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

NORTH RIVER ROAD

Good

Over: SOUHEGAN RIVER

300 FT. JCT 101, Hillsborough, NH

Built 1992 Load: 37.9 t ADT: 6,598

US 1

Good

Over: PISCATAQUA RIVER

NH-MAINE SL, Rockingham, NH

Built 1921 Load: 37.9 t ADT: 9,258

OLD CONCORD ROAD

Good

Over: GRANITE LAKE OUTLET

0.4 MI FROM NELSON TL, Cheshire, NH

Built 1932 Load: 38.0 t ADT: 180

NH112

Good

Over: PINE BEND BROOK

1.0 MI NW WATERVILLE T.L., Grafton, NH

Built 1948 Load: 38.0 t ADT: 5,273

MILL ROAD

Good

Over: BEARCAMP RIVER

0.08 MI. RTE.25, Carroll, NH

Built 1930 Load: 38.1 t ADT: 20

FARR ROAD

Good

Over: CATSBANE BROOK

TOWN RD, Cheshire, NH

Built 1955 Load: 38.1 t ADT: 90

NH 25C

Good

Over: EASTMAN BROOK

2.25 MI. FROM JCT. NH 10, Grafton, NH

Built 1965 Load: 38.1 t ADT: 679

STEELE ROAD

Good

Over: NUBANUSIT BROOK

70 FT FR BRIGGS ST NO 23, Hillsborough, NH

Built 2000 Load: 38.1 t ADT: 90

MAIN STREET

Good

Over: LAMPREY RIVER

0.4 Mi Fr.NH Rte.27&107, Rockingham, NH

Built 1999 Load: 38.1 t ADT: 3,248

NH137

Good

Over: NUBANUSIT BROOK

1.24 MI. NW DUBLIN TL, Cheshire, NH

Built 1970 Load: 38.2 t ADT: 1,751

NH 49

Good

Over: HIGH BROOK

2.4 MI. NE THORNTON TL, Grafton, NH

Built 1967 Load: 38.2 t ADT: 2,043

NH126

Good

Over: SUNCOOK RIVER

3.5 MI FROM STRAFFORD TL, Belknap, NH

Built 1929 Load: 38.3 t ADT: 3,634

NH 16,NH 25

Good

Over: RELIEF BEARCAMP RIVER

2.3 MI S TAMWORTH T/L, Carroll, NH

Built 2021 Load: 38.4 t ADT: 11,527

NH 28

Good

Over: COFFIN BROOK

3.0 MI N OF BARNSTEAD TL, Belknap, NH

Built 1930 Load: 38.6 t ADT: 7,376

WHITTIER ROAD

Good

Over: STONY BROOK

5.7 MI E TAMWORTH TL, Carroll, NH

Built 2016 Load: 38.6 t ADT: 441

NH101 EB

Good

Over: MAIN STREET

4.2MI E OF CANDIA TL, Rockingham, NH

Built 1982 Load: 38.6 t ADT: 20,902

OLDE FARMS ROAD

Good

Over: SKINNER BROOK

0.06MI. RTE 10, Sullivan, NH

Built 2015 Load: 38.6 t ADT: 90

COOLIDGE WOODS RD

Good

Over: BLAKE BROOK

85 FEET FR BROOK ROAD, Belknap, NH

Built 1940 Load: 38.7 t ADT: 90

SCULPTURED ROCKS R

Good

Over: ATWELL BROOK

TOWN RD, Grafton, NH

Built 2018 Load: 38.7 t ADT: 74

RED FOX CROSSING

Good

Over: NELSON BROOK

TOWN ROAD, Hillsborough, NH

Built 2021 Load: 38.7 t ADT: 100

KINGS HIGHWAY

Good

Over: KENNEDY BROOK

1.4 miles N jct NH123, Cheshire, NH

Built 2021 Load: 38.8 t ADT: 90

INGERSON ROAD

Good

Over: PRISCILLA BROOK

1 MI FROM US 2 WEST END, Coos, NH

Built 2015 Load: 38.8 t ADT: 90

ANTRIM ROAD

Good

Over: MILL TAIL RACE

0.15 MI FR CONTOOCOOK VA, Hillsborough, NH

Built 1988 Load: 38.8 t ADT: 2,291

NH152

Good

Over: NORTH RIVER

.3MI FROM JCT. RTE. 156, Rockingham, NH

Built 1970 Load: 38.8 t ADT: 3,415

NO DATA ENTERED

Good

Over: SO. BR. GALE RIVER

MAP 19, Grafton, NH

Built 2011 Load: 38.9 t ADT: 99

NO DATA ENTERED

