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

NH106,MAIN ST

Fair

Over: WINNIPESAUKEE RIVER

1.0 MI BELMONT T.L., Belknap, NH

Built 1970 Load: 33.3 t ADT: 18,428

NH 11

Fair

Over: ELBOW BROOK

5.8 MI FROM FRANKLIN TL, Merrimack, NH

Built 1934 Load: 33.3 t ADT: 2,886

I-93 SB

Fair

Over: NH132

2.5MI S. TILTON TL, Merrimack, NH

Built 1959 Load: 33.3 t ADT: 17,641

I-89 NB

Fair

Over: NH 10

4.9 MI FROM SPRINGFIELD T, Sullivan, NH

Built 1959 Load: 33.3 t ADT: 10,644

I-95

Fair

Over: PISCATAQUA RIVER

I-95 AT MAINE STATE LINE, Rockingham, NH

Built 1971 Load: 33.4 t ADT: 73,085

I-93 SB

Fair

Over: NH175A

1.0 MI ASHLAND T.L., Grafton, NH

Built 1963 Load: 33.5 t ADT: 11,400

I-93 NB

Fair

Over: NH175A

1.0 MI ASHLAND T.L., Grafton, NH

Built 1963 Load: 33.5 t ADT: 10,709

TOWN HOUSE ROAD

Fair

Over: MILL BROOK

2.4 MI. FROM JCT. 12-A, Sullivan, NH

Built 1940 Load: 33.5 t ADT: 632

MILL STREET

Fair

Over: MILL TAIL RACE

.25 MI JCT NH 12, Cheshire, NH

Built 1936 Load: 33.6 t ADT: 90

NORTHSIDE ROAD

Fair

Over: NASH STREAM

1.3 MI. NORTHUMBERLAND TL, Coos, NH

Built 1977 Load: 33.6 t ADT: 342

ELM AVENUE

Fair

Over: NORTH BRANCH RIVER

0.06MI NH9, Hillsborough, NH

Built 1984 Load: 33.6 t ADT: 535

I-89(RAMP F)

