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-89(RAMP D)

Good

Over: TURKEY RIVER

BOW INTERCHANGE, Merrimack, NH

Built 1987 Load: 46.9 t ADT: 9,929

I-89 NB

Good

Over: CONTOOCOOK RIVER

1.2 MI N.W. JCT 127, Merrimack, NH

Built 1967 Load: 46.9 t ADT: 11,367

NORTH VILLAGE ROAD

Good

Over: SILVER BROOK

3.8 MI FR HENNIKER TL, Merrimack, NH

Built 2011 Load: 46.9 t ADT: 90

PLACES MILL ROAD

Good

Over: SUNSET LAKE OUTLET

0.4 GILMANTON TL, Belknap, NH

Built 2011 Load: 47.0 t ADT: 90

JUNIPER HILL ROAD

Good

Over: BRENNAN BROOK

TOWN RD, Hillsborough, NH

Built 2015 Load: 47.0 t ADT: 90

THORNTON ROAD

Good

Over: PENNICHUCK BROOK

NASHUA/MERR TL, Hillsborough, NH

Built 2001 Load: 47.0 t ADT: 1,203

LOWER ASHBY ROAD

Good

Over: SOUHEGAN RIVER

0.2 MI FR NH RTE 123A, Hillsborough, NH

Built 2006 Load: 47.0 t ADT: 1,214

WESTERN AVE

Good

Over: CONTOOCOOK RIVER

2.7 MI FR HILLSBOROUGH T, Merrimack, NH

Built 2017 Load: 47.0 t ADT: 543

SUTTON ROAD

Good

Over: RING BROOK

0.2 MI. RTE. 103, Merrimack, NH

Built 2011 Load: 47.0 t ADT: 448

BROOKSIDE DRIVE

Good

Over: LION BROOK

600FT UPSTREAM OF 132/064, Merrimack, NH

Built 2020 Load: 47.0 t ADT: 90

STAGE ROAD

Good

Over: SUNCOOK RIVER

TOWN RD., Belknap, NH

Built 1992 Load: 47.2 t ADT: 1,155

NH 9

Good

Over: CATSBANE BROOK

2.5 MI FROM VT SL, Cheshire, NH

Built 1937 Load: 47.2 t ADT: 10,673

NH 16

Good

Over: PEABODY RIVER

3.0 MI JACKSON TL, Coos, NH

Built 1960 Load: 47.2 t ADT: 3,317

US 3

Good

Over: GALE RIVER

2.0 MI FROM FRANCONIA TL, Grafton, NH

Built 1990 Load: 47.2 t ADT: 5,754

GOOSE POND ROAD

Good

Over: GOOSE POND BROOK

2.9 MI FROM HANOVER TL, Grafton, NH

Built 1991 Load: 47.2 t ADT: 815

HORACE GREELEY RD

Good

Over: JOE ENGLISH BROOK

2.2 MI BEDFORD TL, Hillsborough, NH

Built 1989 Load: 47.2 t ADT: 2,016

WEST DEERING ROAD

Good

Over: CONTOOCOOK RIVER

ANTRIM TL, Hillsborough, NH

Built 2010 Load: 47.2 t ADT: 796

NH137

Good

Over: MOOSE BROOK

1.1 MI W JCT US202, Hillsborough, NH

Built 1939 Load: 47.2 t ADT: 1,235

MAIN STREET

Good

Over: KINGS BROOK

1.8 MI. NEWBURY TL, Merrimack, NH

Built 2007 Load: 47.2 t ADT: 874

NH101 EB

Good

Over: BLOODY BROOK

0.3MI W NH 27 OVERPASS, Rockingham, NH

Built 1998 Load: 47.2 t ADT: 21,071

CROSS ROAD

Good

Over: TOWN LINE BROOK

0.8 MI FR PETERBORO TL, Hillsborough, NH

Built 2014 Load: 47.3 t ADT: 90

NH 25

Good

Over: BEARCAMP RIVER

0.6 MI. TAMWORTH T.L., Carroll, NH

Built 2005 Load: 47.4 t ADT: 4,151

US 3

Good

Over: PERRY STREAM

5.0 MI EAST NH145, Coos, NH

Built 1996 Load: 47.4 t ADT: 1,847

GULF ROAD

Good

Over: STONY BROOK

0.5 MI FR GREENFIELD TL, Hillsborough, NH

Built 1920 Load: 47.4 t ADT: 90

NH101 WB

Good

Over: LAMPREY RIVER

.1 MI RAYMOND TL, Rockingham, NH

Built 1985 Load: 47.4 t ADT: 22,064

NH101

Good

Over: MINNEWAWA BROOK

3.0MI HARRISVILLE TL., Cheshire, NH

