Total Bridges
2,542
Public highway bridges in New Hampshire
State profile · Near national median SD
New Hampshire bridge safety
Condition ratings, load ratings, and structural-deficiency data for every public highway bridge in New Hampshire — drawn straight from the FHWA National Bridge Inventory.
- 2,542
- Public bridges
- 43.0%
- Good condition
- 7.1%
- Poor condition
- 7.1%
- Structurally deficient
Good Condition
43.0%
1,092 bridges rated 7-9
-7.0pp vs 50% benchmark
Poor Condition
7.1%
180 bridges rated 0-4
Structurally Deficient
7.1%
180 bridges flagged for repair priority
0.1pp vs national avg 7.0%
New Hampshire vs national bridge condition
New Hampshire — Good condition share 43.0%
National avg
Share of bridges rated 7-9 on the FHWA 0-9 scale (deck, superstructure, substructure all good).
New Hampshire — Structurally deficient share 23.6%
National avg
Lower is better. Bar maxes at 30% (worst-state ceiling). National average sits at 7.0%.
Condition Distribution
Bridge inventory deck-condition mix — New Hampshire (FHWA NBI)
New Hampshire vs nearby ranks
Adjacent states on the structurally deficient leaderboard (lower share = better)
States are ranked by share of bridges flagged structurally deficient — the FHWA classification for any span where deck, superstructure, or substructure carries a condition rating of 4 or below. Lower percentages indicate stronger maintenance funding and inspection follow-through. States here sit immediately above and below New Hampshire on the same metric.
36
New York
6.90% top marginal rate
21
Kentucky
7.06% top marginal rate
33
New Hampshire
7.08% top marginal rate
40
Oklahoma
7.50% top marginal rate
35
New Mexico
7.61% top marginal rate
Bridges Needing Most Attention in New Hampshire
Six lowest-condition bridges in New Hampshire, ranked by composite NBI rating. Each is inspected at least every 24 months.
OLD DEERFIELD ROAD
PoorOver: BROOK
185 FT FROM NH RTE 43, Rockingham, NH
Built 1920 Load: 1.8 t ADT: 190
TEMPLETON TURNPIKE
Structurally DeficientOver: PRIEST BROOK
1.9MI. RTE 119, Cheshire, NH
Built 1984 Load: 2.7 t ADT: 86
DUDLEY ROAD
Structurally DeficientOver: LAMPREY RIVER
.23 MI JCT 101, Rockingham, NH
Built 1914 Load: 2.9 t ADT: 535
SHOP ROAD
Structurally DeficientOver: NEEDLE SHOP BROOK
0.8 MI N NEW CHESTER RD, Merrimack, NH
Built 1930 Load: 3.3 t ADT: 63
WHITCOMB MILLS RD
PoorOver: WHITE BROOK
0.06 MI FR ARCH ST, Cheshire, NH
Built 1940 Load: 3.6 t ADT: 814
LEIGHTON MEADOW RD
Structurally DeficientOver: PHILLIPS BROOK
100 FT FR SULLIVAN RD 61, Coos, NH
Built 1940 Load: 3.6 t ADT: 90
All Bridges in New Hampshire
TERRACE STREET
FairOver: MINNEWAWA BROOK
210 FT FR NH RTE 101, Cheshire, NH
Built 1922 Load: 29.9 t ADT: 175
ELLSWORTH HILL RD
FairOver: CONNOR BROOK
3.6 MI ELLSWORTH TL, Grafton, NH
Built 1934 Load: 29.9 t ADT: 1,125
NH103
FairOver: LAKE TODD OUTLET
0.1 MI FROM NEWBURY TL, Merrimack, NH
Built 1967 Load: 29.9 t ADT: 4,601