Fair

Over: TURKEY RIVER

BOW INTERCHANGE, Merrimack, NH

Built 1959 Load: 33.6 t ADT: 4,580

NH104

Fair

Over: BOG POND BROOK

2.4 MI SW HILL TL, Merrimack, NH

Built 1930 Load: 33.6 t ADT: 3,469

US202,NH 9

Fair

Over: ELM BROOK

2.4 MI E. HENNIKER T.L., Merrimack, NH

Built 1961 Load: 33.6 t ADT: 16,732

NH 10

Fair

Over: EASTMAN BROOK

1.4 MI FROM ORFORD T.L., Grafton, NH

Built 1952 Load: 33.7 t ADT: 1,223

BROOK ROAD

Fair

Over: BROCK BROOK

0.3 MI FR SHIN VALLEY RD, Grafton, NH

Built 1930 Load: 33.8 t ADT: 90

WEST SHORE ROAD

Fair

Over: FOWLER RIVER

0.7 MI FROM ALEXANDRIA TL, Grafton, NH

Built 1931 Load: 33.8 t ADT: 1,710

WEST SHORE ROAD

Fair

Over: NEWFOUND RIVER

2.7 MI FROM DANBURY TL, Grafton, NH

Built 1944 Load: 33.8 t ADT: 3,898

FDR 15

Fair

Over: W.BR.AMMONOOSUC RIVER

MAP 02, Coos, NH

Built 2005 Load: 34.0 t ADT: 99

OLD NH 11

Fair

Over: MERRYMEETING RIVER

0.2 MI SE ALTON TL, Strafford, NH

Built 1926 Load: 34.1 t ADT: 785

WESTGATE ROAD

Fair

Over: BLOW-ME-DOWN BROOK

0.5 MI. RTE.12A, Sullivan, NH

Built 1981 Load: 34.1 t ADT: 180

PRESCOTT ROAD

Fair

Over: SALMON BROOK

250FT. RTE. 127, Belknap, NH

Built 1969 Load: 34.3 t ADT: 1,268

FDR 400

Fair

Over: BEEBE RIVER

MAP 45, Carroll, NH

Built 1982 Load: 34.3 t ADT: 50

NH118

Fair

Over: BLODGETT BROOK

3.3 MI FROM WOODSTOCK TL, Grafton, NH

Built 1960 Load: 34.3 t ADT: 1,127

SAUNDERS HILL ROAD

Fair

Over: BAKER RIVER

0.06 MI. W OF NH 25, Grafton, NH

Built 1928 Load: 34.3 t ADT: 21

RIVER ROAD

Fair

Over: LOVEJOY BROOK

1.6 MI FROM BARTLETT TL, Carroll, NH

Built 1961 Load: 34.5 t ADT: 4,565

SANDWICH NOTCH RD

Fair

Over: BEARCAMP RIVER

5.4 MI FR THORNTON TL, Carroll, NH

Built 1983 Load: 34.5 t ADT: 90

SANDWICH NOTCH RD

Fair

Over: BEARCAMP RIVER

5.1 MI FR THORNTON TL, Carroll, NH

Built 1983 Load: 34.5 t ADT: 90

NH 26

Fair

Over: CLEAR STREAM

0.2 MI NW MILLSFIELD TL, Coos, NH

Built 1951 Load: 34.5 t ADT: 971

STREETER POND ROAD

Fair

Over: AMMONOOSUC RIVER

30 FT FROM RTE 302, Grafton, NH

Built 1980 Load: 34.5 t ADT: 789

NH 31

Fair

Over: STONY BROOK

1.5 MI FM LYNDEBOROUGH TL, Hillsborough, NH

Built 1928 Load: 34.5 t ADT: 3,806

CHASE ROAD

Fair

Over: POWWOW RIVER

.2 MI. SW OF NH 107-A, Rockingham, NH

Built 1967 Load: 34.5 t ADT: 688

RAMSDELL ROAD

Fair

Over: CONTOOCOOK RIVER

.09 MI FR NH RTE 114, Merrimack, NH

Built 1937 Load: 34.6 t ADT: 523

NH101

Fair

Over: DRAKESIDE ROAD

0.6 MI FROM JCT 101C, Rockingham, NH

Built 1963 Load: 34.6 t ADT: 11,203

NH 12A

Fair

Over: MASCOMA RIVER

2.7 MI. N. PLAINFIELD TL, Grafton, NH

Built 1977 Load: 34.7 t ADT: 12,592

WENTWORTH ROAD

Fair

Over: GREAT BROOK

1.9 MI FR WESTMORELAND T, Cheshire, NH

Built 1950 Load: 35.1 t ADT: 319

NH 77,NH114

Fair

Over: PISCATAQUOG RIVER

1.9 MI S OF HENNIKER TL, Hillsborough, NH

Built 1939 Load: 35.1 t ADT: 7,655

NH127

Fair

Over: SPILLWAY CHANNEL

2.77 MI JCT US 202, Merrimack, NH

Built 1961 Load: 35.1 t ADT: 3,357

EAST MILAN ROAD

Fair

Over: HORNE BROOK

0.98 MI MILAN, Coos, NH

Built 1932 Load: 35.3 t ADT: 1,101

I-95

Fair

Over: PREBLE WAY,CSX

Approach to High Level Br, Rockingham, NH

Built 1971 Load: 35.3 t ADT: 73,085

PLEASANT VALLEY RD

Fair

Over: OTTER BROOK

.7 MI FR LOST NATION #51, Coos, NH

Built 1980 Load: 35.4 t ADT: 90

SLAYTON HILL ROAD

Fair

Over: MASCOMA RIVER

.09 MI FROM US RTE NO 4, Grafton, NH

Built 1972 Load: 35.4 t ADT: 1,365

I-93 SB

Fair

Over: NH 18,NH135

AT JCT NH 18 AND NH 135, Grafton, NH

Built 1983 Load: 35.4 t ADT: 3,262

US 3,NH 11,NH132

Fair

Over: GULF BROOK

3.3 MI NE FRANKLIN TL, Belknap, NH

Built 1936 Load: 35.5 t ADT: 22,764

NORTH ROAD

Fair

Over: LEADMINE BROOK

1.1 MI N JCT US 2, Coos, NH

Built 1960 Load: 35.5 t ADT: 90

NH 25,NH113

Fair

Over: COLD BROOK

1.9 MI FROM SANDWICH T.L., Carroll, NH

Built 1938 Load: 35.7 t ADT: 4,973

NH104

Fair

Over: PEMIGEWASSET RIVER

NEW HAMPTON TL, Grafton, NH

Built 1987 Load: 35.7 t ADT: 9,160

US202, NH123

Fair

Over: FERGUSON BROOK

.07 MI. FROM PETERBORO TL, Hillsborough, NH

Built 1959 Load: 35.7 t ADT: 5,007

US202,NH 11

Fair

Over: NHNCRR

.5 MI E OF SPAULDING TPK, Strafford, NH

Built 1957 Load: 35.7 t ADT: 16,131

NH 16

Fair

Over: MOOSE BROOK

3.8 MI BERLIN TL, Coos, NH

Built 1972 Load: 36.1 t ADT: 10,136

Showing 951-1,000 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.