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

NH 11

Unknown

Over: US202,NH 16,SP TPK

.8 MI FROM JCT NH202-A, Strafford, NH

Built 2011 ADT: 29,000

NH 16,SP TPK,RAMP

Unknown

Over: NH125

3.25 MI N DOVER T/L, Strafford, NH

Built 2009 ADT: 14,000

TEBBETTS ROAD

Unknown

Over: NH 16,SP TPK

1.7 MI FROM DOVER TL, Strafford, NH

Built 1957 ADT: 25,005

NH 12A

Unknown

Over: NH 12,NECRR

2.1 MI. FROM WALPOLE TL, Sullivan, NH

Built 1970 ADT: 1,900

I-89 SB

Unknown

Over: NH 10

2.1 MI FROM SPRINGFIELD T, Sullivan, NH

Built 1967 ADT: 7,200

I-89 NB

Unknown

Over: NH 10

2.1 MI FROM SPRINGFIELD T, Sullivan, NH

Built 1967 ADT: 7,200

HOWE HILL ROAD

Unknown

Over: I-89

1.4 MI SPRINGFIELD TL, Sullivan, NH

Built 1967 ADT: 17,400

I-89 NB

Unknown

Over: NH114

0.6MI FROM SPRINGFIELD TL, Sullivan, NH

Built 1967 ADT: 1,500

I-89 SB

Unknown

Over: STONEY BROOK ROAD

1.0 MI FROM SUNAPEE T.L., Sullivan, NH

Built 1967 ADT: 1,000

I-89 NB

Unknown

Over: STONEY BROOK ROAD

1.1 MI FROM SUNAPEE T.L., Sullivan, NH

Built 1967 ADT: 1,000

I-89 NB

Unknown

Over: STONEY BROOK ROAD

0.1 MI FROM SUNAPEE TL, Sullivan, NH

Built 1968 ADT: 100

I-89 SB

Unknown

Over: STONEY BROOK ROAD

AT SUNAPEE TL, Sullivan, NH

Built 1968 ADT: 100

I-89 SB

Unknown

Over: GEORGES MILLS ROAD

0.5MI FROM NEW LONDON TL, Sullivan, NH

Built 1968 ADT: 300

I-89 NB

Unknown

Over: GEORGES MILLS ROAD

0.5 FROM NEW LONDON T.L., Sullivan, NH

Built 1967 ADT: 280

NEW MARKET ROAD

Fair

Over: WARNER RIVER

0.17 MI FROM NH RTE 103, Merrimack, NH

Built 1840 Load: 1.8 t ADT: 420

MAIN STREET

Fair

Over: ASHUELOT RIVER

340 FT FROM WINCHESTER S, Cheshire, NH

Built 1832 Load: 2.7 t ADT: 2,159

RIVER ROAD

Fair

Over: CLAY BROOK

0.3 MI. TL ORFORD, Grafton, NH

Built 1885 Load: 2.9 t ADT: 151

MECHANIC STREET

Fair

Over: ISRAEL RIVER

0.3 MI FROM US RTE 3, Coos, NH

Built 1862 Load: 3.4 t ADT: 743

ROOT HILL ROAD

Fair

Over: MILL BROOK

1.3 MI NH 120, Sullivan, NH

Built 1883 Load: 3.6 t ADT: 91

JOPPA ROAD WEST

Fair

Over: WARNER RIVER

.08 MI FROM NH RTE 103, Merrimack, NH

Built 1853 Load: 4.7 t ADT: 100

DURGIN BRIDGE ROAD

Fair

Over: COLD RIVER

100 FT FR BEARCAMPPOND R, Carroll, NH

Built 1869 Load: 5.4 t ADT: 162

MILL ROAD

Fair

Over: RICE BROOK

0.2 MI. RTE.32, Cheshire, NH

Built 1983 Load: 5.4 t ADT: 68

CARLTON ROAD

Fair

Over: SOUTH BROOK

0.20 MI. RTE 32, Cheshire, NH

Built 1869 Load: 5.4 t ADT: 493

BLAIR ROAD

Fair

Over: PEMIGEWASSET RIVER

0.15 MI E JCT US 3, Grafton, NH

Built 1869 Load: 5.4 t ADT: 1,117

CLARKVILLE ROAD

Fair

Over: S BR PISCATAQUOG RIVER

TOWN RD, Hillsborough, NH

Built 1930 Load: 5.4 t ADT: 17

EAST SIDE ROAD

Fair

Over: SACO RIVER

1.7MI N ALBANY TL, Carroll, NH

