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

NH 10

Fair

Over: STOCKER BROOK

1.6 MI. FROM CROYDON TL, Sullivan, NH

Built 1936 Load: 22.9 t ADT: 6,794

FDR 39

Fair

Over: LANGDON BROOK

MAP 24, Carroll, NH

Built 1970 Load: 23.0 t ADT: 50

WELTON FALLS ROAD

Fair

Over: FOWLER RIVER

0.8 MI FR RED SCHOOL RD, Grafton, NH

Built 1965 Load: 23.0 t ADT: 90

LEBRUN ROAD

Fair

Over: S BRANCH BAKER RIVER

1.1 MI NH 118, Grafton, NH

Built 1930 Load: 23.0 t ADT: 90

NH 25,NH118

Fair

Over: BAKER RIVER

3.6 MI FROM RUMNEY TL, Grafton, NH

Built 1937 Load: 23.0 t ADT: 3,351

JEFFERS HILL ROAD

Fair

Over: OLIVERIAN BROOK

0.12 MI FR NH RTE 25, Grafton, NH

Built 1978 Load: 23.1 t ADT: 90

NH 10

Fair

Over: ASHUELOT RIVER

4.0 MI NORTH OF KEENE TL, Cheshire, NH

Built 1949 Load: 23.2 t ADT: 2,420

EAST SURRY ROAD

Fair

Over: ASHUELOT RIVER

TOWN RD 0.33MI KEENE TL, Cheshire, NH

Built 1940 Load: 23.2 t ADT: 817

NH 10

Fair

Over: OLIVERIAN BROOK

1.0 MI EAST VERMONT SL, Grafton, NH

Built 1937 Load: 23.2 t ADT: 2,288

FDR 20

Fair

Over: GARDINER BROOK

MAP 33, Carroll, NH

Built 1981 Load: 23.3 t ADT: 50

BARNET ROAD

Fair

Over: CONNECTICUT RIVER

VERMONT STATE LINE, Grafton, NH

Built 1937 Load: 23.3 t ADT: 973

BICKFORD HILL ROAD

Fair

Over: HAM BRANCH

0.07MI. RTE 116, Grafton, NH

Built 1973 Load: 23.5 t ADT: 90

NH112

Fair

Over: WILD AMMONOOSUC RIVER

1.3 MI WEST OF EASTON TL, Grafton, NH

Built 1932 Load: 23.5 t ADT: 1,061

NH 25A

Fair

Over: CONNECTICUT RIVER

VERMONT STATE LINE, Grafton, NH

Built 1937 Load: 23.5 t ADT: 3,554

NH 12,NH101

Fair

Over: ASHUELOT RIVER,PED TRAIL

1.0 MI. FROM KEENE CENTER, Cheshire, NH

Built 1961 Load: 23.6 t ADT: 22,443

GREENHILL ROAD

Fair

Over: ISINGLASS RIVER

3.1 MI FR DOVER TL, Strafford, NH

Built 1955 Load: 23.6 t ADT: 2,031

FDR 381

Fair

Over: TUTTLE BROOK

MAP 10, Grafton, NH

Built 1980 Load: 23.7 t ADT: 50

FDR 211

Fair

Over: E.BR. BAKER RIVER

MAP 36, Grafton, NH

Built 1976 Load: 23.7 t ADT: 100

BASE STATION ROAD

Fair

Over: AMMONOOSUC RIVER

4.3 MI NE US302, Coos, NH

Built 1937 Load: 23.9 t ADT: 1,775

CANAL STREET

Fair

Over: NASHUA RIVER

0.6 MI FROM ROUTE 3, Hillsborough, NH

Built 1928 Load: 23.9 t ADT: 14,567

NH202A

Fair

Over: ISINGLASS RIVER

2.5 MI FROM NORTHWOOD TL, Strafford, NH

Built 1923 Load: 23.9 t ADT: 2,179

CUTLER ROAD

Fair

Over: BLOODS BROOK

175 FT FR BLOODBROOK RD, Sullivan, NH

Built 1940 Load: 23.9 t ADT: 90

NO DATA ENTERED

Fair

Over: LOUISEVILLE BROOK

MAP 32, Carroll, NH

Built 1953 Load: 24.0 t ADT: 50

FDR 15

Fair

Over: TRIB. TO AMMONOOSUC

MAP 02, Coos, NH

Built 1949 Load: 24.0 t ADT: 99

NORTH WILMOT ROAD

Fair

Over: KIMPTON BROOK

0.04MI NH4A, Merrimack, NH

Built 1968 Load: 24.0 t ADT: 371

NH 11

Fair

Over: BK BAY LA WINNIPESAUKEE

