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

NH127

Fair

Over: TAIL RACE

1.1 MILE N JCT US202,NH 9, Merrimack, NH

Built 1900 Load: 31.4 t ADT: 3,357

DUNDEE ROAD

Fair

Over: GREAT BROOK

3.4 MI BARTLETT T.L., Carroll, NH

Built 1930 Load: 31.5 t ADT: 214

KEARSARGE WAY

Fair

Over: CSX

0.3 MI JCT MARKET ST, Rockingham, NH

Built 1979 Load: 31.5 t ADT: 504

US302

Fair

Over: SACO RIVER

1.0 MI FROM CARROLL TL, Carroll, NH

Built 1978 Load: 31.7 t ADT: 2,691

OLD NH 9

Fair

Over: GRANITE LAKE OUTLET

0.7 MI FROM STODDARD TL, Cheshire, NH

Built 1932 Load: 31.7 t ADT: 483

I-93 SB

Fair

Over: STEVENS POND

0.1 MI N BRIDGE ST., Hillsborough, NH

Built 1977 Load: 31.7 t ADT: 47,209

CAUSEWAY

Fair

Over: JOE ENGLISH POND

0.2 MILES FROM ON-ORBIT D, Hillsborough, NH

Built 2008 Load: 31.7 t ADT: 10

I-93 SB,US 4 RAMP

Fair

Over: NHRR

0.1 MI S. CANTERBURY T/L, Merrimack, NH

Built 1958 Load: 31.7 t ADT: 6,743

FOWLERS MILL ROAD

Fair

Over: PAUGUS BROOK

1.2 MI. RTE. 113A, Carroll, NH

Built 1991 Load: 31.8 t ADT: 90

I-89,NH 10 SB

Fair

Over: HEATER ROAD

0.6 MI FROM HARDY HILL RD, Grafton, NH

Built 1966 Load: 31.8 t ADT: 16,350

NH114

Fair

Over: WARNER RIVER

3.8 MI FROM WARNER TL, Merrimack, NH

Built 1948 Load: 31.8 t ADT: 4,461

NH106

Fair

Over: SHAKER BROOK

4.0 MI N CONCORD TL, Merrimack, NH

Built 1951 Load: 31.8 t ADT: 12,671

NH 16,SP TPK

Fair

Over: CROSS ROAD

1.4 MI S OF MILTON TL, Strafford, NH

Built 1978 Load: 31.8 t ADT: 16,271

NH120

Fair

Over: BLOODS BROOK

4.2 MI FROM LEBANON TL, Sullivan, NH

Built 1934 Load: 31.8 t ADT: 2,667

NH 16,SP TPK

Fair

Over: NHNCRR

5.7 MI N OF ROCHESTER TL, Strafford, NH

Built 1980 Load: 32.0 t ADT: 14,303

NH 75

Fair

Over: NHNCRR

2.7 MI N OF FARMINGTON TL, Strafford, NH

Built 1978 Load: 32.0 t ADT: 3,653

NH202A

Fair

Over: COCHECO RIVER

1.2 MI FROM JCT RT 16, Strafford, NH

Built 1883 Load: 32.0 t ADT: 13,798

NH 12,NH103

Fair

Over: CONNECTICUT RIVER

NH VT SL, Sullivan, NH

Built 1969 Load: 32.0 t ADT: 9,157

NH 11,NH103

Fair

Over: SUGAR RIVER

4.4 MI FROM VERMONT SL, Sullivan, NH

Built 1981 Load: 32.0 t ADT: 17,536

I-93 NB

Fair

Over: COAL HILL RD,GALE RIVER

1.9MI SUGARHILL TL, Grafton, NH

Built 1973 Load: 32.3 t ADT: 2,573

I-93 SB

Fair

Over: PEMIGEWASSET RIVER

1.84 MI THORNTON TL, Grafton, NH

Built 1970 Load: 32.3 t ADT: 7,060

I-93 NB

Fair

Over: PEMIGEWASSET RIVER

1.84 MI THORNTON TL, Grafton, NH

Built 1970 Load: 32.3 t ADT: 6,913

US202,NH 9

Fair

Over: CONTOOCOOK RIVER

0.2 MI EAST HENNIKER T/L, Merrimack, NH

Built 1961 Load: 32.3 t ADT: 16,732

MILL BROOK ROAD

Fair

Over: MILL BROOK

2.52 MI S. JCT 302, Grafton, NH

Built 1928 Load: 32.5 t ADT: 111

I-93 NB

Fair

Over: PEMIGEWASSET RIVER

HOLDERNESS-PLYMOUTH TL, Grafton, NH

Built 1964 Load: 32.5 t ADT: 11,292

NH 16,SP TPK

