LaSalle County Bridge Report Card

LaSalle County scores 65 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.

D65 / 100

Local infrastructure snapshot

LaSalle County, Illinois

LaSalle County has 528 bridges in the National Bridge Inventory, with 75 rated poor and 2 rated scour-critical. Its poor-condition share of 14.2% is above the 9.5% statewide average. Poor-condition bridges carry about 82,555 daily vehicle crossings.

528Total Bridges

75Poor (14.2%)

255Fair (48.3%)

2Scour-Critical

Quote-Ready Local Facts

14.2%of county bridges are in poor condition, compared with 9.5% statewide and 6.7% nationally.

82,555daily vehicle crossings are on poor-condition bridges in the county.

2bridges are rated scour-critical, or 0.4% of the county bridge inventory.

Copyable Facts for Reporters

BridgeLookup.com gives LaSalle County a Bridge Condition Exposure Score of 65/100 (D). The county has 528 bridges in the National Bridge Inventory, including 75 in poor condition and 2 rated scour-critical. Poor-condition bridges carry about 82,555 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	14.2%	28.4
Poor-condition traffic exposure	25	7.6% of measured traffic	5.7
Scour-critical bridge share	20	0.4%	0.8
Average age vs national baseline	10	47 years vs 48 nationally	0.0
Traffic-data completeness	5	1,091,760 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	14.2%
State Poor-Condition Share	9.5%
National Poor-Condition Share	6.7%
County Scour-Critical Share	0.4%
Average Bridge Age	47 years
Poor-Condition Traffic Exposure	82,555 vehicles/day

Bridges to Watch

Busiest Poor-Condition BridgeUS 6 Fap 623 over Fox River — 10,700 vehicles/day Oldest Listed BridgeEbl Of Ill 18 over Vermilion River — built in 1900 All County BridgesBrowse every bridge record in LaSalle County.

Top Bridges to Watch in LaSalle County

Bridge	Reason	Condition	Daily Traffic	Year Built
Co RD 57 over Vermilion River	Poor condition + traffic exposure	Poor	200	1969
Fau 6166 over Eagle Creek	Poor condition + traffic exposure	Poor	75	1960
US 6 Fap 623 over Fox River	Poor condition + traffic exposure	Poor	10,700	1928
I-39 Sb/us 51sb over C & NW Rr	Poor condition + traffic exposure	Poor	9,350	1977
Ill 251 (sb) over I 80	Poor condition + traffic exposure	Poor	6,550	1961
Ill 170 over Ill Mich Canal	Poor condition + traffic exposure	Poor	5,550	1940
Ill 23 Fap 68 over Covel Creek	Poor condition + traffic exposure	Poor	5,550	1953
Ill 23 Fap 68 over Covel Creek	Poor condition + traffic exposure	Poor	5,550	1960
Co RD 15 over Walbridge Creek	Poor condition + traffic exposure	Poor	4,700	1971
US 34 /fap 68 over Little Indian Creek	Poor condition + traffic exposure	Poor	4,100	1952

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.