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

MACKENZIE ROAD

Good

Over: ACADEMY BROOK

0.8 MI FR NH 106, Merrimack, NH

Built 2023 Load: 26.3 t ADT: 90

FOREST ROAD

Good

Over: COLD RIVER

1.06 MI FROM LANGDONTL, Sullivan, NH

Built 1974 Load: 26.3 t ADT: 149

JEWELL STREET

Good

Over: POWWOW RIVER

.18 MI. FROM MASS. SL, Rockingham, NH

Built 1960 Load: 26.5 t ADT: 1,093

NH126

Good

Over: ISINGLASS RIVER

0.8 MI FROM STRAFFORD TL, Strafford, NH

Built 1947 Load: 26.5 t ADT: 1,245

KINSMAN ROAD

Good

Over: SMITH BROOK

0.27 MI. SPRINGFIELD TL, Grafton, NH

Built 1983 Load: 26.6 t ADT: 90

LYNDEBOROUGH ROAD

Good

Over: S BR PISCATAQUOG RIVER

0.8 MI FR COCHORAN HILL, Hillsborough, NH

Built 1940 Load: 26.6 t ADT: 430

HOOKSETT TURNPIKE

Good

Over: BELA BROOK

0.18 MI FR BOW TL, Merrimack, NH

Built 2021 Load: 26.6 t ADT: 711

NH103

Good

Over: STEVENS BROOK

.1 MI E JCT RT 89, Merrimack, NH

Built 1966 Load: 26.8 t ADT: 7,111

LYMAN ROAD

Good

Over: MILL BROOK

1.09 MI NW JCT 302, Grafton, NH

Built 1928 Load: 26.9 t ADT: 1,214

NH175

Good

Over: EASTMAN BROOK

.2 MI FROM THORNTON TL, Grafton, NH

Built 1973 Load: 26.9 t ADT: 180

NH126

Good

Over: BIG RIVER

3.5 MI FROM STRAFFORD TL, Belknap, NH

Built 1964 Load: 27.1 t ADT: 3,634

EAST MILAN ROAD

Good

Over: STEARNS BROOK

1.4MI FROM BERLIN TL, Coos, NH

Built 1982 Load: 27.1 t ADT: 999

CIRCUMFERENTIAL WB

Good

Over: MERRIMACK RIVER,CSX

NASHUA-HUDSON TL, Hillsborough, NH

Built 1973 Load: 27.1 t ADT: 72,003

TOWN HOUSE ROAD

Good

Over: GEER BROOK

3.75 MI. FROM JCT. 12-A, Sullivan, NH

Built 1981 Load: 27.1 t ADT: 632

US 4

Good

Over: CSX

1.5 MI. FROM JCT. RTE 108, Strafford, NH

Built 1966 Load: 27.3 t ADT: 11,281

MAIN STREET

Good

Over: MASCOMA RIVER

.3 MI. SW FROM INV RTE 40, Grafton, NH

Built 1954 Load: 27.6 t ADT: 1,331

NH113

Good

Over: BEARCAMP RIVER

0.9 MI E SANDWICH TL, Carroll, NH

Built 1972 Load: 27.8 t ADT: 764

NH 25

Good

Over: GROTON HOLLOW BROOK

5.5 WENTWORTH T.L., Grafton, NH

Built 1965 Load: 27.8 t ADT: 6,486

PAGE ROAD

Good

Over: NORTH BRANCH

0.4 MI. BENTON TL, Grafton, NH

Built 2016 Load: 27.9 t ADT: 90

NH 11

Good

Over: GUNSTOCK RIVER

2.6 MI NE LACONIA TL, Belknap, NH

Built 1958 Load: 28.1 t ADT: 7,205

NH 16

Good

Over: ELLIS RIVER

5.6 MI FROM BARTLETT TL, Carroll, NH

Built 1933 Load: 28.1 t ADT: 3,513

NH113A

Good

Over: WONALANCET RIVER

1.6 MI FROM SANDWICH TL, Carroll, NH

Built 1966 Load: 28.1 t ADT: 251

DORCHESTER ROAD

Good

Over: GRANT BROOK

1.3 MI FROM JCT RTE 10, Grafton, NH

Built 1963 Load: 28.1 t ADT: 624

NH140

Good

Over: TIOGA RIVER

0.1 MI W BELMONT TL, Merrimack, NH

Built 1968 Load: 28.1 t ADT: 9,060

VILLAGE ROAD

Good

Over: CASCADE BROOK

0.43MI NH11, Merrimack, NH

Built 1935 Load: 28.1 t ADT: 323

US 4

