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

I-93 NB

Good

Over: HANSON BROOK

1.9 MI NORTH WOODSTOCK T, Grafton, NH

Built 1985 Load: 45.4 t ADT: 5,814

WIRE ROAD

Good

Over: BABOOSIC BROOK

0.3 MI FR BEDFORD TL, Hillsborough, NH

Built 2013 Load: 45.4 t ADT: 2,355

US 3,FEE TPK SB

Good

Over: CANAL,SERVICE ROAD

0.5 MI FROM NH 130, Hillsborough, NH

Built 1959 Load: 45.4 t ADT: 56,671

GULF ROAD

Good

Over: OTTER BROOK

0.12 MI FROM NH RTE 136, Hillsborough, NH

Built 1940 Load: 45.4 t ADT: 166

CROSS MILL ROAD

Good

Over: WINNIPESAUKEE RIVER

AT NORTHFIELD-FRANKLIN T, Merrimack, NH

Built 1988 Load: 45.4 t ADT: 2,550

NH 87

Good

Over: LAMPREY RIVER

1.2 MI. SE JCT NH 125, Rockingham, NH

Built 2004 Load: 45.4 t ADT: 2,629

NH 27(EXETER RD)

Good

Over: CSX(ABD)

3.8 MI E. EXET-HAMP T.L., Rockingham, NH

Built 1926 Load: 45.5 t ADT: 10,849

NH123A

Good

Over: COLD RIVER

.42 MI. FROM LANGDON TL, Sullivan, NH

Built 1961 Load: 45.5 t ADT: 1,214

NH123A

Good

Over: COLD RIVER

4.16 MI. FROM LANGDON TL, Sullivan, NH

Built 1961 Load: 45.5 t ADT: 411

OAK STREET

Good

Over: SUGAR RIVER

0.4 MI FR NO. NEWPORT RD, Sullivan, NH

Built 2019 Load: 45.5 t ADT: 640

HENRY BRIDGE ROAD

Good

Over: HARRY BROOK

TOWN RD, Hillsborough, NH

Built 2008 Load: 45.6 t ADT: 6,725

BLUFF STREET EXT

Good

Over: WIDOW HARRIS BROOK

500 FEET FROM TOWN FARM R, Rockingham, NH

Built 2020 Load: 45.6 t ADT: 3,511

MILL STREET

Good

Over: AMMONOOSUC RAIL TRAIL

0.15 MI FR MONT BELLO ST, Grafton, NH

Built 2018 Load: 45.7 t ADT: 87

US 3

Good

Over: SOUCOOK RIVER

PEMBROKE T.L., Merrimack, NH

Built 1953 Load: 45.7 t ADT: 12,820

NH125

Good

Over: CSX

.8 MI FROM JCT NH121, Rockingham, NH

Built 1992 Load: 45.7 t ADT: 22,573

GOODWIN ROAD

Good

Over: GUNSTOCK RIVER

0.4 MI FR HOYT ROAD, Belknap, NH

Built 1940 Load: 45.9 t ADT: 317

NH 10

Good

Over: ASHUELOT RIVER

0.2 MI FROM SWANZEY TL, Cheshire, NH

Built 2014 Load: 45.9 t ADT: 7,174

NH 16,SP TPK

Good

Over: US202

.6 MI FROM JCT RT 202A, Strafford, NH

Built 2011 Load: 45.9 t ADT: 54,657

BEDFORD ROAD

Good

Over: BABOOSIC BROOK

0.7 MI FR BEDFORD TL, Hillsborough, NH

Built 2008 Load: 46.0 t ADT: 2,319

MAGAZINE STREET

Good

Over: RIDDLE BROOK

0.2 MI FROM JCKSN SQ, Hillsborough, NH

Built 2013 Load: 46.1 t ADT: 538

MAIN STREET

Good

Over: SUNCOOK RIVER

ALLENSTOWN TL, Merrimack, NH

Built 2005 Load: 46.1 t ADT: 4,191

NH 16 SB

Good

Over: DEAD RIVER

1.5 MI N OF GORHAM TL, Coos, NH

Built 1931 Load: 46.2 t ADT: 4,199

NH 26

Good

Over: MOHAWK RIVER

2 MI W DIXVILLE TL, Coos, NH

Built 2007 Load: 46.2 t ADT: 917

I-93 SB

Good

Over: SKOOKUMCHUCK BROOK

4 MI N LINCOLN T.L., Grafton, NH

Built 1987 Load: 46.2 t ADT: 5,017

NH 1A

Good

Over: RYE HARBOR

2.7 MI FROM N HAMPTON TL, Rockingham, NH

Built 1986 Load: 46.2 t ADT: 2,678

WASHINGTON STREET

Good

Over: COCHECO RIVER

