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: NHRR

0.3 MI HOLDERNESS TL, Grafton, NH

Built 1964 Load: 44.1 t ADT: 11,292

WEST ROAD

Good

Over: HOYT BROOK

6.6 MI FROM WARNER TL, Merrimack, NH

Built 2010 Load: 44.1 t ADT: 1,214

ECHO VALLEY FARM R

Good

Over: GRIFFIN BROOK

TOWN RD, Merrimack, NH

Built 2017 Load: 44.1 t ADT: 90

JENNISON ROAD

Good

Over: HARTSHORN BROOK

1.1 MI FR MT VERNON TL, Hillsborough, NH

Built 2015 Load: 44.2 t ADT: 1,414

POLLARDS MILLS RD

Good

Over: SO BR SUGAR RIVER

0.8 MI RTE 10, Sullivan, NH

Built 2003 Load: 44.2 t ADT: 662

VALLEY ROAD

Good

Over: ISRAEL RIVER

0.66 MI WEST OF JCT US 2, Coos, NH

Built 1986 Load: 44.3 t ADT: 142

NH 25

Good

Over: OLIVERIAN BROOK

3.6 MI FROM BENTON TL, Grafton, NH

Built 1999 Load: 44.3 t ADT: 977

NH 28 BYPASS

Good

Over: LAKE MASSABESIC

2.0 MI JCT RT 121, Rockingham, NH

Built 2001 Load: 44.3 t ADT: 7,016

OLD TOWN ROAD

Good

Over: AMMONOOSUC RIVER

1.6 MI FROM BETHLEHEM TL, Coos, NH

Built 1915 Load: 44.4 t ADT: 90

TALLANT ROAD

Good

Over: BEAVER BROOK

261 FT. RTE. 111, Hillsborough, NH

Built 2006 Load: 44.4 t ADT: 2,457

ROBERTS ROAD

Good

Over: SNOW BROOK

TOWN RD, Carroll, NH

Built 2016 Load: 44.5 t ADT: 90

US 2

Good

Over: MOOSE RIVER

5.8 MI FROM JEFFERSON TL, Coos, NH

Built 1966 Load: 44.5 t ADT: 5,144

MEADOW ROAD

Good

Over: ANDROSCOGGIN RIVER

0.43 MI NE JCT US 2, Coos, NH

Built 1984 Load: 44.5 t ADT: 155

I-93 SB

Good

Over: COLLINS ST,SQUAM RIVER

.08 MI NEW HAMPTON T.L., Grafton, NH

Built 1963 Load: 44.5 t ADT: 10,717

I-93 NB

Good

Over: COLLINS ST,SQUAM RIVER

.07 MI NEW HAMPTON T.L., Grafton, NH

Built 1963 Load: 44.5 t ADT: 10,714

GROTON ROAD

Good

Over: TANNERY BROOK

2.7 MI FROM BRISTOL TL, Grafton, NH

Built 1984 Load: 44.5 t ADT: 822

I-93 SB

Good

Over: HANSON BROOK

3.4 MI NO WOODSTOCK TL, Grafton, NH

Built 1984 Load: 44.5 t ADT: 5,020

NH 28 BYPASS

Good

Over: BEAVER BROOK

4.0 MI S AUBURN TL, Rockingham, NH

Built 1996 Load: 44.5 t ADT: 12,422

NH101E WINNACUNNET

Good

Over: EEL CREEK

.2 MI WEST JCT NH 1A, Rockingham, NH

Built 1997 Load: 44.5 t ADT: 3,814

NH108

Good

Over: BELLAMY RIVER

1.6 MI FROM MADBURY TL, Strafford, NH

Built 1986 Load: 44.5 t ADT: 15,932

US202,NH 11,SP TPK

Good

Over: RECREATION TRAIL

2.8 MI S OF MILTON TL, Strafford, NH

Built 1978 Load: 44.5 t ADT: 15,051

NH 11,NH103

Good

Over: SUGAR RIVER

5.2 MI FROM CLAREMONT TL, Sullivan, NH

Built 1985 Load: 44.5 t ADT: 15,541

LONG ISLAND ROAD

Good

Over: LAKE WINNIPESAUKEE

4.1 MI FROM HANSON RD, Carroll, NH

Built 1988 Load: 44.7 t ADT: 1,219

FDR 13

Good

Over: COLD BROOK

MAP 02, Coos, NH

Built 2006 Load: 44.7 t ADT: 99

WOODLAND LANE

Good

Over: WHITNEY BROOK

175 FT. FROM VILLAGE ROA, Merrimack, NH

Built 1988 Load: 44.7 t ADT: 90

NH125

Good

