Sanders County Bridge Report Card

Sanders County scores 71 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.

C71 / 100

Local infrastructure snapshot

Sanders County, Montana

Sanders County has 120 bridges in the National Bridge Inventory, with 10 rated poor and 2 rated scour-critical. Its poor-condition share of 8.3% is above the 7.4% statewide average. Poor-condition bridges carry about 5,522 daily vehicle crossings.

120Total Bridges

10Poor (8.3%)

65Fair (54.2%)

2Scour-Critical

Quote-Ready Local Facts

8.3%of county bridges are in poor condition, compared with 7.4% statewide and 6.7% nationally.

5,522daily vehicle crossings are on poor-condition bridges in the county.

2bridges are rated scour-critical, or 1.7% of the county bridge inventory.

Copyable Facts for Reporters

BridgeLookup.com gives Sanders County a Bridge Condition Exposure Score of 71/100 (C). The county has 120 bridges in the National Bridge Inventory, including 10 in poor condition and 2 rated scour-critical. Poor-condition bridges carry about 5,522 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	8.3%	16.7
Poor-condition traffic exposure	25	11.7% of measured traffic	8.8
Scour-critical bridge share	20	1.7%	3.3
Average age vs national baseline	10	46 years vs 48 nationally	0.0
Traffic-data completeness	5	47,005 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	8.3%
State Poor-Condition Share	7.4%
National Poor-Condition Share	6.7%
County Scour-Critical Share	1.7%
Average Bridge Age	46 years
Poor-Condition Traffic Exposure	5,522 vehicles/day

Bridges to Watch

Busiest Poor-Condition BridgeS 200 over Clark Fork River — 2,482 vehicles/day Oldest Listed BridgeVermilion Riv RD over Lyons Creek 032 — built in 1900 All County BridgesBrowse every bridge record in Sanders County.

Top Bridges to Watch in Sanders County

Bridge	Reason	Condition	Daily Traffic	Year Built
S 200 over Clark Fork River	Poor condition + traffic exposure	Poor	2,482	1960
S 200 over Rr	Poor condition + traffic exposure	Poor	1,537	1957
S 56 Fh 5 over Bull River	Poor condition + traffic exposure	Poor	692	1960
IRR - S 382 over Rr	Poor condition + traffic exposure	Poor	391	1965
Noxon AVE E over Cabinet Gorge Resv 047	Poor condition + traffic exposure	Poor	100	1922
Michel Creek RD over Camas Creek 002	Poor condition + traffic exposure	Poor	100	1978
Lil Bitterroot RD over Little Bitterroot Rv 070	Poor condition + traffic exposure	Poor	100	1978
No Data Entered over Rock CR	Poor condition + traffic exposure	Poor	50	1954
No Data Entered over Vermilion River	Poor condition + traffic exposure	Poor	50	1959
IRR BIA RTE 123 over South Fork Valley Creek	Poor condition + traffic exposure	Poor	20	1995

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.