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

MIDDLE ROAD

Good

Over: MCDOWELL RESERVOIR

.9 MI FR PETERBORO TL, Hillsborough, NH

Built 1950 Load: 19.6 t ADT: 481

STRING BRIDGE ST

Good

Over: SQUAMSCOTT RIVER

120FT RTE 108, Rockingham, NH

Built 1935 Load: 19.6 t ADT: 1,533

STRING BRIDGE ST

Good

Over: SQUAMSCOTT RIVER

0.05MI RTE 108, Rockingham, NH

Built 1935 Load: 19.6 t ADT: 1,533

SCOTT ROAD

Good

Over: CHOCORUA RIVER

0.17 MIMS NH RTE 16, Carroll, NH

Built 2023 Load: 20.0 t ADT: 90

BUFFALO ROAD

Good

Over: STEVENS BROOK

0.56MI RUMNEY TL, Grafton, NH

Built 1947 Load: 20.0 t ADT: 90

NH 1B

Good

Over: SOUTH MILL POND

.6 MI FROM JCT US 1, Rockingham, NH

Built 1985 Load: 20.0 t ADT: 5,456

TUTTLE ROAD

Good

Over: LITTLE RIVER

0.10 MI FR MAST RD, Strafford, NH

Built 1959 Load: 20.0 t ADT: 718

NH106

Good

Over: TIOGA RIVER

4.0 MI S LACONIA TL, Belknap, NH

Built 1934 Load: 20.6 t ADT: 9,975

CRYSTAL LAKE ROAD

Good

Over: NELSON BROOK

2 MI NW JCT NH140, Belknap, NH

Built 2023 Load: 20.7 t ADT: 90

BAKER STREET

Good

Over: BEAVER BROOK

1.0 MI SE FROM KEENE CTR, Cheshire, NH

Built 1978 Load: 20.8 t ADT: 1,372

RIVER ROAD

Good

Over: SACO RIVER OVERFLOW

2.0 MI FROM BARTLETT TL, Carroll, NH

Built 1955 Load: 20.9 t ADT: 4,565

NORTHSIDE ROAD

Good

Over: UPPER AMMONOOSUC RIVER

234 FT FROM NH110, Coos, NH

Built 1862 Load: 21.2 t ADT: 375

RIVER ROAD

Good

Over: S BR BAKER RIVER

.74 MI. NE JCT. NH 118, Grafton, NH

Built 1937 Load: 21.2 t ADT: 49

LYMAN ROAD

Good

Over: MILL BROOK

1.69 MI NW JCT 302, Grafton, NH

Built 1926 Load: 21.4 t ADT: 562

WOODBURY ROAD

Good

Over: PISCATAQUOG RIVER

0.3 MI FROM NH114, Hillsborough, NH

Built 1940 Load: 22.3 t ADT: 90

UNION STREET

Good

Over: NUBANUSIT BROOK

0.6 MI FROM NH RTE 101, Hillsborough, NH

Built 1937 Load: 22.4 t ADT: 1,387

NH153

Good

Over: BRANCH RIVER

3.1 MI N MILTON TL, Carroll, NH

Built 1932 Load: 22.7 t ADT: 3,739

THORNTON GORE RD

Good

Over: JOHNSON BROOK

0.9 MI FROM WOODSTOCK TL, Grafton, NH

Built 1948 Load: 22.7 t ADT: 219

EAGLE POND ROAD

Good

Over: EAGLE POND OUTLET

0.15MI ANDOVER TL, Merrimack, NH

Built 1974 Load: 22.7 t ADT: 90

SKIMOBILE ROAD

Good

Over: KEARSARGE BROOK

1.16 MI FR KEARSARGE ST, Carroll, NH

Built 1950 Load: 22.9 t ADT: 90

SHARON ROAD

Good

Over: TOWN LINE BROOK

.08 MI SE PETERBORO TL, Hillsborough, NH

Built 1970 Load: 23.2 t ADT: 251

NH121

Good

Over: SUCKER BROOK

2.5 MI FROM MANCHESTER TL, Rockingham, NH

Built 1930 Load: 23.2 t ADT: 3,066

COLBY ROAD

Good

Over: PISCATAQUOG RIVER

0.17 MI RIVER ROAD, Hillsborough, NH

Built 1962 Load: 23.3 t ADT: 667

HERMIT WOODS ROAD

Good

Over: HERMIT BROOK

0.3 MI FROM NH RTE 132, Belknap, NH

Built 2017 Load: 23.6 t ADT: 381

BRIDGE STREET

Good

Over: CONNECTICUT RIVER

VERMONT STATE LINE, Coos, NH

