Longest Bridges in New Hampshire
The longest bridge in New Hampshire is the US 1 Bypass over Piscataqua River Rr, at 0.5 miles (2,784 ft) of total structure length. The table below ranks the longest bridges in New Hampshire by structure length.
| Bridge | County | Length | Year Built | Daily Traffic |
|---|---|---|---|---|
| US 1 Bypass over Piscataqua River Rr | Rockingham | 2,784 ft (0.5 mi) | 2017 | 11,064 |
| Nh119 over Connecticut River Necrr | Cheshire | 1,905 ft (0.4 mi) | 2024 | 8,409 |
| I-95 over Preble Way Csx | Rockingham | 1,810 ft (0.3 mi) | 1971 | 74,766 |
| US 4 Nh 16 Tpk SB over Little Bay RD | Strafford | 1,648 ft (0.3 mi) | 2018 | 33,938 |
| US 4 Nh 16 Tpk NB over Little Bay RD | Strafford | 1,598 ft (0.3 mi) | 1966 | 34,298 |
| Bridge Street WB over I-293 Nh 3a Csx Merr R | Hillsborough | 1,540 ft (0.3 mi) | 1990 | 8,778 |
| Bridge Street EB over I-293 Nh 3a Csx Merr R | Hillsborough | 1,540 ft (0.3 mi) | 1988 | 8,778 |
| Rocknham Mall Entr over Rockham BLVD Bk Parknlot | Rockingham | 1,456 ft (0.3 mi) | 1991 | 4,631 |
| I-95 over Piscataqua River | Rockingham | 1,344 ft (0.3 mi) | 1971 | 74,766 |
| Wieczorek DR over Merrimack R Nh 3a Csx | Hillsborough | 1,220 ft (0.2 mi) | 2011 | 57,651 |
| Nh 1a over Hampton River | Rockingham | 1,199 ft (0.2 mi) | 1949 | 9,402 |
| US 3 Nh 3a over I-293 Nh 3a Csx Merr R | Hillsborough | 1,186 ft (0.2 mi) | 1923 | 22,640 |
| US 4 over Bellamy River | Strafford | 1,138 ft (0.2 mi) | 1998 | 19,707 |
| I-93 SB over Stevens Pond | Hillsborough | 1,126 ft (0.2 mi) | 1977 | 48,294 |
| Salmon Street EB over Merrimack R Csx RD Ramp | Hillsborough | 1,022 ft (0.2 mi) | 1970 | 13,150 |
| I-93 NB over Stevens Pond | Hillsborough | 1,009 ft (0.2 mi) | 1977 | 36,942 |
| I-293 SB Nh101 EB over Merrimack River Csx | Hillsborough | 922 ft (0.2 mi) | 1960 | 41,914 |
| I-293 NB Nh101 WB over Merrimack River Csx | Hillsborough | 922 ft (0.2 mi) | 1960 | 44,010 |
| Kelley Street over Piscataquog R Csx RD | Hillsborough | 908 ft (0.2 mi) | 1973 | 11,356 |
| US 1 over Piscataqua River | Rockingham | 902 ft (0.2 mi) | 1921 | 9,471 |
| Nh101 EB over Squamscott River | Rockingham | 879 ft (0.2 mi) | 1998 | 24,304 |
| Nh101 WB over Squamscott River | Rockingham | 879 ft (0.2 mi) | 1994 | 23,913 |
| Salmon Street WB over Merrimack River Csx RD | Hillsborough | 857 ft (0.2 mi) | 1970 | 17,799 |
| I-89 NB over Connecticut River Necrr | Grafton | 847 ft (0.2 mi) | 1966 | 22,288 |
| I-89 SB over Connecticut River Necrr | Grafton | 846 ft (0.2 mi) | 1966 | 21,268 |
| Ramp H over Fee Tpk | Hillsborough | 828 ft (0.2 mi) | 1993 | 9,004 |
| I-93 NB over Merrimack River Csx RD | Hillsborough | 826 ft (0.2 mi) | 1976 | 48,395 |
| I-93 SB over Merrimack River Csx RD | Hillsborough | 826 ft (0.2 mi) | 1976 | 34,000 |
