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

BARTON ROAD

Good

Over: EASTMAN BROOK

50FT. RTE.25C, Grafton, NH

Built 2011 Load: 56.8 t ADT: 90

NH 12A

Good

Over: BLOW-ME-DOWN BROOK

1.6MI. FROM PLAINFIELD TL, Sullivan, NH

Built 1959 Load: 57.0 t ADT: 2,737

STEVENS ROAD

Good

Over: MINK BROOK

1.3 MI N LEBANON TL, Grafton, NH

Built 1973 Load: 57.1 t ADT: 90

NH 16

Good

Over: PINE RIVER

2.8 MI FROM WAKEFIELD TL, Carroll, NH

Built 1976 Load: 57.2 t ADT: 7,426

NEW HEBRON ROAD

Good

Over: CLAY BROOK

0.3 MI FROM TEXAS RD., Grafton, NH

Built 2002 Load: 57.2 t ADT: 189

HORACE GREELEY RD

Good

Over: PULPIT BROOK

0.1 MI BEDFORD TL, Hillsborough, NH

Built 2018 Load: 57.2 t ADT: 776

COHAS AVENUE

Good

Over: COHAS BROOK

0.8 MI S ISLAND POND RD, Hillsborough, NH

Built 1900 Load: 57.2 t ADT: 2,502

NH 3A

Good

Over: WILDLIFE STREAM

0.1 MI. SOUTH OF MAAR, Hillsborough, NH

Built 2011 Load: 57.2 t ADT: 10,060

I-95 NB

Good

Over: WOODBURY AVENUE

E. SP TPKE I-95 INTERCH., Rockingham, NH

Built 1970 Load: 57.2 t ADT: 33,905

BRACKETT ROAD

Good

Over: BERRY BROOK

.07 MI. SW JCT. 1-A, Rockingham, NH

Built 1986 Load: 57.2 t ADT: 1,635

US302

Good

Over: NANCY BROOK

8.3 MI CARROLL TL, Carroll, NH

Built 1978 Load: 57.8 t ADT: 2,768

MILLER POND ROAD

Good

Over: SKINNER BROOK

TOWN RD, Sullivan, NH

Built 1964 Load: 57.8 t ADT: 90

STINSON LAKE ROAD

Good

Over: SUCKER BROOK

.06 MI. N. OF RUMNEY TL, Grafton, NH

Built 1900 Load: 58.0 t ADT: 253

RIVERSIDE DRIVE

Good

Over: STONY BROOK

.21 MI. FROM JCT. US 4, Grafton, NH

Built 1997 Load: 58.0 t ADT: 1,683

I-93 NB

Good

Over: EASTMAN BROOK

2.51 MI THORNTON TL, Grafton, NH

Built 1972 Load: 58.0 t ADT: 6,913

OLD TEMPLE ROAD

Good

Over: STONY BROOK

1.6 MI FR TEMPLE TL, Hillsborough, NH

Built 2005 Load: 58.0 t ADT: 206

RUSSELL STATION RD

Good

Over: RAND BROOK

1.9MI LYNDEBORO TL, Hillsborough, NH

Built 2011 Load: 58.1 t ADT: 119

SPUR ROAD

Good

Over: STRATFORD BOG BROOK

0.4 MI N JCT US 3, Coos, NH

Built 1984 Load: 58.2 t ADT: 116

RUSSELL HILL ROAD

Good

Over: BLOOD BROOK

ADJACENT TO 101, Hillsborough, NH

Built 2003 Load: 58.2 t ADT: 90

I-95 SB

Good

Over: WOODBURY AVENUE

E SP. TPKE-I-95 INTERCH., Rockingham, NH

Built 1970 Load: 58.3 t ADT: 35,081

US 4

Good

Over: TEWKSBURY POND OUTLET

2.0 MI SE ORANGE TL, Grafton, NH

Built 1928 Load: 58.4 t ADT: 1,822

NUTE ROAD

Good

Over: BELLAMY RIVER

0.4 BARRINGTON TL, Strafford, NH

Built 2022 Load: 58.4 t ADT: 165

NH 13

Good

Over: WEST BRANCH BELA BROOK

0.1 MI FROM DUNBARTON TL, Merrimack, NH

Built 1940 Load: 58.6 t ADT: 7,247

DAVIS ROAD

Good

Over: SMITH RIVER

95FT. RTE 4, Grafton, NH

Built 2011 Load: 58.8 t ADT: 328

NH112,LOST RIV RD

Good

Over: WILD AMMONOOSUC RIVER

2.05 MI SE EASTON TL, Grafton, NH

Built 1995 Load: 58.8 t ADT: 1,652

I-93 SB OFF RAMP

Good

Over: RECREATION TRAIL

1.5MI S MANCHESTER T/L, Rockingham, NH