Built 1930 Load: 23.7 t ADT: 544

FDR 11

Good

Over: E.BR. MILL BROOK

MAP 01, Coos, NH

Built 1982 Load: 23.7 t ADT: 50

US202

Good

Over: ISINGLASS RIVER

2.8 MI SW ROCHESTER TL, Strafford, NH

Built 1934 Load: 23.7 t ADT: 6,222

MILLBROOK ROAD

Good

Over: MILL BROOK

1.28 MI S JCT 302, Grafton, NH

Built 1928 Load: 24.3 t ADT: 1,214

ANNIE NICHOLS ROAD

Good

Over: DAN HOLE RIVER

0.14 MI FR TUFTONBORO RD, Carroll, NH

Built 1994 Load: 24.5 t ADT: 90

CANADA STREET

Good

Over: MINNEWAWA BROOK

170 FT FR NH RTE 101, Cheshire, NH

Built 1955 Load: 24.5 t ADT: 480

NH 12

Good

Over: NHRR(ABD)

.8MI WESTMORELAND TL, Cheshire, NH

Built 1960 Load: 24.5 t ADT: 8,129

PLEASANT VALLEY RD

Good

Over: GREAT BROOK

0.7 MI FR GARLAND RD, Coos, NH

Built 1956 Load: 24.5 t ADT: 90

MOUSLEY BROOK ROAD

Good

Over: JACOBS BROOK

80 FT FROM ROAD INV NO.6, Grafton, NH

Built 2011 Load: 24.7 t ADT: 90

NH125

Good

Over: JONES BROOK

0.65 MI. S. WAKEFIELD TL, Strafford, NH

Built 1932 Load: 24.8 t ADT: 1,007

NH111

Good

Over: LITTLE RIVER

1.4 MI FROM JCT 101C, Rockingham, NH

Built 1930 Load: 24.9 t ADT: 6,017

SMITH RIVER ROAD

Good

Over: SMITH RIVER

.25 MI. W. OF HILL TL, Merrimack, NH

Built 1941 Load: 25.1 t ADT: 271

I-95 SB

Good

Over: CSX

0.6 MI N GREENLAND TL, Rockingham, NH

Built 1972 Load: 25.1 t ADT: 47,592

I-95 NB

Good

Over: CSX

0.6 MI N GREENLAND TL, Rockingham, NH

Built 1972 Load: 25.1 t ADT: 46,088

TARBOX LANE

Good

Over: EASTMAN BROOK

0.02 MI FR NH RTE 25C, Grafton, NH

Built 1999 Load: 25.2 t ADT: 90

SURRY MT ACCESS RD

Good

Over: SPILLWAY CHANNEL

9.65 KM NORTH OF KEENE NH, Cheshire, NH

Built 1962 Load: 25.3 t ADT: 25

MERIDEN HILL ROAD

Good

Over: LYMAN BROOK

1.3 MI FROM US RTE 3, Coos, NH

Built 1960 Load: 25.3 t ADT: 134

US 3

Good

Over: HARVARD BROOK

0.9 MI FROM WOODSTOCK TL, Grafton, NH

Built 1930 Load: 25.3 t ADT: 2,288

NH132

Good

Over: WILLIAMS BROOK

0.8 MI TILTON TL, Merrimack, NH

Built 1960 Load: 25.4 t ADT: 7,052

FARM ROAD

Good

Over: BLOW-ME-DOWN BROOK

45 FT FROM STAGE RD NO41, Sullivan, NH

Built 1940 Load: 25.4 t ADT: 90

SHORT FALLS ROAD

Good

Over: SUNCOOK RIVER

.5 MI S. JCT. RT 28, Merrimack, NH

Built 1950 Load: 25.5 t ADT: 1,505

GILES ROAD

Good

Over: CSX

1.06MI RTE 108, Rockingham, NH

Built 1920 Load: 25.5 t ADT: 504

US 3

Good

Over: SIMMS STREAM

0.5 MI SW COLEBROOK TL, Coos, NH

Built 1956 Load: 25.9 t ADT: 3,419

STAGE ROAD

Good

Over: BLOW-ME-DOWN BROOK

0.7 MI FROM JCT 12A, Sullivan, NH

Built 1961 Load: 26.1 t ADT: 1,214

US 3

Good

Over: HUBBARD BROOK

5.3 MI. FROM CAMPTON TL, Grafton, NH

Built 1971 Load: 26.3 t ADT: 1,272

SO NEW BOSTON ROAD

Good

Over: S BR PISCATAQUOG RIVER

0.67MI. NEW BOSTON TL, Hillsborough, NH

Built 2020 Load: 26.3 t ADT: 285

Showing 1,301-1,350 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.