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
ACCESS ROAD
UnknownOver: I-93 NB OFF RAMP
2.6 M NORTH MANCHESTER TL, Merrimack, NH
Built 1978 ADT: 4,100
I-93 SB
UnknownOver: NH 3A
1.0 MI N MANCHESTER CL, Merrimack, NH
Built 1976 ADT: 22,000
I-93 NB
UnknownOver: NH 3A
1.0 MI N MANCHESTER CL, Merrimack, NH
Built 1976 ADT: 22,000
MAIN STREET
UnknownOver: MERRIMACK RIVER,CSX,RD
0.7 MI N JCT US 3, Merrimack, NH
Built 1976 ADT: 1,000
DONATI DRIVE
UnknownOver: I-93
0.1 MI MANCHESTER CL, Merrimack, NH
Built 1976 ADT: 64,968
I-93 SB
UnknownOver: US 3,NH 28
0.2 MI MANCHESTER TL, Merrimack, NH
Built 1976 ADT: 21,000
I-93 NB
UnknownOver: US 3,NH 28
0.2 MI MANCHESTER TL, Merrimack, NH
Built 1976 ADT: 21,000
US202,NH 9
UnknownOver: HATFIELD ROAD
.7 MI EAST HENNIKER T.L., Merrimack, NH
Built 1961 ADT: 300
I-89 SB
UnknownOver: PINE STREET
3.2 MI E. OF WARNER T.L., Merrimack, NH
Built 1959 ADT: 180
I-89 NB
UnknownOver: PINE STREET
3.2 MI EAST OF WARNER T.L, Merrimack, NH
Built 1967 ADT: 180
NH127
UnknownOver: I-89
1.9 MI N JCT US202, Merrimack, NH
Built 1994 ADT: 24,500
I-89(SB RAMP)
UnknownOver: US202,NH 9 EB
1.9 MI E JCT RT 127, Merrimack, NH
Built 1959 ADT: 3,000
I-89 SB
UnknownOver: US202,NH 9
1.9 MI S. OF JCT RT 127, Merrimack, NH
Built 1959 ADT: 2,000
I-89 NB
UnknownOver: US202,NH 9
1.9 SO JCT RT 127, Merrimack, NH
Built 1959 ADT: 2,000
I-89 SB
UnknownOver: US202,NH 9 WB
1.9 MI E. JCT RT 127, Merrimack, NH
Built 1959 ADT: 2,700
SOUTH ROAD
UnknownOver: I-89
.8 MI E OF JCT US 202, Merrimack, NH
Built 1959 ADT: 34,400
I-89 SB
UnknownOver: I-89 RAMP
2.0 MI WEST CONCORD TL, Merrimack, NH
Built 1959 ADT: 2,000
I-89 NB
UnknownOver: I-89 RAMP
2.1 MI WEST OF CONCORD TL, Merrimack, NH
Built 1959 ADT: 1,422
JEWETT ROAD
UnknownOver: I-89
1.8 MI E JCT 202, Merrimack, NH
Built 1959 ADT: 38,926
I-89 SB
UnknownOver: NH 11
3.9 MI FROM SUTTON T.L., Merrimack, NH
Built 1967 ADT: 5,000
I-89 NB
UnknownOver: NH 11
4.0 MI FROM SUTTON TL, Merrimack, NH
Built 1967 ADT: 5,200
I-89 NB
UnknownOver: COUNTY ROAD
2.2 MI FROM SUTTON T.L., Merrimack, NH
Built 1967 ADT: 1,300
COUNTY ROAD
UnknownOver: I-89 SB
2.2 MI FROM SUTTON TL, Merrimack, NH
Built 1967 ADT: 9,100
I-89 SB
UnknownOver: BOG ROAD
1.4 MI FROMSUTTON TL, Merrimack, NH
Built 1967 ADT: 100
I-89 SB
UnknownOver: KING HILL ROAD
.3 MI FROM SUTTON TL, Merrimack, NH
Built 1967 ADT: 5,000
I-89 NB