Over: LAMPREY RIVER

0.7 MI FROM JCT RTE 101, Rockingham, NH

Built 1991 Load: 44.7 t ADT: 17,277

US 4,NH 16,SP TPK

Good

Over: GOSLING ROAD

1.2 MI N JCT I-95, Rockingham, NH

Built 1993 Load: 44.7 t ADT: 58,550

INNOVATION DRIVE

Good

Over: NHNCRR

0.3 MILES FROM JCT NH108, Strafford, NH

Built 2013 Load: 44.7 t ADT: 187

NH120

Good

Over: REDWATER BROOK

0.04 MI FROM CLAREMONT TL, Sullivan, NH

Built 1956 Load: 44.7 t ADT: 2,266

COON BROOK ROAD

Good

Over: SO BR SUGAR RIVER

390 FT FROM NH 10, Sullivan, NH

Built 1960 Load: 44.7 t ADT: 90

US302

Good

Over: AVALANCHE BROOK

3.5 MI CARROLL TL, Carroll, NH

Built 1960 Load: 44.9 t ADT: 2,100

US 2

Good

Over: CONNECTICUT RIVER

AT VERMONT STATE LINE, Coos, NH

Built 2020 Load: 44.9 t ADT: 3,802

NH118

Good

Over: INDIAN RIVER

1.3 MI FROM DORCHESTER TL, Grafton, NH

Built 1950 Load: 44.9 t ADT: 1,408

I-93(RAMP 3N-F)

Good

Over: US 3

3.7 MI FROM WOODSTOCK TL, Grafton, NH

Built 1986 Load: 44.9 t ADT: 396

COVERED BRIDGE RD

Good

Over: MILL BROOK

OFF MILL BROOK ROAD, Grafton, NH

Built 2018 Load: 44.9 t ADT: 90

NH 12A

Good

Over: OX BROOK

1.0 MI NW JCT 12 AND 12A, Sullivan, NH

Built 2002 Load: 44.9 t ADT: 1,438

NH 26

Good

Over: RECREATION TRAIL

.3 M E OF COLEBROOK T/L, Coos, NH

Built 2017 Load: 45.0 t ADT: 917

NH128

Good

Over: BEAVER BROOK

WINDHAM T.L., Rockingham, NH

Built 1934 Load: 45.1 t ADT: 8,944

LAFAYETTE CAMP ENT

Good

Over: PEMIGEWASSET RIVER

0.15 MIFR FRANCONIA TL, Grafton, NH

Built 1999 Load: 45.2 t ADT: 100

NH 31

Good

Over: SOUHEGAN RIVER

0.1 MI. FROM JCT. NH 101, Hillsborough, NH

Built 1971 Load: 45.2 t ADT: 1,896

DANA HILL ROAD

Good

Over: NHRR

450 FEET FR WINONA ROAD, Belknap, NH

Built 1998 Load: 45.3 t ADT: 467

WHITAKER LANE

Good

Over: KEARSARGE BROOK

.06 MI FR BARTLET RD, Carroll, NH

Built 2000 Load: 45.3 t ADT: 90

VALLEY ROAD

Good

Over: S BRANCH ISRAEL RIVER

0.84 MI S JCT US 2, Coos, NH

Built 1979 Load: 45.3 t ADT: 90

I-93 PARKWAY

Good

Over: PED UNDERPASS

7.4MI NO WOODSTOCK T.L., Grafton, NH

Built 1985 Load: 45.3 t ADT: 11,427

US 4

Good

Over: NHRR(ABD)

3.7 MI FROM WILMOT TL, Merrimack, NH

Built 2023 Load: 45.3 t ADT: 2,454

NH153

Good

Over: COCHECO RIVER

.8 MI FROM JCT. NH 11, Strafford, NH

Built 2018 Load: 45.3 t ADT: 1,214

US302

Good

Over: ROCKY BRANCH RIVER

1.1 MI. FROM JCT. NH 16, Carroll, NH

Built 1990 Load: 45.4 t ADT: 6,003

NH 16

Good

Over: ELLIS RIVER

0.5 MI FROM BARTLETT TL, Carroll, NH

Built 1938 Load: 45.4 t ADT: 7,181

CENTRAL STREET

Good

Over: PEMIGEWASSET RIVER

AT NEW HAMPTON TL, Grafton, NH

Built 2009 Load: 45.4 t ADT: 690

PILLSBURY STREET

Good

Over: MASCOMA RIVER

0.2 MI FR SCHOOL ST, Grafton, NH

Built 1930 Load: 45.4 t ADT: 533

Showing 1,851-1,900 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.