| US 3 Nh 25 over Pemigewasset River Nhrr | Grafton | 799 ft (0.2 mi) | 1937 | 2,666 |
| Circumferential WB over Merrimack River Csx | Hillsborough | 771 ft (0.1 mi) | 1973 | 50,841 |
| Circumferential EB over Merrimack River Csx | Hillsborough | 741 ft (0.1 mi) | 2000 | 43,572 |
| US 3 over Merrimack River | Merrimack | 696 ft (0.1 mi) | 1998 | 26,707 |
| Nh 12 Nh103 over Connecticut River | Sullivan | 678 ft (0.1 mi) | 1969 | 9,277 |
| Main Street over Merrimack River Csx RD | Merrimack | 674 ft (0.1 mi) | 1976 | 15,760 |
| I-93 SB over Connecticut River | Grafton | 671 ft (0.1 mi) | 1981 | 3,544 |
| I-93 NB over Connecticut River | Grafton | 671 ft (0.1 mi) | 1976 | 3,621 |
| Church Street over Connecticut River Necrr | Cheshire | 634 ft (0.1 mi) | 1983 | 9,354 |
| I-93 SB over Stevens Pond | Hillsborough | 628 ft (0.1 mi) | 1976 | 28,328 |
| Nh111 WB over Merrimack River | Hillsborough | 602 ft (0.1 mi) | 1970 | 17,275 |
| Nh111 EB over Merrimack River | Hillsborough | 602 ft (0.1 mi) | 1973 | 15,615 |
| Nh111 over Harris RD Flatrock Bk | Rockingham | 601 ft (0.1 mi) | 2007 | 17,014 |
| US 4 over Merrimack River | Merrimack | 592 ft (0.1 mi) | 2005 | 15,071 |
| Bridge Hill Road over Connecticut River | Coos | 590 ft (0.1 mi) | 1997 | 870 |
| I-93 SB over US 3 Pemigewasset River | Grafton | 579 ft (0.1 mi) | 1969 | 10,052 |
| I-93 NB over US 3 Pemigewasset River | Grafton | 557 ft (0.1 mi) | 1969 | 10,012 |
| Nh 1b over Piscataqua Estuary | Rockingham | 543 ft (0.1 mi) | 1955 | 3,041 |
| Nh 49 over Mad River | Grafton | 540 ft (0.1 mi) | 1979 | 2,828 |
| Nh 18 over Connecticut River | Grafton | 533 ft (0.1 mi) | 1934 | 1,508 |
| Nh 25 over Ossipee River | Carroll | 524 ft (0.1 mi) | 2004 | 2,854 |
| I-393 US 4 Us202 over Merrimack River | Merrimack | 524 ft (0.1 mi) | 1978 | 40,527 |
| Nh 9(loudon Road) over Merrimack River | Merrimack | 524 ft (0.1 mi) | 1966 | 23,721 |
| I-93 US 4 SB over Merrimack River | Merrimack | 523 ft (0.1 mi) | 1959 | 25,801 |
| I-93 US 4 NB over Merrimack River | Merrimack | 523 ft (0.1 mi) | 1959 | 25,855 |
| Nh 11 over Connecticut River | Sullivan | 500 ft (0.1 mi) | 1900 | 6,519 |
| Newbury Road over Connecticut River | Grafton | 493 ft (0.1 mi) | 1970 | 2,136 |
| Meadow Road over Androscoggin River | Coos | 490 ft (0.1 mi) | 1984 | 157 |
| Gulf Road over Salmon Falls River | Strafford | 488 ft (0.1 mi) | 1950 | 6,132 |
| Nh 1b over Piscataqua Estuary | Rockingham | 483 ft (0.1 mi) | 1955 | 3,041 |
| US 3 Nh 11 over Winnisquam Lake | Belknap | 474 ft (0.1 mi) | 1973 | 16,322 |
| East Thetford Road over Connecticut River | Grafton | 471 ft (0.1 mi) | 1937 | 2,160 |
| I-93 NB over Nh101 WB Sbe Ramp | Hillsborough | 471 ft (0.1 mi) | 1977 | 25,082 |
