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
GARLAND ROAD
UnknownOver: NH 28
1.0 MI FROM PITTSFIELD TL, Belknap, NH
Built 1969 ADT: 11,000
NH 28
UnknownOver: BEAUTY HILL ROAD
1.3 MI FR PITTSFIELD T.L., Belknap, NH
Built 1969
US 3,NH 11
UnknownOver: US 3,NH 11
3.4 MI FROM LACONIA T.L., Belknap, NH
Built 1965 ADT: 14,000
MORRILL STREET
UnknownOver: US 3,NH 11 BYPASS
2.5 MI FROM LACONIA TL, Belknap, NH
Built 1965 ADT: 9,275
NH106
UnknownOver: US 3,NH 11
.4 MI BELMONT TL, Belknap, NH
Built 1964 ADT: 7,700
I-93 SB
UnknownOver: NH132
SANBORNTON T.L., Belknap, NH
Built 1963 ADT: 580
PINNACLE HILL ROAD
UnknownOver: I-93
1.1 MI MEREDITH TL, Belknap, NH
Built 1963 ADT: 25,000
I-93 NB
UnknownOver: NH104,NH132
1.1 MI MEREDITH TL, Belknap, NH
Built 1963 ADT: 8,900
I-93 NB
UnknownOver: NH132
5.2 MI MEREDITH TL, Belknap, NH
Built 1964 ADT: 1,400
US 3,NH 11,NH132
UnknownOver: I-93
.1 MI WINNIPESAUKEE RIVER, Belknap, NH
Built 2000 ADT: 27,326
NH 16
UnknownOver: NH 25
6.0 MI TAMWORTH T.L., Carroll, NH
Built 1969 ADT: 4,600
NH101
UnknownOver: GOLDMINE ROAD
0.6 MI PETERBOROUGH TL, Cheshire, NH
Built 1967 ADT: 380
NH 9,NH 10
UnknownOver: NH 12
NORTH JCT OF NH 9, 10 &12, Cheshire, NH
Built 1978 ADT: 15,000
COURT ST
UnknownOver: NH 9,NH 10
1.1 MI FROM KEENE CENTER, Cheshire, NH
Built 1977 ADT: 12,000
NH 9
UnknownOver: OLD NH 9,GRANITE LK OUT
1.1 MI E SULLIVAN TL, Cheshire, NH
Built 1994 ADT: 210
MURDOUGH HILL ROAD
UnknownOver: NH 9
1.6 MI EAST SULLIVAN TL, Cheshire, NH
Built 1994 ADT: 6,300
NORTH ASHLAND ROAD
UnknownOver: I-93
.3MI FROM HOLDERNESS, Grafton, NH
Built 1963 ADT: 17,000
I-93 SB
UnknownOver: US 3,NH 25
0.8 MI NEW HAMPTON T/L, Grafton, NH
Built 1963 ADT: 2,700
I-93 NB
UnknownOver: US 3, NH 25
0.8 MI FROM NEW HAMPTON T, Grafton, NH
Built 1963 ADT: 2,200
US302,NH 18,NH116
UnknownOver: I-93
2.1 MI SUGARHILL TL, Grafton, NH
Built 1959 ADT: 6,800
WEST FARM ROAD
UnknownOver: I-93
1.7 MI SUGARHILL TL, Grafton, NH
Built 1959 ADT: 6,200
EASTMAN HILL ROAD
UnknownOver: I-89,NH 10
0.2 MI LEBANON T.L., Grafton, NH
Built 1961 ADT: 21,200
I-89,NH 10 SB
UnknownOver: SMITH POND ROAD
2.2 MI FROM GRANTHAM T.L., Grafton, NH
Built 1959 ADT: 40
I-89,NH 10 NB
UnknownOver: SMITH POND ROAD
2.2 MI GRANTHAM T.L., Grafton, NH
Built 1959 ADT: 40
I-93 SB ON RAMP
UnknownOver: I-93
4.9 MI LINCOLN TL, Grafton, NH
Built 1959 ADT: 5,000
NH 18
