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

I-95 NB

Good

Over: TAYLOR RIVER

3.75 MI N of MA S/L, Rockingham, NH

Built 2018 Load: 50.8 t ADT: 41,997

I-93 NB

Good

Over: BOG BROOK

1.1 MI FROM PLYMOUTH TL, Grafton, NH

Built 1963 Load: 51.0 t ADT: 10,268

POND ROAD

Good

Over: BEAVER BROOK

0.3MI NH102, Rockingham, NH

Built 1935 Load: 51.1 t ADT: 481

US202,NH 11,SP TPK

Good

Over: CHESTNUT HILL ROAD

2.9 MI S OF MILTON TL, Strafford, NH

Built 1978 Load: 51.1 t ADT: 15,051

US 3

Good

Over: LITTLE RIVER

0.5 MI FROM BETHLEHEM TL, Coos, NH

Built 1990 Load: 51.3 t ADT: 3,142

NH145

Good

Over: CONNECTICUT RIVER

PITTSBURG TL, Coos, NH

Built 2006 Load: 51.3 t ADT: 686

STINSON LAKE ROAD

Good

Over: BROWN BROOK

0.88 MI N RUMNEY TL, Grafton, NH

Built 1900 Load: 51.3 t ADT: 253

CHRISTINE LAKE RD

Good

Over: CHRISTINE LAKE OUTLET

0.8 MI N NH 110 VIA INV60, Coos, NH

Built 1940 Load: 51.4 t ADT: 90

THORNTON GORE RD

Good

Over: EASTMAN BROOK

0.3 MI FROM WOODSTOCK TL, Grafton, NH

Built 1988 Load: 51.4 t ADT: 219

SECOND NH TPK

Good

Over: BROOK

1.0 MI. ANTRIM TL, Hillsborough, NH

Built 1900 Load: 51.4 t ADT: 710

VT114,MAIN STREET

Good

Over: CONNECTICUT RIVER

AT VERMONT STATE LINE, Coos, NH

Built 1990 Load: 51.6 t ADT: 2,111

MORRILL HILL ROAD

Good

Over: ELBOW BROOK

0.3 MI FR SLEEPER HILL R, Merrimack, NH

Built 2018 Load: 51.6 t ADT: 121

NH 10

Good

Over: CROYDON BRANCH SUGAR R

4.4 MI FROM NEWPORT TL, Sullivan, NH

Built 1935 Load: 51.6 t ADT: 3,480

HALFMOON POND RD

Good

Over: HALFMOON POND OUTLET

0.55 MI NH 31, Sullivan, NH

Built 2009 Load: 51.6 t ADT: 90

I-93 NB

Good

Over: BLAIR ROAD

2.1 MI FROM PLYMOUTH T.L., Grafton, NH

Built 1963 Load: 51.7 t ADT: 10,268

GREGG LAKE ROAD

Good

Over: GREGG LAKE

TOWN RD, Hillsborough, NH

Built 1997 Load: 51.7 t ADT: 198

BRADLEY LAKE ROAD

Good

Over: BRADLEY BROOK

2.3 MI FR NH RTE 4, Merrimack, NH

Built 1960 Load: 51.7 t ADT: 90

NH 16

Good

Over: NHNCRR

.88MI S. OSSIPEE T.L., Carroll, NH

Built 1956 Load: 51.8 t ADT: 7,764

I-93 SB

Good

Over: NH142

1.4 MI S SUGAR HILL TL, Grafton, NH

Built 1959 Load: 51.8 t ADT: 2,362

I-93 NB

Good

Over: NH142

1.4 MI S SUGARHILL TL, Grafton, NH

Built 1973 Load: 51.8 t ADT: 2,282

NH 27

Good

Over: BLOODY BROOK

0.6 MI W JCT NH 27/NH101, Rockingham, NH

Built 1998 Load: 51.8 t ADT: 11,517

I-293,FEE TPK

Good

Over: S BR PISCATAQUOG RIVER

.8 MI BEDFORD TL, Hillsborough, NH

Built 2016 Load: 51.9 t ADT: 62,482

NH152

Good

Over: CSX

.1 MI FROM JCT RT 108, Rockingham, NH

Built 1927 Load: 51.9 t ADT: 8,892

PET SHOP DRIVE

Good

Over: LITTLE RIVER

.75 MI W NH125, Rockingham, NH

Built 2005 Load: 51.9 t

QUAKER CITY ROAD

Good

Over: LITTLE SUGAR RIVER

0.4 MI. ACWORTH TL, Sullivan, NH

Built 1930 Load: 51.9 t ADT: 90

MILTON ROAD

Good

Over: DAMES BROOK