| Granite Street over Merrimack River | Hillsborough | 471 ft (0.1 mi) | 1981 | 21,111 |
| Nh135 over Ammonoosuc River | Grafton | 470 ft (0.1 mi) | 1998 | 1,409 |
| Nh123 over Connecticut River | Cheshire | 467 ft (0.1 mi) | 1910 | 8,425 |
| Nh 10a Wheelock ST over Connecticut River | Grafton | 465 ft (0.1 mi) | 1998 | 12,683 |
| Nh 77 over Canal 2 Choate Bk | Hillsborough | 453 ft (0.1 mi) | 1960 | 4,701 |
| US 4 over Connecticut River | Grafton | 451 ft (0.1 mi) | 2015 | 11,594 |
| Cornish Toll Br RD over Connecticut River | Sullivan | 449 ft (0.1 mi) | 1866 | 2,722 |
| Nh 9 over Connecticut River | Cheshire | 446 ft (0.1 mi) | 2003 | 11,517 |
| US 4 over Rec Trail Mascoma River | Grafton | 443 ft (0.1 mi) | 2015 | 10,801 |
| US 3 over Suncook River Buck ST | Merrimack | 439 ft (0.1 mi) | 2007 | 9,285 |
| Wieczorek DR over Little Cohas Brook | Rockingham | 439 ft (0.1 mi) | 2011 | 8,168 |
| Ramp E(camp St) over Csx | Hillsborough | 436 ft (0.1 mi) | 1970 | 3,341 |
| Nh 25a over Connecticut River | Grafton | 433 ft (0.1 mi) | 1937 | 3,625 |
| Cross Street over I-93 | Rockingham | 433 ft (0.1 mi) | 2007 | 6,905 |
| Nh 16trk Unity ST over Androscoggin River | Coos | 432 ft (0.1 mi) | 1982 | 4,023 |
| I-93 SB over Pemigewasset River | Grafton | 424 ft (0.1 mi) | 1964 | 11,571 |
| I-93 NB over Pemigewasset River | Grafton | 424 ft (0.1 mi) | 1964 | 11,461 |
| Nh 1a over Sagamore Creek | Rockingham | 423 ft (0.1 mi) | 2015 | 6,704 |
| Vt105 Bridge ST over Connecticut River | Coos | 419 ft (0.1 mi) | 1947 | 1,124 |
| Us302 over Saco River | Carroll | 418 ft (0.1 mi) | 1972 | 13,313 |
| Nh 16 Nh 25 over Bearcamp River | Carroll | 418 ft (0.1 mi) | 2021 | 11,700 |
| Cross Road over Pemigewasset River | Grafton | 416 ft (0.1 mi) | 1973 | 775 |
| Nh108 over Squamscott River | Rockingham | 416 ft (0.1 mi) | 2001 | 13,846 |
| Nh104 over Pemigewasset River | Grafton | 411 ft (0.1 mi) | 1987 | 9,297 |
| Nh 9 over Beards Brook Beards RD | Hillsborough | 411 ft (0.1 mi) | 2002 | 7,409 |
| Broad ST Parkway over Nashua River | Hillsborough | 411 ft (0.1 mi) | 2016 | 1,100 |
| I-393 US 4 Us202e over Soucook River | Merrimack | 411 ft (0.1 mi) | 1988 | 8,857 |
| I-93 SB over Nh111 | Rockingham | 409 ft (0.1 mi) | 2014 | 42,082 |
| I-93 SB over Pemigewasset River | Grafton | 409 ft (0.1 mi) | 1969 | 7,613 |
| I-93 NB over Pemigewasset River | Grafton | 409 ft (0.1 mi) | 1969 | 7,498 |
| Nh 16 over Saco River | Carroll | 408 ft (0.1 mi) | 1945 | 12,188 |
| US 2 over Connecticut River | Coos | 408 ft (0.1 mi) | 2020 | 3,840 |
| I-93 SB over Pemigewasset River | Grafton | 408 ft (0.1 mi) | 1970 | 7,166 |
| I-93 NB over Pemigewasset River | Grafton | 408 ft (0.1 mi) | 1970 | 7,017 |
