Johnson County Bridge Report Card

Johnson County scores 95 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.

A95 / 100

Local infrastructure snapshot

Johnson County, Illinois

Johnson County has 118 bridges in the National Bridge Inventory, with 3 rated poor and 0 rated scour-critical. Its poor-condition share of 2.5% is at or below the 9.5% statewide average. Poor-condition bridges carry about 454 daily vehicle crossings.

118Total Bridges

3Poor (2.5%)

50Fair (42.4%)

0Scour-Critical

Quote-Ready Local Facts

2.5%of county bridges are in poor condition, compared with 9.5% statewide and 6.7% nationally.

454daily 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 Johnson County a Bridge Condition Exposure Score of 95/100 (A). The county has 118 bridges in the National Bridge Inventory, including 3 in poor condition and 0 rated scour-critical. Poor-condition bridges carry about 454 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	2.5%	5.1
Poor-condition traffic exposure	25	0.2% of measured traffic	0.1
Scour-critical bridge share	20	0.0%	0.0
Average age vs national baseline	10	47 years vs 48 nationally	0.0
Traffic-data completeness	5	274,804 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	2.5%
State Poor-Condition Share	9.5%
National Poor-Condition Share	6.7%
County Scour-Critical Share	0.0%
Average Bridge Age	47 years
Poor-Condition Traffic Exposure	454 vehicles/day

Bridges to Watch

Busiest Poor-Condition BridgeTr 111 over Dutchman Cr. Trib. — 225 vehicles/day Oldest Listed BridgeSide Street over Union Pacific Rr — built in 1900 All County BridgesBrowse every bridge record in Johnson County.

Top Bridges to Watch in Johnson County

Bridge	Reason	Condition	Daily Traffic	Year Built
Tr 111 over Dutchman Cr. Trib.	Poor condition + traffic exposure	Poor	225	1978
Sbi 146 over Dutchman Creek	Poor condition + traffic exposure	Poor	200	1930
Fr 870 over Wagon Creek	Poor condition + traffic exposure	Poor	29	1967
I 24 over Dry Fork Creek	High traffic	Fair	20,700	1976
I 24 over Mccorkle Creek	High traffic	Good	20,500	1971
I 24 EB over Tr 42 & L Saline R	High traffic	Fair	10,350	1972
I 24 WB over Tr 42 & L Saline R	High traffic	Fair	10,350	1972
I 24 EB over Tr 77 Bowman Bottoms	High traffic	Fair	10,300	1971
I 24 WB over Tr 77 Bowman Bottoms	High traffic	Fair	10,300	1971
I 24 WB over US 45	High traffic	Fair	10,300	1971

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.