0.25 MI N ALTON BAY, Belknap, NH

Built 1942 Load: 24.1 t ADT: 6,245

NH 13

Fair

Over: S BR PISCATAQUOG RIVER

0.8 MI S OF JCT RTE 136, Hillsborough, NH

Built 1947 Load: 24.1 t ADT: 4,777

US 3

Fair

Over: MAPLE ST,NHRR

2.3 MI FROM LACONIA T.L., Belknap, NH

Built 1947 Load: 24.3 t ADT: 17,678

GOVE ROAD

Fair

Over: FOWLER RIVER

0.1 MI FR NO RIVER RD, Grafton, NH

Built 1965 Load: 24.3 t ADT: 90

SHARON ROAD

Fair

Over: CONTOOCOOK RIVER

1.28 MI SHARON TL, Hillsborough, NH

Built 1925 Load: 24.3 t ADT: 636

NH103

Fair

Over: WARNER RIVER

SUTTON TL, Merrimack, NH

Built 1936 Load: 24.3 t ADT: 3,704

NH103

Fair

Over: WARNER RIVER

0.1 MI FROM JCT I-89, Merrimack, NH

Built 1936 Load: 24.3 t ADT: 3,704

NH 11B

Fair

Over: GUNSTOCK RIVER

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

Built 1931 Load: 24.5 t ADT: 2,650

NH 11A

Fair

Over: POOR FARM BROOK

5.9 MI EAST LACONIA TL, Belknap, NH

Built 1936 Load: 24.5 t ADT: 5,198

RIVER ROAD

Fair

Over: SACO RIVER

2.1 MI FROM BARTLETT TL, Carroll, NH

Built 1950 Load: 24.5 t ADT: 4,565

CROSS ROAD

Fair

Over: CATSBANE BROOK

TOWN RD, Cheshire, NH

Built 1963 Load: 24.5 t ADT: 539

US202

Fair

Over: MOUNTAIN BROOK

1.0 MI TO RINDGE TL, Cheshire, NH

Built 1939 Load: 24.5 t ADT: 8,103

NH 10,NH123

Fair

Over: ASHUELOT RIVER

3.0 MI FROM GILSUM TL, Cheshire, NH

Built 1949 Load: 24.5 t ADT: 2,419

NH 12

Fair

Over: NHRR(ABD)

.5 MI E WESTMORELAND TL, Cheshire, NH

Built 1948 Load: 24.5 t ADT: 8,010

SEVEN ISLANDS BR

Fair

Over: ANDROSCOGGIN RIVER

Adjacent to Errol 071/030, Coos, NH

Built 1951 Load: 24.5 t

NH 16

Fair

Over: PEABODY RIVER

1.1 MI NE MARTINS LOC TL, Coos, NH

Built 1950 Load: 24.5 t ADT: 4,107

YEATON ROAD

Fair

Over: SPENCER BROOK

0.9 MI N JCT NH 3-A, Grafton, NH

Built 1919 Load: 24.5 t ADT: 307

NH112

Fair

Over: SABBADAY BROOK

0.8 MI WEST OF ALBANY TL, Grafton, NH

Built 1953 Load: 24.5 t ADT: 5,273

NH112,LOST RIV RD

Fair

Over: LOST RIVER

1.9 MI W OF JCT RT 118, Grafton, NH

Built 1957 Load: 24.5 t ADT: 1,652

NH 31

Fair

Over: CONTOOCOOK RIVER

1.24 MI. NE HANCOCK TL, Hillsborough, NH

Built 1934 Load: 24.5 t ADT: 1,650

BOND STREET

Fair

Over: NISSITISSIT RIVER

2.15 MI FROM MASS. SL, Hillsborough, NH

Built 1946 Load: 24.5 t ADT: 937

NH 13

Fair

Over: S BR PISCATAQUOG RIVER

.1 MI FROM JCT RT 136, Hillsborough, NH

Built 1937 Load: 24.5 t ADT: 3,692

MORRISON ROAD

Fair

Over: CONTOOCOOK RIVER

0.8 MI FR OLD SHARON RD9, Hillsborough, NH

Built 1958 Load: 24.5 t ADT: 1,387

ACCESS ROAD

Fair

Over: JOE ENGLISH BROOK

0.8 MILES FROM ON-ORBIT D, Hillsborough, NH

Built 2008 Load: 24.5 t ADT: 10

FORBES MTN ROAD

Fair

Over: WILD MEADOW BROOK

2.2 MI FR NORTH RD, Merrimack, NH

Built 1950 Load: 24.5 t ADT: 90

Showing 601-650 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.