Marion County Bridge Report Card
Marion County scores 70 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.
Marion County, Tennessee
Marion County has 177 bridges in the National Bridge Inventory, with 6 rated poor and 13 rated scour-critical. Its poor-condition share of 3.4% is at or below the 4.4% statewide average. Poor-condition bridges carry about 117,609 daily vehicle crossings.
Quote-Ready Local Facts
Copyable Facts for Reporters
BridgeLookup.com gives Marion County a Bridge Condition Exposure Score of 70/100 (C). The county has 177 bridges in the National Bridge Inventory, including 6 in poor condition and 13 rated scour-critical. Poor-condition bridges carry about 117,609 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 | 3.4% | 6.8 |
| Poor-condition traffic exposure | 25 | 7.1% of measured traffic | 5.3 |
| Scour-critical bridge share | 20 | 7.3% | 14.7 |
| Average age vs national baseline | 10 | 55 years vs 48 nationally | 2.8 |
| Traffic-data completeness | 5 | 1,652,221 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 | 3.4% |
| State Poor-Condition Share | 4.4% |
| National Poor-Condition Share | 6.7% |
| County Scour-Critical Share | 7.3% |
| Average Bridge Age | 55 years |
| Poor-Condition Traffic Exposure | 117,609 vehicles/day |
Bridges to Watch
Top Bridges to Watch in Marion County
| Bridge | Reason | Condition | Daily Traffic | Year Built |
|---|---|---|---|---|
| I24 over Sequatchie River | Poor condition + traffic exposure | Poor | 52,102 | 1965 |
| I24 over Sequatchie River | Poor condition + traffic exposure | Poor | 52,102 | 1965 |
| Fap 15 over Sr-15 / I-24 | Poor condition + traffic exposure | Poor | 5,811 | 1959 |
| Fap 15 over Sr-15 / I-24 | Poor condition + traffic exposure | Poor | 5,811 | 1959 |
| Nfa A444 over Poplar Springs Branch | Poor condition + traffic exposure | Poor | 1,690 | 1940 |
| Nfa 2153 (sa 5801) over Dry Creek | Poor condition + traffic exposure | Poor | 93 | 1979 |
| I24 over Big Fiery Gizzard Creek | Scour-critical foundation rating | Fair | 36,821 | 1963 |
| I24 over Big Fiery Gizzard Creek | Scour-critical foundation rating | Good | 36,821 | 1963 |
| Fas 283 over Sequatchie River | Scour-critical foundation rating | Fair | 4,237 | 1980 |
| Nfa 1106 (sa 5809) over Overflow | Scour-critical foundation rating | Good | 713 | 1979 |
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.