Longest Bridges in New Hampshire

The longest bridge in New Hampshire spans 2784.1 feet. The table below ranks the state's bridges by total structure length — from major river crossings and causeway spans to long highway overpasses.

How this ranking works

Length comes from the NBI structure length field and is shown in feet. It is best read as a scale and maintenance-complexity signal, not by itself as a safety signal.

Bridge	County	Length	Condition	Year Built
US 1 Bypass over Piscataqua River Rr	Rockingham	2784.1 ft	Good	2017
Nh119 over Connecticut River Necrr	Cheshire	1905.5 ft	Good	2024
I-95 over Preble Way Csx	Rockingham	1810.0 ft	Fair	1971
US 4 Nh 16 Tpk SB over Little Bay RD	Strafford	1648.6 ft	Good	2018
US 4 Nh 16 Tpk NB over Little Bay RD	Strafford	1598.1 ft	Good	1966
Bridge Street WB over I-293 Nh 3a Csx Merr R	Hillsborough	1540.0 ft	Fair	1990
Bridge Street EB over I-293 Nh 3a Csx Merr R	Hillsborough	1540.0 ft	Fair	1988
Rocknham Mall Entr over Rockham BLVD Bk Parknlot	Rockingham	1456.0 ft	Fair	1991
I-95 over Piscataqua River	Rockingham	1344.2 ft	Fair	1971
Wieczorek DR over Merrimack R Nh 3a Csx	Hillsborough	1220.1 ft	Good	2011
Nh 1a over Hampton River	Rockingham	1199.1 ft	Poor	1949
US 3 Nh 3a over I-293 Nh 3a Csx Merr R	Hillsborough	1186.0 ft	Fair	1923
US 4 over Bellamy River	Strafford	1138.8 ft	Good	1998
I-93 SB over Stevens Pond	Hillsborough	1127.0 ft	Fair	1977
Salmon Street EB over Merrimack R Csx RD Ramp	Hillsborough	1023.0 ft	Poor	1970
I-93 NB over Stevens Pond	Hillsborough	1009.8 ft	Fair	1977
I-293 SB Nh101 EB over Merrimack River Csx	Hillsborough	922.9 ft	Fair	1960
I-293 NB Nh101 WB over Merrimack River Csx	Hillsborough	922.9 ft	Fair	1960
Kelley Street over Piscataquog R Csx RD	Hillsborough	908.1 ft	Good	1973
US 1 over Piscataqua River	Rockingham	902.6 ft	Good	1921
Nh101 EB over Squamscott River	Rockingham	879.9 ft	Good	1998
Nh101 WB over Squamscott River	Rockingham	879.9 ft	Good	1994
Salmon Street WB over Merrimack River Csx RD	Hillsborough	857.9 ft	Fair	1970
I-89 NB over Connecticut River Necrr	Grafton	847.1 ft	Poor	1966
I-89 SB over Connecticut River Necrr	Grafton	846.1 ft	Poor	1966
Ramp H over Fee Tpk	Hillsborough	828.1 ft	Fair	1993
I-93 NB over Merrimack River Csx RD	Hillsborough	826.1 ft	Fair	1976
I-93 SB over Merrimack River Csx RD	Hillsborough	826.1 ft	Fair	1976
US 3 Nh 25 over Pemigewasset River Nhrr	Grafton	799.9 ft	Fair	1937
Circumferential WB over Merrimack River Csx	Hillsborough	772.0 ft	Good	1973
Circumferential EB over Merrimack River Csx	Hillsborough	741.1 ft	Good	2000
US 3 over Merrimack River	Merrimack	696.9 ft	Fair	1998
Nh 12 Nh103 over Connecticut River	Sullivan	678.1 ft	Fair	1969
Main Street over Merrimack River Csx RD	Merrimack	674.9 ft	Good	1976
I-93 SB over Connecticut River	Grafton	671.9 ft	Good	1981
I-93 NB over Connecticut River	Grafton	671.9 ft	Good	1976
Church Street over Connecticut River Necrr	Cheshire	634.8 ft	Good	1983
I-93 SB over Stevens Pond	Hillsborough	628.6 ft	Fair	1976
Nh111 WB over Merrimack River	Hillsborough	602.0 ft	Fair	1970
Nh111 EB over Merrimack River	Hillsborough	602.0 ft	Fair	1973
Nh111 over Harris RD Flatrock Bk	Rockingham	601.0 ft	Good	2007
