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

JONES ROAD

Good

Over: HOYT BROOK

0.4 MI NH 114, Merrimack, NH

Built 2008 Load: 53.1 t ADT: 468

LOWER MAIN STREET

Good

Over: SUGAR RIVER

0.3 MI FR NH RTE 11, Sullivan, NH

Built 1900 Load: 53.1 t ADT: 735

US302,NH113

Good

Over: CONWAY LAKE OUTLET

2.6 MI. FRYBERG ME S/L, Carroll, NH

Built 2021 Load: 53.3 t ADT: 11,517

MILL HILL ROAD

Good

Over: DAN HOLE RIVER

146 FT FR DANA MERROW RD, Carroll, NH

Built 1940 Load: 53.3 t ADT: 22

NH 16,SP TPK RAMP

Good

Over: COCHECO R. BACKWATER

SB OFFRAMP/ COCHECO BKWTR, Strafford, NH

Built 2012 Load: 53.3 t ADT: 2,820

NH109

Good

Over: SALMON FALLS RIVER

NH-ME STATE LINE, Carroll, NH

Built 1962 Load: 53.4 t ADT: 777

CHRISTIE ROAD

Good

Over: STRATFORD BOG BROOK

320 FT FROM BOG ROAD., Coos, NH

Built 2003 Load: 53.5 t ADT: 90

I-93 NB

Good

Over: NHRR

0.3 MI THORNTON TL, Grafton, NH

Built 1970 Load: 53.5 t ADT: 7,387

I-93 SB

Good

Over: NHRR

0.4 MI THORNTON TL, Grafton, NH

Built 1970 Load: 53.5 t ADT: 7,500

RESERVOIR DRIVE

Good

Over: PISCATAQUOG RIVER

0.10 MI FR PAGE HILL RD, Hillsborough, NH

Built 1994 Load: 53.5 t ADT: 1,340

SHAKER ROAD

Good

Over: BROOK

Adjacent to jct NH140, Merrimack, NH

Built 2019 Load: 53.6 t ADT: 1,214

NH104,PLEASANT ST

Good

Over: NEWFOUND RIVER

0.9 MI E ALEXANDRIA TL, Grafton, NH

Built 1996 Load: 53.7 t ADT: 5,700

DREW ROAD

Good

Over: DREW BROOK

0.8 M HAMPSTEAD T/L, Rockingham, NH

Built 2011 Load: 53.8 t ADT: 446

HAVERHILL ROAD

Good

Over: SPICKET RIVER

COWBELL CORNER, Rockingham, NH

Built 2008 Load: 54.0 t ADT: 2,356

RESERVOIR ROAD

Good

Over: CAMP BROOK

0.9 MI FR NH RTE 10/120, Grafton, NH

Built 2021 Load: 54.2 t ADT: 480

HANOVER CENTER RD

Good

Over: MONAHAN BROOK

4.2 MI FR LYME TL, Grafton, NH

Built 1929 Load: 54.2 t ADT: 1,214

NH 25,NH118

Good

Over: PATCH BROOK

0.8 MI FROM WENTWORTH TL, Grafton, NH

Built 1962 Load: 54.2 t ADT: 3,654

FLING ROAD

Good

Over: CLAY BROOK

.35 MI. EAST OF ROUTE 12, Sullivan, NH

Built 2011 Load: 54.2 t ADT: 90

NH103

Good

Over: SUGAR RIVER

0.2 M W NEWPORT T.L., Sullivan, NH

Built 1957 Load: 54.3 t ADT: 2,926

OLD SHAKER ROAD

Good

Over: SHAKER BROOK

1.7 MI FROM RTE 106, Merrimack, NH

Built 1920 Load: 54.4 t ADT: 395

NH108,COURT ST

Good

Over: LITTLE RIVER

.6 MI FROM JCT 101C, Rockingham, NH

Built 2018 Load: 54.4 t ADT: 5,172

RIVER STREET

Good

Over: SACO RIVER OVERFLOW

0.50 M. FROM US302, Carroll, NH

Built 2015 Load: 54.5 t ADT: 444

US 4

Good

Over: TEWKSBURY POND OUTLET

1/4MI S TEWKSBURY POND, Grafton, NH

Built 2000 Load: 54.5 t ADT: 1,822

EVANS ROAD

Good

Over: S BRANCH BAKER RIVER

60 FT FR NO DORCHESTER R, Grafton, NH

Built 1937 Load: 54.5 t ADT: 90

US 4, NH 10

Good

Over: MASCOMA RIVER

6.4 MI FROM HANOVER TL, Grafton, NH

Built 1954 Load: 54.6 t ADT: 8,230