0.60MI NE JCT NH153, Strafford, NH

Built 2002 Load: 52.0 t ADT: 90

TOWN POUND ROAD

Good

Over: BOG BROOK

.7 MI FROM BOG RD, Grafton, NH

Built 2003 Load: 52.1 t ADT: 580

NORTH GROTON ROAD

Good

Over: COCKERMOUTH RIVER

0.5 MI FROM HEBRON TL, Grafton, NH

Built 1930 Load: 52.1 t ADT: 170

NH 75,CENTRAL ST

Good

Over: COCHECO RIVER

.14 MI. W. JCT. NH 11, Strafford, NH

Built 1985 Load: 52.1 t ADT: 2,919

SP TPK SB ON RAMP

Good

Over: COCHECO RIVER

.1 MILE SOUTH OF RT. 125, Strafford, NH

Built 2009 Load: 52.1 t ADT: 2,229

SCENIC DRIVE

Good

Over: POOR FARM BROOK

1.3 MI FR BELKNAP POINT, Belknap, NH

Built 1966 Load: 52.2 t ADT: 590

WELCH ROAD

Good

Over: LITTLE RIVER

0.6 MI FR STRAFFORD TL, Belknap, NH

Built 2010 Load: 52.3 t ADT: 90

NH101 WB

Good

Over: PISCASSIC RIVER

1.1MI E NH101/NH125 JCT, Rockingham, NH

Built 1997 Load: 52.3 t ADT: 19,677

WIECZOREK DR

Good

Over: LITTLE COHAS BROOK

0.5 FROM MHT, Rockingham, NH

Built 2011 Load: 52.3 t ADT: 5,988

OLD LAKE SHORE RD

Good

Over: GUNSTOCK RIVER

240 FT FR INTERVALE RD, Belknap, NH

Built 1927 Load: 52.4 t ADT: 662

NH 25

Good

Over: PINE RIVER

0.6 MI FROM OLD N.H. 16, Carroll, NH

Built 1963 Load: 52.4 t ADT: 6,071

BOG ROAD

Good

Over: STRATFORD BOG BROOK

2.5 MI. US3, Coos, NH

Built 1998 Load: 52.4 t ADT: 228

I-93 SB

Good

Over: NHRR

4.7 MI PLYMOUTH TL, Grafton, NH

Built 1968 Load: 52.4 t ADT: 9,903

I-393,US 4,US202W

Good

Over: SOUCOOK RIVER

CONCORD PEMBROOK TL, Merrimack, NH

Built 1988 Load: 52.4 t ADT: 7,980

FLAT ROCK BR RD

Good

Over: SALMON FALLS RIVER

0.08MI. MAINE SL, Strafford, NH

Built 1983 Load: 52.4 t ADT: 1,617

OLD RICHMOND ROAD

Good

Over: S BRANCH ASHUELOT RIVER

2.41MI. RTE32, Cheshire, NH

Built 1999 Load: 52.6 t ADT: 956

GARLAND ROAD

Good

Over: OTTER BROOK

0.03 MI FR GRANGE RD, Coos, NH

Built 1992 Load: 52.6 t ADT: 417

NH101 EB

Good

Over: LITTLE RIVER

.25 MI E EXETER TL, Rockingham, NH

Built 1997 Load: 52.6 t ADT: 21,071

NH101 WB

Good

Over: LITTLE RIVER

.25 MI W OF EXETER TL, Rockingham, NH

Built 1997 Load: 52.6 t ADT: 20,611

NH 1A

Good

Over: SAGAMORE CREEK

0.4 mi from RYE TL, Rockingham, NH

Built 2015 Load: 52.6 t ADT: 6,553

NH 1A

Good

Over: SEAVEY CREEK

1.6 MI FROM JCT RTE 1B, Rockingham, NH

Built 2009 Load: 52.6 t ADT: 1,052

NH 25

Good

Over: OLIVERIAN BROOK

1.4 MI FROM BENTON TL, Grafton, NH

Built 1999 Load: 52.7 t ADT: 1,051

GRANITE STREET

Good

Over: MERRIMACK RIVER

0.5 MI FROM WINTER STREET, Hillsborough, NH

Built 1981 Load: 52.7 t ADT: 25,527

US 4

Good

Over: MERRIMACK RIVER

CANTERBURY T.L., Merrimack, NH

Built 2005 Load: 52.7 t ADT: 14,848

OLD KEENE ROAD

Good

Over: GREAT BROOK

0.46 NNE OF NH RTE 12 JCT, Cheshire, NH

Built 2008 Load: 53.0 t ADT: 238

Showing 2,101-2,150 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.