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

EAST DERRY ROAD

Good

Over: BEAVER BROOK

0.02 MI E JCT BYP 28, Rockingham, NH

Built 1966 Load: 32.7 t ADT: 10,374

MANTER MILL ROAD

Good

Over: COHAS BROOK

0.25ML JUNC. OLD DERRY RD, Rockingham, NH

Built 2000 Load: 32.7 t ADT: 481

HUNTER MILL WAY

Good

Over: COHAS BROOK

.3 M SOUTH OLD DERRY RD, Rockingham, NH

Built 2000 Load: 32.7 t ADT: 481

SOUTH ROAD

Good

Over: BEAVER BROOK

2.6 MI FR HUDSON TL, Rockingham, NH

Built 1970 Load: 32.7 t ADT: 5,166

US 1 BYPASS

Good

Over: HODGSON BROOK

0.3 MI JCT I-95, Rockingham, NH

Built 1940 Load: 32.7 t ADT: 15,307

NH 1A

Good

Over: PARSONS CREEK

4.0 MI FROM N HAMPTON TL, Rockingham, NH

Built 1986 Load: 32.7 t ADT: 1,894

NH111

Good

Over: BEAVER BROOK

AT HUDSON TL, Rockingham, NH

Built 1961 Load: 32.7 t ADT: 13,884

WATSON ROAD

Good

Over: COCHECO RIVER

2.8 MI FROM BARRINGTON T, Strafford, NH

Built 1986 Load: 32.7 t ADT: 2,836

FOURTH STREET

Good

Over: COCHECO RIVER

DOWNTOWN DOVER, Strafford, NH

Built 1978 Load: 32.7 t ADT: 2,140

NH 9,NH108 SB

Good

Over: COCHECO RIVER

0.1 MI JCT NH 4, Strafford, NH

Built 1976 Load: 32.7 t ADT: 5,893

NH 9,NH108 NB

Good

Over: COCHECO RIVER

NB 16 & EB 4, Strafford, NH

Built 1977 Load: 32.7 t ADT: 13,770

APPLEBEE ROAD

Good

Over: BRANCH RIVER

370' FROM INT OF NH 125, Strafford, NH

Built 1966 Load: 32.7 t ADT: 2,640

SPAULDING AVE

Good

Over: CANAL

200 FT FROM 030/097, Strafford, NH

Built 2012 Load: 32.7 t ADT: 990

MAIN STREET

Good

Over: COCHECO RIVER

3.1 MI DOVER TL, Strafford, NH

Built 1986 Load: 32.7 t ADT: 8,160

ECHO VALLEY ROAD

Good

Over: COLD RIVER

161 FT FR NH RTE 123A, Sullivan, NH

Built 2006 Load: 32.7 t ADT: 90

STRAND ROAD

Good

Over: RED WATER BROOK

TOWN RD, Sullivan, NH

Built 1991 Load: 32.7 t ADT: 90

MILL VILLAGE ROAD

Good

Over: MILL BROOK

0.03 MI FR STAGE ROAD, Sullivan, NH

Built 1969 Load: 32.7 t ADT: 124

CROYDON BROOK ROAD

Good

Over: BEAVER BROOK

0.5 MI NEWPORT TL, Sullivan, NH

Built 1974 Load: 32.7 t ADT: 175

KEYES HOLLOW ROAD

Good

Over: COLD RIVER

1.5 MI. TL ACWORTH, Sullivan, NH

Built 2014 Load: 32.7 t ADT: 90

BEAN ROAD

Good

Over: BLOODS BROOK

45 FT FROM NH RTE 120, Sullivan, NH

Built 1969 Load: 32.7 t ADT: 474

MILL STREET

Good

Over: HALFMOON POND OUTLET

0.23 MI NH 31, Sullivan, NH

Built 2012 Load: 32.7 t ADT: 90

NH124

Good

Over: MINNEWAWA BROOK

0.1 MI. FROM JCT. NH 101, Cheshire, NH

Built 1967 Load: 33.0 t ADT: 3,955

I-93 SB

Good

Over: BAY STREET

1.7MI S. TILTON T.L., Merrimack, NH

Built 1960 Load: 33.0 t ADT: 15,211

I-93 NB

Good

Over: BAY STREET

1.7 MI S. TILTON TL, Merrimack, NH

Built 1960 Load: 33.0 t ADT: 15,272

OLD NH 9

Good

Over: GRANITE LAKE OUTLET

200 FT. RTE.9, Cheshire, NH

Built 1932 Load: 33.1 t ADT: 180

OLD CONCORD ROAD

Good

Over: GRANITE LAKE OUTLET

