Marion County Bridge Report Card

Marion County scores 83 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.

B83 / 100

Local infrastructure snapshot

Marion County, Indiana

Marion County has 969 bridges in the National Bridge Inventory, with 46 rated poor and 26 rated scour-critical. Its poor-condition share of 4.7% is at or below the 5.3% statewide average. Poor-condition bridges carry about 661,091 daily vehicle crossings.

969Total Bridges

46Poor (4.7%)

475Fair (49.0%)

26Scour-Critical

Quote-Ready Local Facts

4.7%of county bridges are in poor condition, compared with 5.3% statewide and 6.7% nationally.

661,091daily vehicle crossings are on poor-condition bridges in the county.

26bridges are rated scour-critical, or 2.7% of the county bridge inventory.

Copyable Facts for Reporters

BridgeLookup.com gives Marion County a Bridge Condition Exposure Score of 83/100 (B). The county has 969 bridges in the National Bridge Inventory, including 46 in poor condition and 26 rated scour-critical. Poor-condition bridges carry about 661,091 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	4.7%	9.5
Poor-condition traffic exposure	25	2.5% of measured traffic	1.9
Scour-critical bridge share	20	2.7%	5.4
Average age vs national baseline	10	48 years vs 48 nationally	0.0
Traffic-data completeness	5	26,684,203 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	4.7%
State Poor-Condition Share	5.3%
National Poor-Condition Share	6.7%
County Scour-Critical Share	2.7%
Average Bridge Age	48 years
Poor-Condition Traffic Exposure	661,091 vehicles/day

Bridges to Watch

Busiest Poor-Condition BridgeI-465 over Delaware Creek — 129,314 vehicles/day Oldest Listed BridgeIllinois Street over Fall Creek — built in 1899 All County BridgesBrowse every bridge record in Marion County.

Top Bridges to Watch in Marion County

Bridge	Reason	Condition	Daily Traffic	Year Built
10th Street over Big Eagle Creek	Poor condition + traffic exposure	Poor	38,589	1970
Southport RD over White River	Poor condition + traffic exposure	Poor	11,120	1950
Moore RD over Sheets Creek	Poor condition + traffic exposure	Poor	4,697	1935
Derbyshire Road over Derbyshire Creek	Poor condition + traffic exposure	Poor	1,716	1935
Audubon RD over Devon Creek	Poor condition + traffic exposure	Poor	897	1962
I-465 over Delaware Creek	Poor condition + traffic exposure	Poor	129,314	1966
I-465 over Crooked Creek	Poor condition + traffic exposure	Poor	129,314	1966
30th Street over White River	Poor condition + traffic exposure	Poor	35,555	1907
10th Street over Little Eagle Creek	Poor condition + traffic exposure	Poor	28,240	1988
16th Strmlk Jr over Indpls Water Co Canal	Poor condition + traffic exposure	Poor	25,206	1935

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.