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

Total Bridges

2,542

Public highway bridges in New Hampshire

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 Hampshire42.95830055074744%35.641227380015735%GoodFairPoorStructurally Deficient
Bridge inventory deck-condition mix — New Hampshire (FHWA NBI)

Counties (10)

Belknap 112 Carroll 193 Cheshire 192 Coos 188 Grafton 544 Hillsborough 385 Merrimack 326 Rockingham 308 Strafford 136 Sullivan 158

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
Structure
Progressive
Burden @ $100K
$19,132

21

Kentucky

7.06% top marginal rate
Structure
Progressive
Burden @ $100K
$14,554
Selected

33

New Hampshire

7.08% top marginal rate
Structure
Progressive
Burden @ $100K
$2,542

40

Oklahoma

7.50% top marginal rate
Structure
Progressive
Burden @ $100K
$22,733

35

New Mexico

7.61% top marginal rate
Structure
Progressive
Burden @ $100K
$368

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

Poor

Over: BROOK

185 FT FROM NH RTE 43, Rockingham, NH

Built 1920 Load: 1.8 t ADT: 190

TEMPLETON TURNPIKE

Structurally Deficient

Over: PRIEST BROOK

1.9MI. RTE 119, Cheshire, NH

Built 1984 Load: 2.7 t ADT: 86

DUDLEY ROAD

Structurally Deficient

Over: LAMPREY RIVER

.23 MI JCT 101, Rockingham, NH

Built 1914 Load: 2.9 t ADT: 535

SHOP ROAD

Structurally Deficient

Over: NEEDLE SHOP BROOK

0.8 MI N NEW CHESTER RD, Merrimack, NH

Built 1930 Load: 3.3 t ADT: 63

WHITCOMB MILLS RD

Poor

Over: WHITE BROOK

0.06 MI FR ARCH ST, Cheshire, NH

Built 1940 Load: 3.6 t ADT: 814

LEIGHTON MEADOW RD

Structurally Deficient

Over: PHILLIPS BROOK

100 FT FR SULLIVAN RD 61, Coos, NH

Built 1940 Load: 3.6 t ADT: 90

All Bridges in New Hampshire

I-95 SB CONNECTOR

Unknown

Over: I-95 NB

SP TPK,I-95 INTERCHANGE, Rockingham, NH

Built 1972 ADT: 89,900

I-95 SB

Unknown

Over: NB RAMP

SP TPK,I-95 INTERCHANGE, Rockingham, NH

Built 1972 ADT: 9,000

ISLINGTON STREET

Unknown

Over: US 1 BYPASS

1.0 MI FROM JCT US 1, Rockingham, NH

Built 2015 ADT: 21,000

ASHLAND ROAD

Unknown

Over: I-95 RAMPS

AUX. ENTRANCE TO PAFB, Rockingham, NH

Built 1972 ADT: 20,000

I-95 NB

Unknown

Over: US 4,NH 16,SP TPK

I-95,SP TPK INTERCHANGE, Rockingham, NH

Built 1971 ADT: 31,000

I-95 SB

Unknown

Over: US 4,NH 16,SP TPK

I-95,SP TPK INTERCHANGE, Rockingham, NH

Built 1970 ADT: 31,000

US 4,NH 16,SP TPK

Unknown

Over: NB RAMP

N SP TPK I-95 INTERCHANGE, Rockingham, NH

Built 1971 ADT: 14,000

WOODBURY AVENUE

Unknown

Over: US 1 BYPASS

0.6 MI FROM MAINE SL, Rockingham, NH

Built 2020 ADT: 11,000

STARK STREET

Unknown

Over: US 1 BYPASS

0.2 MI FROM JCT NH 16, Rockingham, NH

Built 2019 ADT: 14,000

I-95

Unknown

Over: MAPLEWOOD AVENUE

.6 MI FROM JCT NH 16, Rockingham, NH

Built 1970 ADT: 1,300

MAPLEWOOD AVENUE

Unknown

Over: US 1 BYPASS

.8 MI FROM JCT NH 16, Rockingham, NH

Built 2015 ADT: 14,000

US 1,SCOTT AVENUE

Unknown

Over: DANIEL STREET

0.1 MI SOUTH MAINE-NH SL, Rockingham, NH

Built 1921 ADT: 4,400

GREEN ROAD

Unknown

Over: NH101

1.3 MI E OF CANDIA TL, Rockingham, NH

Built 1982 ADT: 20,383

OLD MANCHESTER RD

Unknown

Over: NH101

3.2MI E OF CANDIA TL, Rockingham, NH

Built 1984 ADT: 41,000

NH101 EB

Unknown

Over: NH107

4.7MI EAST OF CANDIA TL, Rockingham, NH

Built 1983 ADT: 13,000

NH101 WB

Unknown

Over: NH107

4.7MI EAST OF CANDIA TL, Rockingham, NH

Built 1983 ADT: 13,000

PRESCOTT ROAD

Unknown

Over: NH101

.2 MI WEST EPPING TL, Rockingham, NH

Built 1985 ADT: 44,000

BROOKDALE ROAD

Unknown