UnknownOver: KING HILL ROAD
0.3 MI FROM SUTTON TL, Merrimack, NH
Built 1967 ADT: 5,200
NH132
UnknownOver: I-93
0.5MI FROM CANTERBURY T.L, Merrimack, NH
Built 1959 ADT: 33,000
I-393,US 4,US202W
UnknownOver: NH 9
.5 MI E CONCORD TL, Merrimack, NH
Built 1988 ADT: 8,200
I-89 SB
UnknownOver: NORTH HOMINY POT RD
0.6MI FROM NEW LONDON TL., Merrimack, NH
Built 1967 ADT: 240
I-89 NB
UnknownOver: NORTH HOMINY POT RD
0.5MI FROM NEW LONDON TL, Merrimack, NH
Built 1967 ADT: 240
I-89 SB
UnknownOver: GILE POND ROAD
3.8MI NEW LONDON T.L., Merrimack, NH
Built 1967 ADT: 1,300
I-89 NB
UnknownOver: GILE POND ROAD
3.7MI NEW LONDON T.L., Merrimack, NH
Built 1967 ADT: 1,300
I-89 NB
UnknownOver: STEVENS BROOK ROAD
0.2MI WARNER T.L., Merrimack, NH
Built 1967 ADT: 40
I-89 SB
UnknownOver: STEVENS BROOK ROAD
0.2MI WARNER T.L., Merrimack, NH
Built 1967 ADT: 40
I-89 SB
UnknownOver: NH103
6.3 MI HOPKINTON TL, Merrimack, NH
Built 1968 ADT: 7,600
I-89 NB
UnknownOver: NH103
6.3 MI FROM HOPKINTON TL, Merrimack, NH
Built 1968 ADT: 7,600
I-89 NB
UnknownOver: NORTH VILLAGE ROAD
5.2 MI HOPKINTON T.L., Merrimack, NH
Built 1966 ADT: 740
I-89 SB
UnknownOver: NORTH VILLAGE ROAD
5.2 MI HOPKINTON T.L., Merrimack, NH
Built 1966 ADT: 740
I-89 NB
UnknownOver: WEST JOPPA ROAD
4.4 MI HOPKINTON T.L., Merrimack, NH
Built 1966 ADT: 100
I-89 SB
UnknownOver: WEST JOPPA ROAD
4.5 MI HOPKINTON TL, Merrimack, NH
Built 1966 ADT: 100
NH103
UnknownOver: I-89 NB
3.6 MI N. HOPKINTON T.L., Merrimack, NH
Built 1966 ADT: 9,500
NH103
UnknownOver: I-89 SB,WARNER RIVER
3.6 MI N HOPKINTON T.L., Merrimack, NH
Built 1966 ADT: 8,500
I-89 SB
UnknownOver: NH103
0.4 MI HOPKINTON T.L., Merrimack, NH
Built 1966 ADT: 1,700
I-89 NB
UnknownOver: NH103
0.5 MI HOPKINTON T.L., Merrimack, NH
Built 1966 ADT: 1,700
NH101 EB
UnknownOver: KING STREET
3.5 MI JCT RTE 28, Rockingham, NH
Built 1961 ADT: 300
NH101 WB
UnknownOver: KING STREET
3.5 MI JCT RT. 28, Rockingham, NH
Built 1961 ADT: 300
NH101 EB
UnknownOver: HOOKSETT ROAD
1.7 MI MANCHESTER TL, Rockingham, NH
Built 1972 ADT: 100
NH101 WB
UnknownOver: HOOKSETT ROAD
1.7 MI MANCHESTER TL, Rockingham, NH
Built 1972 ADT: 100
NH101
UnknownOver: TOWER HILL ROAD
2.6 MI JCT RT 28, Rockingham, NH
Built 1964 ADT: 200
NH101 EB
UnknownOver: PINE ROAD
.2 MI EAST OF EXETER TL, Rockingham, NH
Built 1997 ADT: 2,700
Showing 201-250 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 |