St. Charles County Bridge Report Card

St. Charles County scores 93 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.

A93 / 100

Local infrastructure snapshot

St. Charles County, Missouri

St. Charles County has 419 bridges in the National Bridge Inventory, with 12 rated poor and 2 rated scour-critical. Its poor-condition share of 2.9% is at or below the 8.8% statewide average. Poor-condition bridges carry about 56,563 daily vehicle crossings.

419Total Bridges

12Poor (2.9%)

269Fair (64.2%)

2Scour-Critical

Quote-Ready Local Facts

2.9%of county bridges are in poor condition, compared with 8.8% statewide and 6.7% nationally.

56,563daily vehicle crossings are on poor-condition bridges in the county.

2bridges are rated scour-critical, or 0.5% of the county bridge inventory.

Copyable Facts for Reporters

BridgeLookup.com gives St. Charles County a Bridge Condition Exposure Score of 93/100 (A). The county has 419 bridges in the National Bridge Inventory, including 12 in poor condition and 2 rated scour-critical. Poor-condition bridges carry about 56,563 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	2.9%	5.7
Poor-condition traffic exposure	25	1.0% of measured traffic	0.8
Scour-critical bridge share	20	0.5%	1.0
Average age vs national baseline	10	31 years vs 48 nationally	0.0
Traffic-data completeness	5	5,475,551 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	2.9%
State Poor-Condition Share	8.8%
National Poor-Condition Share	6.7%
County Scour-Critical Share	0.5%
Average Bridge Age	31 years
Poor-Condition Traffic Exposure	56,563 vehicles/day

Bridges to Watch

Busiest Poor-Condition BridgeIs 64 W over Is 70 — 35,428 vehicles/day Oldest Listed BridgeWilmes RD over No CR — built in 1900 All County BridgesBrowse every bridge record in St. Charles County.

Top Bridges to Watch in St. Charles County

Bridge	Reason	Condition	Daily Traffic	Year Built
Is 64 W over Is 70	Poor condition + traffic exposure	Poor	35,428	1971
RT W S over Is 70	Poor condition + traffic exposure	Poor	10,399	1963
Or 64 E over Peruque CR	Poor condition + traffic exposure	Poor	2,603	1935
Dietrich RD over Trib Of Mccoy CR	Poor condition + traffic exposure	Poor	2,429	1987
ST Paul RD over Trib Of Peruque CR	Poor condition + traffic exposure	Poor	1,720	1940
Park RD C over Br Of Dardenne CR	Poor condition + traffic exposure	Poor	1,000	1942
Park RD B over Br Of Dardenne CR	Poor condition + traffic exposure	Poor	1,000	1942
Josephville RD over Trib Of Cuivre Rvr	Poor condition + traffic exposure	Poor	977	1950
Schwede RD over Trib Of Dardenne C	Poor condition + traffic exposure	Poor	472	1988
Oberhelman RD over Trib Of Dardenne C	Poor condition + traffic exposure	Poor	355	1986

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.