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

BEAN BROOK ROAD

Fair

Over: BEAN BROOK

0.5 MI. PIERPONT TL, Grafton, NH

Built 1995 Load: 89.8 t ADT: 90

I-93 SB

Fair

Over: INDIAN CREEK

0.7 MI S BETHLEHEM TL, Grafton, NH

Built 1959 Load: 89.8 t ADT: 2,593

I-93 SB

Fair

Over: HUBBARD BROOK

1.9 MI S WOODSTOCK TL, Grafton, NH

Built 1970 Load: 89.8 t ADT: 7,156

I-93 NB

Fair

Over: HUBBARD BROOK

1.3 MI S WOODSTOCK TL, Grafton, NH

Built 1970 Load: 89.8 t ADT: 6,997

NH122,AMHERST ST

Fair

Over: BEAVER BROOK

2.15 MI NE MILFORD TL, Hillsborough, NH

Built 1940 Load: 89.8 t ADT: 6,927

I-93 NB,I-93 RAMP

Fair

Over: COHAS BROOK

1.6 MI E JCT RT 28, Hillsborough, NH

Built 1962 Load: 89.8 t ADT: 37,900

US202

Fair

Over: OUTLET PRATT POND

0.4 MI JAFFREY TL, Hillsborough, NH

Built 1956 Load: 89.8 t ADT: 9,478

DEERFIELD ROAD

Fair

Over: BEAR BROOK

1.3 MI NE JCT 28, Merrimack, NH

Built 1980 Load: 89.8 t ADT: 2,697

I-93

Fair

Over: WILLIAMS BROOK

4.19MI CANTERBURY TL, Merrimack, NH

Built 1960 Load: 89.8 t ADT: 30,483

GULF ROAD

Fair

Over: FRESH CREEK

1.5 MI. FROM JCT. RTE. 4, Strafford, NH

Built 1948 Load: 89.8 t ADT: 5,721

NH 11,NH 12

Fair

Over: LITTLE SUGAR RIVER

2.2 MI. FROM CLAREMONT TL, Sullivan, NH

Built 1964 Load: 89.8 t ADT: 7,817

I-89,NH 10 NB

Fair

Over: SKINNER BROOK

3.95 MI SPRINGFIELD T.L., Sullivan, NH

Built 1959 Load: 89.8 t ADT: 10,644

I-89,NH 10 SB

Fair

Over: SKINNER BROOK

4.43 MI SPRINGFIELD T.L., Sullivan, NH

Built 1972 Load: 89.8 t ADT: 10,825

NH 11

Fair

Over: OTTER POND OUTLET

0.5 MI. FROM NEW LONDON T, Sullivan, NH

Built 1954 Load: 89.8 t ADT: 8,214

US302

Fair

Over: BROOK

3.8 MI. FROM N.H. 16, Carroll, NH

Built 1961 Load: 99.9 t ADT: 5,300

RIVER ROAD

Fair

Over: FOGG BROOK

3.89 MI N. OF JCT. 104, Grafton, NH

Built 1974 Load: 99.9 t ADT: 553

DAISY HILL ROAD

Fair

Over: GREAT BROOK

0.09 MI FR NH RTE 120, Grafton, NH

Built 1955 Load: 99.9 t ADT: 618

NH 10

Fair

Over: TROUT BROOK

5.58 MI N OF HANOVER TL, Grafton, NH

Built 1969 Load: 99.9 t ADT: 1,615

DREWSVILLE ROAD

Fair

Over: GREAT BROOK

1.49 MI. N. WALPOLE TL, Sullivan, NH

Built 1955 Load: 99.9 t ADT: 870

HEMLOCK ROAD

Fair

Over: GREAT BROOK

100 FT FROM MAIN ST, Sullivan, NH

Built 1940 Load: 99.9 t ADT: 90

NO DATA ENTERED

Good

Over: ALBANY BROOK

NO DATA ENTERED, Carroll, NH

Built 1998 ADT: 10

NO DATA ENTERED

Good

Over: TRIB TO LOUISVILLE BROOK

NO DATA ENTERED, Carroll, NH

Built 2023 ADT: 50

PASSACONAWAY ROAD

Good

Over: SWIFT RIVER

0.1 MI FR KANCAMAGUS HWY, Carroll, NH

Built 1858 Load: 5.9 t ADT: 308

GUNN MOUNTAIN ROAD

Good

Over: ASHUELOT RIVER

0.02MI NH119, Cheshire, NH

Built 1864 Load: 6.4 t ADT: 809

NO DATA ENTERED

Good

Over: NO DATA ENTERED

NO DATA ENTERED, Grafton, NH

