% of measured traffic	3.9
Scour-critical bridge share	20	2.4%	4.8
Average age vs national baseline	10	41 years vs 48 nationally	0.0
Traffic-data completeness	5	16,690 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	4.8%
State Poor-Condition Share	7.4%
National Poor-Condition Share	6.7%
County Scour-Critical Share	2.4%
Average Bridge Age	41 years
Poor-Condition Traffic Exposure	865 vehicles/day

Bridges to Watch

Busiest Poor-Condition BridgeS 7 over Drainage — 473 vehicles/day Oldest Listed BridgeStagville Draw RD over Russell Creek 005 — built in 1938 All County BridgesBrowse every bridge record in Carter County.

Top Bridges to Watch in Carter County

Bridge	Reason	Condition	Daily Traffic	Year Built
S 7 over Drainage	Poor condition + traffic exposure	Poor	473	1940
S 7 over Collins Creek	Poor condition + traffic exposure	Poor	392	1940
Larson Loop RD over Box Elder Creek	Scour-critical foundation rating	Good	100	2019
US 212 over Drainage	High traffic	Fair	2,642	1965
US 212 over Thompson Creek	High traffic	Fair	2,642	1965
US 212 over Little Missouri River	High traffic	Fair	2,642	1965
US 212 over Willow Creek	High traffic	Fair	2,285	1955
Mormon AVE over Russell Creek 035	High traffic	Fair	480	1940
Chicago AVE over Russell Creek	High traffic	Good	480	2019
S 7 over Flasted Draw	High traffic	Fair	392	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.