Good

Over: SO. BR. GALE RIVER

MAP 19, Grafton, NH

Built 2011 Load: 38.9 t ADT: 50

BOG ROAD

Good

Over: SAND BROOK

0.58 MI N GOULD POND JCT, Hillsborough, NH

Built 2015 Load: 38.9 t ADT: 90

NORTH ROAD

Good

Over: GARLAND BROOK

0.54 MI W JEFFERSON TL, Coos, NH

Built 1960 Load: 39.0 t ADT: 505

I-93 SB

Good

Over: HARVARD BROOK

2.4 MI NO WOODSTOCK TL, Grafton, NH

Built 1984 Load: 39.0 t ADT: 5,020

US302,NH 10,NH 18

Good

Over: AMMONOOSUC RIVER

3.9 MI LISBON TL, Grafton, NH

Built 1950 Load: 39.0 t ADT: 7,749

NH 18,NH116

Good

Over: INDIAN CREEK

0.80 MILE S. BETH. TL., Grafton, NH

Built 2017 Load: 39.0 t ADT: 1,214

WESTVILLE ROAD

Good

Over: LITTLE RIVER

0.6 MI. RTE.125, Rockingham, NH

Built 2019 Load: 39.0 t ADT: 3,740

CHAPMAN ROAD

Good

Over: PATTERSON BROOK

1 mi west US 3, Belknap, NH

Built 2019 Load: 39.2 t ADT: 90

NH 25,NH 3A

Good

Over: BAKER RIVER

2.7 MI RUMNEY TL, Grafton, NH

Built 1968 Load: 39.2 t ADT: 13,460

FDR 53

Good

Over: W.BR MAD RIVER

MAP 38, Grafton, NH

Built 1998 Load: 39.2 t ADT: 99

NO DATA ENTERED

Good

Over: SCARFACE BROOK

MAP 19, Grafton, NH

Built 2011 Load: 39.2 t ADT: 99

BEARD ROAD

Good

Over: BEARDS BROOK

0.8 MI FR NH RTE 9, Hillsborough, NH

Built 1965 Load: 39.2 t ADT: 456

NH116

Good

Over: ISRAEL RIVER

1.2 MI SW JCT US 2, Coos, NH

Built 1987 Load: 39.4 t ADT: 1,029

BROOKVIEW DRIVE

Good

Over: BEAVER BROOK

HOOKSETT, Merrimack, NH

Built 2017 Load: 39.4 t ADT: 538

NH 9,NH236

Good

Over: SALMON FALLS RIVER

MAINE S.L., Strafford, NH

Built 1962 Load: 39.4 t ADT: 13,156

NH113

Good

Over: COLD RIVER

2.3 MI E NO. SANDWICH VIL, Carroll, NH

Built 1958 Load: 39.6 t ADT: 536

NH 12

Good

Over: S BRANCH ASHUELOT RIVER

1.6 MI S TO TROY CENTER, Cheshire, NH

Built 1941 Load: 39.6 t ADT: 8,843

CASCADE FLATS

Good

Over: TINKER BROOK

2 10th m. fr NH16 S. END, Coos, NH

Built 2018 Load: 39.6 t ADT: 480

MAIN STREET

Good

Over: MASCOMA RIVER

.87 MI. FROM JCT. RTE. 4A, Grafton, NH

Built 2003 Load: 39.8 t ADT: 1,331

SHAKER HILL ROAD

Good

Over: MASCOMA RIVER

100 FT SW JCT INV RTE. 50, Grafton, NH

Built 2003 Load: 39.8 t ADT: 1,921

NO DATA ENTERED

Good

Over: EAST BRANCH SACO RIVER

NO DATA ENTERED, Carroll, NH

Built 2014 Load: 39.9 t ADT: 100

GEORGIANA FALLS RD

Good

Over: HANSON BROOK

2.0 MI FROM WOODSTOCK TL, Grafton, NH

Built 1984 Load: 39.9 t ADT: 90

NH136

Good

Over: S BR PISCATAQUOG RIVER

2.6 MI FROM NEW BOSTON TL, Hillsborough, NH

Built 1967 Load: 39.9 t ADT: 1,500

NH111

Good

Over: EXETER RIVER

0.6 MI FROM BRENTWOOD TL, Rockingham, NH

Built 1933 Load: 39.9 t ADT: 4,570

NORTH/SOUTH, LOCAL

Good

Over: ARTIST FALLS BROOK

At Artists Falls Brook, Carroll, NH

Built 1930 Load: 40.2 t ADT: 8,886

Showing 1,601-1,650 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.