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

GRANGE ROAD

Good

Over: BURNSIDE BROOK

1.87 MI SW NORTHUMBERLAND, Coos, NH

Built 1984 Load: 48.2 t ADT: 1,214

I-93 SB

Good

Over: WALLACE HILL ROAD

3.4 MI TO RTE 141, Grafton, NH

Built 1959 Load: 48.2 t ADT: 2,362

I-93 NB

Good

Over: WALLACE HILL ROAD

3.4 MI JCT RTE 141, Grafton, NH

Built 1973 Load: 48.2 t ADT: 2,282

MORSE ROAD

Good

Over: SANBORN MILL BROOK

300m south of NH 3A, Grafton, NH

Built 2004 Load: 48.2 t ADT: 90

TURKEY HILL ROAD

Good

Over: SOUHEGAN RIVER

AT NH DOT URBAN LINE, Hillsborough, NH

Built 1969 Load: 48.2 t ADT: 9,215

FEE TPK

Good

Over: SOUHEGAN RIVER

0.8 MI FROM BABOOSIC RD, Hillsborough, NH

Built 1953 Load: 48.2 t ADT: 73,393

STANIELS ROAD

Good

Over: SOUCOOK RIVER

0.7 MI FR CHICHESTER TL, Merrimack, NH

Built 2001 Load: 48.2 t ADT: 90

REED ROAD

Good

Over: WEST ALTON BROOK

0.9 GILFORD TL, Belknap, NH

Built 2011 Load: 48.3 t ADT: 90

NO DATA ENTERED

Good

Over: LIVERMORE TRIB 2

NO DATA ENTERED, Grafton, NH

Built 2013 Load: 48.3 t ADT: 50

US 3

Good

Over: INDIAN STREAM

2.5 MI N OF CLARKSVILLETL, Coos, NH

Built 1976 Load: 48.4 t ADT: 1,406

FOWLER RIVER ROAD

Good

Over: BOG BROOK

0.1 MI FROM BRISTOL TL, Grafton, NH

Built 1927 Load: 48.4 t ADT: 1,113

NH116

Good

Over: GALE RIVER

4.4 MI N. EASTON T.L., Grafton, NH

Built 1992 Load: 48.4 t ADT: 2,272

I-393,US 4,US202E

Good

Over: SOUCOOK RIVER

CONCORD PEMBROOK TL, Merrimack, NH

Built 1988 Load: 48.4 t ADT: 8,657

NORTH ROAD

Good

Over: NH101

0.5 MI WEST JCT NH 27, Rockingham, NH

Built 1992 Load: 48.4 t ADT: 3,503

STAGE ROAD

Good

Over: LITTLE SUGAR RIVER

1.5 MI. CHARLESTOWN TL, Sullivan, NH

Built 2008 Load: 48.4 t ADT: 90

PERCY ROAD

Good

Over: STRATFORD BOG BROOK

220 FT FROM BOG ROAD 50, Coos, NH

Built 2002 Load: 48.5 t ADT: 90

I-89,NH 10 SB

Good

Over: NHRR(ABD)

