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

PARIS ROAD

Good

Over: UPPER AMMONOOSUC RIVER

217 FT FR NH110, Coos, NH

Built 2000 Load: 41.7 t ADT: 148

I-93 SB ON RAMP

Good

Over: NHRR

0.1 MI FROM NH 3A & 25, Grafton, NH

Built 1964 Load: 41.7 t ADT: 3,423

NH 49

Good

Over: SMARTS BROOK

0.6 MI W OF WATERVILLE TL, Grafton, NH

Built 1977 Load: 41.7 t ADT: 2,786

US 4

Good

Over: BELLAMY RIVER

0.1 MI FROM JCT RTE 16, Strafford, NH

Built 1998 Load: 41.7 t ADT: 15,934

NH123

Good

Over: WARREN BROOK

1.0 MI SE JCT NH 123A, Cheshire, NH

Built 2008 Load: 41.8 t ADT: 1,253

KNOWLES HILL ROAD

Good

Over: BROCK BROOK

3.8 MI FROM SHIN VALLEY, Grafton, NH

Built 1935 Load: 41.8 t ADT: 90

NH 10

Good

Over: BEAN BROOK

0.5 MI FROM ORFORD TL, Grafton, NH

Built 2000 Load: 41.8 t ADT: 1,223

I-293,FEE TPK RAMP

Good

Over: S BR PISCATAQUOG RIVER

0.7 MI BEDFORD T.L., Hillsborough, NH

Built 1957 Load: 41.8 t ADT: 4,781

BUNKER HILL ROAD

Good

Over: NEEDLE SHOP BROOK

2.1 MI FR, Merrimack, NH

Built 1960 Load: 41.8 t ADT: 110

KINGSTON ROAD

Good

Over: CSX

1.1 MI S KINGSTON TL, Rockingham, NH

Built 2004 Load: 41.8 t ADT: 4,814

NH125

Good

Over: NHNCRR

1.9 MI FROM ROCHESTER TL, Strafford, NH

Built 1954 Load: 41.8 t ADT: 7,310

NH113

Good

Over: MILL BROOK

0.5 MI FROM NH 25, Carroll, NH

Built 1987 Load: 42.0 t ADT: 2,216

CENTER HILL ROAD

Good

Over: BLAKES BROOK

0.3MI NH9, Merrimack, NH

Built 2008 Load: 42.0 t ADT: 833

LOVERS LANE

Good

Over: NECRR

.34 MI JCT N.H.12, Sullivan, NH

Built 1996 Load: 42.0 t ADT: 4,540

SOUTH SLACK RD

Good

Over: LITTLE SUGAR RIVER

1.4 MI FROM ACWORTH TL, Sullivan, NH

Built 1991 Load: 42.0 t ADT: 90

US 3,NH 11

Good

Over: NH107

1.5 MI FROM BELMONT T.L., Belknap, NH

Built 1963 Load: 42.1 t ADT: 8,703

NH113

Good

Over: BEARCAMP RIVER

2.6 MI FROM RTE 109, Carroll, NH

Built 1927 Load: 42.1 t ADT: 705

FITCH ROAD

Good

Over: CONTOOCOOK RIVER

200 FT FR US202, Cheshire, NH

Built 1970 Load: 42.1 t ADT: 321

WEST MEADOW ROAD

Good

Over: HOYT BROOK

2.7 MI FROM WASHINGTON T, Merrimack, NH

Built 2009 Load: 42.1 t ADT: 90

TOWLE FARM ROAD

Good

Over: TAYLOR RIVER

AT HAMPTON FALLS TL, Rockingham, NH

Built 1977 Load: 42.1 t ADT: 2,192

NH108

Good

Over: SQUAMSCOTT RIVER

NEWFIELDS-STRATHAM TL, Rockingham, NH

Built 2001 Load: 42.1 t ADT: 13,535

POTTER ROAD

Good

Over: CONWAY LAKE INLET

1.2 MI. RTE 153, Carroll, NH

Built 2009 Load: 42.2 t ADT: 90

US 3

Good

Over: BISHOP BROOK

0.1 MI CLARKSVILLE TL, Coos, NH

Built 1924 Load: 42.2 t ADT: 1,802

MAIN STREET

Good

Over: BAKER RIVER

0.4 MI N JCT RTE 25, Grafton, NH

Built 1998 Load: 42.2 t ADT: 1,603

NH 16

Good

Over: CLEAR STREAM

0.1 MI SW OF RTE 26, Coos, NH

Built 1997 Load: 42.3 t ADT: 842

BIRCHDALE ROAD

Good

Over: BELA BROOK