| Sewalls Falls Road over Merrimack River | Merrimack | 407 ft (0.1 mi) | 2016 | 3,708 |
| US 3 Nh 11 Nh127 over Pemigewasset River | Merrimack | 405 ft (0.1 mi) | 1994 | 12,379 |
| Us302 Nh 10 over Ammonoosuc River | Grafton | 400 ft (0.1 mi) | 1983 | 3,265 |
| Nh 25 over Bearcamp River | Carroll | 396 ft (0.1 mi) | 2005 | 4,213 |
| I-393 US 4 Us202w over Soucook River | Merrimack | 395 ft (0.1 mi) | 1988 | 8,164 |
| Barnet Road over Connecticut River | Grafton | 389 ft (0.1 mi) | 1937 | 992 |
| I-93 NB over Nh111 | Rockingham | 387 ft (0.1 mi) | 2011 | 41,528 |
| US 4 Nh 10 over Mascoma River Csx | Grafton | 382 ft (0.1 mi) | 1945 | 13,685 |
| Nh121 over Little River Csx | Rockingham | 381 ft (0.1 mi) | 2006 | 10,799 |
| West Bath Road over Ammonoosuc R Nhrr(abd) | Grafton | 375 ft (0.1 mi) | 1832 | 96 |
| Nh175a over Pemigewasset River | Grafton | 365 ft (0.1 mi) | 2006 | 7,661 |
| I-93 NB over E Br Pemigewasset River | Grafton | 365 ft (0.1 mi) | 1972 | 7,160 |
| Nh106 Main ST over Winnipesaukee River | Belknap | 361 ft (0.1 mi) | 1970 | 18,507 |
| Us302 Nh 10 over Nhrr(abd) | Grafton | 359 ft (0.1 mi) | 1990 | 4,216 |
| Nh 25 over Connecticut River | Grafton | 354 ft (0.1 mi) | 1929 | 2,403 |
| Nh151 over I-95 | Rockingham | 351 ft (0.1 mi) | 1975 | 3,412 |
| Main Street over Mascoma Lake | Grafton | 345 ft (0.1 mi) | 2012 | 1,358 |
| Nh101 WB over I-95 | Rockingham | 342 ft (0.1 mi) | 2000 | 9,431 |
| I-93 SB over Nhrr Winnipesaukee River | Merrimack | 341 ft (0.1 mi) | 1960 | 15,417 |
| Howe Hill Road over I-89 | Sullivan | 341 ft (0.1 mi) | 1967 | 95 |
| Nh101 EB over I-95 | Rockingham | 341 ft (0.1 mi) | 1999 | 9,431 |
| Nh101 over Nh101a Csx | Hillsborough | 339 ft (0.1 mi) | 1971 | 15,196 |
| Nh119 over Connecticut River | Cheshire | 338 ft (0.1 mi) | 1920 | 8,535 |
| Nh102 over I-93 | Rockingham | 338 ft (0.1 mi) | 2018 | 34,331 |
| US 3 Fee Tpk SB over Nashua River | Hillsborough | 337 ft (0.1 mi) | 1959 | 71,221 |
| US 3 Fee Tpk NB over Nashua River | Hillsborough | 337 ft (0.1 mi) | 1955 | 73,979 |
| I-93 SB over Skookumchuck Brook | Grafton | 335 ft (0.1 mi) | 1987 | 5,092 |
| I-93 NB over Skookumchuck Brook | Grafton | 335 ft (0.1 mi) | 1987 | 5,128 |
| Western AVE over Contoocook River | Merrimack | 335 ft (0.1 mi) | 2017 | 551 |
| I-93 NB over Nhrr Winnipesaukee River | Merrimack | 333 ft (0.1 mi) | 1960 | 15,544 |
| Grandview Road over I-93 Fee Tpk | Merrimack | 331 ft (0.1 mi) | 1978 | 1,142 |
| Nh132 over I-93 | Merrimack | 331 ft (0.1 mi) | 1959 | 1,052 |
| North Road over Nh101 | Rockingham | 330 ft (0.1 mi) | 1992 | 3,113 |
| I-93 SB over I-293 Fee Tpk | Merrimack | 326 ft (0.1 mi) | 1977 | 21,233 |
| Industrial Park RD over Ammonoosuc River | Grafton | 321 ft (0.1 mi) | 1995 | 2,234 |
