Bridge conditions in Hillsborough County, New Hampshire
385 inventoried bridges · 31 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
Hillsborough County tracks close to typical: 31 of its 385 inventoried bridges (8.1%) are rated poor, against a national rate of about 7%.
- 31 of the 385 bridges in Hillsborough County, New Hampshire, are rated in poor condition (8.1%) in the 2025 National Bridge Inventory, as of .
- 201 bridges (52.2%) are rated good and 153 (39.7%) fair.
- The median Hillsborough County bridge was built in 1973.
- The busiest poor-rated bridge is I-293 Fee Tpk over Stark Way (built 1956), carrying about 46,106 vehicles a day.
Good 52.2% · Fair 39.7% · Poor 8.1% of 385 bridges
Bridges rated poor
Every bridge in the county with a poor rating, busiest first. Poor means a major component is rated 4 or lower on FHWA's 0-9 scale; it is a repair flag, not a closure notice.
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I-293 Fee Tpk over Stark Way | 1956 | 46,106 | Poor |
| Fee Tpk SB over Pennichuck Brook | 1954 | 44,365 | Poor |
| I-293 Nh 3A Tpk N over Black Brook | 1956 | 24,101 | Poor |
| I-293 Nh 3A Tpk S over Black Brook | 1956 | 22,005 | Poor |
| Salmon Street EB over Merrimack R CSX Rd Ramp | 1970 | 13,150 | Poor |
| US 3 over Baboosic Brook | 1933 | 13,024 | Poor |
| Nh 13 over Souhegan River | 1931 | 12,799 | Poor |
| Baboosic Lake Road over Fee Tpk | 1954 | 6,359 | Poor |
| Main Street over Beaver Brook | 1900 | 6,111 | Poor |
| US202 NH123 over Contoocook River | 1942 | 5,773 | Poor |
| Nh 31 over Stony Brook | 1929 | 3,496 | Poor |
| Antrim Road over Monadnock Mill Canal | 1922 | 2,233 | Poor |
| Wilton Road over Souhegan River | 1938 | 1,866 | Poor |
| River Road over Piscataquog River | 1940 | 1,866 | Poor |
| Tirrell Hill Road over Black Brook | 1994 | 1,387 | Poor |
| Temple Road over Blood Brook | 1901 | 1,167 | Poor |
| Contoocook Falls R over Contoocook River | 1933 | 712 | Poor |
| Beaver Brook Road over Beaver Brook | 1932 | 629 | Poor |
| Greenfield Parkway over Riddle Brook | 2000 | 571 | Poor |
| Dupaw Gould Road over Lancy Brook | 1987 | 559 | Poor |
| Beals Road over Baboosic Brook | 1928 | 511 | Poor |
| Thorntons Ferry Rd over Beaver Brook | 1970 | 356 | Poor |
| Windy Row Road over Mcdowell Reservoir | 1950 | 247 | Poor |
| Liberty Farm Road over North Branch River | 1991 | 96 | Poor |
| Old County Rd N over Collins Brook | 1981 | 96 | Poor |
| Cressy Hill Road over Rand Brook | 1940 | 96 | Poor |
| Gleason Falls Road over Beards Brook | 1900 | 96 | Poor |
| Jones Road over Beards Brook | 1900 | 96 | Poor |
| Putnam Road over Brook | 1930 | 96 | Poor |
| Frye Mill Road over Burton Pond Outlet | 1920 | 36 | Poor |
| On-orbit Drive over Gardner-joe English Stre | 1959 | 10 | Poor |
Busiest bridges in the county
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Fee Tpk N&S Ramps over Salmon Brook | 1955 | 128,889 | Good |
| Fee Tpk over Greeley Street | 1993 | 78,063 | Good |
| Fee Tpk over Souhegan River | 1953 | 75,081 | Good |
| Fee Tpk over Baboosic Brook | 1954 | 75,081 | Good |
| US 3 Fee Tpk NB over Nashua River | 1955 | 73,979 | Fair |
| US 3 Fee Tpk SB over Nashua River | 1959 | 71,221 | Good |
| I-293 Fee Tpk over N Br Piscataquog River | 2016 | 69,164 | Good |
| Fee Tpk NB Ramp 4 over Ramp 3B | 1997 | 66,228 | Good |
| I-293 Fee Tpk over S Br Piscataquog River | 2016 | 63,919 | Good |
| I-293 Fee Tpk over I-293 NB on Ramp | 2016 | 63,919 | Good |
Source: FHWA National Bridge Inventory, 2025. Counts cover inventoried highway bridges over 20 feet; ratings are reported by the state DOT.
All of New Hampshire: New Hampshire bridge conditions by county · every download on the data page.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.