0.1 MI S NH 9, Strafford, NH

Built 2010 Load: 46.2 t ADT: 528

US 4

Good

Over: CRYSTAL LAKE BROOK

0.6 MI FROM ENFIELD TL, Grafton, NH

Built 1941 Load: 46.3 t ADT: 7,483

HOYT ROAD

Good

Over: GUNSTOCK RIVER

2.5 MI FROM GUNSTOCK HIL, Belknap, NH

Built 2007 Load: 46.4 t ADT: 578

NH119

Good

Over: ASHUELOT RIVER

.1 MI. FROM JCT. NH 10, Cheshire, NH

Built 1962 Load: 46.4 t ADT: 3,594

VERRY BROOK ROAD

Good

Over: WHEELOCK BROOK

0.8 MI FR SWANZEY TL, Cheshire, NH

Built 2007 Load: 46.4 t ADT: 90

LYNDEBOROUGH ROAD

Good

Over: MEADOW BROOK

.2 NORTH OF 084/077, Hillsborough, NH

Built 2023 Load: 46.4 t ADT: 422

BREEZY HILL ROAD

Good

Over: WARNER RIVER

1.8 MI FROM WARNER TL, Merrimack, NH

Built 2016 Load: 46.4 t ADT: 90

NH 16,SP TPK SB

Good

Over: COCHECO RIVER

0.2 MI N JCT RT 11, Strafford, NH

Built 2012 Load: 46.4 t ADT: 8,922

NH 16,SP TPK NB

Good

Over: COCHECO RIVER

1.2 MI FROM JCT RT 16, Strafford, NH

Built 2012 Load: 46.4 t ADT: 13,180

BROOK STREET

Good

Over: CATSBANE BROOK

0.38 MI. NW JCT. NH 9, Cheshire, NH

Built 1950 Load: 46.5 t ADT: 554

US 3,FEE TPK SB

Good

Over: NASHUA RIVER

0.2 MI FROM SERVICE RD, Hillsborough, NH

Built 1959 Load: 46.5 t ADT: 68,668

FREMONT ROAD

Good

Over: EXETER RIVER

1.3MI. FREMONT TL, Rockingham, NH

Built 1988 Load: 46.5 t ADT: 801

NH101 EB

Good

Over: LAMPREY RIVER

4.7MI E OF CANDIA TL, Rockingham, NH

Built 1983 Load: 46.5 t ADT: 20,902

US202,NH 16,SP TPK

Good

Over: NH202A (WALNUT STREET)

1.0 MI FROM JCT RT 11, Strafford, NH

Built 1957 Load: 46.5 t ADT: 20,334

NH 16,SP TPK

Good

Over: COCHECO RIVER

1.0 MI FROM RT 16, Strafford, NH

Built 2010 Load: 46.5 t ADT: 25,146

NH123

Good

Over: WARREN BROOK

3.16 MI. SE JCT. NH 123-A, Cheshire, NH

Built 2006 Load: 46.6 t ADT: 1,253

CHARCOAL ROAD

Good

Over: CHARCOAL BROOK

0.7 MI. RTE 101, Cheshire, NH

Built 2016 Load: 46.6 t ADT: 90

SARGENT HILL ROAD

Good

Over: SMITH RIVER

0.67 MI. DANBURY TL, Grafton, NH

Built 2003 Load: 46.7 t ADT: 90

OLD GREENFIELD RD

Good

Over: BOGLIE BROOK

2.05 MI FR GREENFIELD TL, Hillsborough, NH

Built 2008 Load: 46.7 t ADT: 313

NEW BOSTON ROAD

Good

Over: POWWOW RIVER

0.6 MI FR NH RTE 117, Rockingham, NH

Built 2009 Load: 46.7 t ADT: 2,235

HIGH STREET

Good

Over: NORTH RIVER

0.6 MI. TL EPPING, Strafford, NH

Built 2012 Load: 46.7 t ADT: 161

RIVER ROAD

Good

Over: SUNCOOK RIVER

.8 MI. FROM N.H. RTE.140, Belknap, NH

Built 2004 Load: 46.8 t ADT: 90

PLEASANT VALLEY RD

Good

Over: OTTER BROOK

AT LOST NATION INV. 51, Coos, NH

Built 2004 Load: 46.8 t ADT: 90

NH114

Good

Over: STOCKER BROOK

.1 MI. EAST OF JCT. NH 10, Sullivan, NH

Built 1941 Load: 46.8 t ADT: 1,519

NH112,LOST RIV RD

Good

Over: BLACK BROOK

0.8 MI N.W.WOODSTOCK T.L., Grafton, NH

Built 2004 Load: 46.9 t ADT: 1,652

Showing 1,901-1,950 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.