| Nh175 over Pemigewasset River | Grafton | 319 ft (0.1 mi) | 1976 | 682 |
| Us202 Nh 9 over Elm Brook | Merrimack | 314 ft (0.1 mi) | 1961 | 17,117 |
| Guildhall Road over Connecticut River | Coos | 314 ft (0.1 mi) | 1984 | 815 |
| Us202 Nh 9 over Contoocook River | Merrimack | 313 ft (0.1 mi) | 1961 | 17,117 |
| Ash Street over I-93 | Rockingham | 313 ft (0.1 mi) | 2019 | 7,299 |
| Brookdale Road over I-93 | Rockingham | 312 ft (0.1 mi) | 2012 | 1,124 |
| Nh 16 Sp Tpk over Lyman Brook | Strafford | 312 ft (0.1 mi) | 1980 | 16,645 |
| Bible Hill Road over Nh 9 Ramp A | Hillsborough | 311 ft (0.1 mi) | 2000 | 96 |
| Mcindoes Street over Connecticut River | Grafton | 308 ft (0.1 mi) | 1930 | 444 |
| I-89 SB over Mascoma R Riverside DR | Grafton | 307 ft (0.1 mi) | 1966 | 16,677 |
| Nh 28a over I-93 | Hillsborough | 307 ft (0.1 mi) | 1976 | 6,695 |
| I-89 Nh 10 NB over Riverside DR Mascoma Riv | Grafton | 306 ft (0.1 mi) | 1966 | 16,261 |
| Nh 16trk 12th ST over Androscoggin River | Coos | 304 ft (0.1 mi) | 1975 | 2,827 |
| Us302 Nh 10 over Ammonoosuc River | Grafton | 304 ft (0.1 mi) | 1980 | 4,777 |
| Nh 9 over I-393 US 4 Us202 | Merrimack | 301 ft (0.1 mi) | 1988 | 8,465 |
| Pinnacle Hill Road over I-93 | Belknap | 299 ft (0.1 mi) | 1963 | 129 |
| Huse Road over I-293 Nh101 | Hillsborough | 299 ft (0.1 mi) | 1960 | 7,350 |
| Walker Street over Piscataqua R Back Chan | Rockingham | 299 ft (0.1 mi) | 1913 | 7,000 |
| Nh 16 Sp Tpk SB over Nh108 Csx(abd) | Strafford | 299 ft (0.1 mi) | 1957 | 21,323 |
| Nh119 over Connecticut River | Cheshire | 296 ft (0.1 mi) | 1920 | 8,535 |
| Nh111 over I-95 | Rockingham | 295 ft (0.1 mi) | 1975 | 7,327 |
| I-93 Parkway over Bike Path Lafayette Bk | Grafton | 294 ft (0.1 mi) | 1987 | 10,220 |
| Nh132(eastside Dr) over I-393 US 4 Us202 | Merrimack | 294 ft (0.1 mi) | 1978 | 9,347 |
| Loon Mountain Road over E Br Pemigewasset River | Grafton | 294 ft (0.1 mi) | 2016 | 1,555 |
| Nh 27 over I-95 | Rockingham | 293 ft (0.1 mi) | 1976 | 10,248 |
| Nh 9 over Old Nh 9 Granite Lk Out | Cheshire | 289 ft (0.1 mi) | 1994 | 6,118 |
| Walnut AVE over I-95 | Rockingham | 289 ft (0.1 mi) | 1975 | 995 |
| Us302 Nh 18 Nh116 over I-93 | Grafton | 288 ft (0.1 mi) | 1959 | 3,454 |
| Blair Road over Pemigewasset River | Grafton | 288 ft (0.1 mi) | 1869 | 1,584 |
| North Ashland Road over I-93 | Grafton | 287 ft (0.1 mi) | 1963 | 728 |
| Nh 33 over I-95 | Rockingham | 285 ft (0.1 mi) | 1971 | 18,255 |
| I-93 SB over E Br Pemigewasset River | Grafton | 283 ft (0.1 mi) | 1972 | 7,285 |
| Nh111 over US 3 Fee Tpk | Hillsborough | 283 ft (0.1 mi) | 1998 | 34,337 |
| I-93 SB over Ammonoosuc River | Grafton | 282 ft (0.1 mi) | 1960 | 4,499 |
| I-93 NB over Ammonoosuc River | Grafton | 282 ft (0.1 mi) | 1960 | 4,235 |
