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

PARADISE ROAD

Structurally Deficient

Over: SUGAR RIVER

380 FT. RTE.11, Sullivan, NH

Built 1976 ADT: 90

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

LEIGHTON MEADOW RD

Structurally Deficient

Over: PHILLIPS BROOK

100 FT FR SULLIVAN RD 61, Coos, NH

Built 1940 Load: 3.6 t ADT: 90

RIVER ROAD

Structurally Deficient

Over: MAD RIVER

0.63MI. RTE 111, Strafford, NH

Built 1986 Load: 3.6 t ADT: 108

JOHNSON HILL ROAD

Structurally Deficient

Over: WEST BRANCH BROOK

1.5 MI MARSHALL HILL RD, Merrimack, NH

Built 1950 Load: 5.4 t ADT: 90

OAK STREET

Structurally Deficient

Over: CSX

DOVER-ROLLINSFORD TL, Strafford, NH

Built 1890 Load: 5.4 t ADT: 8,552

PUTNAM ROAD

Structurally Deficient

Over: BROOK

TOWN RD, Hillsborough, NH

Built 1930 Load: 5.8 t ADT: 90

ON-ORBIT DRIVE

Structurally Deficient

Over: GARDNER-JOE ENGLISH STRE

1.2 MILES FROM MAIN GATE., Hillsborough, NH

Built 1959 Load: 6.3 t ADT: 10

CENTENARY AVENUE

Structurally Deficient

Over: NHRR

TOWN RD, Belknap, NH

Built 1940 Load: 8.0 t ADT: 90

CHICKWOLNEPY ROAD

Structurally Deficient

Over: CHICKWOLNEPY STREAM

1.2 M FR E. SIDE RIVER RD, Coos, NH

Built 1950 Load: 8.0 t ADT: 90

RIVER ROAD

Structurally Deficient

Over: PISCATAQUOG RIVER

0.5 MI FROM NH 77, Hillsborough, NH

Built 1940 Load: 8.2 t ADT: 1,824

TEMPLE ROAD

Structurally Deficient

Over: BLOOD BROOK

0.02 MI SW JCT NH101, Hillsborough, NH

Built 1901 Load: 9.8 t ADT: 1,214

CATE STREET

Structurally Deficient

Over: HODGSON BROOK

.2 WEST OF BARTLETT St., Rockingham, NH

Built 1940 Load: 10.0 t ADT: 1,340

GRIFFIN MILL ROAD

Structurally Deficient

Over: MAPLE FALLS BROOK

300 YDS N. OF NH 121, Rockingham, NH

Built 1850 Load: 12.4 t ADT: 187

NH175

Structurally Deficient

Over: PEMIGEWASSET RIVER

0.05 MI FROM JCT RTE 3, Grafton, NH

Built 1939 Load: 12.6 t ADT: 664

POND ROAD

Structurally Deficient

Over: CSX

0.6 MI. KINGSTON TL, Rockingham, NH

Built 1920 Load: 12.6 t ADT: 470

CLOTHESPIN BR ROAD

Structurally Deficient

Over: BLACKWATER RIVER

0.88MI NH127, Merrimack, NH

Built 1954 Load: 14.5 t ADT: 448

NH127

Structurally Deficient

Over: WARNER RIVER

.5 MI WEBSTER T.L., Merrimack, NH

Built 1937 Load: 14.9 t ADT: 1,550

NH 12A

Structurally Deficient

Over: SUGAR RIVER

.1 MI. FROM JCT. RTE. 103, Sullivan, NH

Built 1967 Load: 15.1 t ADT: 1,051

NH 1B

Structurally Deficient

Over: LITTLE HARBOR

1.1 MI JCT RT 1-A, Rockingham, NH

Built 1942 Load: 15.3 t ADT: 3,283

SCRIBNER ROAD

Structurally Deficient

Over: EXETER RIVER