Built 1890 Load: 5.8 t ADT: 3,419

NO DATA ENTERED

Fair

Over: NO DATA ENTERED

NO DATA ENTERED, Carroll, NH

Built 1990 Load: 5.8 t ADT: 10

DRAKE ROAD

Fair

Over: WILKINSON BROOK

1.13 MI. OSSIPEE TL, Carroll, NH

Built 1930 Load: 5.9 t ADT: 90

BEARD ROAD

Fair

Over: BEARDS BROOK

2.7 MI FR NH RTE 9, Hillsborough, NH

Built 1900 Load: 6.1 t ADT: 90

BUMP'S INTERVALE

Fair

Over: BEEBE RIVER

80 FT FR PERCH POND RD, Grafton, NH

Built 1877 Load: 6.4 t ADT: 90

NH 16A

Fair

Over: ELLIS RIVER

.05 MI N OF JCT 16, Carroll, NH

Built 1876 Load: 6.5 t ADT: 3,842

COLUMBIA BRIDGE RD

Fair

Over: CONNECTICUT RIVER

VERMONT STATE LINE, Coos, NH

Built 1912 Load: 6.5 t ADT: 257

MT ORNE ROAD

Fair

Over: CONNECTICUT RIVER

AT VERMONT STATE LINE, Coos, NH

Built 1911 Load: 6.5 t ADT: 636

W HOPKINTON ROAD

Fair

Over: CONTOOCOOK RIVER

206 FT FR CLEMENT HILL R, Merrimack, NH

Built 1853 Load: 6.5 t ADT: 545

MUMMERY ROAD EAST

Fair

Over: COLD BROOK

35FT RTE 10, Sullivan, NH

Built 1940 Load: 6.5 t ADT: 90

OLD ROXBURY ROAD

Fair

Over: MINNEWAWA BROOK

1.2 MI. ROXBURY TL, Cheshire, NH

Built 1930 Load: 7.3 t ADT: 90

PORTER ROAD

Fair

Over: WILD AMMONOOSUC RIVER

340 FEET FR NH 112, Grafton, NH

Built 1849 Load: 7.3 t ADT: 618

PARK STREET

Fair

Over: CSX

0.22MI RTE 111A, Rockingham, NH

Built 1900 Load: 8.2 t ADT: 764

HAMMOND HILL ROAD

Fair

Over: WOODMAN BROOK

1.8 MI BRIDGEWATER HILL, Grafton, NH

Built 1930 Load: 8.5 t ADT: 90

NEW ROAD

Fair

Over: CSX

0.12MI. RTE 108, Rockingham, NH

Built 1930 Load: 8.6 t ADT: 530

SQUAG CITY ROAD

Fair

Over: BLOW-ME-DOWN BROOK

80 FT FR PLAINFIELD TL, Sullivan, NH

Built 1877 Load: 8.7 t ADT: 28

FORD MILL ROAD

Fair

Over: SMITH RIVER

.09 MI MASCOMA RD, Merrimack, NH

Built 1988 Load: 9.1 t ADT: 90

WEST BATH ROAD

Fair

Over: AMMONOOSUC R,NHRR(ABD)

0.1 MI NH 10, Grafton, NH

Built 1832 Load: 9.3 t ADT: 90

COOMBS BRIDGE RD

Fair

Over: ASHUELOT RIVER

0.27MI. NH119, Cheshire, NH

Built 1837 Load: 9.8 t ADT: 609

RIVERSIDE DRIVE

Fair

Over: MASCOMA RIVER

1.0MI JCT US. 4, Grafton, NH

Built 1991 Load: 9.8 t ADT: 1,683

OLD BRIDGE STREET

Fair

Over: BEAVER BROOK

0.8 MI FR NH RTE 38, Hillsborough, NH

Built 1920 Load: 9.8 t ADT: 7,140

RIVER STREET

Fair

Over: SQUAM RIVER

1.4 MI FR NH RTE 25, Grafton, NH

Built 1990 Load: 10.0 t ADT: 649

COLBY HILL ROAD

Fair

Over: BLOODS BROOK

175 FT FR BLOODBROOK RD, Sullivan, NH

Built 1880 Load: 10.4 t ADT: 135

CHAMBERS ROAD

Fair

Over: CHERRY MILL BROOK

.6 MI FR CARROL TL, Coos, NH

Built 1920 Load: 10.5 t ADT: 90

OLD ROUTE 3A

Fair

Over: NEEDLE SHOP BROOK

2.41 KM SW OF HILL, Merrimack, NH

Built 1910 Load: 10.7 t ADT: 1

Showing 351-400 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.