| I-93 SB On Ramp over I-93 | Grafton | 280 ft (0.1 mi) | 1959 | 2,646 |
| Pierces Island RD over Little Harbor | Rockingham | 280 ft (0.1 mi) | 1958 | 1,272 |
| Nh 12a over Sugar River | Sullivan | 280 ft (0.1 mi) | 1967 | 1,067 |
| Nh135 over I-93 | Grafton | 279 ft (0.1 mi) | 1981 | 4,909 |
| Nh175 over Pemigewasset River | Grafton | 279 ft (0.1 mi) | 1976 | 682 |
| Nh127 over Spillway Channel | Merrimack | 275 ft (0.1 mi) | 1961 | 3,434 |
| I-95(RAMP B-d) over I-95 | Rockingham | 275 ft (0.1 mi) | 1976 | 19,641 |
| Bridge Street over Androscoggin River | Coos | 273 ft (0.1 mi) | 1969 | 985 |
| Green Road over Nh101 | Rockingham | 273 ft (0.1 mi) | 1982 | 528 |
| Pine Street over I-93 Fee Tpk | Merrimack | 272 ft (0.1 mi) | 1978 | 2,263 |
| Jewett Road over I-89 | Merrimack | 271 ft (0.1 mi) | 1959 | 1,716 |
| Ocean Road over I-95 | Rockingham | 270 ft (0.1 mi) | 1972 | 8,244 |
| Us302 over Connecticut River | Grafton | 270 ft (0.1 mi) | 1928 | 7,367 |
| I-293 EB Nh101 EB over Fee Tpk | Hillsborough | 270 ft (0.1 mi) | 1993 | 33,533 |
| Horse Hill Road over Contoocook River | Merrimack | 270 ft (0.1 mi) | 1981 | 2,615 |
| Hilltop Road over I-93 | Grafton | 269 ft (0.1 mi) | 1985 | 354 |
| Tremont Street over Contoocook River | Merrimack | 269 ft (0.1 mi) | 1955 | 6,767 |
| Sp Tpk SB On Ramp over Cocheco River | Strafford | 269 ft (0.1 mi) | 2009 | 2,280 |
| I-93 Ramp over Fee Tpk | Merrimack | 268 ft (0.1 mi) | 1976 | 761 |
| Nh 16 Sp Tpk SB over Cocheco River | Strafford | 267 ft (0.1 mi) | 1957 | 23,607 |
| Nh 16 Sp Tpk NB over Cocheco River | Strafford | 267 ft (0.1 mi) | 1957 | 22,560 |
| Mt Orne Road over Connecticut River | Coos | 266 ft (0.1 mi) | 1911 | 642 |
| Woodbury Avenue over Sp Tpk US 4 Nh 16 | Rockingham | 265 ft (0.1 mi) | 2015 | 8,800 |
| Depot Road over Ashuelot River | Cheshire | 265 ft (0.1 mi) | 1978 | 317 |
| River Road over I-93 | Hillsborough | 265 ft (0.1 mi) | 1975 | 6,128 |
| Towle Farm Road over I-95 | Rockingham | 264 ft (0.1 mi) | 1974 | 2,242 |
| I-93 Fee Tpk SB over I-89 Turkey River Ped | Merrimack | 263 ft (0.0 mi) | 2014 | 35,573 |
| I-93 Fee Tpk NB over I-89 Turkey River | Merrimack | 263 ft (0.0 mi) | 2014 | 34,805 |
| South Road over I-95 | Rockingham | 263 ft (0.0 mi) | 1975 | 1,808 |
| Nh127 over I-89 | Merrimack | 262 ft (0.0 mi) | 1994 | 3,866 |
| Nh101 Ramp A-b over Nh101 | Rockingham | 259 ft (0.0 mi) | 1981 | 6,073 |
| Nh 25 Nh 3a over Baker River | Grafton | 258 ft (0.0 mi) | 1968 | 13,729 |
| West Portsmouth ST over I-93 US 4 | Merrimack | 258 ft (0.0 mi) | 2000 | 4,541 |
| Nh 88 over I-95 | Rockingham | 257 ft (0.0 mi) | 1975 | 3,566 |
| US 3 Nh 11 Nh132 over I-93 | Belknap | 256 ft (0.0 mi) | 2000 | 23,105 |