Knox County Bridge Report Card

Knox County scores 69 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.

D69 / 100

Local infrastructure snapshot

Knox County, Illinois

Knox County has 304 bridges in the National Bridge Inventory, with 32 rated poor and 0 rated scour-critical. Its poor-condition share of 10.5% is above the 9.5% statewide average. Poor-condition bridges carry about 53,835 daily vehicle crossings.

304Total Bridges

32Poor (10.5%)

123Fair (40.5%)

0Scour-Critical

Quote-Ready Local Facts

10.5%of county bridges are in poor condition, compared with 9.5% statewide and 6.7% nationally.

53,835daily vehicle crossings are on poor-condition bridges in the county.

0bridges are rated scour-critical, or 0.0% of the county bridge inventory.

Copyable Facts for Reporters

BridgeLookup.com gives Knox County a Bridge Condition Exposure Score of 69/100 (D). The county has 304 bridges in the National Bridge Inventory, including 32 in poor condition and 0 rated scour-critical. Poor-condition bridges carry about 53,835 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	10.5%	21.1
Poor-condition traffic exposure	25	13.1% of measured traffic	9.8
Scour-critical bridge share	20	0.0%	0.0
Average age vs national baseline	10	43 years vs 48 nationally	0.0
Traffic-data completeness	5	412,030 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	10.5%
State Poor-Condition Share	9.5%
National Poor-Condition Share	6.7%
County Scour-Critical Share	0.0%
Average Bridge Age	43 years
Poor-Condition Traffic Exposure	53,835 vehicles/day

Bridges to Watch

Busiest Poor-Condition BridgeWB I-74 over Spoon R & Tr 238a — 7,700 vehicles/day Oldest Listed BridgeHenderson ST over Cedar CR DR Dit — built in 1900 All County BridgesBrowse every bridge record in Knox County.

Top Bridges to Watch in Knox County

Bridge	Reason	Condition	Daily Traffic	Year Built
WB I-74 over Spoon R & Tr 238a	Poor condition + traffic exposure	Poor	7,700	1968
EB I-74 over Spoon River & Tr238a	Poor condition + traffic exposure	Poor	7,700	1968
Seminary ST over US 34 Bypass	Poor condition + traffic exposure	Poor	7,600	1972
EB I-74 over Il 17 & Bnsf-exempt	Poor condition + traffic exposure	Poor	7,500	1967
WB I-74 over Il 17 & Bnsf-exempt	Poor condition + traffic exposure	Poor	7,500	1967
Fau 6838-ch 10 over Bnsf Rr & Gravel RD	Poor condition + traffic exposure	Poor	3,050	1985
US 34 over Walnut Creek	Poor condition + traffic exposure	Poor	2,550	1921
US 150 over Pope CR	Poor condition + traffic exposure	Poor	2,350	1951
Ill 41 over Bnsf Rr (063729d)	Poor condition + traffic exposure	Poor	2,300	1983
US 150 over Spoon River	Poor condition + traffic exposure	Poor	1,100	1930

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.