Fair

Over: TENERIFFE ROAD

4.6 MI N OF ROCHESTER TL, Strafford, NH

Built 1980 Load: 32.5 t ADT: 14,303

NH 28

Fair

Over: SUNCOOK RIVER

3.6 MI FROM PITTSFIELD TL, Belknap, NH

Built 1957 Load: 32.7 t ADT: 8,422

NH140

Fair

Over: TIOGA RIVER

2.8 MI FROM NORTHFIELD TL, Belknap, NH

Built 1965 Load: 32.7 t ADT: 7,403

HENDERSON ROAD

Fair

Over: GUNSTOCK RIVER

0.09 MI FR INTERVALE RD, Belknap, NH

Built 1960 Load: 32.7 t ADT: 479

US 3,NH 11

Fair

Over: NH 11A

0.7 MI FROM LACONIA TL, Belknap, NH

Built 1965 Load: 32.7 t ADT: 9,365

I-93 SB

Fair

Over: OLD NH 3B

TILTON-SANBORTON TL, Belknap, NH

Built 1962 Load: 32.7 t ADT: 14,004

I-93 NB

Fair

Over: OLD NH 3B

.09 MI TILTON T.L., Belknap, NH

Built 1962 Load: 32.7 t ADT: 13,995

RIVER STREET

Fair

Over: SACO RIVER

0.05 MI FR COBB RD, Carroll, NH

Built 1967 Load: 32.7 t ADT: 444

NH113B

Fair

Over: MCDONOUGH BROOK

7.27 MI N. CONWAY T.L., Carroll, NH

Built 1953 Load: 32.7 t ADT: 139

NH 16,NH113

Fair

Over: PEQUAWKET POND

1.2 MI FROM ALBANY TL, Carroll, NH

Built 1940 Load: 32.7 t ADT: 13,581

ELM STREET

Fair

Over: PINE RIVER

1.55 MI. OSSIPEE TL, Carroll, NH

Built 1983 Load: 32.7 t ADT: 1,011

MAIN STREET

Fair

Over: SWIFT RIVER

0.09 MI FROM NH RTE 113, Carroll, NH

Built 1973 Load: 32.7 t ADT: 800

HAMMOND HOLLOW RD

Fair

Over: ASHUELOT RIVER

TOWN RD, Cheshire, NH

Built 1981 Load: 32.7 t ADT: 135

DEPOT ROAD

Fair

Over: ASHUELOT RIVER

0.1 MI. S OF RT. 119 JCT., Cheshire, NH

Built 1978 Load: 32.7 t ADT: 312

JOSLIN ROAD

Fair

Over: MERRIAM BROOK

TOWN RD, Cheshire, NH

Built 2012 Load: 32.7 t ADT: 90

NH 12

Fair

Over: S BRANCH ASHUELOT RIVER

2.2MI TO TROY CENTER, Cheshire, NH

Built 1983 Load: 32.7 t ADT: 8,843

MAKINEN ROAD

Fair

Over: MILL BROOK

0.09MI NH 12, Cheshire, NH

Built 2015 Load: 32.7 t ADT: 90

PLEASANT STREET

Fair

Over: MOHAWK RIVER

280 FEET FR US RTE 3, Coos, NH

Built 1972 Load: 32.7 t ADT: 989

US 2

Fair

Over: ISRAEL RIVER

0.4 MI E LANCASTER TL, Coos, NH

Built 1974 Load: 32.7 t ADT: 2,443

US 3

Fair

Over: SL&ARR

2.2 MI FROM STRATFORD TL, Coos, NH

Built 1959 Load: 32.7 t ADT: 2,993

NORTH ROAD

Fair

Over: MILL BROOK

3.2 MI JCT US 2, Coos, NH

Built 1962 Load: 32.7 t ADT: 90

BROOK ROAD

Fair

Over: BROCK BROOK

0.5 MI FR SHEM VALLEY RD, Grafton, NH

Built 1930 Load: 32.7 t ADT: 74

TRANSFER STATION R

Fair

Over: ORANGE BROOK

0.4 mi SOUTH ORANGE RD, Grafton, NH

Built 1980 Load: 32.7 t ADT: 90

HEARSE HOUSE ROAD

Fair

Over: S BRANCH BAKER RIVER

1.7 MI WENTWORTH TL, Grafton, NH

Built 1970 Load: 32.7 t ADT: 90

TOWN ROAD

Fair

Over: MINK BROOK

50 FT FR HANOVER CTR RD, Grafton, NH

Built 1980 Load: 32.7 t ADT: 90

Showing 851-900 of 2,542 bridges

Related

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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.