Johnson County Bridge Report Card
Johnson County scores 80 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.
Johnson County, Missouri
Johnson County has 475 bridges in the National Bridge Inventory, with 33 rated poor and 5 rated scour-critical. Its poor-condition share of 6.9% is at or below the 8.8% statewide average. Poor-condition bridges carry about 18,774 daily vehicle crossings.
Quote-Ready Local Facts
Copyable Facts for Reporters
BridgeLookup.com gives Johnson County a Bridge Condition Exposure Score of 80/100 (B). The county has 475 bridges in the National Bridge Inventory, including 33 in poor condition and 5 rated scour-critical. Poor-condition bridges carry about 18,774 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 | 6.9% | 13.9 |
| Poor-condition traffic exposure | 25 | 4.3% of measured traffic | 3.2 |
| Scour-critical bridge share | 20 | 1.1% | 2.1 |
| Average age vs national baseline | 10 | 51 years vs 48 nationally | 1.2 |
| Traffic-data completeness | 5 | 434,495 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 | 6.9% |
| State Poor-Condition Share | 8.8% |
| National Poor-Condition Share | 6.7% |
| County Scour-Critical Share | 1.1% |
| Average Bridge Age | 51 years |
| Poor-Condition Traffic Exposure | 18,774 vehicles/day |
Bridges to Watch
Top Bridges to Watch in Johnson County
| Bridge | Reason | Condition | Daily Traffic | Year Built |
|---|---|---|---|---|
| RT M S over Snail CR | Poor condition + traffic exposure | Poor | 552 | 1947 |
| Co RD SW 801 over Trib Of Big CR | Poor condition + traffic exposure | Poor | 110 | 1989 |
| Co RD NW 575 over Walnut CR | Poor condition + traffic exposure | Poor | 45 | 1900 |
| Co RD NE 671 over Mulkey CR | Poor condition + traffic exposure | Poor | 40 | 1900 |
| Co RD SW 301 over E Fk Post Oak CR | Poor condition + traffic exposure | Poor | 40 | 1900 |
| US 50 E over Up Rr | Poor condition + traffic exposure | Poor | 8,279 | 1968 |
| US 50 W over Up Rr | Poor condition + traffic exposure | Poor | 6,420 | 1956 |
| Washington AVE over Br Of Long Br CR | Poor condition + traffic exposure | Poor | 1,000 | 1998 |
| RT V E over Colburn CR | Poor condition + traffic exposure | Poor | 551 | 1951 |
| RT Tt E over Hornsby Br | Poor condition + traffic exposure | Poor | 345 | 1955 |
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.