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

FDR 15

Fair

Over: UPPER AMMONOOSUC

MAP 02, Coos, NH

Built 1949 Load: 20.4 t ADT: 50

FDR 92

Fair

Over: N.BR. GALE RIVER

MAP 19, Grafton, NH

Built 1971 Load: 20.4 t ADT: 50

COLDBROOK ROAD

Fair

Over: MOOSE RIVER

0.4 MI FROM US RTE 2, Coos, NH

Built 1949 Load: 20.6 t ADT: 90

FDR 127

Fair

Over: WITCHER BROOK

MAP 27, Coos, NH

Built 1977 Load: 20.7 t ADT: 99

FDR 203

Fair

Over: OSCEOLA BROOK

MAP 38, Grafton, NH

Built 1976 Load: 20.7 t ADT: 50

BLAKE ROAD

Fair

Over: LAMPREY RIVER

TOWN RD, Rockingham, NH

Built 1952 Load: 20.8 t ADT: 555

MCINTYRE ROAD

Fair

Over: ARBORETUM DRIVE

TOWN RD, Rockingham, NH

Built 1972 Load: 20.8 t ADT: 1,413

NEW ROAD

Fair

Over: MELVIN RIVER

0.8 MI FROM NH RTE 109, Carroll, NH

Built 1940 Load: 20.9 t ADT: 240

MARLBORO ROAD

Fair

Over: FARRAR POND

.59 MI. S. MARLBOROUGH TL, Cheshire, NH

Built 1933 Load: 20.9 t ADT: 479

US 4

Fair

Over: INDIAN RIVER

4.7 MI FROM ENFIELD TL, Grafton, NH

Built 1930 Load: 20.9 t ADT: 5,839

NH118

Fair

Over: BAKER RIVER

0.9 MI FROM JCT RTE 25, Grafton, NH

Built 1947 Load: 20.9 t ADT: 1,127

NICHOLS HILL ROAD

Fair

Over: POND BROOK

0.09MI NH25A, Grafton, NH

Built 1940 Load: 20.9 t ADT: 90

US 3,ELM ST

Fair

Over: CSX(ABD)

