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

COAKLEY ROAD

Poor

Over: HODGSON BROOK

1 MI. WEST OF BYPASS 1, Rockingham, NH

Built 1940 Load: 18.0 t ADT: 469

US 3

Poor

Over: SOUHEGAN RIVER

0.03 MI FROM RAILROAD AVE, Hillsborough, NH

Built 1921 Load: 18.1 t ADT: 12,781

NH125

Poor

Over: ISINGLASS RIVER

.1 MI BARRINGTON T.L., Strafford, NH

Built 1951 Load: 18.4 t ADT: 14,083

NH 25

Poor

Over: OLIVERIAN BROOK

1.0 MI HAVERHILL T.L., Grafton, NH

Built 1960 Load: 19.1 t ADT: 1,051

WINDY ROW ROAD

Poor

Over: MCDOWELL RESERVOIR

0.6 MI FR PETERBORO TL, Hillsborough, NH

Built 1950 Load: 19.6 t ADT: 243

NH112,KANCAMAGUS

Poor

Over: PEMIGEWASSET RIVER

0.1 MI E JCT ROUTE 3, Grafton, NH

Built 1933 Load: 19.8 t ADT: 6,813

OLD NH 16

Poor

Over: THOMPSON BROOK

0.2 MI EAST JCT NH 16, Coos, NH

Built 1931 Load: 20.0 t ADT: 5

REC AREA ACCESS RD

Poor

Over: OTTER BROOK

8.05 KM N OF KEENE, Cheshire, NH

Built 1967 Load: 20.1 t ADT: 50

REC AREA ACCESS RD

Poor

Over: OTTER BROOK

8.05 KM N OF KEENE, Cheshire, NH

Built 1967 Load: 20.1 t ADT: 50

NH 12

Poor

Over: MILL BROOK

4.3 MI TO WALPOLE TL, Cheshire, NH

Built 1941 Load: 20.4 t ADT: 6,382

US202,NH101

Poor

Over: CONTOOCOOK RIVER

2.5 MI. W. DUBLIN TL, Hillsborough, NH

Built 1958 Load: 20.4 t ADT: 18,347

BRIDGE ROAD

Poor

Over: BLACKWATER RIVER

0.1 MI S NH 11, Merrimack, NH

Built 1882 Load: 20.9 t ADT: 90

NH 1A

Poor

Over: HAMPTON RIVER

0.1 MI FROM SEABROOK TL, Rockingham, NH

Built 1949 Load: 20.9 t ADT: 9,293

COCHECO ROAD

Poor

Over: COCHECO RIVER

0.15MI. RTE 75, Strafford, NH

Built 1953 Load: 21.0 t ADT: 1,747

FDR 29

Poor

Over: WALKER BROOK

MAP 29, Grafton, NH

Built 1975 Load: 21.1 t ADT: 50

EASTSIDE ROAD

Poor

Over: MARTINS BROOK

0.77MI WARREN TL, Grafton, NH

Built 1940 Load: 21.6 t ADT: 215

US 2

Poor

Over: PEA BROOK

0.8 MI FROM GORHAM TL, Coos, NH

Built 1932 Load: 22.0 t ADT: 4,291

NH 13

Poor

Over: SOUHEGAN RIVER

0.1 MI FROM MAPLE ST, Hillsborough, NH

Built 1931 Load: 22.0 t ADT: 12,511

FDR 12

Poor

Over: BURNT MILL BROOK

MAP 14, Coos, NH

Built 1947 Load: 22.4 t ADT: 50

NORTH ROAD

Poor

Over: ANDROSCOGGIN RIVER

0.32 MI N JCT US 2, Coos, NH

Built 1900 Load: 22.5 t ADT: 278

JACK WELLS ROAD

Poor

Over: FRAZIER BROOK

0.1 MI FR WILMOT T/L, Merrimack, NH

Built 1950 Load: 22.5 t ADT: 72

FEE TPK SB

Poor

Over: PENNICHUCK BROOK

NASHUA-MERRIMACK T.L., Hillsborough, NH

Built 1954 Load: 22.7 t ADT: 43,368

COLE HILL ROAD

Poor

Over: FOWLER RIVER

0.5 MI FROM SHIN VALLEY, Grafton, NH

Built 1930 Load: 23.3 t ADT: 90

NH 49

Poor

Over: PEMIGEWASSET RIVER

0.25 MI E JCT US 3, Grafton, NH

Built 1928 Load: 23.5 t ADT: 1,968

CHESHAM ROAD

Poor

Over: MINNEWAWA BROOK

0.3 MI FR DUBLIN TL, Cheshire, NH

Built 1939 Load: 23.9 t ADT: 1,549

LIBERTY FARM ROAD

