Marion County Bridge Report Card

Marion County scores 76 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.

C76 / 100

Local infrastructure snapshot

Marion County, Illinois

Marion County has 294 bridges in the National Bridge Inventory, with 22 rated poor and 1 rated scour-critical. Its poor-condition share of 7.5% is at or below the 9.5% statewide average. Poor-condition bridges carry about 45,560 daily vehicle crossings.

294Total Bridges

22Poor (7.5%)

90Fair (30.6%)

1Scour-Critical

Quote-Ready Local Facts

7.5%of county bridges are in poor condition, compared with 9.5% statewide and 6.7% nationally.

45,560daily vehicle crossings are on poor-condition bridges in the county.

1bridges are rated scour-critical, or 0.3% of the county bridge inventory.

Copyable Facts for Reporters

BridgeLookup.com gives Marion County a Bridge Condition Exposure Score of 76/100 (C). The county has 294 bridges in the National Bridge Inventory, including 22 in poor condition and 1 rated scour-critical. Poor-condition bridges carry about 45,560 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	7.5%	15.0
Poor-condition traffic exposure	25	9.2% of measured traffic	6.9
Scour-critical bridge share	20	0.3%	0.7
Average age vs national baseline	10	52 years vs 48 nationally	1.8
Traffic-data completeness	5	496,775 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	7.5%
State Poor-Condition Share	9.5%
National Poor-Condition Share	6.7%
County Scour-Critical Share	0.3%
Average Bridge Age	52 years
Poor-Condition Traffic Exposure	45,560 vehicles/day

Bridges to Watch

Busiest Poor-Condition BridgeFai-57 NB over Crooked Creek — 9,650 vehicles/day Oldest Listed BridgeTr-498a (sullens R over Conner Branch — built in 1900 All County BridgesBrowse every bridge record in Marion County.

Top Bridges to Watch in Marion County

Bridge	Reason	Condition	Daily Traffic	Year Built
Fai-57 NB over Crooked Creek	Poor condition + traffic exposure	Poor	9,650	1968
Fai-57 SB over Crooked Creek	Poor condition + traffic exposure	Poor	9,650	1968
I-57 SB over Csxrr	Poor condition + traffic exposure	Poor	9,650	1968
Fai-57 SB over Us-50	Poor condition + traffic exposure	Poor	8,350	1968
Il 161 - Fap 805 over Fai-57	Poor condition + traffic exposure	Poor	3,900	1968
Old US 51 (fas 179 over Crooked Creek	Poor condition + traffic exposure	Poor	1,450	1954
Fas-789 over Jamison Creek	Poor condition + traffic exposure	Poor	1,400	1954
Fas-2791 over Raccoon Creek	Poor condition + traffic exposure	Poor	375	1909
Tr-114 over Zion Hill Branch	Poor condition + traffic exposure	Poor	300	1909
Old US 51 (sbi 2a) over Lost Creek	Poor condition + traffic exposure	Poor	175	1920

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.