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

CHURCH ROAD

Good

Over: CHASE BROOK

0.19 MI FR WEST UNITY IN, Sullivan, NH

Built 2012 Load: 40.2 t ADT: 90

CANAL ROAD

Good

Over: GREAT EAST LAKE OUTLET

TOWN RD MAINE SL, Carroll, NH

Built 1920 Load: 40.4 t ADT: 867

YOUNG MOUNTAIN RD

Good

Over: COLD RIVER

160 FT FROM NH113A, Carroll, NH

Built 2018 Load: 40.5 t ADT: 90

OLD WESTPORT ROAD

Good

Over: WHEELOCK BROOK

1.4 Mi.Fr Old Spofford RD, Cheshire, NH

Built 2011 Load: 40.5 t ADT: 335

TOWN ROAD #100

Good

Over: ARCHERTOWN BROOK

0.1 MI FR MILLER ROAD, Grafton, NH

Built 2021 Load: 40.5 t ADT: 90

KEARSARGE VAL RD

Good

Over: CASCADE BROOK

0.43MI NH11, Merrimack, NH

Built 2008 Load: 40.5 t ADT: 1,214

NH 25

Good

Over: OSSIPEE RIVER

3.1 MI FROM OSSIPEE T.L., Carroll, NH

Built 2004 Load: 40.6 t ADT: 3,402

MCGAW BRIDGE ROAD

Good

Over: BABOOSIC BROOK

0.13 MI FR WIRE ROAD, Hillsborough, NH

Built 2016 Load: 40.7 t ADT: 1,358

BOW LAKE ROAD

Good

Over: SHERBURNE BROOK

0.75 STRAFFORD TL, Rockingham, NH

Built 2021 Load: 40.7 t ADT: 652

TOM BERRY ROAD

Good

Over: BIG RIVER

0.56 MI FR STRAFFORD TL, Belknap, NH

Built 1930 Load: 40.8 t ADT: 90

SOUTH ROAD

Good

Over: BELMONT RIVER

6.2 MI FROM LACONIA TL, Belknap, NH

Built 1988 Load: 40.8 t ADT: 859

HOUNSELL AVENUE

Good

Over: JEWETT BROOK

0.1 MI SOUTH NH11A, Belknap, NH

Built 2005 Load: 40.8 t ADT: 480

BLACK BROOK ROAD

Good

Over: BLACK BROOK

0.1 MI FROM LOWER BAY RD, Belknap, NH

Built 2013 Load: 40.8 t ADT: 90

US302

Good

Over: NHRR(CONWAY SCENIC LINE)

2.1 MI SW JCT NH 16, Carroll, NH

Built 2008 Load: 40.8 t ADT: 5,300

US302

Good

Over: SACO RIVER

1.7 MI SW OF RTE 16, Carroll, NH

Built 2008 Load: 40.8 t ADT: 5,300

GRANITE ROAD

Good

Over: PINE RIVER

0.5 MI E JCT RTE 16, Carroll, NH

Built 2004 Load: 40.8 t ADT: 90

HADLEY ROAD

Good

Over: CONTOOCOOK RIVER

at Pierce Crossing Bridge, Cheshire, NH

Built 2003 Load: 40.8 t ADT: 90

SOUTH VILLAGE ROAD

Good

Over: MILL BROOK

0.02MI. RTE 12, Cheshire, NH

Built 2015 Load: 40.8 t ADT: 1,077

JOSIE ROAD

Good

Over: MOHAWK RIVER

2.8 MI FROM DIXVILLE TL, Coos, NH

Built 1986 Load: 40.8 t ADT: 90

US 2,NH 16

Good

Over: MOOSE RIVER

5.1 MI FROM MARTINS LOC., Coos, NH

Built 1939 Load: 40.8 t ADT: 10,303

US 3

Good

Over: UPPER AMMONOOSUC RIVER

4.4 MI FROM LANCASTER TL, Coos, NH

Built 1995 Load: 40.8 t ADT: 5,358

BELL HILL ROAD

Good

Over: UPPER AMMONOOSUC RIVER

.06 MI FROM NH110, Coos, NH

Built 1990 Load: 40.8 t ADT: 90

DEWEY HILL ROAD

Good

Over: PHILLIPS BROOK

0.5 MI FR DUMMER TL, Coos, NH

Built 1996 Load: 40.8 t ADT: 43

BROOK ROAD

Good

Over: BROCK BROOK

0.8 MI FR SHIN VALLEY RD, Grafton, NH

Built 2004 Load: 40.8 t ADT: 74

US302,NH 10

Good

Over: NHRR(ABD)

