Carroll County Bridge Report Card
Carroll County scores 76 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.
Carroll County, New Hampshire
Carroll County has 193 bridges in the National Bridge Inventory, with 10 rated poor and 8 rated scour-critical. Its poor-condition share of 5.2% is at or below the 7.5% statewide average. Poor-condition bridges carry about 2,051 daily vehicle crossings.
Quote-Ready Local Facts
Copyable Facts for Reporters
BridgeLookup.com gives Carroll County a Bridge Condition Exposure Score of 76/100 (C). The county has 193 bridges in the National Bridge Inventory, including 10 in poor condition and 8 rated scour-critical. Poor-condition bridges carry about 2,051 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 | 5.2% | 10.4 |
| Poor-condition traffic exposure | 25 | 0.5% of measured traffic | 0.3 |
| Scour-critical bridge share | 20 | 4.1% | 8.3 |
| Average age vs national baseline | 10 | 60 years vs 48 nationally | 4.9 |
| Traffic-data completeness | 5 | 450,099 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 | 5.2% |
| State Poor-Condition Share | 7.5% |
| National Poor-Condition Share | 6.7% |
| County Scour-Critical Share | 4.1% |
| Average Bridge Age | 60 years |
| Poor-Condition Traffic Exposure | 2,051 vehicles/day |
Bridges to Watch
Top Bridges to Watch in Carroll County
| Bridge | Reason | Condition | Daily Traffic | Year Built |
|---|---|---|---|---|
| Granite Road over South River | Poor condition + traffic exposure | Poor | 96 | 1920 |
| Maple Street over Branch River | Poor condition + traffic exposure | Poor | 96 | 1940 |
| Nh 16a over E Br Saco River | Poor condition + traffic exposure | Poor | 1,078 | 1928 |
| Maple Street over Cold Brook | Poor condition + traffic exposure | Poor | 253 | 1922 |
| Durgin Bridge Road over Cold River | Poor condition + traffic exposure | Poor | 164 | 1869 |
| Drake Hill Road over Meadow Brook | Poor condition + traffic exposure | Poor | 108 | 1930 |
| Fdr 17 over Burnt Knoll | Poor condition + traffic exposure | Poor | 100 | 1975 |
| Upper Road over Bearcamp River | Poor condition + traffic exposure | Poor | 96 | 1950 |
| Fdr 35 over Douglas Brook | Poor condition + traffic exposure | Poor | 50 | 1950 |
| No Data Entered over No Data Entered | Poor condition + traffic exposure | Poor | 10 | 1990 |
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.