Built 2009 Load: 58.8 t ADT: 7,939

OLD CHESHIRE CO RD

Good

Over: SPRING BROOK

0.1 MI E UNITY SPRINGS RD, Sullivan, NH

Built 2013 Load: 58.8 t ADT: 90

US 3

Good

Over: PERRY STREAM OVERFLOW

5.0 MI EAST NH145, Coos, NH

Built 1996 Load: 59.0 t ADT: 1,847

ARCHERTOWN ROAD

Good

Over: ARCHERTOWN BROOK

0.7 MI FR HIGH BRIDGE RD, Grafton, NH

Built 2014 Load: 59.0 t ADT: 232

NH109

Good

Over: SMITH RIVER

3.5 MI SE TUFTONBORO TL, Carroll, NH

Built 1900 Load: 59.1 t ADT: 7,249

TINKER ROAD

Good

Over: PENNICHUCK RESERVOIR

AT NASHUA TL, Hillsborough, NH

Built 1999 Load: 59.1 t ADT: 3,531

CHUBBUCK ROAD

Good

Over: RIDDLE BROOK

.5 MI WEST OF WALLACE RD, Hillsborough, NH

Built 2013 Load: 59.3 t ADT: 538

MAGAZINE STREET

Good

Over: RIDDLE BROOK

0.4 MI SOUTH WALLACE RD, Hillsborough, NH

Built 2013 Load: 59.3 t ADT: 538

WILLOW STREET

Good

Over: BEAVER BROOK

0.27 MI. RTE. 30, Hillsborough, NH

Built 2019 Load: 59.5 t ADT: 5,349

US 3

Good

Over: NHRR

2.02 MI S. MEREDITH T/L, Belknap, NH

Built 1933 Load: 59.6 t ADT: 13,478

NH101

Good

Over: MINNEWAWA BROOK

2.8 MI FM HARRISVILLE TL, Cheshire, NH

Built 1986 Load: 59.6 t ADT: 7,893

NO DATA ENTERED

Good

Over: LIVERMORE TRIB 1

NO DATA ENTERED, Grafton, NH

Built 2013 Load: 59.6 t ADT: 50

MILL STREET

Good

Over: CONWAY LAKE OUTLET

0.8 MI FR US RTE 302, Carroll, NH

Built 1940 Load: 59.8 t ADT: 1,613

HIGHLAND STREET

Good

Over: JEWETT BROOK

.08MiFrRte 11A-GilfordAve, Belknap, NH

Built 1989 Load: 59.9 t ADT: 2,659

NH113A

Good

Over: SWIFT RIVER

4.5 MI FROM SANDWICH TL, Carroll, NH

Built 1956 Load: 60.0 t ADT: 351

RIVERDALE ROAD

Good

Over: MID BR PISCATAQUOG RIVER

65 FT FR GREGG MILL ROAD, Hillsborough, NH

Built 2015 Load: 60.1 t ADT: 199

NH 26

Good

Over: CLEAR STREAM

0.05 MI FROM ERROL TL, Coos, NH

Built 1926 Load: 60.2 t ADT: 971

RANDALL ROAD

Good

Over: BRYANT BROOK

0.02 MI FROM WEST RD, Merrimack, NH

Built 1930 Load: 60.2 t ADT: 90

NH101

Good

Over: HOWE RESERVOIR

1.9MI E MARLBORO T.L., Cheshire, NH

Built 1980 Load: 60.4 t ADT: 6,087

I-393,US 4,US202W

Good

Over: HORSE CORNER ROAD

0.01 MI W NH 9, Merrimack, NH

Built 1988 Load: 60.4 t ADT: 7,980

CAMP GROUND ROAD

Good

Over: PLEASANT STREAM

1.01MI NH 4A, Merrimack, NH

Built 2004 Load: 60.4 t ADT: 368

NH101

Good

Over: PULPIT BROOK

.1 MILE FROM AMHERST TL, Hillsborough, NH

Built 2023 Load: 60.5 t ADT: 17,501

NH116

Good

Over: REEL BROOK

3.4 MI S FRANCONIA T.L., Grafton, NH

Built 1928 Load: 60.6 t ADT: 404

I-93 NB

Good

Over: EUSTIS HILL ROAD

0.6 MI BETHLEHEM TL, Grafton, NH

Built 1959 Load: 60.8 t ADT: 4,172

NH149

Good

Over: PISCATAQUOG RIVER

0.21 MI. SW WEARE TL, Hillsborough, NH

Built 1939 Load: 60.8 t ADT: 1,449

Showing 2,201-2,250 of 2,542 bridges

Related

All states → | National rankings → | Understanding conditions → | SD bridges explained →
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.