2.1MI FROM ENFIELD T.L., Grafton, NH

Built 1966 Load: 48.5 t ADT: 16,350

NH 28

Good

Over: TRIBUTARY G

200' S OF BRADFORD ST, Rockingham, NH

Built 2015 Load: 48.6 t ADT: 10,443

CASTLE HILL ROAD

Good

Over: BEAVER BROOK

0.02 MI FR PELHAM TL, Rockingham, NH

Built 2021 Load: 48.6 t ADT: 273

DEPOT STREET

Good

Over: RELIEF

0.2MI BENNINGTON TL, Hillsborough, NH

Built 1914 Load: 48.7 t ADT: 985

US 3,WATER ST

Good

Over: CSX

0.3 MI WEST OF JCT I-93, Merrimack, NH

Built 2000 Load: 48.8 t ADT: 20,082

NH 12

Good

Over: BRANCH RIVER

1.0 MI FROM KEENE CENTER, Cheshire, NH

Built 1994 Load: 49.0 t ADT: 19,665

NH 26

Good

Over: MOHAWK RIVER

8MI EAST OF JCT US3, Coos, NH

Built 2007 Load: 49.0 t ADT: 917

AIRPORT ROAD

Good

Over: AIRPORT MARSH OUTLET

0.6 MI FR NH RTE 116, Coos, NH

Built 2009 Load: 49.0 t ADT: 549

BERRY ROAD

Good

Over: SMITH RIVER

.25 MI EAST NH 104, Grafton, NH

Built 2005 Load: 49.0 t ADT: 271

RIVER STREET

Good

Over: SQUAM RIVER

100 FT FR NH RTE 25, Grafton, NH

Built 1941 Load: 49.0 t ADT: 90

NH175A

Good

Over: PEMIGEWASSET RIVER

0.1 MI E JCT US 3, Grafton, NH

Built 2006 Load: 49.0 t ADT: 7,511

NH120

Good

Over: GREAT BROOK

2.2 MI FROM PLAINFIELD TL, Grafton, NH

Built 1944 Load: 49.0 t ADT: 2,619

NH118

Good

Over: BERRY BROOK

.1 MI. FROM JCT. NH 25, Grafton, NH

Built 1950 Load: 49.0 t ADT: 1,127

PLEASANT POND ROAD

Good

Over: PISCATAQUOG RIVER

0.9MI. FRANCESTOWN TL, Hillsborough, NH

Built 1939 Load: 49.0 t ADT: 90

RIDGE ROAD

Good

Over: SALMON BROOK

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

Built 1998 Load: 49.0 t ADT: 4,766

WEBSTER HIGHWAY

Good

Over: WHITING BROOK

0.30MI WILTON TL, Hillsborough, NH

Built 2000 Load: 49.0 t ADT: 181

TWIN BRIDGE ROAD

Good

Over: MID BR PISCATAQUOG RIVER

0.3 MI FR NEW BOSTON TL, Hillsborough, NH

Built 1999 Load: 49.0 t ADT: 90

DYERS CROSSING RD

Good

Over: SUCKER BROOK

0.05 MI NH 11, Merrimack, NH

Built 2005 Load: 49.0 t ADT: 102

ROBY ROAD

Good

Over: LANE RIVER

1.2 MI. WARNER TL, Merrimack, NH

Built 2002 Load: 49.0 t ADT: 321

PINE ROAD

Good

Over: LITTLE RIVER

.3 mi s jct old 101, Rockingham, NH

Built 1998 Load: 49.0 t ADT: 187

NH 87

Good

Over: LAMPREY RIVER OVERFLOW

1.25 MI SE JCT NH 125, Rockingham, NH

Built 2004 Load: 49.0 t ADT: 2,629

NH101 EB, RAMP

Good

Over: CSX

0.2 MI E JCT NH 85, Rockingham, NH

Built 1998 Load: 49.0 t ADT: 25,332

NH101 EB

Good

Over: SQUAMSCOTT RIVER

At Stratham Town Line, Rockingham, NH

Built 1998 Load: 49.0 t ADT: 23,758

NH101 WB

Good

Over: SQUAMSCOTT RIVER

0.3 MI E JCT NH 85, Rockingham, NH

Built 1994 Load: 49.0 t ADT: 23,375

OLD MILL BROOK RD

Good

Over: MILL BROOK

0.16MI NH12, Cheshire, NH

Built 2005 Load: 49.2 t ADT: 90

LOUDON RIDGE ROAD

Good

Over: ACADEMY BROOK

0.4 MI FR LOWERRIDGE RD, Merrimack, NH

Built 2023 Load: 49.2 t ADT: 278

NH101 WB

Good

Over: BLOODY BROOK

0.3MI W NH 27 OVERPASS, Rockingham, NH

Built 1998 Load: 49.2 t ADT: 23,041

NH 16,SP TPK RAMP

Good

Over: COCHECO RIVER

SB OFFRAMP OVER COCHECO, Strafford, NH

Built 2012 Load: 49.2 t ADT: 2,820

BRIDGE STREET

Good

Over: BRANCH RIVER

0.27MI. RTE 153, Carroll, NH

Built 2001 Load: 49.3 t ADT: 154

NH 11

Good

Over: NHRR(ABD)

1.4 MILES FROM WILMOT T/L, Merrimack, NH

Built 2010 Load: 49.3 t ADT: 5,505

NH123A

Good

Over: WARREN BROOK

0.40 MI SW LANGDON TL, Cheshire, NH

Built 2020 Load: 49.4 t ADT: 1,092

NORTH STREET

Good

Over: MILLERS RIVER

0.5 MI. RTE.119, Cheshire, NH

Built 2003 Load: 49.4 t ADT: 400

NH 26

Good

Over: AKERS POND BROOK

1.0 MI W OF ERROL VILLAGE, Coos, NH

Built 1960 Load: 49.4 t ADT: 971

I-93 SB

Good

Over: HARVARD BROOK

2.1 MI.NO.WOODSTOCK T/L, Grafton, NH

Built 1985 Load: 49.4 t ADT: 5,711

Showing 2,001-2,050 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.