Good

Over: NH108

.7 MI FROM MADBURY T.L., Strafford, NH

Built 1966 Load: 28.1 t ADT: 10,308

NH 43

Good

Over: LAMPREY RIVER

0.1 MI FROM JCT RTE 107, Rockingham, NH

Built 1938 Load: 28.4 t ADT: 4,915

NH112,KANCAMAGUS

Good

Over: LEDGE BROOK

4.0 MI E. LINCOLN T.L., Grafton, NH

Built 1953 Load: 28.6 t ADT: 5,273

NH 4A

Good

Over: KIMPTON BROOK

1.9 MI FROM ANDOVER TL, Merrimack, NH

Built 1955 Load: 28.6 t ADT: 534

BEAR NOTCH ROAD

Good

Over: DOUGLAS BROOK

2.4 MI N. JCT 112, Carroll, NH

Built 1964 Load: 28.8 t ADT: 975

NH111A

Good

Over: BEAVER BROOK

.43 MI N PELHAM VILLAGE, Hillsborough, NH

Built 1966 Load: 28.8 t ADT: 6,239

NH108

Good

Over: POWWOW RIVER

0.1 MI FROM JCT RTE 107A, Rockingham, NH

Built 1926 Load: 28.8 t ADT: 2,096

NH 16,SP TPK

Good

Over: BRANCH RIVER

0.8 MI S. OF WAKEFIELD TL, Strafford, NH

Built 1981 Load: 28.9 t ADT: 14,303

US202

Good

Over: RICKERS BROOK

0.6 MI JCT RTE 16, Strafford, NH

Built 1939 Load: 28.9 t ADT: 7,782

NH 25

Good

Over: OUTLET LOON POND

1.5 MI E NH-ME STATE LINE, Carroll, NH

Built 1941 Load: 29.0 t ADT: 3,402

ARCH STREET

Good

Over: BLACK BROOK

2.3 MI NE FROM JCT NH 9, Cheshire, NH

Built 1992 Load: 29.0 t ADT: 2,913

NO DATA ENTERED

Good

Over: EASTSIDE TRIB 1

NO DATA ENTERED, Grafton, NH

Built 2015 Load: 29.2 t ADT: 10

NH113

Good

Over: BEARCAMP RIVER

JCT NH113/OLD NH 25, Carroll, NH

Built 2018 Load: 29.4 t ADT: 2,230

NH 32

Good

Over: MARTIN BROOK

1.61 MI S SWANZEY TL, Cheshire, NH

Built 1970 Load: 29.6 t ADT: 1,617

I-93 NB

Good

Over: NH132

3.0 MI FROM MEREDITH TL, Belknap, NH

Built 1963 Load: 29.7 t ADT: 10,714

PAYNE ROAD

Good

Over: RECREATION TRAIL(RR BED)

0.1 MI JCT US 4, Grafton, NH

Built 1946 Load: 29.8 t ADT: 182

LANGFORD ROAD

Good

Over: LAMPREY RIVER

0.2 MI SW JCT 101, Rockingham, NH

Built 1964 Load: 29.8 t ADT: 1,227

COOLIDGE WOODS RD

Good

Over: PRESCOTT BROOK

0.13 MI FR BLAKE HILL RD, Belknap, NH

Built 1920 Load: 29.9 t ADT: 90

NH153

Good

Over: STONY BROOK

0.2 MI S MADISON TL, Carroll, NH

Built 1929 Load: 29.9 t ADT: 2,701

US 2

Good

Over: RECREATIONAL TRAIL

1.4 MI RANDOLPH TL, Coos, NH

Built 1960 Load: 29.9 t ADT: 5,144

I-93 SB

Good

Over: MAD RIVER

4.2 MI PLYMOUTH TL, Grafton, NH

Built 1968 Load: 29.9 t ADT: 9,903

I-93 NB

Good

Over: MAD RIVER

4.4 MI PLYMOUTH TL, Grafton, NH

Built 1968 Load: 29.9 t ADT: 9,864

THRASHER ROAD

Good

Over: BLOW-ME-DOWN BROOK

0.2 MI FROM PLAINFIELD T, Sullivan, NH

Built 1996 Load: 29.9 t ADT: 90

NH175

Good

Over: PEMIGEWASSET RIVER

0.5 MI EAST JCT US 3, Grafton, NH

Built 1976 Load: 30.0 t ADT: 672

N DORCHESTER ROAD

Good

Over: ROCKY BROOK

1.8 MI WENTWORTH TL, Grafton, NH

Built 1975 Load: 30.2 t ADT: 44

Showing 1,351-1,400 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.