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

BROOK ROAD

Fair

Over: GUNNISON BROOK

.05 MI NE OF JCT NH 10, Sullivan, NH

Built 1940 Load: 56.7 t ADT: 991

KELLYS CORNER ROAD

Fair

Over: SANBORN BROOK

0.5MI. NH28, Merrimack, NH

Built 1991 Load: 57.5 t ADT: 466

US302

Fair

Over: SACO RIVER

4.4 MI CARROLL TL, Carroll, NH

Built 1949 Load: 57.6 t ADT: 2,100

NH 16

Fair

Over: PINE RIVER

2.4 MI FROM WAKEFIELD TL, Carroll, NH

Built 1930 Load: 58.1 t ADT: 7,426

TUCKER MILL ROAD

Fair

Over: MID BR PISCATAQUOG RIVER

1.0 MI FR WEARE TL, Hillsborough, NH

Built 1991 Load: 58.2 t ADT: 90

NH125

Fair

Over: LYMAN BROOK

1.0 MI ROCHESTER TL, Strafford, NH

Built 1935 Load: 58.6 t ADT: 5,502

NH132

Fair

Over: SQUAM RIVER

0.9 MI N NEW HAMPTON TL, Grafton, NH

Built 1905 Load: 59.0 t ADT: 3,436

NH123

Fair

Over: CONNECTICUT RIVER

VERMONT STATE LINE, Cheshire, NH

Built 1910 Load: 59.1 t ADT: 8,300

NH 11A

Fair

Over: GUNSTOCK RIVER

3.2 MI E LACONIA TL, Belknap, NH

Built 1926 Load: 61.1 t ADT: 4,490

NH 16

Fair

Over: NINETEEN MILE BROOK

1.4MI PINKHAMS GRANT TL, Coos, NH

Built 1954 Load: 61.2 t ADT: 3,317

I-89 NB

Fair

Over: STOCKER BROOK

0.81 MI SPRINGFIELD TL, Sullivan, NH

Built 1967 Load: 61.7 t ADT: 9,340

NH 11

Fair

Over: SUGAR RIVER

4.0 MI NEW LONDON TL, Sullivan, NH

Built 1957 Load: 61.7 t ADT: 7,439

I-93 SB

Fair

Over: NH 18,NH116

0.3 MI SUGARHILL TL, Grafton, NH

Built 1959 Load: 62.6 t ADT: 2,593

COTE ROAD

Fair

Over: CROYDON BRANCH

0.09MI. RTE 10, Sullivan, NH

Built 1991 Load: 62.6 t ADT: 90

NH 31,NH101

Fair

Over: SOUHEGAN RIVER

1.4 MI FROM MILFORD TL, Hillsborough, NH

Built 1954 Load: 63.7 t ADT: 12,288

CROSS STREET

Fair

Over: SUGAR RIVER

0.12 MI FR SUNAPEE ST, Sullivan, NH

Built 1983 Load: 64.0 t ADT: 2,533

US 3,NH 28

Fair

Over: HEADS POND

0.7 MI S OF ALLENSTOWN TL, Merrimack, NH

Built 1981 Load: 64.3 t ADT: 16,108

NH 9,NH 10

Fair

Over: ELM STREET

0.8 MI EAST OF JCT 12, Cheshire, NH

Built 1978 Load: 65.0 t ADT: 10,654

I-93 SB

Fair

Over: COHAS BROOK

1.5 MI E JCT RT 28, Hillsborough, NH

Built 1962 Load: 65.0 t ADT: 25,680

I-89(RAMP A)