US 3,NH 11
FairOver: MILE HILL ROAD
0.5 MI FROM BELMONT T.L., Belknap, NH
Built 1967 Load: 30.0 t ADT: 9,238
TOWN HALL ROAD
FairOver: EAST BRANCH SACO RIVER
1.9 MI FR NH 16&US 302, Carroll, NH
Built 1976 Load: 30.0 t ADT: 90
HANOVER CENTER RD
FairOver: BROOK
0.7 MI FR LYME TL, Grafton, NH
Built 1940 Load: 30.0 t ADT: 1,214
WEST HOLLIS ROAD
FairOver: NISSITISSIT RIVER
.1 MI N. MASS. LINE, Hillsborough, NH
Built 1978 Load: 30.0 t ADT: 1,513
I-89 NB
FairOver: OTTERVILLE ROAD
4.0 MI FROM SUTTON T.L., Merrimack, NH
Built 1967 Load: 30.0 t ADT: 9,100
NH 11
FairOver: CASCADE BROOK
1.7 MI FROM NEW LONDON TL, Merrimack, NH
Built 1960 Load: 30.0 t ADT: 5,015
NO DATA ENTERED
FairOver: SAWYER RIVER
MAP 32, Carroll, NH
Built 1978 Load: 30.1 t ADT: 50
WASHINGTON STREET
FairOver: SWIFT RIVER
0.2 MI FR WASHINGTON ST, Carroll, NH
Built 1975 Load: 30.2 t ADT: 1,214
I-93 SB
FairOver: STEVENS POND
0.1 MI N BRIDGE ST, Hillsborough, NH
Built 1976 Load: 30.2 t ADT: 27,691
WINNICUT ROAD
FairOver: WINNICUT RIVER
.31 MI. NW N. HAMPTON TL, Rockingham, NH
Built 1931 Load: 30.2 t ADT: 1,828
BUFFUMSVILLE RD
FairOver: SALMON FALLS RIVER
AT ME STATE LINE RD 60-5, Strafford, NH
Built 1982 Load: 30.2 t ADT: 1,688
COOPER STREET
FairOver: OTTER POND OUTLET
255FT. RTE.11, Sullivan, NH
Built 1920 Load: 30.2 t ADT: 238
NH 16
FairOver: CHOCORUA RIVER
3.6 MI FROM OSSIPEE TL, Carroll, NH
Built 1937 Load: 30.4 t ADT: 6,537
NH 25
FairOver: CONNECTICUT RIVER
VERMONT STATE LINE, Grafton, NH
Built 1929 Load: 30.4 t ADT: 2,356
I-93,US 4 SB
FairOver: MERRIMACK RIVER
1.5 MI N. JCT RT3, Merrimack, NH
Built 1959 Load: 30.4 t ADT: 25,221
I-93,US 4 NB
FairOver: MERRIMACK RIVER
1.5 MI N. JCT. RT.3, Merrimack, NH
Built 1959 Load: 30.4 t ADT: 25,274
NO DATA ENTERED
FairOver: TUNNEL STREAM SALE
NO DATA ENTERED, Grafton, NH
Built 2006 Load: 30.5 t ADT: 99
WINCHESTER STREET
FairOver: ASHUELOT RIVER
DOWNTOWN KEENE, Cheshire, NH
Built 1965 Load: 30.6 t ADT: 11,016
I-93 NB
FairOver: US 3,PEMIGEWASSET RIVER
2.6 MI PLYMOUTH T.L., Grafton, NH
Built 1969 Load: 30.6 t ADT: 9,864
I-93 SB
FairOver: US 3,PEMIGEWASSET RIVER
2.7 MI PLYMOUTH TL, Grafton, NH
Built 1969 Load: 30.6 t ADT: 9,903
TITUS ROAD
FairOver: MILL BROOK
7.7 MI LISBON T.L., Grafton, NH
Built 1927 Load: 30.6 t ADT: 78
CROSS ROAD
FairOver: ROCKY BRANCH
0.6 MI FR NO DORCHESTER, Grafton, NH
Built 2018 Load: 30.6 t ADT: 90
I-93 NB
FairOver: E BR PEMIGEWASSET RIVER
0.5 MI LINCOLN TL, Grafton, NH
Built 1972 Load: 30.6 t ADT: 7,054
I-89 SB
FairOver: NH 10
5.01 MI FROM SPRINGFIELD, Sullivan, NH
Built 1972 Load: 30.6 t ADT: 10,825
US302
FairOver: NHRR
4.2 MI.BARTLETT T.L., Carroll, NH
Built 1978 Load: 30.7 t ADT: 2,768
SANDWICH NOTCH RD
FairOver: ALGONQUIN BROOK
1.9 MI FR THORNTON TL, Carroll, NH
Built 1983 Load: 30.8 t ADT: 90
NH 12
FairOver: S BR ASHUELOT RIVER
0.7MI SWANZEY T.L., Cheshire, NH
Built 1962 Load: 30.8 t ADT: 8,843
I-93 NB
FairOver: NH 18,NH116
0.7 M N SUGARHILL TL, Grafton, NH
