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

PERKINS POND ROAD

Good

Over: PEACOCK BROOK

100 yds south jct NH149, Hillsborough, NH

Built 1998 Load: 49.4 t ADT: 90

NORTH SHORE ROAD

Good

Over: TAYLOR BROOK

2 TNS N. ISLAND POND RD, Rockingham, NH

Built 2020 Load: 49.4 t ADT: 446

MILL POND ROAD

Good

Over: LITTLE RIVER

0.4 LEE TL, Rockingham, NH

Built 2009 Load: 49.4 t ADT: 919

NH 75

Good

Over: MAD RIVER

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

Built 1900 Load: 49.4 t ADT: 858

BRIDGE STREET

Good

Over: COCHECO RIVER

0.03MI RTE 202A, Strafford, NH

Built 1920 Load: 49.4 t ADT: 1,261

AYERS POND ROAD

Good

Over: WOODWARD BROOK

0.7 MI FR EAST WASH. RD, Sullivan, NH

Built 2020 Load: 49.4 t ADT: 90

LOON COVE ROAD

Good

Over: WATSON BROOK

200 FT EAST NH 11, Belknap, NH

Built 2022 Load: 49.5 t ADT: 90

SECOND NH TPK

Good

Over: S BR PISCATAQUOG RIVER

1.72MI. RTE 47, Hillsborough, NH

Built 2014 Load: 49.5 t ADT: 1,214

RIVER ROAD

Good

Over: CSX

1.4 MI FROM HOOKSETT TL, Merrimack, NH

Built 1989 Load: 49.6 t ADT: 639

NH101 EB

Good

Over: PISCASSIC RIVER

1.1MI E NH101/NH125 JCT, Rockingham, NH

Built 1997 Load: 49.6 t ADT: 20,167

NH101

Good

Over: LITTLE RIVER

EXETER, Rockingham, NH

Built 2000 Load: 49.6 t ADT: 41,682

LINDEN STREET

Good

Over: LITTLE RIVER

0.39MI. RTE 111, Rockingham, NH

Built 2015 Load: 49.6 t ADT: 2,854

NH109

Good

Over: MELVIN RIVER

6.5 MI FROM WOLFEBORO TL, Carroll, NH

Built 1921 Load: 49.9 t ADT: 2,119

GOOSE POND ROAD

Good

Over: GOOSE POND BROOK

3.8 MI FROM HANOVER TL, Grafton, NH

Built 2014 Load: 49.9 t ADT: 815

US 4

Good

Over: NHRR(ABD)