0.1 MI FROM NELSON TL, Cheshire, NH

Built 1932 Load: 33.1 t ADT: 180

LOON MOUNTAIN ROAD

Good

Over: E BR PEMIGEWASSET RIVER

315 FT FROM NH RTE 112, Grafton, NH

Built 2016 Load: 33.3 t ADT: 1,532

NO DATA ENTERED

Good

Over: EASTSIDE TRIB 4

NO DATA ENTERED, Grafton, NH

Built 2015 Load: 33.4 t ADT: 10

NH 9,NH 10

Good

Over: ASHUELOT RIVER

0.2 MI EAST OF JCT NH 12, Cheshire, NH

Built 1978 Load: 33.5 t ADT: 11,910

BANK STREET EXT.

Good

Over: MASCOMA RIVER

.07 MI. FROM JCT. US 4, Grafton, NH

Built 1985 Load: 33.5 t ADT: 2,334

TUFTONBORO ROAD

Good

Over: BEECH RIVER

0.7 MI. TUFTONBORO TL, Carroll, NH

Built 1997 Load: 33.6 t ADT: 90

NORTH MASON ROAD

Good

Over: SPAULDING BROOK

1.7 MI FROM MASON TL, Hillsborough, NH

Built 1988 Load: 33.6 t ADT: 187

NH 12A

Good

Over: MILL BROOK

2.8 MI FROM CLAREMONT TL, Sullivan, NH

Built 1937 Load: 33.6 t ADT: 2,056

NH115A

Good

Over: CHERRY MILL BROOK

3.1 MI CARROLL TL, Coos, NH

Built 1950 Load: 33.7 t ADT: 514

NH 49

Good

Over: DRAKES BROOK

4.5 MI. E. OF THORNTON TL, Grafton, NH

Built 1967 Load: 33.7 t ADT: 2,043

PACKERS FALLS ROAD

Good

Over: LAMPREY RIVER

1.1 MI. NEWMARKET TL, Strafford, NH

Built 1912 Load: 33.7 t ADT: 1,347

NH123

Good

Over: TOWN LINE BROOK

.05 MI. NW SHARON TL, Hillsborough, NH

Built 1939 Load: 33.8 t ADT: 1,775

ALDRICH ROAD

Good

Over: MILL BROOK

0.02MI NH12, Cheshire, NH

Built 1996 Load: 33.9 t ADT: 90

DEERFIELD ROAD

Good

Over: BACK CREEK

2.3 MI. W.OF NH156, Rockingham, NH

Built 2010 Load: 33.9 t ADT: 1,214

US 4,NH 10

Good

Over: MASCOMA RIVER,CSX

4.3 MI LEBANON T.L., Grafton, NH

Built 1945 Load: 34.0 t ADT: 13,417

NH 11B

Good

Over: GUNSTOCK RIVER

0.2 MI E NH RTE 11, Belknap, NH

Built 1970 Load: 34.1 t ADT: 7,598

BASKET STREET

Good

Over: BEARCAMP RIVER

0.05 MI FR SANDWICH NOTCH, Carroll, NH

Built 2020 Load: 34.3 t ADT: 90

JEFFERSON NOTCH RD

Good

Over: S BRANCH BAKER RIVER

1.0 MI S JEFFERSON TL, Coos, NH

Built 1939 Load: 34.3 t ADT: 90

BAILEY ROAD

Good

Over: BOG BROOK

1.5 MI FROM BRISTOL TL, Grafton, NH

Built 1989 Load: 34.3 t ADT: 510

INDUSTRIAL PARK RD

Good

Over: AMMONOOSUC RIVER

0.1 MI FROM US302, Grafton, NH

Built 1995 Load: 34.3 t ADT: 2,201

FRONT STREET

Good

Over: BLACK BROOK

2.2MI S HOOKSETT TL, Hillsborough, NH

Built 1974 Load: 34.3 t ADT: 9,085

CHURCH STREET

Good

Over: WINNIPESAUKEE RIVER

1.4 MI FROM BELMONT TL, Belknap, NH

Built 1981 Load: 34.5 t ADT: 5,413

TUFTONBORO ROAD

Good

Over: BEECH RIVER

3.3 MI FR TUFTONBORO TL, Carroll, NH

Built 1928 Load: 34.5 t ADT: 897

SMITH BRIDGE ROAD

Good

Over: BAKER RIVER

.31 MI N JCT NH 3-A, Grafton, NH

Built 2001 Load: 34.5 t ADT: 2,090

BEAR NOTCH ROAD

Good

Over: DOUGLAS BROOK

.53 MI N. JCT 112, Carroll, NH

Built 1964 Load: 34.7 t ADT: 975

Showing 1,501-1,550 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.