Sullivan County Bridge Report Card
Sullivan County scores 75 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.
Sullivan County, New Hampshire
Sullivan County has 158 bridges in the National Bridge Inventory, with 9 rated poor and 5 rated scour-critical. Its poor-condition share of 5.7% is at or below the 7.5% statewide average. Poor-condition bridges carry about 6,673 daily vehicle crossings.
Quote-Ready Local Facts
Copyable Facts for Reporters
BridgeLookup.com gives Sullivan County a Bridge Condition Exposure Score of 75/100 (C). The county has 158 bridges in the National Bridge Inventory, including 9 in poor condition and 5 rated scour-critical. Poor-condition bridges carry about 6,673 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 | 5.7% | 11.4 |
| Poor-condition traffic exposure | 25 | 1.5% of measured traffic | 1.1 |
| Scour-critical bridge share | 20 | 3.2% | 6.3 |
| Average age vs national baseline | 10 | 62 years vs 48 nationally | 5.9 |
| Traffic-data completeness | 5 | 440,468 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 | 5.7% |
| State Poor-Condition Share | 7.5% |
| National Poor-Condition Share | 6.7% |
| County Scour-Critical Share | 3.2% |
| Average Bridge Age | 62 years |
| Poor-Condition Traffic Exposure | 6,673 vehicles/day |
Bridges to Watch
Top Bridges to Watch in Sullivan County
| Bridge | Reason | Condition | Daily Traffic | Year Built |
|---|---|---|---|---|
| Nh 12a over Sugar River | Poor condition + traffic exposure | Poor | 1,067 | 1967 |
| Grout Hill Road over Cold River | Poor condition + traffic exposure | Poor | 96 | 1930 |
| Cornish Toll Br RD over Connecticut River | Poor condition + traffic exposure | Poor | 2,722 | 1866 |
| Plains Road over Sugar River | Poor condition + traffic exposure | Poor | 1,376 | 1974 |
| Stage Road over Blow-me-down Brook | Poor condition + traffic exposure | Poor | 574 | 1954 |
| Bridge Street over Necrr | Poor condition + traffic exposure | Poor | 534 | 1992 |
| Leavitt Hill Road over Blow-me-down-brook | Poor condition + traffic exposure | Poor | 112 | 1950 |
| Paradise Road over Sugar River | Poor condition + traffic exposure | Poor | 96 | 1976 |
| Stage Road over Little Sugar River | Poor condition + traffic exposure | Poor | 96 | 1980 |
| Citizens Street over Sugar River | Scour-critical foundation rating | Fair | 1,345 | 1959 |
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.