Williamson County Bridge Report Card
Williamson County scores 87 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.
Williamson County, Tennessee
Williamson County has 531 bridges in the National Bridge Inventory, with 16 rated poor and 2 rated scour-critical. Its poor-condition share of 3.0% is at or below the 4.4% statewide average. Poor-condition bridges carry about 453,422 daily vehicle crossings.
Quote-Ready Local Facts
Copyable Facts for Reporters
BridgeLookup.com gives Williamson County a Bridge Condition Exposure Score of 87/100 (B). The county has 531 bridges in the National Bridge Inventory, including 16 in poor condition and 2 rated scour-critical. Poor-condition bridges carry about 453,422 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 | 3.0% | 6.0 |
| Poor-condition traffic exposure | 25 | 7.7% of measured traffic | 5.8 |
| Scour-critical bridge share | 20 | 0.4% | 0.8 |
| Average age vs national baseline | 10 | 41 years vs 48 nationally | 0.0 |
| Traffic-data completeness | 5 | 5,873,035 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 | 3.0% |
| State Poor-Condition Share | 4.4% |
| National Poor-Condition Share | 6.7% |
| County Scour-Critical Share | 0.4% |
| Average Bridge Age | 41 years |
| Poor-Condition Traffic Exposure | 453,422 vehicles/day |
Bridges to Watch
Top Bridges to Watch in Williamson County
| Bridge | Reason | Condition | Daily Traffic | Year Built |
|---|---|---|---|---|
| Nfa 990 (sa 9425) over Harpeth River | Poor condition + traffic exposure | Poor | 11,007 | 1962 |
| I65 over Branch | Poor condition + traffic exposure | Poor | 109,713 | 1963 |
| I65 over I65 / Sr106 & Harpeth Rv | Poor condition + traffic exposure | Poor | 94,031 | 1963 |
| I65 over I65 / Sr106 & Harpeth Rv | Poor condition + traffic exposure | Poor | 94,031 | 1963 |
| Fap 96 over SR 96 / I65 | Poor condition + traffic exposure | Poor | 31,982 | 1962 |
| Fap 96 over Harpeth River | Poor condition + traffic exposure | Poor | 19,656 | 1958 |
| Fau 441 Ramp C over Ramp C/ramp B Cool Spng | Poor condition + traffic exposure | Poor | 17,725 | 1991 |
| Fap 6 over Harpeth River | Poor condition + traffic exposure | Poor | 16,173 | 1929 |
| Fap 6 350615g over Csx Railroad | Poor condition + traffic exposure | Poor | 14,336 | 1930 |
| Fap 11 over Mill Creek | Poor condition + traffic exposure | Poor | 13,218 | 1930 |
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.