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

NH109

Good

Over: PIKE BROOK

0.3 MI JCT RT 16, Carroll, NH

Built 1974 Load: 32.7 t ADT: 2,028

DEWING ROAD

Good

Over: WEEKS BROOK

0.3MI FR CONWAY TL, Carroll, NH

Built 1969 Load: 32.7 t ADT: 90

OSSIPEE LAKE ROAD

Good

Over: W BR SILVER RIVER

290 FT FR FREEDOM TL, Carroll, NH

Built 1979 Load: 32.7 t ADT: 3,298

VALLEY ROAD

Good

Over: DAN HOLE RIVER

2.8 MI FR OLD NH RTE 16, Carroll, NH

Built 2007 Load: 32.7 t ADT: 421

MOULTONVILLE ROAD

Good

Over: DAN HOLE RIVER

1.54 MI N. JCT. 16, Carroll, NH

Built 1976 Load: 32.7 t ADT: 1,022

NH 16,NH 25

Good

Over: LOVELL RIVER

4.3 MI S TAMWORTH T/L, Carroll, NH

Built 2021 Load: 32.7 t ADT: 11,527

NH 16,NH 25

Good

Over: OLD NH 16,OLD NH 25

NEW NH 16 OVER OLD NH 16, Carroll, NH

Built 1970 Load: 32.7 t ADT: 11,527

SCHOOLHOUSE ROAD

Good

Over: RED HILL RIVER

0.6 MI FROM RED HILL RD, Carroll, NH

Built 2018 Load: 32.7 t ADT: 90

BENNETT ST LOOP

Good

Over: POND BROOK

0.04 MI FR BENNETT ST, Carroll, NH

Built 1994 Load: 32.7 t ADT: 90

BENNETT STREET

Good

Over: POND BROOK

0.9 MI FR INTERVALE RD, Carroll, NH

Built 1979 Load: 32.7 t ADT: 57

BOWMAN DRIVE

Good

Over: BLACK BROOK

450 FT N NH 12, Cheshire, NH

Built 1997 Load: 32.7 t ADT: 480

WEST STREET

Good

Over: ASH SWAMP BROOK

1.9 MI W.FROM KEENE CTR, Cheshire, NH

Built 1990 Load: 32.7 t ADT: 2,270

FAY MARTIN ROAD

Good

Over: TULLY BROOK

0.25 MI. FROM NH119, Cheshire, NH

Built 2013 Load: 32.7 t ADT: 90

NH 12

Good

Over: S BRANCH ASHUELOT RIVER

2.2MI TO TROY CENTER, Cheshire, NH

Built 1983 Load: 32.7 t ADT: 8,843

COUNTY ROAD

Good

Over: GREAT BROOK

5.52 MI SURRY TL, Cheshire, NH

Built 1968 Load: 32.7 t ADT: 355

BUNGY ROAD

Good

Over: MOHAWK RIVER

0.01 MI S JCT NH 26, Coos, NH

Built 1977 Load: 32.7 t ADT: 308

NH115

Good

Over: CHERRY MILL BROOK

2.9 MI SW JCT US RT 2, Coos, NH

Built 1984 Load: 32.7 t ADT: 3,637

US 2

Good

Over: CLEMENT BROOK

5.1 MI FROM GORHAM TL, Coos, NH

Built 1967 Load: 32.7 t ADT: 3,495

US 2

Good

Over: CONNOR BROOK

0.2 MI FROM MAINE SL, Coos, NH

Built 1960 Load: 32.7 t ADT: 3,495

US 4

Good

Over: MASCOMA RIVER

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

Built 1965 Load: 32.7 t ADT: 7,483

BICKFORD WOODS RD

Good

Over: ROCKY BROOK

0.02 MI WENTWORTH TL, Grafton, NH

Built 1973 Load: 32.7 t ADT: 70

NH117

Good

Over: GALE RIVER

0.2 MI E LISBON TL, Grafton, NH

Built 1974 Load: 32.7 t ADT: 1,701

TURNPIKE ROAD

Good

Over: MILL BROOK

1.32 MI. RTE 4, Grafton, NH

Built 1985 Load: 32.7 t ADT: 140

NH 25

Good

Over: OLIVERIAN BROOK

1.5 MI W BENTON TL, Grafton, NH

Built 1975 Load: 32.7 t ADT: 977

US 3,NH 25

Good

Over: SQUAM RIVER

4.0 MI FR CENTER HARBOR T, Grafton, NH

Built 1976 Load: 32.7 t ADT: 3,438

US 4

Good

Over: CONNECTICUT RIVER

0.1 MI FROM VERMONT SL, Grafton, NH

