Johnson County Bridge Report Card
Johnson County scores 63 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.
Johnson County, Indiana
Johnson County has 230 bridges in the National Bridge Inventory, with 23 rated poor and 17 rated scour-critical. Its poor-condition share of 10.0% is above the 5.3% statewide average. Poor-condition bridges carry about 42,002 daily vehicle crossings.
Quote-Ready Local Facts
Copyable Facts for Reporters
BridgeLookup.com gives Johnson County a Bridge Condition Exposure Score of 63/100 (D). The county has 230 bridges in the National Bridge Inventory, including 23 in poor condition and 17 rated scour-critical. Poor-condition bridges carry about 42,002 daily vehicle crossings. Poor condition does not mean unsafe; bridges judged unsafe are closed or restricted by transportation agencies.
How the Score Breaks Down
| Factor | Weight | County Value | Penalty |
|---|---|---|---|
| Poor-condition bridge share | 40 | 10.0% | 20.0 |
| Poor-condition traffic exposure | 25 | 2.7% of measured traffic | 2.0 |
| Scour-critical bridge share | 20 | 7.4% | 14.8 |
| Average age vs national baseline | 10 | 42 years vs 48 nationally | 0.0 |
| Traffic-data completeness | 5 | 1,583,259 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 | 10.0% |
| State Poor-Condition Share | 5.3% |
| National Poor-Condition Share | 6.7% |
| County Scour-Critical Share | 7.4% |
| Average Bridge Age | 42 years |
| Poor-Condition Traffic Exposure | 42,002 vehicles/day |
Bridges to Watch
Top Bridges to Watch in Johnson County
| Bridge | Reason | Condition | Daily Traffic | Year Built |
|---|---|---|---|---|
| CR 400 South over Sugar Creek | Poor condition + traffic exposure | Poor | 712 | 1978 |
| Smith Valley Road over Conrail Railroad | Poor condition + traffic exposure | Poor | 16,930 | 1972 |
| CR 500 North over Grassy Creek | Poor condition + traffic exposure | Poor | 7,111 | 1985 |
| CR 700 North over Leatherwood Creek | Poor condition + traffic exposure | Poor | 3,191 | 1950 |
| CR 700 North over Campbell Ditch | Poor condition + traffic exposure | Poor | 3,191 | 1978 |
| CR 300 South over Vandiver Ditch | Poor condition + traffic exposure | Poor | 2,540 | 1978 |
| Leisure Lane over Pleasant Run Creek | Poor condition + traffic exposure | Poor | 2,061 | 1955 |
| CR 575 West over North Prong Stotts CR | Poor condition + traffic exposure | Poor | 900 | 1968 |
| CR 575 West over South Prong Stotts CR | Poor condition + traffic exposure | Poor | 900 | 1978 |
| CR 500 West over Indian Creek | Poor condition + traffic exposure | Poor | 900 | 1982 |
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.