UnknownOver: I-93 PARKWAY
3 MI.N LINCOLN TL, Grafton, NH
Built 1986 ADT: 8,400
I-89 SB OFF RAMP
UnknownOver: PLAZA CONNECTOR ROAD
SB OFF RAMP AT EXIT 20, Grafton, NH
Built 2012 ADT: 100
I-89 SB
UnknownOver: PLAZA CONNECTOR ROAD
0.4 MI EAST OF VT/NH LINE, Grafton, NH
Built 2012 ADT: 150
I-89 NB
UnknownOver: PLAZA CONNECTOR ROAD
0.4 MI EAST OF VT/NH LINE, Grafton, NH
Built 2012 ADT: 100
I-89 SB
UnknownOver: NH 12A
0.5 MI FROM VT S.L., Grafton, NH
Built 2012 ADT: 14,000
I-89 NB
UnknownOver: NH 12A
0.5 MI FROM VT. S.L., Grafton, NH
Built 2012 ADT: 14,000
POVERTY LANE
UnknownOver: I-89
2.3 MI FROM VT S.L., Grafton, NH
Built 1966 ADT: 35,900
I-89 NB
UnknownOver: US 4,NH 10
2.6 MI FROM VT SL, Grafton, NH
Built 1966 ADT: 14,000
I-89 SB
UnknownOver: US 4,NH 10
2.6 MI FROM VT S.L., Grafton, NH
Built 1966 ADT: 13,000
MASCOMA STREET
UnknownOver: I-89,NH 10
5.5 MI ENFIELD TL, Grafton, NH
Built 1966 ADT: 29,400
NH120
UnknownOver: I-89
.7MI FROM JCT RTE 4, Grafton, NH
Built 1966 ADT: 35,100
I-89 NB
UnknownOver: HEATER ROAD
0.6 MI FROM HARDY HILL RD, Grafton, NH
Built 1966 ADT: 2,300
I-89 SB
UnknownOver: MASCOMA R,RIVERSIDE DR
2.0MI FROM ENFIELD T.L., Grafton, NH
Built 1966 ADT: 1,700
I-89,NH 10 NB
UnknownOver: US 4
3.0 MI FROM ENFIELD T.L., Grafton, NH
Built 1966 ADT: 3,900
I-89,NH 10 SB
UnknownOver: US 4
1.9 MI FROM ENFIELD T.L., Grafton, NH
Built 1966 ADT: 4,800
I-89,NH 10 NB
UnknownOver: RIVERSIDE DR,MASCOMA RIV
2.0 MIFROM ENFIELD T.L., Grafton, NH
Built 1966 ADT: 1,500
I-93 SB
UnknownOver: US 3
1.74 MI N WOODSTOCK TL, Grafton, NH
Built 1973 ADT: 2,900
I-93 NB
UnknownOver: US 3
1.7 MI NORTH WOODSTOCK T, Grafton, NH
Built 1985 ADT: 2,900
HILLTOP ROAD
UnknownOver: I-93
0.24MI. FROM RD. #14, Grafton, NH
Built 1985 ADT: 6,800
NH135
UnknownOver: I-93
4 MI N OF BETHLEHEM TL, Grafton, NH
Built 1981 ADT: 6,900
US302,NH 10
UnknownOver: I-93
2.4 MI BETHLEHEM TL, Grafton, NH
Built 1960 ADT: 6,900
US 3
UnknownOver: US 3A, NH 25 WB
4.1 MI FROM RUMNEY TL, Grafton, NH
Built 1965 ADT: 10,000
I-93 SB
UnknownOver: I-93 NB RAMPS
0.4 MI FROM HOLDERNESS TL, Grafton, NH
Built 1964 ADT: 3,900
I-93 NB
UnknownOver: I-93 NB RAMPS
0.4 MI FR HOLDERNESS TL, Grafton, NH
Built 1964 ADT: 2,200
I-93 SB
UnknownOver: MIRROR LAKE ROAD
0.24 MI THORNTON TL, Grafton, NH
Built 1970 ADT: 100
Showing 1-50 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 |