HUMMINGBIRD LANE

Good

Over: SAND BROOK

0.4 MI FR. HENNIKER T/L, Hillsborough, NH

Built 2013 Load: 54.8 t ADT: 300

I-93 NB

Good

Over: BEAVER BROOK

AT LONDONDERRY TL, Rockingham, NH

Built 2019 Load: 54.8 t ADT: 40,201

NH145

Good

Over: BISHOP BROOK

2.8 MI N OF COLBROOK TL, Coos, NH

Built 2017 Load: 54.9 t ADT: 708

PARKER ROAD

Good

Over: PISCATAQUOG RIVER

NEW BOSTON TL, Hillsborough, NH

Built 2000 Load: 54.9 t ADT: 1,335

I-293,FEE TPK

Good

Over: N BR PISCATAQUOG RIVER

.3 MI SECOND ST, Hillsborough, NH

Built 2016 Load: 55.0 t ADT: 67,263

I-89,NH 10 SB

Good

Over: HARDY HILL ROAD

2.5 MI FROM ENFIELD T.L., Grafton, NH

Built 1966 Load: 55.1 t ADT: 16,350

I-89,NH 10 NB

Good

Over: HARDY HILL ROAD

2.5 MI FROM ENFIELD T.L., Grafton, NH

Built 1966 Load: 55.1 t ADT: 15,942

NH 25C

Good

Over: EASTMAN BROOK

2.51 MI. NW OF WARREN TL, Grafton, NH

Built 1936 Load: 55.1 t ADT: 442

BEAN ROAD

Good

Over: BABOOSIC BROOK

365 FT FR PROFILE DRIVE, Hillsborough, NH

Built 2016 Load: 55.1 t ADT: 1,132

STAGE ROAD

Good

Over: NIGHTHAWK HOLLOW BROOK

TOWN RD., Belknap, NH

Built 2021 Load: 55.2 t ADT: 1,214

TASKER HILL ROAD

Good

Over: PEQUAWKET POND

IN CONWAY VILLAGE, Carroll, NH

Built 2010 Load: 55.2 t ADT: 90

BEDFORD ROAD

Good

Over: BABOOSIC BROOK

1.7 MI FR BEDFORD TL, Hillsborough, NH

Built 2020 Load: 55.2 t ADT: 7,152

NH135

Good

Over: JOHNS RIVER

4.8 MI FROM LITTLETON TL, Coos, NH

Built 1997 Load: 55.3 t ADT: 937

SULLIVAN DRIVE

Good

Over: MILL BROOK

0.19 MI FR MILLBROOK RD, Grafton, NH

Built 1986 Load: 55.5 t ADT: 90

LYNDEBOROUGH ROAD

Good

Over: S BR PISCATAQUOG RIVER

0.4 MI FR BUTTERFIELD RD, Hillsborough, NH

Built 2010 Load: 55.5 t ADT: 90

OLD NO BRANCH ROAD

Good

Over: NORTH BRANCH RIVER

0.1MI. NH9, Hillsborough, NH

Built 2011 Load: 55.7 t ADT: 39

NH 9

Good

Over: OTTER BROOK

0.5 MI SW TO ROXBURY TL, Cheshire, NH

Built 2020 Load: 55.9 t ADT: 7,791

NH115A

Good

Over: CHERRY MILL BROOK

3.6 MI FROM JCT RTE 2, Coos, NH

Built 1936 Load: 55.9 t ADT: 514

PADDY ACRE ROAD

Good

Over: BROOK

0.14 MI FR MOULTONVILLE, Carroll, NH

Built 2017 Load: 56.0 t ADT: 90

NH114

Good

Over: STOCKER POND OUTLET

.67 MI. SW SPRINGFIELD TL, Sullivan, NH

Built 1934 Load: 56.0 t ADT: 701

CEDAR STREAM ROAD

Good

Over: DEAD WATER STREAM

TOWN RD, Coos, NH

Built 2004 Load: 56.3 t ADT: 90

STAGE ROAD

Good

Over: BROOK

0.25MI LOUDON TL, Belknap, NH

Built 2021 Load: 56.7 t ADT: 824

NH112,KANCAMAGUS

Good

Over: HOBBS BROOK

3.3 MI FROM CONWAY TL, Carroll, NH

Built 1990 Load: 56.7 t ADT: 1,855

CROSS ROAD

Good

Over: PEMIGEWASSET RIVER

0.18 MI. E. OF JCT US 3, Grafton, NH

Built 1973 Load: 56.7 t ADT: 764

THRASHER ROAD

Good

Over: RED WATER BROOK

1.4MI NH12, Sullivan, NH

Built 1900 Load: 56.7 t ADT: 567

Showing 2,151-2,200 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.