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
NH101 WB
UnknownOver: BRIDGE STREET
1.2 MI W JCT RTE 28 BYP, Hillsborough, NH
Built 1961 ADT: 2,600
I-93 NB
UnknownOver: BRIDGE STREET
1.2 MI W JCT NH 28 BYP, Hillsborough, NH
Built 1977 ADT: 2,600
NH101 EB
UnknownOver: BRIDGE STREET
1.2 MI W. JCT RTE 28 BYP, Hillsborough, NH
Built 1961 ADT: 2,600
I-93 SB,NH101 WB
UnknownOver: HANOVER STREET
1.8MI W JCT RTE 28 A, Hillsborough, NH
Built 1960 ADT: 13,000
I-93 NB,NH101 EB
UnknownOver: HANOVER STREET
1.8 MI W JCT RTE 28 A, Hillsborough, NH
Built 1960 ADT: 13,000
I-93 SB,NH101 WB
UnknownOver: CANDIA ROAD
2.2 MI W JCT RT 28 BYPASS, Hillsborough, NH
Built 1960 ADT: 13,000
I-93 NB,NH101 EB
UnknownOver: CANDIA ROAD
2.2 MI W JCT RT 28 BYP, Hillsborough, NH
Built 1960 ADT: 13,000
I-293,FEE TPK
UnknownOver: I-293 NB ON RAMP
.6 MI BEDFORD TL, Hillsborough, NH
Built 2016 ADT: 5,123
US 3,NH 3A
UnknownOver: I-293,NH 3A,CSX,MERR R
0.7 MI BEDFORD TL, Hillsborough, NH
Built 1923 ADT: 61,000
I-293 NB OFF RAMP
UnknownOver: I-293,NH 3A,FEE TPK
1.5 E JCT RT 28, Hillsborough, NH
Built 2016 ADT: 61,000
ISLAND POND ROAD
UnknownOver: I-93 SB,I-293 WB
.6 MI E JCT RTE 28A, Hillsborough, NH
Built 2009 ADT: 53,000
ISLAND POND ROAD
UnknownOver: I-93 NB,I-293 EB
.6 MI E RT 28 A, Hillsborough, NH
Built 2009 ADT: 53,000
I-93 SB
UnknownOver: I-293 EBN
1.4 MI E JCT NH 28, Hillsborough, NH
Built 1961 ADT: 55,000
I-293 WB,NH101 WB
UnknownOver: NH 28A
1 MI E JCT RTE 28, Hillsborough, NH
Built 1961 ADT: 10,000
I-293 EB,NH101 EB
UnknownOver: NH 28A
1.0 MI E JCT RT 28, Hillsborough, NH
Built 1961 ADT: 10,000
I-93 NB OFF RAMP
UnknownOver: I-293 EB,NH101 EB
.1 MI E JCT RTE .3, Hillsborough, NH
Built 1961 ADT: 55,000
NH 28
UnknownOver: I-293,NH101
1.8 MI N LONDONDERRY TL, Hillsborough, NH
Built 1960 ADT: 87,000
HUSE ROAD
UnknownOver: I-293,NH101
1.3 MI E JCT RTE 28, Hillsborough, NH
Built 1960 ADT: 83,000
I-93 SB
UnknownOver: I-93 NB OFF RAMP
1.5 MI E JCT RT 28, Hillsborough, NH
Built 1962 ADT: 27,500
I-293 WB,NH101
UnknownOver: FRONTAGE RD,CSX(ABD)
0.6 MI E JCT RTE 3A, Hillsborough, NH
Built 1958 ADT: 10,000
I-293 EB,NH101
UnknownOver: FRONTAGE RD,CSX(ABD)
0.6MI E JCT RTE 3A, Hillsborough, NH
Built 1958 ADT: 10,000
I-293 WB,NH101
UnknownOver: NH 3A,BROWN AVE
1.2MI W JCT RTE 28, Hillsborough, NH
Built 2004 ADT: 8,500
I-93 SB
UnknownOver: BODWELL ROAD
3.2 MI S.W JCT RT 28, Hillsborough, NH
Built 1962 ADT: 4,400
I-93 NB
UnknownOver: BODWELL ROAD
3.2 MI SW JCT RT28, Hillsborough, NH
Built 1962 ADT: 4,400
I-293 EB,NH101
UnknownOver: NH 3A,BROWN AVE
1.2MI W. JCT RTE 28, Hillsborough, NH
Built 2004 ADT: 8,500
BABOOSIC LAKE ROAD