US 4 over Merrimack River	Merrimack	592.8 ft	Good	2005
Bridge Hill Road over Connecticut River	Coos	590.9 ft	Good	1997
I-93 SB over US 3 Pemigewasset River	Grafton	579.1 ft	Fair	1969
I-93 NB over US 3 Pemigewasset River	Grafton	557.1 ft	Fair	1969
Nh 1b over Piscataqua Estuary	Rockingham	544.0 ft	Fair	1955
Nh 49 over Mad River	Grafton	540.0 ft	Poor	1979
Nh 18 over Connecticut River	Grafton	533.1 ft	Poor	1934
Nh 25 over Ossipee River	Carroll	524.9 ft	Good	2004
I-393 US 4 Us202 over Merrimack River	Merrimack	524.9 ft	Fair	1978
Nh 9(loudon Road) over Merrimack River	Merrimack	524.9 ft	Poor	1966
I-93 US 4 SB over Merrimack River	Merrimack	524.0 ft	Fair	1959
I-93 US 4 NB over Merrimack River	Merrimack	524.0 ft	Fair	1959
Nh 11 over Connecticut River	Sullivan	500.0 ft	Fair	1900
Newbury Road over Connecticut River	Grafton	493.1 ft	Fair	1970
Meadow Road over Androscoggin River	Coos	490.2 ft	Good	1984
Gulf Road over Salmon Falls River	Strafford	488.8 ft	Poor	1950
Nh 1b over Piscataqua Estuary	Rockingham	483.9 ft	Fair	1955
US 3 Nh 11 over Winnisquam Lake	Belknap	474.1 ft	Good	1973
East Thetford Road over Connecticut River	Grafton	471.1 ft	Poor	1937
I-93 NB over Nh101 WB Sbe Ramp	Hillsborough	471.1 ft	Fair	1977
Granite Street over Merrimack River	Hillsborough	471.1 ft	Good	1981
Nh135 over Ammonoosuc River	Grafton	470.8 ft	Fair	1998
Nh123 over Connecticut River	Cheshire	467.8 ft	Fair	1910
Nh 10a Wheelock ST over Connecticut River	Grafton	465.2 ft	Fair	1998
Nh 77 over Canal 2 Choate Bk	Hillsborough	453.1 ft	Fair	1960
US 4 over Connecticut River	Grafton	451.8 ft	Good	2015
Cornish Toll Br RD over Connecticut River	Sullivan	449.1 ft	Poor	1866
Nh 9 over Connecticut River	Cheshire	446.9 ft	Good	2003
US 4 over Rec Trail Mascoma River	Grafton	443.6 ft	Good	2015
US 3 over Suncook River Buck ST	Merrimack	440.0 ft	Good	2007
Wieczorek DR over Little Cohas Brook	Rockingham	439.6 ft	Good	2011
Ramp E(camp St) over Csx	Hillsborough	436.0 ft	Fair	1970
Nh 25a over Connecticut River	Grafton	433.7 ft	Fair	1937
Cross Street over I-93	Rockingham	433.1 ft	Good	2007
Nh 16trk Unity ST over Androscoggin River	Coos	432.1 ft	Fair	1982
I-93 SB over Pemigewasset River	Grafton	424.9 ft	Good	1964
I-93 NB over Pemigewasset River	Grafton	424.9 ft	Fair	1964
Nh 1a over Sagamore Creek	Rockingham	423.9 ft	Good	2015
Vt105 Bridge ST over Connecticut River	Coos	419.9 ft	Fair	1947
Us302 over Saco River	Carroll	419.0 ft	Fair	1972
Nh 16 Nh 25 over Bearcamp River	Carroll	419.0 ft	Good	2021
Cross Road over Pemigewasset River	Grafton	417.0 ft	Good	1973
Nh108 over Squamscott River	Rockingham	416.7 ft	Good	2001
Nh104 over Pemigewasset River	Grafton	411.1 ft	Fair	1987
Nh 9 over Beards Brook Beards RD	Hillsborough	411.1 ft	Good	2002
Broad ST Parkway over Nashua River	Hillsborough	411.1 ft	Good	2016
I-393 US 4 Us202e over Soucook River	Merrimack	411.1 ft	Good	1988
I-93 SB over Nh111	Rockingham	409.8 ft	Good	2014
I-93 SB over Pemigewasset River	Grafton	409.1 ft	Good	1969
I-93 NB over Pemigewasset River	Grafton	409.1 ft	Good	1969
Nh 16 over Saco River	Carroll	408.1 ft	Fair	1945
US 2 over Connecticut River	Coos	408.1 ft	Good	2020