Over: I-93

4 MI S WINDHAM TL, Rockingham, NH

Built 2012 ADT: 80,000

I-93 SB

Unknown

Over: PELHAM ROAD

1.1 M N OF JCT RT 38, Rockingham, NH

Built 2014 ADT: 12,000

I-93 NB

Unknown

Over: PELHAM ROAD

1.1 M N OF JCT 38, Rockingham, NH

Built 2014 ADT: 12,000

I-93 SB

Unknown

Over: NH 38

2.0 ML N. OF MASS SL., Rockingham, NH

Built 2013 ADT: 12,000

I-93 NB

Unknown

Over: NH 38

2.0 MI N. OF NH/MA LINE, Rockingham, NH

Built 2013 ADT: 12,000

I-93 ON RAMPS

Unknown

Over: SOUTH POLICY STREET

0.25MI S. OF JCT RT 38, Rockingham, NH

Built 1960 ADT: 10,000

I-93 SB RAMPS

Unknown

Over: I-93 SB

0.2 MI S OF JCT NH 38, Rockingham, NH

Built 2008 ADT: 40,500

I-93 SB RAMPS

Unknown

Over: I-93 NB

.2 MI S OF JCT NH 38, Rockingham, NH

Built 2008 ADT: 40,500

I-93 SB OFF RAMP

Unknown

Over: SOUTH POLICY STREET

0.25MI S. OF JCT RT 38, Rockingham, NH

Built 1965 ADT: 10,000

I-93 NB OFF RAMP

Unknown

Over: SOUTH POLICY STREET

0.25MI S. OF JCT RT 38, Rockingham, NH

Built 1961 ADT: 10,000

ROCKNHAM MALL ENTR

Unknown

Over: ROCKHAM BLVD,BK,PARKNLOT

ROCKINGHAM MALL, Rockingham, NH

Built 1991 ADT: 31,400

CROSS STREET

Unknown

Over: I-93

1.2 MI N OF MASS SL, Rockingham, NH

Built 2007 ADT: 100,925

NH107

Unknown

Over: I-95

.8 MI N OF MASS SL, Rockingham, NH

Built 1967 ADT: 92,380

NH101 EB

Unknown

Over: NH108

.4 MI FROM EXETER TL, Rockingham, NH

Built 1999 ADT: 21,000

NH101 WB

Unknown

Over: NH108

STRATHAM, Rockingham, NH

Built 2000 ADT: 23,000

I-93 SB

Unknown

Over: NORTH LOWELL ROAD

0.6 MI SOUTH DERRY TL, Rockingham, NH

Built 1995 ADT: 5,000

I-93 NB

Unknown

Over: NORTH LOWELL ROAD

.6 MI S OF DERRY TL, Rockingham, NH

Built 1998 ADT: 5,000

I-93 SB

Unknown

Over: NH111A

.7/10 OF MIL WEST NH 111, Rockingham, NH

Built 2014 ADT: 9,100

I-93 NB

Unknown

Over: NH111A

.2 M EAST OF ARMSTRONG RD, Rockingham, NH

Built 2011 ADT: 4,000

I-93 SB

Unknown

Over: NH111

3 MI SOUTH OF DERRY TL, Rockingham, NH

Built 2014 ADT: 21,000

I-93 NB

Unknown

Over: NH111

0.2 EAST OF WYMAN ROAD, Rockingham, NH

Built 2011 ADT: 21,000

NH111

Unknown

Over: HARRIS RD,FLATROCK BK

0.5MI EAST NH 28, Rockingham, NH

Built 2007 ADT: 100

INDIAN BROOK DRIVE

Unknown

Over: NH 16,SP TPK

1.8 MI FROM ROCHESTER TL, Strafford, NH

Built 1957 ADT: 43,500

GLENWOOD AVENUE

Unknown

Over: NH 16,SP TPK

.7 MI. FROM JCT. 16, Strafford, NH

Built 1957 ADT: 43,500

SIXTH STREET

Unknown

Over: NH 16,SP TPK

1.2 MI. FROM JCT. 16, Strafford, NH

Built 1957 ADT: 43,500

TOLEND ROAD

Unknown

Over: NH 16,SP TPK

1.4 MI FROM JCT. 16, Strafford, NH

Built 1957 ADT: 43,500

NH 9, SILVER ST

Unknown

Over: NH 16,SP TPK

0.3 MI. FROM JCT NH155, Strafford, NH

Built 1957 ADT: 41,600

CATARACT AVENUE

Unknown

Over: NH 16,SP TPK

.3 MI FROM JCT. RT 16, Strafford, NH

Built 1957 ADT: 41,600

GERRISH ROAD

Unknown

Over: NH 16,SP TPK

0.1 MI FROM JCT. 16, Strafford, NH

Built 1956 ADT: 39,097

BAGDAD ROAD

Unknown

Over: US 4

.4 MI. FROM JCT. NH 108, Strafford, NH

Built 1966 ADT: 15,000

US 4

Unknown

Over: NH155

1.0 MI FROM JCT RT 155A, Strafford, NH

Built 1968 ADT: 6,100

NH125(RAMP D)

Unknown

Over: US202,NH 11 WB(RAMP A)

.7 MI FROM JCT NH 16, Strafford, NH

Built 1966 ADT: 5,300

US202,NH 11

Unknown

Over: NH125

NH 16 INTERCHANGE, Strafford, NH

Built 1957 ADT: 9,500

Showing 301-350 of 2,542 bridges

Related

All states → | National rankings → | Understanding conditions → | SD bridges explained →
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.