3.8 MI FROM ORANGE TL, Grafton, NH

Built 1941 Load: 49.9 t ADT: 1,822

RESERVOIR DRIVE

Good

Over: PISCATAQUOG RIVER

73 FT FR PAIGE HILL ROAD, Hillsborough, NH

Built 1993 Load: 49.9 t ADT: 2,002

NH101 EB

Good

Over: OLD CANDIA ROAD

.85 MI.E. OF CHESTER TPK, Rockingham, NH

Built 1985 Load: 49.9 t ADT: 25,607

NH101 WB

Good

Over: OLD CANDIA ROAD

.09 MI. EAST OF B&MRR, Rockingham, NH

Built 1985 Load: 49.9 t ADT: 25,607

GOVERNORS ROAD

Good

Over: CHURCHILL BROOK

0.2 MI S JCT 109, Carroll, NH

Built 1940 Load: 50.0 t ADT: 90

NH 9

Good

Over: ASH SWAMP BROOK

3.2 MI E WESTMORELAND TL, Cheshire, NH

Built 2006 Load: 50.0 t ADT: 22,086

FORDWAY ROAD

Good

Over: BEAVER BROOK

0.4MI. NH102, Rockingham, NH

Built 2010 Load: 50.0 t ADT: 6,133

I-93 NB ON RAMP

Good

Over: RECREATION TRAIL

1.5MI S Manchester T/L, Rockingham, NH

Built 2009 Load: 50.1 t ADT: 12,714

US302

Good

Over: ALBANY BROOK

1.0 MI FROM HARTS LOC. TL, Carroll, NH

Built 1928 Load: 50.2 t ADT: 2,719

US302

Good

Over: STONY BROOK

0.3 MI FROM BARTLETT TL, Carroll, NH

Built 1939 Load: 50.2 t ADT: 2,768

DAVIS PLACE

Good

Over: JEWETT BROOK

472 FT FR UNION AVE&US3, Belknap, NH

Built 2006 Load: 50.3 t ADT: 199

NH123

Good

Over: COLD RIVER

1.34MI SE VT SL, Cheshire, NH

Built 2008 Load: 50.3 t ADT: 2,763

US 2,US 3

Good

Over: ISRAEL RIVER

4.6 MI FROM WHITEFIELD TL, Coos, NH

Built 1990 Load: 50.3 t ADT: 9,084

DUFOUR ROAD

Good

Over: S BRANCH BAKER RIVER

0.19MI NH25, Grafton, NH

Built 1981 Load: 50.3 t ADT: 90

WOODWARD HILL ROAD

Good

Over: BRENNAN BROOK

TOWN RD, Hillsborough, NH

Built 2015 Load: 50.3 t ADT: 90

PARADISE ROAD

Good

Over: WENDELL BROOK

170 FT. SUNAPEE TL, Sullivan, NH

Built 1998 Load: 50.3 t ADT: 1,350

STONE ROAD

Good

Over: AYERS BROOK

4.32MI. RTE 107, Belknap, NH

Built 1999 Load: 50.4 t ADT: 90

RIVER ROAD

Good

Over: HEWES BROOK

1.2 MI. TL HANOVER, Grafton, NH

Built 2020 Load: 50.4 t ADT: 282

WATER STREET

Good

Over: BEAVER BROOK

0.33 MI FROM MAIN ST, Cheshire, NH

Built 2001 Load: 50.5 t ADT: 2,557

OLD COUNTRY ROAD

Good

Over: WATERLOOM POND OUTLET

340 FT FR RIVER RD, Hillsborough, NH

Built 2005 Load: 50.5 t ADT: 90

TILTON BRIDGE ROAD

Good

Over: SALMON BROOK

0.21 MI. RTE. 127, Belknap, NH

Built 1900 Load: 50.6 t ADT: 90

NH153

Good

Over: OSSIPEE RIVER

0.1 MI N JCT RTE 25, Carroll, NH

Built 1956 Load: 50.6 t ADT: 3,541

I-93 NB

Good

Over: NHRR

4.6 MI PLYMOUTH TL, Grafton, NH

Built 1968 Load: 50.6 t ADT: 9,864

BRALEY ROAD

Good

Over: COCKERMOUTH RIVER

0.16 MI FR WEST SHORE RD, Grafton, NH

Built 2009 Load: 50.6 t ADT: 60

MOUNTAIN ROAD

Good

Over: BLACKWATER RIVER

TOWN RD 0.94 MI ANDOVER, Merrimack, NH

Built 2010 Load: 50.6 t ADT: 90

NH121

Good

Over: LITTLE RIVER,CSX

0.5 MI FROM JCT RTE 125, Rockingham, NH

Built 2006 Load: 50.6 t ADT: 10,556

NH 16,SP TPK

Good

Over: NH 16 CONNECTOR

2.5 MI S OF MILTON TL, Strafford, NH

Built 1978 Load: 50.6 t ADT: 23,219

ROLLINS ROAD

Good

Over: MAIN STREET,CSX

1.0 MI FROM JCT NH 4, Strafford, NH

Built 2000 Load: 50.6 t ADT: 3,508

SPRING STREET

Good

Over: ELA RIVER

0.37 RTE 11, Strafford, NH

Built 1998 Load: 50.7 t ADT: 759

NH 16

Good

Over: ELLIS RIVER

0.7 MI FROM JACKSON TL, Carroll, NH

Built 1990 Load: 50.8 t ADT: 9,125

WEST STREET

Good

Over: CALIFORNIA BROOK

0.41MI RTE 10, Cheshire, NH

Built 2005 Load: 50.8 t ADT: 262

BOHANNON BRIDGE RD

Good

Over: NISSITISSIT RIVER

0.99 MI FROM MASS. SL, Hillsborough, NH

Built 1940 Load: 50.8 t ADT: 574

NH114

Good

Over: AMEY BROOK

1.17 M. SE WARNER TL, Merrimack, NH

Built 1951 Load: 50.8 t ADT: 3,984

CRAWLEY FALLS ROAD

Good

Over: EXETER RIVER

1.6 MI FROM KINGSTON TL, Rockingham, NH

Built 2014 Load: 50.8 t ADT: 546

SANDOWN ROAD

Good

Over: EXETER RIVER

130FT RTE 107, Rockingham, NH

Built 1998 Load: 50.8 t ADT: 2,168

I-95 SB

Good

Over: TAYLOR RIVER

3.75 MI N of MA S/L, Rockingham, NH

Built 2018 Load: 50.8 t ADT: 42,489

Showing 2,051-2,100 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.