0.59MI. RTE 107, Rockingham, NH

Built 1941 Load: 15.4 t ADT: 238

POTATO ROAD

Structurally Deficient

Over: INDIAN RIVER

1.5 MI FROMENFIELD TL, Grafton, NH

Built 1930 Load: 16.0 t ADT: 624

TRUE'S BROOK ROAD

Structurally Deficient

Over: BLOODS BROOK

0.4 MI FR PLAINFIELD TL, Grafton, NH

Built 1952 Load: 16.3 t ADT: 1,068

FISH HATCHERY ROAD

Structurally Deficient

Over: PATCH BROOK

0.17MI NH25, Grafton, NH

Built 1930 Load: 16.3 t ADT: 44

EAST THETFORD ROAD

Structurally Deficient

Over: CONNECTICUT RIVER

0.1 MI FROM VERMONT SL, Grafton, NH

Built 1937 Load: 18.1 t ADT: 2,118

HILL ROAD

Structurally Deficient

Over: DARBY BROOK

.08 MI FR DINSMORE HILL, Cheshire, NH

Built 1970 Load: 18.4 t ADT: 90

FDR 35

Structurally Deficient

Over: DOUGLAS BROOK

MAP 32, Carroll, NH

Built 1950 Load: 18.8 t ADT: 50

US202,NH 9

Structurally Deficient

Over: ASH BROOK

1 MI FROM CURRIER RD, Merrimack, NH

Built 1970 Load: 19.6 t ADT: 2,807

BOG ROAD

Structurally Deficient

Over: CONNECTICUT RIVER

0.02 MILE EAST OF VT. S L, Coos, NH

Built 1893 Load: 22.9 t ADT: 300

US 1

Structurally Deficient

Over: CSX

1.1MI FROM RYE TL, Rockingham, NH

Built 1935 Load: 22.9 t ADT: 15,098

US 1

Structurally Deficient

Over: CSX(ABD)

0.1 MI FROM N HAMPTON TL, Rockingham, NH

Built 1936 Load: 23.2 t ADT: 16,112

MAPLEWOOD AVENUE

Structurally Deficient

Over: NORTH MILL POND

0.2 MI E JCT US 1 BYPASS, Rockingham, NH

Built 1940 Load: 25.0 t ADT: 6,472

US 4

Structurally Deficient

Over: BLACKWATER RIVER

0.3 MI FROM SALISBURY TL, Merrimack, NH

Built 1933 Load: 29.8 t ADT: 2,600

NH 32

Structurally Deficient

Over: MARTIN BROOK

1.48 MI. N. RICHMOND TL, Cheshire, NH

Built 1929 Load: 30.0 t ADT: 2,912

NH152

Structurally Deficient

Over: NORTH RIVER

5.15MI. NW LEE TL, Rockingham, NH

Built 1925 Load: 30.2 t ADT: 3,415

NH 9(LOUDON ROAD)

Structurally Deficient

Over: MERRIMACK RIVER

0.1 MI EAST JCT I-93, Merrimack, NH

Built 1966 Load: 31.7 t ADT: 23,188

NH 11

Structurally Deficient

Over: SUCKER BROOK

0.4 MI FROM FRANKLIN T.L., Merrimack, NH

Built 1929 Load: 32.3 t ADT: 2,622

FOWLER RIVER ROAD

Structurally Deficient

Over: FOWLER RIVER

5.2MI FR TUFTONBORO TL, Grafton, NH

Built 1930 Load: 32.7 t ADT: 234

NH 12

Structurally Deficient

Over: S BRANCH ASHUELOT RIVER

1.5 MI S TO TROY CENTER, Cheshire, NH

Built 1941 Load: 41.7 t ADT: 8,843

MAPLE AVE

Structurally Deficient

Over: BLACK BROOK

DOWNTOWN KEENE, Cheshire, NH

Built 1961 Load: 89.8 t ADT: 3,140

Showing 2,501-2,542 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.