Built 2000 Load: 7.5 t ADT: 50

NO DATA ENTERED

Good

Over: BUZZELL BROOK

NO DATA ENTERED, Grafton, NH

Built 2000 Load: 7.5 t ADT: 50

BRADFORD CENTER RD

Good

Over: W BR WARNER RIVER

6.3 MI WASHINGTON TL, Merrimack, NH

Built 1854 Load: 8.6 t ADT: 90

NH113A

Good

Over: COLD RIVER

0.9 MI WING ROAD ROAD, Carroll, NH

Built 1935 Load: 11.1 t ADT: 480

BEARCAMP POND ROAD

Good

Over: BEARCAMP RIVER

0.5 MI FROM NH RTE 25, Carroll, NH

Built 1900 Load: 13.2 t ADT: 90

MAPLE STREET

Good

Over: NHRR(ABD)

0.04 MI NH 11, Merrimack, NH

Built 1930 Load: 13.9 t ADT: 319

BRYANT ROAD

Good

Over: MILL BROOK

0.8 MI FROM NH ROUTE 113, Carroll, NH

Built 1940 Load: 14.5 t ADT: 90

RIVERDALE ROAD

Good

Over: NEWFOUND RIVER

0.02 MI WEST OF NH 3A, Grafton, NH

Built 1949 Load: 14.5 t ADT: 125

CONVERSE ROAD

Good

Over: BROOK

TOWN RD, Hillsborough, NH

Built 1980 Load: 14.5 t ADT: 90

LOWER MEADOW ROAD

Good

Over: MILL BROOK

0.11 MI. RTE 4, Grafton, NH

Built 2013 Load: 15.1 t ADT: 90

STEWART ROAD

Good

Over: BROOK

0.29MI DANBURY TL, Merrimack, NH

Built 1960 Load: 15.1 t ADT: 90

OLDS ROAD

Good

Over: DODGE BROOK

0.3 MI E NH 10, Sullivan, NH

Built 2022 Load: 15.2 t ADT: 90

COLLINS BROOK ROAD

Good

Over: COLLINS BROOK

0.3 MI FROM NH RTE 111, Rockingham, NH

Built 1989 Load: 15.5 t ADT: 481

HOBBS HILL ROAD

Good

Over: BROOK

TOWN RD, Merrimack, NH

Built 1990 Load: 16.3 t ADT: 90

RIVER ROAD

Good

Over: DODGE BROOK

.67 MI. N. JCT. NH 123-A, Sullivan, NH

Built 1933 Load: 16.3 t ADT: 174

ALLEN ROAD

Good

Over: COLD RIVER

.6 MI FROM LEMPSTER TL, Sullivan, NH

Built 1975 Load: 16.3 t ADT: 1,214

GRIFFIN HILL ROAD

Good

Over: WARREN BROOK

0.05 MI N OF NH 123, Cheshire, NH

Built 1920 Load: 16.8 t ADT: 90

TYLER ROAD

Good

Over: BLACKWATER RIVER

0.1 MI N HOPKINTON TL, Merrimack, NH

Built 1937 Load: 16.8 t ADT: 90

NH 11

Good

Over: MAD RIVER

1.7 MI NEW DURHAM TL, Strafford, NH

Built 1955 Load: 16.8 t ADT: 11,942

ORANGE ROAD

Good

Over: INDIAN RIVER

100 FT E. OF JCT. NH 118, Grafton, NH

Built 1946 Load: 18.0 t ADT: 1,292

LOCKHAVEN ROAD

Good

Over: CRYSTAL LAKE OUTLET

3.4 MI FR GRAFTON TL, Grafton, NH

Built 1982 Load: 18.1 t ADT: 924

RESERVOIR ROAD

Good

Over: PISCATAQUOG RIVER

TOWN RD, Hillsborough, NH

Built 1973 Load: 18.1 t ADT: 195

FDR 71

Good

Over: CULHANE BROOK

MAP 13, Coos, NH

Built 1960 Load: 18.5 t ADT: 50

FOWLER RIVER ROAD

Good

Over: FOWLER RIVER

1 MI FROM BRISTOL T.L., Grafton, NH

Built 1954 Load: 19.0 t ADT: 90

BUNKER HILL ROAD

Good

Over: MILL BROOK

2.1 MI. RTE.113, Carroll, NH

Built 2020 Load: 19.1 t ADT: 90

NH 26

Good

Over: CORSER BROOK

3.0 MI W OF RTE 16, Coos, NH

Built 1954 Load: 19.1 t ADT: 971

Showing 1,251-1,300 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.