Built 2015 Load: 32.7 t ADT: 11,549

US 4

Good

Over: REC TRAIL,MASCOMA RIVER

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

Built 2015 Load: 32.7 t ADT: 10,800

NH117

Good

Over: SALMON HOLE BROOK

1.0 MI E. JCT. RT. 302, Grafton, NH

Built 1969 Load: 32.7 t ADT: 871

I-93 NB

Good

Over: CONNECTICUT RIVER

@VERMONT STATE LINE, Grafton, NH

Built 1976 Load: 32.7 t ADT: 3,307

I-93 NB

Good

Over: NH 18,NH135

AT JCT NH 18 AND NH 135, Grafton, NH

Built 1983 Load: 32.7 t ADT: 4,127

PETTYBORO ROAD

Good

Over: PETTYBORO BROOK

0.8 MI FROM BATH TL, Grafton, NH

Built 1985 Load: 32.7 t ADT: 208

MERRIMACK ROAD

Good

Over: BEAVER BROOK

0.5 MI NH 101, Hillsborough, NH

Built 1986 Load: 32.7 t ADT: 1,823

STATION ROAD

Good

Over: CHANDLER BROOK

0.3 MI TO JCT US 3, Hillsborough, NH

Built 2007 Load: 32.7 t ADT: 538

SOUTH MAIN STREET

Good

Over: NISSITISSIT RIVER

1.45 MI N MASS SL, Hillsborough, NH

Built 1931 Load: 32.7 t ADT: 3,537

PLEASANT POND ROAD

Good

Over: COLLINS BROOK

1.53 MI. RTE 47, Hillsborough, NH

Built 2010 Load: 32.7 t ADT: 157

POLLARD ROAD

Good

Over: BLACK BROOK

TOWN ROAD, Hillsborough, NH

Built 2008 Load: 32.7 t ADT: 538

US202

Good

Over: N BRANCH RIVER

0.5 MI FROM ANTRIM TL, Hillsborough, NH

Built 1988 Load: 32.7 t ADT: 6,450

CENTURY LANE

Good

Over: COLBY BROOK

1/10 EAST OF ALBUQUERQUE, Hillsborough, NH

Built 2000 Load: 32.7 t ADT: 481

I-293 NB OFF RAMP

Good

Over: MERRIMACK RIVER

AT GRANITE ST BRIDGE, Hillsborough, NH

Built 1983 Load: 32.7 t ADT: 9,505

COUNTY ROAD

Good

Over: SOUHEGAN RIVER

0.23MI AMHERST TL, Hillsborough, NH

Built 1987 Load: 32.7 t ADT: 3,124

US 4,NH 11

Good

Over: RAGGED MOUNTAIN BROOK

1.9 MI FROM WILMOT T.L., Merrimack, NH

Built 1959 Load: 32.7 t ADT: 5,050

US 3,VILLAGE ST

Good

Over: CONTOOCOOK RIVER

0.1 MI S OF BOSCAWEN TL, Merrimack, NH

Built 1984 Load: 32.7 t ADT: 4,705

SARGENT ROAD

Good

Over: WILLIAMS BROOK

190 FT FR ZION HILL RD, Merrimack, NH

Built 1985 Load: 32.7 t ADT: 2,389

FOREST ROAD

Good

Over: WILLIAMS BROOK

0.10 MI FR SARGENT ST, Merrimack, NH

Built 1960 Load: 32.7 t ADT: 573

WINDSOR DRIVE

Good

Over: COHAS BROOK

0.10 MI. WILSON CROSSING, Rockingham, NH

Built 2002 Load: 32.7 t ADT: 187

HAIGH ROAD

Good

Over: EXETER RIVER

.4 MI FROM RT 111-A, Rockingham, NH

Built 1979 Load: 32.7 t ADT: 593

NH101 EB

Good

Over: CHESTER ROAD

2.8MI E OF AUBURN TL, Rockingham, NH

Built 1981 Load: 32.7 t ADT: 20,429

NH101 WB

Good

Over: CHESTER ROAD

2.8MI E OF AUBURN TL, Rockingham, NH

Built 1981 Load: 32.7 t ADT: 20,154

NEW BOSTON ROAD

Good

Over: NORTH BRANCH RIVER

2.7 MI FROM RAYMOND TL, Rockingham, NH

Built 1985 Load: 32.7 t ADT: 558

NOTTINGHAM ROAD

Good

Over: LAMPREY RIVER

0.15 MI. RTE 107, Rockingham, NH

Built 1978 Load: 32.7 t ADT: 978

Showing 1,451-1,500 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.