1.6 MI. FROM HAVERHILL TL, Grafton, NH

Built 1990 Load: 40.8 t ADT: 4,815

I-93 NB

Good

Over: OWL STREET

0.7 MI THORNTON TL, Grafton, NH

Built 1968 Load: 40.8 t ADT: 7,387

I-93 NB

Good

Over: NH 49

1.4MI FROM THORNTON TL, Grafton, NH

Built 1968 Load: 40.8 t ADT: 7,387

PRESCOTT HILL ROAD

Good

Over: SMITH RIVER

0.09 MI. RTE 4, Grafton, NH

Built 1997 Load: 40.8 t ADT: 605

MILLBROOK ROAD

Good

Over: MILL BROOK

2.11 MI. ORANGE TL, Grafton, NH

Built 1991 Load: 40.8 t ADT: 90

CLARK POND ROAD

Good

Over: CLARK BROOK

500' S. OF WOODWARD RD, Grafton, NH

Built 2020 Load: 40.8 t ADT: 90

TRUE'S BROOK ROAD

Good

Over: BLOODS BROOK

0.9 MI FR PLAINFIELD TL, Grafton, NH

Built 2008 Load: 40.8 t ADT: 1,068

BEACON STREET

Good

Over: AMMONOOSUC RIVER

0.03 MI FROM NH RTE 116, Grafton, NH

Built 2000 Load: 40.8 t ADT: 306

MOUNTAIN MEADOWS R

Good

Over: OGONTZ BROOK

0.12 MI FR LISBON TL, Grafton, NH

Built 2017 Load: 40.8 t ADT: 90

NH 10

Good

Over: HEWES BROOK

0.5 MI FROM HANOVER TL, Grafton, NH

Built 1966 Load: 40.8 t ADT: 2,281

NH 10

Good

Over: GRANT BROOK

3.1 MI FROM HANOVER TL, Grafton, NH

Built 1958 Load: 40.8 t ADT: 2,837

STINSON LAKE ROAD

Good

Over: STINSON BROOK

3.2 MI N OF JCT RTE 25, Grafton, NH

Built 1948 Load: 40.8 t ADT: 840

I-93 SB

Good

Over: MERRILL ACCESS RD

3.9 MI CAMPTON TL, Grafton, NH

Built 1969 Load: 40.8 t ADT: 7,156

I-93 NB

Good

Over: MERRILL ACCESS RD

3.8 MI CAMPTON TL, Grafton, NH

Built 1969 Load: 40.8 t ADT: 6,997

THAYER MTN ROAD

Good

Over: S BRANCH BAKER RIVER

.09 MI FR NO DORCHESTER, Grafton, NH

Built 1999 Load: 40.8 t ADT: 90

LOVEREN MILL RD

Good

Over: NORTH BRANCH RIVER

185 FT RTE 9, Hillsborough, NH

Built 1992 Load: 40.8 t ADT: 90

TANNERY HILL ROAD

Good

Over: FERGUSON BROOK

0.5 MI FROM MIDDLE ROAD, Hillsborough, NH

Built 2002 Load: 40.8 t ADT: 223

NEW SEARLES ROAD

Good

Over: SALMON BROOK

0.2 MI W OF E DUNSTABLE, Hillsborough, NH

Built 1999 Load: 40.8 t ADT: 2,003

CIRCUMFERENTIAL EB

Good

Over: MERRIMACK RIVER,CSX

NASHUA-HUDSON TL, Hillsborough, NH

Built 2000 Load: 40.8 t ADT: 42,986

CASTLE HILL ROAD

Good

Over: BEAVER BROOK

WINDHAM TL, Hillsborough, NH

Built 2009 Load: 40.8 t ADT: 273

ABIJAH BRIDGE ROAD

Good

Over: DUDLEY BROOK

0.11 MI FROM DEERING TL, Hillsborough, NH

Built 1999 Load: 40.8 t ADT: 90

KEYES HILL ROAD

Good

Over: BLOOD BROOK

0.58MI TEMPLE TL, Hillsborough, NH

Built 1999 Load: 40.8 t ADT: 186

US 3

Good

Over: SUNCOOK RIVER,BUCK ST

PEMBROKE-ALLENSTOWN TL, Merrimack, NH

Built 2007 Load: 40.8 t ADT: 9,099

DUNKLEE ROAD

Good

Over: BOW BOG BROOK

0.16 MI FROM RTE 3-A, Merrimack, NH

Built 2006 Load: 40.8 t ADT: 2,123

WASHINGTON STREET

Good

Over: MILL OUTLET

0.4MI. US3, Merrimack, NH

Built 1988 Load: 40.8 t ADT: 2,781

ISLAND ROAD

Good

Over: CANAL INLET

185 FT FROM FISKE RD, Merrimack, NH

Built 1988 Load: 40.8 t ADT: 96

Showing 1,651-1,700 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.