Poor

Over: NORTH BRANCH RIVER

0.13MI. NH9, Hillsborough, NH

Built 1991 Load: 24.0 t ADT: 90

NUTTING ROAD

Poor

Over: CONTOOCOOK RIVER

0.4 MI FR CROSS ST, Cheshire, NH

Built 1905 Load: 24.1 t ADT: 1,777

US 3

Poor

Over: BABOOSIC BROOK

5.9 MI N NASHUA TL, Hillsborough, NH

Built 1933 Load: 24.1 t ADT: 14,709

FDR 17

Poor

Over: BURNT KNOLL

MAP 24, Carroll, NH

Built 1975 Load: 24.3 t ADT: 100

DRAKE HILL ROAD

Poor

Over: MEADOW BROOK

SE NH 16, Carroll, NH

Built 1930 Load: 24.5 t ADT: 107

NH119

Poor

Over: CONNECTICUT RIVER

AT VERMONT STATE LINE, Cheshire, NH

Built 1920 Load: 24.5 t ADT: 8,409

SCOTLAND ROAD

Poor

Over: ROARING BROOK

0.23MI NH119, Cheshire, NH

Built 1955 Load: 24.5 t ADT: 598

NH142

Poor

Over: AMMONOOSUC RIVER

2.2 MI FROM WHITEFIELD TL, Grafton, NH

Built 1927 Load: 24.5 t ADT: 1,214

NH 3A

Poor

Over: NEWFOUND RIVER

2.0 MI. FROM HILL T.L., Grafton, NH

Built 1949 Load: 24.5 t ADT: 3,364

TUNNEL BROOK ROAD

Poor

Over: WILD AMMONOOSUC RIVER

0.6 MI N. BENTON T.L., Grafton, NH

Built 1900 Load: 24.5 t ADT: 57

DORCHESTER ROAD

Poor

Over: GRANT BROOK

2.1 MI FROM JCT RTE 10, Grafton, NH

Built 1952 Load: 24.5 t ADT: 1,110

US202,NH123

Poor

Over: CONTOOCOOK RIVER

2.2 MI TO GREENFIELD TL, Hillsborough, NH

Built 1942 Load: 24.5 t ADT: 6,878

US 4

Poor

Over: SMITH RIVER

4.6 MI FROM WILMOT TL, Merrimack, NH

Built 1929 Load: 24.5 t ADT: 2,046

NH 25A

Poor

Over: BAKER POND BROOK

10.2 MI FROM VERMONT SL, Grafton, NH

Built 1929 Load: 25.3 t ADT: 805

I-293,NH 3A,TPK S

Poor

Over: BLACK BROOK

2.5MI S HOOKSETT T.L., Hillsborough, NH

Built 1956 Load: 25.3 t ADT: 21,510

I-293,NH 3A,TPK N

Poor

Over: BLACK BROOK

2.5 S HOOKSETT TL, Hillsborough, NH

Built 1956 Load: 25.3 t ADT: 23,559

HILL ROAD

Poor

Over: PERRY STREAM

0.2 MI FROM US RTE 3, Coos, NH

Built 1860 Load: 25.8 t ADT: 220

SHEEPBORO ROAD

Poor

Over: BERRYS RIVER

1.22 MI ROCHESTER TL, Strafford, NH

Built 1983 Load: 25.8 t ADT: 20

NH 3A

Poor

Over: NEWFOUND RIVER

1.2 MI N OF JCT RTE 104, Grafton, NH

Built 1924 Load: 25.9 t ADT: 6,806

US 3

Poor

Over: LOST RIVER

5.6 MI FROM THORNTON TL, Grafton, NH

Built 1931 Load: 26.3 t ADT: 2,669

NH 11B

Poor

Over: GUNSTOCK RIVER

0.6 MI N JCT NH 11-A, Belknap, NH

Built 1941 Load: 26.5 t ADT: 2,650

NH 16,SP TPK SB

Poor

Over: NH108,CSX(ABD)

0.2 MI FROM JCT. RT 16, Strafford, NH

Built 1957 Load: 26.5 t ADT: 20,752

NH 16,SP TPK NB

Poor

Over: NH108,CSX(ABD)

0.2 MI FROM JCT. RTE 16, Strafford, NH

Built 1957 Load: 26.5 t ADT: 21,665

NH101

Poor

Over: OTTER BROOK

1.5 MI FROM MARLBORO TL, Cheshire, NH

Built 1933 Load: 27.3 t ADT: 11,367

NH 12A

Poor

Over: NHRR

100 FT FROM JCT RTE 10, Grafton, NH

Built 1949 Load: 27.9 t ADT: 8,338

Showing 2,401-2,450 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.