.2 MI N OF JCT RT 3A, Hillsborough, NH

Built 1915 Load: 20.9 t ADT: 13,386

FRONT STREET

Fair

Over: SALMON FALLS RIVER

ME.-NH STATE LINE, Strafford, NH

Built 1962 Load: 20.9 t ADT: 2,003

BEAN MOUNTAIN ROAD

Fair

Over: LOVELL RIVER

0.01 MI W PINE HILL ROAD, Carroll, NH

Built 1999 Load: 21.0 t ADT: 90

WEST STREET

Fair

Over: ASHUELOT RIVER

0.6 MI FROM KEENE CENTER, Cheshire, NH

Built 1952 Load: 21.0 t ADT: 15,233

DWYER ROAD

Fair

Over: POND OUTLET

0.3 MI FR US RTE 302, Grafton, NH

Built 1930 Load: 21.0 t ADT: 90

MILL ROAD

Fair

Over: GRIDLEY RIVER

0.5 MI FROM JAFFREY TL, Hillsborough, NH

Built 1927 Load: 21.0 t ADT: 94

WADLEIGH HILL ROAD

Fair

Over: LANE RIVER

0.96 MI SOUTH N. SUTTON, Merrimack, NH

Built 1985 Load: 21.0 t ADT: 90

NEAL MINE ROAD

Fair

Over: LITTLE SUGAR RIVER

80 FT FROM STAGE ROAD 72, Sullivan, NH

Built 2011 Load: 21.0 t ADT: 90

FDR 86

Fair

Over: N.BR. SAWYER RIVER

MAP 31, Carroll, NH

Built 1976 Load: 21.1 t ADT: 50

FDR 352

Fair

Over: BOWEN BROOK

MAP 28, Grafton, NH

Built 1984 Load: 21.1 t ADT: 50

FDR 123

Fair

Over: OLIVERIAN BROOK

MAP 27, Grafton, NH

Built 1965 Load: 21.1 t ADT: 50

PARADE HILL ROAD

Fair

Over: SUNCOOK RIVER

0.1 MI S RTE 28, Belknap, NH

Built 1948 Load: 21.2 t ADT: 368

FDR 233

Fair

Over: WILDCAT BROOK

MAP 23, Carroll, NH

Built 1977 Load: 21.4 t ADT: 50

US202

Fair

Over: CONTOOCOOK RIVER

2.0 MI FROM PETERBORO TL, Cheshire, NH

Built 1937 Load: 21.4 t ADT: 7,296

QUINTTOWN ROAD

Fair

Over: JACOBS BROOK

.45 MI. SO. MOUSLEY BR RD, Grafton, NH

Built 2007 Load: 21.4 t ADT: 90

NH 77

Fair

Over: MID BR PISCATAQUOG RIVER

0.2 MI S OF WEARE TL, Hillsborough, NH

Built 1949 Load: 21.4 t ADT: 2,726

NH 27

Fair

Over: LAMPREY RIVER

.65 MI. SE RAYMOND TL, Rockingham, NH

Built 1935 Load: 21.4 t ADT: 4,848

NH120

Fair

Over: GREAT BROOK

2.3 MI FROM PLAINFIELD TL, Grafton, NH

Built 1935 Load: 21.6 t ADT: 2,619

NH130

Fair

Over: VILLAGE BROOK

.5 MI JCT RT 13, Hillsborough, NH

Built 1935 Load: 21.6 t ADT: 4,313

OLD STATE ROAD

Fair

Over: JABES MEADOW BROOK

0.3 MI S JCT NH 12A, Sullivan, NH

Built 1993 Load: 21.6 t ADT: 480

NH 10

Fair

Over: GILES BROOK

0.4 MI FROM GOSHEN TL, Sullivan, NH

Built 1934 Load: 21.8 t ADT: 1,715

WATER STREET

Fair

Over: MINNEWAWA BROOK

.09 MI. N. JCT. NH 101, Cheshire, NH

Built 1930 Load: 21.9 t ADT: 546

WILTON ROAD

Fair

Over: SOUHEGAN RIVER

200' W OF ELM ST (NH101), Hillsborough, NH

Built 1917 Load: 21.9 t ADT: 6,615

NH 11

Fair

Over: PLEASANT STREAM

.3 MI FROM WILMOT T.L., Merrimack, NH

Built 1959 Load: 21.9 t ADT: 5,015

NH 18

Fair

Over: GALE RIVER

1.6 MI FROM SUGAR HILL TL, Grafton, NH

Built 1930 Load: 22.0 t ADT: 690

US202,NH124

Fair

Over: CONTOOCOOK RIVER

3.0 MI PETERBORO TL, Cheshire, NH

Built 1938 Load: 22.1 t ADT: 11,890

RIVER ROAD

Fair

Over: BROOK

.72 MI. SW JCT. 10 AND 25, Grafton, NH

Built 1951 Load: 22.2 t ADT: 1,084

CREAMERY ROAD

Fair

Over: JACOBS BROOK

0.4 MI FR ARCHERTOWN RD, Grafton, NH

Built 1950 Load: 22.4 t ADT: 90

RIVER ROAD

Fair

Over: PERRY STREAM

0.5 MI FROM US RTE 3, Coos, NH

Built 1984 Load: 22.5 t ADT: 90

FDR 11

Fair

Over: MILL BROOK

MAP 01, Coos, NH

Built 1983 Load: 22.7 t ADT: 50

EASTERN CORNER RD

Fair

Over: BEEBE RIVER

2.2MI FR NH ROUTE 175, Grafton, NH

Built 1920 Load: 22.7 t ADT: 90

NH 9,NH 31

Fair

Over: NORTH BRANCH RIVER

4.5 MI FROM STODDARD TL, Hillsborough, NH

Built 1951 Load: 22.7 t ADT: 6,761

FEE TPK NB

Fair

Over: PENNICHUCK BROOK

NASHUA-MERRIMACK TL, Hillsborough, NH

Built 1954 Load: 22.7 t ADT: 47,314

GRANT ROAD

Fair

Over: PISCASSIC RIVER

.61 MI. SW JCT. 152, Rockingham, NH

Built 1947 Load: 22.7 t ADT: 2,332

NH 16B

Fair

Over: GREAT BROOK

1.7 MI JCT 16-A, Carroll, NH

Built 1937 Load: 22.9 t ADT: 459

NH 25

Fair

Over: NORTH BRANCH RIVER

1.0 MI FROM BENTON TL, Grafton, NH

Built 1928 Load: 22.9 t ADT: 1,051

MOUNTAIN ROAD

Fair

Over: ANDREW BROOK

1.25 MI. RTE. 103, Merrimack, NH

Built 1936 Load: 22.9 t ADT: 235

RED WATER BROOK RD

Fair

Over: RED WATER BROOK

0.9MI NH11, Sullivan, NH

Built 1925 Load: 22.9 t ADT: 311

Showing 551-600 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.