UnknownOver: FEE TPK
.8 MI FROM SOUHEGAN R, Hillsborough, NH
Built 1954 ADT: 68,000
INDUSTRIAL DRIVE
UnknownOver: FEE TPK
1.0 MI.FR. NASHUA T/L, Hillsborough, NH
Built 1990 ADT: 68,000
FEE TPK
UnknownOver: GREELEY STREET
AT MERRIMACK INTERCHANGE, Hillsborough, NH
Built 1993 ADT: 16,000
WIRE ROAD
UnknownOver: FEE TPK
0.5 MI BABOOSIC ROAD, Hillsborough, NH
Built 1954 ADT: 69,000
BEDFORD ROAD
UnknownOver: FEE TPK
1.8 MI BEDFORD T.L., Hillsborough, NH
Built 1990 ADT: 69,000
NH101
UnknownOver: OSGOOD ROAD
1.0 MI W JCT NH 13., Hillsborough, NH
Built 1977 ADT: 4,000
NH101
UnknownOver: NH 13
1 MI S MILFORD VILLAGE, Hillsborough, NH
Built 1976 ADT: 5,000
NH101
UnknownOver: PONEMAH HILL ROAD
0.8 M W AMHERST T.L., Hillsborough, NH
Built 1971 ADT: 1,000
NH101
UnknownOver: NH101A,CSX
0.2 MI W. AMHERST T.L., Hillsborough, NH
Built 1971 ADT: 30,504
TINKER ROAD
UnknownOver: FEE TPK
0.9 MI S MERRIMACK T/L, Hillsborough, NH
Built 1987 ADT: 111,000
NH130,BROAD STREET
UnknownOver: US 3,FEE TPK
.2 MI FROM COLISEUM AVE, Hillsborough, NH
Built 1999 ADT: 124,280
NH101A BP,SOMERSET
UnknownOver: FEE TPK
1.3 MI FR MERRIMACK TL, Hillsborough, NH
Built 1989 ADT: 111,000
NH101A
UnknownOver: FEE TPK
0.01 MI CYPRESS LANE, Hillsborough, NH
Built 1999 ADT: 91,000
PINE HILL ROAD
UnknownOver: US 3,FEE TPK
.2 MI FROM NH 130, Hillsborough, NH
Built 1994 ADT: 111,000
NH111
UnknownOver: US 3,FEE TPK
0.02 MI FROM NH111-A, Hillsborough, NH
Built 1998 ADT: 106,000
BALDWIN STREET
UnknownOver: BROAD ST PKWY,CSX
0.18 MI FR FAIRMONT ST, Hillsborough, NH
Built 2014 ADT: 19,000
FAIRMOUNT STREET
UnknownOver: BROAD ST PKWY,CSX
60 FT FROM FIFIELD LANE, Hillsborough, NH
Built 2015 ADT: 19,000
EAST DUNSTABLE RD
UnknownOver: FEE TPK,RAMP 4CD
0.01 MI FROM SALMON BK, Hillsborough, NH
Built 1996 ADT: 106,000
WATER STREET
UnknownOver: FACTORY ACCESS ROAD
0.13 MI FR MAIN ST, Hillsborough, NH
Built 1962 ADT: 5,200
FEE TPK NB,RAMP 4
UnknownOver: RAMP 3B
.02 MI FROM ROBINSON RD, Hillsborough, NH
Built 1997 ADT: 5,000
DANIEL WEBSTER HWY
UnknownOver: US 3,FEE TPK NB RAMP
0.02 MI FROM ROBINSON RD, Hillsborough, NH
Built 1955 ADT: 11,000
FEE TPK SB ON RAMP
UnknownOver: FEE TPK SB OFF RAMP
1 MI N MASS SL, Hillsborough, NH
Built 1995 ADT: 6,000
FEE TPK SB,RAMP
UnknownOver: FEE TPK SB OFF RAMPS
1.2 MI N MASS SL, Hillsborough, NH
Built 1996 ADT: 11,444
US 3,FEE TPK SB
UnknownOver: SPIT BROOK ROAD
.5 MI FROM MASS S.L., Hillsborough, NH
Built 1995 ADT: 24,000
FEE TPK NB,ON RAMP
UnknownOver: FEE TPK SB OFF RAMPS
1.2 MI N MASS SL, Hillsborough, NH
Built 1996 ADT: 11,444
Showing 101-150 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 |