Custer County Bridge Report Card

Custer County scores 76 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.

C76 / 100

Local infrastructure snapshot

Custer County, Montana

Custer County has 71 bridges in the National Bridge Inventory, with 6 rated poor and 1 rated scour-critical. Its poor-condition share of 8.5% is above the 7.4% statewide average. Poor-condition bridges carry about 1,821 daily vehicle crossings.

71Total Bridges

6Poor (8.5%)

54Fair (76.1%)

1Scour-Critical

Quote-Ready Local Facts

8.5%of county bridges are in poor condition, compared with 7.4% statewide and 6.7% nationally.

1,821daily vehicle crossings are on poor-condition bridges in the county.

1bridges are rated scour-critical, or 1.4% of the county bridge inventory.

Copyable Facts for Reporters

BridgeLookup.com gives Custer County a Bridge Condition Exposure Score of 76/100 (C). The county has 71 bridges in the National Bridge Inventory, including 6 in poor condition and 1 rated scour-critical. Poor-condition bridges carry about 1,821 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	8.5%	16.9
Poor-condition traffic exposure	25	2.3% of measured traffic	1.7
Scour-critical bridge share	20	1.4%	2.8
Average age vs national baseline	10	55 years vs 48 nationally	2.7
Traffic-data completeness	5	79,024 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	8.5%
State Poor-Condition Share	7.4%
National Poor-Condition Share	6.7%
County Scour-Critical Share	1.4%
Average Bridge Age	55 years
Poor-Condition Traffic Exposure	1,821 vehicles/day

Bridges to Watch

Busiest Poor-Condition BridgeFrntage Road 81020 over Cottonwood Creek 083 — 507 vehicles/day Oldest Listed BridgeN Locate RD over Locate Creek 045 — built in 1901 All County BridgesBrowse every bridge record in Custer County.

Top Bridges to Watch in Custer County

Bridge	Reason	Condition	Daily Traffic	Year Built
Frntage Road 81020 over Cottonwood Creek 083	Poor condition + traffic exposure	Poor	507	1928
Frntage Road 81020 over Miles Creek 037	Poor condition + traffic exposure	Poor	507	1929
Frntage Road 81020 over Macks Creek 038	Poor condition + traffic exposure	Poor	507	1929
Frontage Road 205 over Snell Creek 073	Poor condition + traffic exposure	Poor	100	1928
Frontage Road 205 over Cottonwood Creek 072	Poor condition + traffic exposure	Poor	100	1929
Kircher Creek RD over T And Y Canal 032	Poor condition + traffic exposure	Poor	100	1938
Tusler RD over Yellowstone River 094	Scour-critical foundation rating	Fair	78	1907
I 94 over Coal Creek	High traffic	Fair	4,724	1963
I 94 over Lignite Creek	High traffic	Fair	4,724	1964
I 94 over Tongue River	High traffic	Fair	4,707	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.