Built 1972 Load: 30.8 t ADT: 2,848
I-89 SB
FairOver: OTTERVILLE ROAD
4.4 MI FROM SUTTON TL, Merrimack, NH
Built 1967 Load: 30.8 t ADT: 9,263
I-89 NB
FairOver: COLUMBUS AVENUE
2.9 MI FROM SUTTON T.L., Merrimack, NH
Built 1967 Load: 30.8 t ADT: 9,607
OLD NH 10
FairOver: SKINNER BROOK
3.11 MI. N. OF CROYDON TL, Sullivan, NH
Built 1930 Load: 30.8 t ADT: 90
BUCK RD,OLD NH120
FairOver: MINK BROOK
BUCK RD @ MINK BROOK, Grafton, NH
Built 1936 Load: 30.9 t
NH 10
FairOver: MIREY BROOK
0.2 MI FROM JCT RTE 78, Cheshire, NH
Built 1940 Load: 31.0 t ADT: 8,782
US302
FairOver: AMMONOOSUC RIVER
3.5 MI. EAST INT US3, Coos, NH
Built 1974 Load: 31.0 t ADT: 4,613
NH 26
FairOver: MOHAWK RIVER
0.2 MI FROM JCT US 3, Coos, NH
Built 1973 Load: 31.0 t ADT: 2,779
I-89,NH 10 SB RAMP
FairOver: MASCOMA RIVER,ROAD-GATED
2.7 MI FROM VT S.L., Grafton, NH
Built 1966 Load: 31.0 t ADT: 4,564
I-93 SB
FairOver: AMMONOOSUC RIVER
2.1 MI BETHLEHEM TL, Grafton, NH
Built 1960 Load: 31.0 t ADT: 4,433
NH114
FairOver: PISCATAQUOG RIVER
GOFFSTOWN TL, Hillsborough, NH
Built 1972 Load: 31.0 t ADT: 9,162
RUSH ROAD
FairOver: AMEY BROOK
0.14 MI N JCT 202, Merrimack, NH
Built 1935 Load: 31.0 t ADT: 937
I-89 SB
FairOver: TRUCK ROAD,MASCOMA RIVER
5.9 MI ENFIELD TL, Grafton, NH
Built 1966 Load: 31.2 t ADT: 19,605
I-93 SB
FairOver: NH112,NHRR
0.27 NE LINCOLN TL, Grafton, NH
Built 1972 Load: 31.2 t ADT: 10,383
GRANITE STREET
FairOver: RECREATION TRAIL
0.42MI RTE 3, Hillsborough, NH
Built 1900 Load: 31.2 t ADT: 618
I-89 SB
FairOver: NH114
2.0MI NEW LONDON T.L., Merrimack, NH
Built 1967 Load: 31.2 t ADT: 9,249
I-93 SB
FairOver: NH104,NH132
1.05 MI N MERIDITH T.L., Belknap, NH
Built 1963 Load: 31.4 t ADT: 19,519
NH 12
FairOver: S BRANCH ASHUELOT RIVER
0.4MI FROM SWANZEY T.L., Cheshire, NH
Built 1962 Load: 31.4 t ADT: 8,843
NH 12
FairOver: S BR ASHUELOT RIVER
1.7MI FROM SWANZEY T.L., Cheshire, NH
Built 1962 Load: 31.4 t ADT: 8,843
I-93 NB
FairOver: STEVENS POND
0.1 MI N BRIDGE ST., Hillsborough, NH
Built 1977 Load: 31.4 t ADT: 36,111
Showing 801-850 of 2,542 bridges
Data sourced from the FHWA National Bridge Inventory (NBI), latest released cycle. See our methodology for details. Retrieved and formatted by PlainBridges Editorial.
Disclaimer: This information is provided for informational purposes only and does not constitute professional advice. Data is sourced from the FHWA National Bridge Inventory (NBI). A "structurally deficient" rating is a repair-priority signal, not a closure or unsafe-to-cross designation. Consult a qualified civil engineer before making decisions based on this data.
Understanding Bridge Conditions
How FHWA rates bridge condition on a 0-9 scale.
Check Your Daily Bridges
How to look up bridge condition data for bridges on your route.
Read our methodology — how this data is sourced, computed, and verified.
| Publisher | Kiznis Studio |
| Sources | FHWA National Bridge Inventory, public U.S. government datasets |