0.23 MI SE JCT NH 13, Merrimack, NH

Built 2021 Load: 42.3 t ADT: 459

NH106

Good

Over: SOUCOOK RIVER

PEMBROKE TL, Merrimack, NH

Built 1996 Load: 42.3 t ADT: 9,421

NH111

Good

Over: WETLAND 41

WINDHAM, Rockingham, NH

Built 2007 Load: 42.3 t ADT: 18,189

US202,NH 16,SP TPK

Good

Over: TEN ROD ROAD

.4MI FROM JCT RT 11, Strafford, NH

Built 2012 Load: 42.3 t ADT: 20,334

BURTON HIGHWAY

Good

Over: MILL BROOK

TOWN RD, Hillsborough, NH

Built 2002 Load: 42.4 t ADT: 242

NH 9

Good

Over: N BR CONTOOCOOK RIVER

0.1 MI NE TO ANTRIM T/L, Cheshire, NH

Built 1999 Load: 42.5 t ADT: 5,241

RABBIT HOLLOW ROAD

Good

Over: PERRY BROOK

0.12 MI FROM LAKE RD, Cheshire, NH

Built 2020 Load: 42.5 t ADT: 90

SEARLES ROAD

Good

Over: SALMON BROOK

.2 MI W OF E DUNSTABLE RD, Hillsborough, NH

Built 1999 Load: 42.5 t ADT: 2,219

NH132

Good

Over: WINNIPESAUKEE RIVER

NORTHFIELD-TILTON TL, Merrimack, NH

Built 1960 Load: 42.5 t ADT: 4,832

PATROL SHED ROAD

Good

Over: STONY BROOK

2.01 MI N JACKSON TL, Coos, NH

Built 2011 Load: 42.6 t

BLACKWATER ROAD

Good

Over: MASCOMA RIVER

0.8 MI US 4, Grafton, NH

Built 1992 Load: 42.6 t ADT: 90

BRIDLE BRIDGE ROAD

Good

Over: BEAVER BROOK

0.4 MI. RTE. 111, Hillsborough, NH

Built 1995 Load: 42.6 t ADT: 765

LINCOLN STREET

Good

Over: GREAT BROOK

0.1 MI FR UNION ST, Hillsborough, NH

Built 1992 Load: 42.6 t ADT: 1,776

W. SALISBURY ROAD

Good

Over: BLACKWATER RIVER

4.05 MI FROM WARNER TL, Merrimack, NH

Built 1990 Load: 42.6 t ADT: 90

WARNER ROAD

Good

Over: BLACKWATER RIVER

3.06 MI FROM WARNER TL, Merrimack, NH

Built 1993 Load: 42.6 t ADT: 90

PACKERS FALLS ROAD

Good

Over: PISCASSIC RIVER

.39 MI SW DURHAM TL, Rockingham, NH

Built 1931 Load: 42.6 t ADT: 1,347

PINE HILL ROAD

Good

Over: CROYDON BRANCH SUGAR R

0.1 MI NH 10, Sullivan, NH

Built 1989 Load: 42.6 t ADT: 554

RESERVOIR ROAD

Good

Over: CLAY BROOK

.5 M F NEW HEBRON RD, Grafton, NH

Built 2007 Load: 42.7 t ADT: 433

NH 16,NH 25

Good

Over: BEARCAMP RIVER

2.5 MI S TAMWORTH T/L, Carroll, NH

Built 2021 Load: 42.8 t ADT: 11,527

SNOW ROAD

Good

Over: SOUTH RIVER

0.13 MI. RT 153, Carroll, NH

Built 2021 Load: 42.9 t ADT: 155

WHITTEN NECK ROAD

Good

Over: CRESCENT LAKE INLET

0.19 Mi.Fr. NH 28, Carroll, NH

Built 2005 Load: 42.9 t ADT: 495

CHURCH STREET

Good

Over: CONNECTICUT RIVER,NECRR

VERMONT STATE LINE, Cheshire, NH

Built 1983 Load: 42.9 t ADT: 9,216

RIVER ROAD NORTH

Good

Over: ALDRICH BROOK

0.57MI NH12, Cheshire, NH

Built 2014 Load: 42.9 t ADT: 115

I-93 NB

Good

Over: COHAS BROOK

1.6MI E JCT RT 28, Hillsborough, NH

Built 1962 Load: 42.9 t ADT: 37,900

ABIJAH BRIDGE ROAD

Good

Over: LAKE HORACE

0.5 MI FROM DEERING TL, Hillsborough, NH

Built 2009 Load: 42.9 t ADT: 90

Showing 1,751-1,800 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.