New Hampshire bridges
New Hampshire reports 2,549 bridges and culverts across 10 counties. 192 (7.5%) are rated in poor condition, and 120 are posted with load limits or closed. The oldest structure still in the inventory dates from 1832.
Find a bridge in New Hampshire
Type at least two characters, or pick a condition or type, to search every bridge in the state.
Counties
Circle size reflects the number of bridges- Belknap County 112
- Carroll County 193
- Cheshire County 194
- Coos County 189
- Grafton County 547
- Hillsborough County 385
- Merrimack County 326
- Rockingham County 309
- Strafford County 136
- Sullivan County 158
Condition
Good51%(1,303)
Fair41%(1,054)
Poor8%(192)
Counties with the highest share of poor bridges
- Cheshire County11.3% of 194
- Strafford County9.6% of 136
- Merrimack County8.3% of 326
- Hillsborough County8.1% of 385
- Grafton County7.9% of 547
Structure types
| Structure type | Bridges | Share |
|---|---|---|
| Stringer/Multi-beam or Girder | 1,371 | 53.8% |
| Slab | 300 | 11.8% |
| Frame | 292 | 11.5% |
| Culvert | 288 | 11.3% |
| Tee Beam | 70 | 2.7% |
| Box Beam or Girders - Multiple | 65 | 2.6% |
| Arch - Deck | 52 | 2.0% |
| Truss - Thru | 50 | 2.0% |
| Girder and Floorbeam System | 30 | 1.2% |
| Other | 18 | 0.7% |
| Arch - Thru | 4 | 0.2% |
| Truss - Deck | 3 | 0.1% |
| Movable - Lift | 2 | 0.1% |
| Movable - Bascule | 2 | 0.1% |
| Box Beam or Girders - Single or Spread | 2 | 0.1% |
When New Hampshire's bridges were built
Busiest
- Fee Tpk N&s Ramps over Salmon BrookGoodHillsborough County · 128,889 vehicles/day
- I-95 over Access RoadFairRockingham County · 86,429 vehicles/day
- I-93 Fee Tpk Ramp over Hackett Hill RoadFairMerrimack County · 86,013 vehicles/day
- I-93 Fee Tpk over Cross RoadFairMerrimack County · 82,029 vehicles/day
- I-93 Fee Tpk over Ramp A-BFairMerrimack County · 79,640 vehicles/day
Longest
- US 1 Bypass over Piscataqua River RRGoodRockingham County · 2,784 ft
- NH119 over Connecticut River NecrrGoodCheshire County · 1,906 ft
- I-95 over Preble Way CSXFairRockingham County · 1,810 ft
- US 4 Nh 16 Tpk SB over Little Bay RDGoodStrafford County · 1,649 ft
- US 4 Nh 16 Tpk NB over Little Bay RDGoodStrafford County · 1,598 ft
Oldest
- Main Street over Ashuelot RiverFairCheshire County · Built 1832
- West Bath Road over Ammonoosuc R Nhrr(abd)FairGrafton County · Built 1832
- Coombs Bridge RD over Ashuelot RiverFairCheshire County · Built 1837
- New Market Road over Warner RiverFairMerrimack County · Built 1840
- Corbin Bridge Road over Croydon Branch Sugar RFairSullivan County · Built 1845
Newest
- US202 NH101 over Contoocook RiverGoodHillsborough County · Built 2024
- NH119 over Connecticut River NecrrGoodCheshire County · Built 2024
- NH135 over BrookGoodCoos County · Built 2024
- Streeter Pond Road over Indian CreekGoodGrafton County · Built 2024
- Martin Road over Piscassic RiverGoodRockingham County · Built 2024
Who owns New Hampshire's bridges
| State | 1,310 | 51.4% |
| City | 987 | 38.7% |
| Toll Authority | 168 | 6.6% |
| Federal | 81 | 3.2% |
| Local | 2 | 0.1% |
| County | 1 | 0.0% |
More New Hampshire facts
Total bridge length51 miles
Total deck area12,595,604 sq ft
Culverts counted as bridges288 (11%)
On the National Highway System730
Posted with load limits105
Closed to traffic15
Listed or eligible for the National Register111
Average daily traffic per bridge6,829 vehicles
Newest structure2024