I-93 SB over Pemigewasset River	Grafton	408.1 ft	Fair	1970
I-93 NB over Pemigewasset River	Grafton	408.1 ft	Fair	1970
Sewalls Falls Road over Merrimack River	Merrimack	407.2 ft	Good	2016
US 3 Nh 11 Nh127 over Pemigewasset River	Merrimack	405.8 ft	Good	1994
Us302 Nh 10 over Ammonoosuc River	Grafton	400.9 ft	Good	1983
Nh 25 over Bearcamp River	Carroll	397.0 ft	Good	2005
I-393 US 4 Us202w over Soucook River	Merrimack	396.0 ft	Good	1988
Barnet Road over Connecticut River	Grafton	389.1 ft	Fair	1937
I-93 NB over Nh111	Rockingham	387.1 ft	Good	2011
US 4 Nh 10 over Mascoma River Csx	Grafton	382.9 ft	Good	1945
Nh121 over Little River Csx	Rockingham	381.9 ft	Good	2006
West Bath Road over Ammonoosuc R Nhrr(abd)	Grafton	375.0 ft	Fair	1832
Nh175a over Pemigewasset River	Grafton	365.5 ft	Good	2006
I-93 NB over E Br Pemigewasset River	Grafton	365.2 ft	Fair	1972
Nh106 Main ST over Winnipesaukee River	Belknap	361.9 ft	Fair	1970
Us302 Nh 10 over Nhrr(abd)	Grafton	359.9 ft	Good	1990
Nh 25 over Connecticut River	Grafton	355.0 ft	Fair	1929
Nh151 over I-95	Rockingham	351.0 ft	Fair	1975
Main Street over Mascoma Lake	Grafton	345.1 ft	Good	2012
Nh101 WB over I-95	Rockingham	342.8 ft	Good	2000
I-93 SB over Nhrr Winnipesaukee River	Merrimack	341.9 ft	Good	1960
Howe Hill Road over I-89	Sullivan	341.9 ft	Fair	1967
Nh101 EB over I-95	Rockingham	341.5 ft	Good	1999
Nh101 over Nh101a Csx	Hillsborough	339.9 ft	Fair	1971
Nh119 over Connecticut River	Cheshire	338.9 ft	Poor	1920
Nh102 over I-93	Rockingham	338.6 ft	Good	2018
US 3 Fee Tpk SB over Nashua River	Hillsborough	337.9 ft	Good	1959
US 3 Fee Tpk NB over Nashua River	Hillsborough	337.9 ft	Fair	1955
I-93 SB over Skookumchuck Brook	Grafton	336.0 ft	Good	1987
I-93 NB over Skookumchuck Brook	Grafton	336.0 ft	Fair	1987
Western AVE over Contoocook River	Merrimack	336.0 ft	Good	2017
I-93 NB over Nhrr Winnipesaukee River	Merrimack	333.0 ft	Good	1960
Grandview Road over I-93 Fee Tpk	Merrimack	331.0 ft	Fair	1978
Nh132 over I-93	Merrimack	331.0 ft	Good	1959
North Road over Nh101	Rockingham	330.1 ft	Good	1992
I-93 SB over I-293 Fee Tpk	Merrimack	326.1 ft	Good	1977
Industrial Park RD over Ammonoosuc River	Grafton	321.9 ft	Good	1995
Nh175 over Pemigewasset River	Grafton	319.9 ft	Good	1976
Us202 Nh 9 over Elm Brook	Merrimack	315.0 ft	Fair	1961
Guildhall Road over Connecticut River	Coos	314.6 ft	Fair	1984
Us202 Nh 9 over Contoocook River	Merrimack	314.0 ft	Fair	1961
Ash Street over I-93	Rockingham	313.6 ft	Good	2019
Brookdale Road over I-93	Rockingham	313.0 ft	Good	2012
Nh 16 Sp Tpk over Lyman Brook	Strafford	312.0 ft	Fair	1980
Bible Hill Road over Nh 9 Ramp A	Hillsborough	311.0 ft	Good	2000
Mcindoes Street over Connecticut River	Grafton	308.1 ft	Fair	1930
I-89 SB over Mascoma R Riverside DR	Grafton	307.1 ft	Good	1966
Nh 28a over I-93	Hillsborough	307.1 ft	Good	1976
I-89 Nh 10 NB over Riverside DR Mascoma Riv	Grafton	306.1 ft	Good	1966
Nh 16trk 12th ST over Androscoggin River	Coos	304.1 ft	Fair	1975
Us302 Nh 10 over Ammonoosuc River	Grafton	304.1 ft	Fair	1980
Nh 9 over I-393 US 4 Us202	Merrimack	301.8 ft	Good	1988
Pinnacle Hill Road over I-93	Belknap	299.9 ft	Fair	1963