Built 1967 Load: 47.5 t ADT: 10,893

NH 26

Good

Over: ANDROSCOGGIN RIVER

0.2 MI EAST OF RTE 16, Coos, NH

Built 1996 Load: 47.5 t ADT: 1,073

LITTLE FALLS BR RD

Good

Over: COCHECO RIVER

0.71MI.N. NH 11, Strafford, NH

Built 1991 Load: 47.5 t ADT: 5,766

I-93 SB

Good

Over: PEMIGEWASSET RIVER

0.1 MI CAMPTON TL, Grafton, NH

Built 1969 Load: 47.6 t ADT: 7,500

I-93 NB

Good

Over: PEMIGEWASSET RIVER

0.1 MI CAMPTON TL, Grafton, NH

Built 1969 Load: 47.6 t ADT: 7,387

BROAD ST PARKWAY

Good

Over: NASHUA RIVER

0.4 MI N. of W. Hollis St, Hillsborough, NH

Built 2016 Load: 47.6 t ADT: 1,100

PEASLEE ROAD

Good

Over: PISCATAQUOG RIVER

0.12 MI FROM RIVER ROAD, Hillsborough, NH

Built 2015 Load: 47.7 t ADT: 50

NH 11

Good

Over: BLACKWATER RIVER

0.7 MI FROM WILMOT T.L., Merrimack, NH

Built 1959 Load: 47.7 t ADT: 5,505

BRADFORD ROAD

Good

Over: WENDELL BROOK

0.15 NEWPORT TL, Sullivan, NH

Built 2018 Load: 47.7 t ADT: 2,769

I-93 NB OFF RAMP

Good

Over: PEMIGEWASSET R,CLARKS RR

1.61 MI N WOODSTOCK TL, Grafton, NH

Built 1973 Load: 47.8 t ADT: 546

GRIMES HILL ROAD

Good

Over: INDIAN POND BROOK

1.05 MI. RTE. 10, Grafton, NH

Built 2016 Load: 47.8 t ADT: 90

SP TPK NB OFF RAMP

Good

Over: COCHECO RIVER

NB Off-ramp over Cocheco, Strafford, NH

Built 2010 Load: 47.8 t ADT: 1,205

US 4

Good

Over: MASCOMA RIVER

0.1 MI FROM ENFIELD TL, Grafton, NH

Built 1993 Load: 48.0 t ADT: 7,483

NH 18

Good

Over: LAFAYETTE BROOK

2.7 MI FROM Sugar Hill TL, Grafton, NH

Built 1932 Load: 48.0 t ADT: 584

NH 25,NH118

Good

Over: HURRICANE BROOK

0.8 MI FROM WENTWORTH T.L, Grafton, NH

Built 1962 Load: 48.0 t ADT: 3,654

SECOND STREET

Good

Over: PISCATAQUOG (SOUTH BR)

0.2 MI N QUEEN CITY BRDGE, Hillsborough, NH

Built 1991 Load: 48.0 t ADT: 6,373

VILLAGE ROAD

Good

Over: ANDREW BROOK

300FT. RTE. 103, Merrimack, NH

Built 2011 Load: 48.0 t ADT: 422

NH101 WB,RAMP

Good

Over: CSX

0.2 MI E JCT NH 85, Rockingham, NH

Built 1994 Load: 48.0 t ADT: 25,063

NH101 WB

Good

Over: LAMPREY RIVER

4.7MI E OF CANDIA TL, Rockingham, NH

Built 1983 Load: 48.0 t ADT: 20,577

STINSON LAKE ROAD

Good

Over: STINSON BROOK

1.4 MI S ELLSWORTH TL, Grafton, NH

Built 1936 Load: 48.1 t ADT: 410

US 3,NH 11,NH127

Good

Over: PEMIGEWASSET RIVER

2.0 MI FROM TILTON T/L, Merrimack, NH

Built 1994 Load: 48.1 t ADT: 12,136

NH 28

Good

Over: MERRYMEETING RIVER

4.7 MI FROM BARNSTEAD TL, Belknap, NH

Built 2009 Load: 48.2 t ADT: 7,376

POTTER ROAD

Good

Over: SNOW BROOK

320FT RTE 153, Carroll, NH

Built 2022 Load: 48.2 t ADT: 90

CLEVELAND HILL RD

Good

Over: MILL BROOK

0.10 MI FR SPAULDING RD5, Carroll, NH

Built 2009 Load: 48.2 t ADT: 171

ROXBURY STREET

Good

Over: BEAVER BROOK

0.21MI MAIN ST, Cheshire, NH

Built 1950 Load: 48.2 t ADT: 4,512

Showing 1,951-2,000 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.