Fair

Over: TURKEY RIVER

BOW INTERCHANGE, Merrimack, NH

Built 1959 Load: 68.0 t ADT: 19,907

US202,NH 11

Fair

Over: SALMON FALLS RIVER

MAINE SL, Strafford, NH

Built 1945 Load: 68.0 t ADT: 12,790

SECOND NH TPK

Fair

Over: BROOK

1.0 MI FR ANTRIM TL, Hillsborough, NH

Built 1900 Load: 68.1 t ADT: 710

NH107A

Fair

Over: CSX, ROAD

0.6 MI KINGSTON TL, Rockingham, NH

Built 1937 Load: 69.7 t ADT: 2,010

US 2

Fair

Over: SNYDER BROOK

5.1 MI FROM JEFFERSON TL, Coos, NH

Built 1966 Load: 70.8 t ADT: 5,144

NH 10,NH 11,NH103

Fair

Over: SUGAR RIVER

5.4MI FROM CLAREMONT TL, Sullivan, NH

Built 1930 Load: 70.8 t ADT: 11,168

I-89,NH 10 SB

Fair

Over: I-89 RAMP

0.1 MI ENFIELD TL, Sullivan, NH

Built 1959 Load: 72.2 t ADT: 10,825

NH101

Fair

Over: MUD POND

1.8 MI NW PETERBOROUGH TL, Cheshire, NH

Built 1966 Load: 74.1 t ADT: 6,746

US302

Fair

Over: WILLEY BROOK

1.3 MI SE FROM CARROLL TL, Carroll, NH

Built 1978 Load: 74.5 t ADT: 2,691

I-93 NB

Fair

Over: SALMON BROOK

3.4 MI TILTON TL, Belknap, NH

Built 1962 Load: 74.8 t ADT: 14,051

WALKER STREET

Fair

Over: PISCATAQUA R BACK CHAN

200 M SE OF SR103, Rockingham, NH

Built 1913 Load: 74.8 t ADT: 7,000

NH 16,SP TPK

Fair

Over: BLACKWATER ROAD

.6 MI FROM DOVER T.L., Strafford, NH

Built 1957 Load: 75.6 t ADT: 29,795

NO DATA ENTERED

Fair

Over: TUNNEL STREAM SALE

NO DATA ENTERED, Grafton, NH

Built 2006 Load: 77.1 t ADT: 99

NH119

Fair

Over: CONVERSEVILLE BROOK

3.5 MI TO MASS SL, Cheshire, NH

Built 1966 Load: 77.7 t ADT: 4,307

NH112

Fair

Over: DOWNES BROOK

0.1 MI FROM WATERVILLE, Carroll, NH

Built 1963 Load: 79.0 t ADT: 3,016

NH 16

Fair

Over: PEABODY RIVER

2.3 MI JACKSON TL, Coos, NH

Built 1960 Load: 79.8 t ADT: 3,317

HIGH STREET

Fair

Over: SUGAR RIVER

0.3 MI. RTE.103B, Sullivan, NH

Built 1920 Load: 80.0 t ADT: 614

BROOK ROAD

Fair

Over: JOE ENGLISH BROOK

1.4 MI FR DODGE/AUSTIN R, Hillsborough, NH

Built 1985 Load: 83.1 t ADT: 187

I-93 SB

Fair

Over: SALMON BROOK

3.3MI F. TILTON T.L., Belknap, NH

Built 1962 Load: 83.5 t ADT: 14,007

US 2

Fair

Over: COLD BROOK

4.5 MI FROM JEFFERSON TL, Coos, NH

Built 1966 Load: 88.9 t ADT: 5,144

I-89,NH 10 NB

Fair

Over: MILLER POND ROAD

4.6 MI FROM SPRINGFIELD T, Sullivan, NH

Built 1959 Load: 89.2 t ADT: 10,644

US 3

Fair

Over: PAUGUS BAY

7.4 MI FROM BELMONT TL, Belknap, NH

Built 1933 Load: 89.8 t ADT: 13,478

NH 25

Fair

Over: STONY BROOK

5.4 MI FROM OSSIPEE TL, Carroll, NH

Built 1986 Load: 89.8 t ADT: 3,737

NH 12A,NH123

Fair

Over: COLD RIVER

0.7 MI. FROM LANGDON TL, Cheshire, NH

Built 2009 Load: 89.8 t ADT: 1,416

NH 9

Fair

Over: ISLAND POND OUTLET

2.2 MI. W. ANTRIM TL, Cheshire, NH

Built 1964 Load: 89.8 t ADT: 6,137

NH 12

Fair

Over: TROY BROOK

0.4 MI N TO KEENE T.L., Cheshire, NH

Built 1970 Load: 89.8 t ADT: 12,962

MT CLINTON ROAD

Fair

Over: SOKOKIS BROOK

3.57 MI NE JCT 302, Coos, NH

Built 1934 Load: 89.8 t ADT: 101

US 2

Fair

Over: STAG HOLLOW BROOK

2.5 MI FROM RANDOLPH TL, Coos, NH

Built 1969 Load: 89.8 t ADT: 4,701

I-93

Fair

Over: BLACK BROOK

2.8 MI SUGARHILL TL, Grafton, NH

Built 1959 Load: 89.8 t ADT: 5,172

NH120

Fair

Over: MINK BROOK

.3 MI. FROM LEBANON TL, Grafton, NH

Built 1969 Load: 89.8 t ADT: 9,838

I-93 PARKWAY

Fair

Over: WALKER BROOK

7.3 MI N WOODSTOCK T.L., Grafton, NH

Built 1985 Load: 89.8 t ADT: 11,427

Showing 1,201-1,250 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.