Huse Road over I-293 Nh101	Hillsborough	299.9 ft	Good	1960
Walker Street over Piscataqua R Back Chan	Rockingham	299.9 ft	Fair	1913
Nh 16 Sp Tpk SB over Nh108 Csx(abd)	Strafford	299.9 ft	Poor	1957
Nh119 over Connecticut River	Cheshire	296.9 ft	Poor	1920
Nh111 over I-95	Rockingham	295.9 ft	Fair	1975
I-93 Parkway over Bike Path Lafayette Bk	Grafton	294.9 ft	Fair	1987
Nh132(eastside Dr) over I-393 US 4 Us202	Merrimack	294.9 ft	Fair	1978
Loon Mountain Road over E Br Pemigewasset River	Grafton	294.6 ft	Good	2016
Nh 27 over I-95	Rockingham	294.0 ft	Fair	1976
Nh 9 over Old Nh 9 Granite Lk Out	Cheshire	289.4 ft	Fair	1994
Walnut AVE over I-95	Rockingham	289.0 ft	Good	1975
Us302 Nh 18 Nh116 over I-93	Grafton	288.1 ft	Fair	1959
Blair Road over Pemigewasset River	Grafton	288.1 ft	Fair	1869
North Ashland Road over I-93	Grafton	287.1 ft	Good	1963
Nh 33 over I-95	Rockingham	285.1 ft	Fair	1971
I-93 SB over E Br Pemigewasset River	Grafton	283.1 ft	Good	1972
Nh111 over US 3 Fee Tpk	Hillsborough	283.1 ft	Fair	1998
I-93 SB over Ammonoosuc River	Grafton	282.2 ft	Fair	1960
I-93 NB over Ammonoosuc River	Grafton	282.2 ft	Fair	1960
I-93 SB On Ramp over I-93	Grafton	280.8 ft	Fair	1959
Pierces Island RD over Little Harbor	Rockingham	280.8 ft	Fair	1958
Nh 12a over Sugar River	Sullivan	280.8 ft	Poor	1967
Nh135 over I-93	Grafton	279.9 ft	Fair	1981
Nh175 over Pemigewasset River	Grafton	279.9 ft	Fair	1976
Nh127 over Spillway Channel	Merrimack	275.9 ft	Fair	1961
I-95(RAMP B-d) over I-95	Rockingham	275.9 ft	Fair	1976
Bridge Street over Androscoggin River	Coos	274.0 ft	Fair	1969
Green Road over Nh101	Rockingham	273.3 ft	Fair	1982
Pine Street over I-93 Fee Tpk	Merrimack	273.0 ft	Fair	1978
Jewett Road over I-89	Merrimack	272.0 ft	Fair	1959
Ocean Road over I-95	Rockingham	271.0 ft	Fair	1972
Us302 over Connecticut River	Grafton	270.0 ft	Fair	1928
I-293 EB Nh101 EB over Fee Tpk	Hillsborough	270.0 ft	Good	1993
Horse Hill Road over Contoocook River	Merrimack	270.0 ft	Fair	1981
Hilltop Road over I-93	Grafton	269.0 ft	Good	1985
Tremont Street over Contoocook River	Merrimack	269.0 ft	Fair	1955
Sp Tpk SB On Ramp over Cocheco River	Strafford	269.0 ft	Good	2009
I-93 Ramp over Fee Tpk	Merrimack	268.0 ft	Fair	1976
Nh 16 Sp Tpk SB over Cocheco River	Strafford	267.1 ft	Poor	1957
Nh 16 Sp Tpk NB over Cocheco River	Strafford	267.1 ft	Poor	1957
Mt Orne Road over Connecticut River	Coos	266.1 ft	Fair	1911
Woodbury Avenue over Sp Tpk US 4 Nh 16	Rockingham	265.4 ft	Good	2015
Depot Road over Ashuelot River	Cheshire	265.1 ft	Fair	1978
River Road over I-93	Hillsborough	265.1 ft	Good	1975
Towle Farm Road over I-95	Rockingham	264.1 ft	Fair	1974
I-93 Fee Tpk SB over I-89 Turkey River Ped	Merrimack	263.1 ft	Good	2014
I-93 Fee Tpk NB over I-89 Turkey River	Merrimack	263.1 ft	Good	2014
South Road over I-95	Rockingham	263.1 ft	Fair	1975
Nh127 over I-89	Merrimack	262.1 ft	Fair	1994
Nh101 Ramp A-b over Nh101	Rockingham	259.8 ft	Good	1981
Nh 25 Nh 3a over Baker River	Grafton	258.9 ft	Good	1968
West Portsmouth ST over I-93 US 4	Merrimack	258.9 ft	Fair	2000
Nh 88 over I-95	Rockingham	257.9 ft	Fair	1975
US 3 Nh 11 Nh132 over I-93	Belknap	256.9 ft	Good	2000