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-93 SB

Good

Over: E BR PEMIGEWASSET RIVER

0.5 MI LINCOLN TL, Grafton, NH

Built 1972 Load: 30.2 t ADT: 7,177

NH155

Good

Over: BELLAMY RIVER

.2MI FROM DOVER TL, Strafford, NH

Built 1982 Load: 30.4 t ADT: 12,126

NH 16,SP TPK

Good

Over: LYMAN BROOK

1.8 MI N OF ROCHESTER TL, Strafford, NH

Built 1980 Load: 30.5 t ADT: 16,271

RUDDSBORO ROAD

Good

Over: MINK BROOK

3.8 MI FR LEBANON TL, Grafton, NH

Built 2004 Load: 30.6 t ADT: 90

NORTH RIVER ROAD

Good

Over: PURGATORY BROOK

.64 MI LYNDEBORO TL., Hillsborough, NH

Built 1978 Load: 30.6 t ADT: 2,641

ELM STREET

Good

Over: WINNIPESAUKEE RIVER

NORTHFIELD TL., Belknap, NH

Built 1977 Load: 30.7 t ADT: 9,224

COUNTY ROAD

Good

Over: MELVIN RIVER

0.5 MI FROM NH RTE 109, Carroll, NH

Built 1936 Load: 30.7 t ADT: 97

MILL POND ROAD

Good

Over: COLLEGE BROOK

.2 MI WEST NH108 JCT, Strafford, NH

Built 1998 Load: 30.7 t ADT: 1,649

I-93 SB

Good

Over: NH 49

0.7 MI THORNTON TL, Grafton, NH

Built 1968 Load: 30.8 t ADT: 7,500

I-89,NH 10 NB

Good

Over: NHRR(ABD)

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

Built 1966 Load: 30.8 t ADT: 15,942

I-93 NB

Good

Over: NH112,NHRR

0.29 MI LINCOLN TL, Grafton, NH

Built 1972 Load: 30.8 t ADT: 7,054

I-89 SB

Good

Over: COLUMBUS AVENUE

2.9 MI SUTTON T.L, Merrimack, NH

Built 1967 Load: 30.8 t ADT: 9,665

PATTERSON ROAD

Good

Over: KIMPTON BROOK

100 YDS N RT 4A, Merrimack, NH

Built 1994 Load: 30.8 t ADT: 90

US302

Good

Over: AMMONOOSUC RIVER

2.7 MI E. INT. US 3, Coos, NH

Built 1974 Load: 31.0 t ADT: 4,613

I-93 NB

Good

Over: NH132

1.7MI S TILTON TL, Merrimack, NH

Built 1959 Load: 31.0 t ADT: 15,272

SCOBY ROAD

Good

Over: HAUNTED LAKE OUTLET

0.7 MI SOUTH JCT NH 136, Hillsborough, NH

Built 2015 Load: 31.2 t ADT: 90

NH 4

Good

Over: SALMON FALLS RIVER

AT MAINE STATE LINE, Strafford, NH

Built 1970 Load: 31.2 t ADT: 10,271

COBB FARM ROAD

Good

Over: RAZOR BROOK

1.9 MI FR HARTS LOCATION, Carroll, NH

Built 1935 Load: 31.4 t ADT: 315

US302

Good

Over: SACO RIVER

5.3 MI FROM CARROLL TL, Carroll, NH

Built 1976 Load: 31.4 t ADT: 2,100

NH 16,SP TPK

Good

Over: MCKEAGHNEY ROAD

0.9 MI N OF ROCHESTER TL, Strafford, NH

Built 1978 Load: 31.4 t ADT: 16,271

LYMAN ROAD

Good

Over: MILL BROOK

.59 MI N.W. JCT. 302, Grafton, NH

Built 1974 Load: 31.5 t ADT: 825

NH101

Good

Over: SOUHEGAN RIVER

0.04 MI MILFORD TL, Hillsborough, NH

Built 1971 Load: 31.5 t ADT: 14,854

NH106

Good

Over: SOUCOOK RIVER

CANTERBURY-LOUDON TL, Merrimack, NH

Built 1952 Load: 31.5 t ADT: 8,087

DEPOT STREET

Good

Over: SUNCOOK RIVER

0.06 MI FR EPSOM TL, Merrimack, NH

Built 1981 Load: 31.5 t ADT: 443

I-95

Good

Over: MARKET STREET

1.5 MI FROM MAINE SL, Rockingham, NH

Built 1970 Load: 31.5 t ADT: 68,986

I-93 SB

Good

Over: NH132

1.7MI S OF TILTON TL, Merrimack, NH

Built 1959 Load: 31.7 t ADT: 15,211

I-89 SB

Good

Over: NH114

0.6 MI FROM SPRINGFIELD T, Sullivan, NH

Built 1967 Load: 31.7 t ADT: 9,549

I-93 SB

Good

Over: HALE ROAD

4.5MI TILTON T.L., Belknap, NH

Built 1963 Load: 31.8 t ADT: 14,007

I-93 NB

Good

Over: HALE ROAD

4.5 MI FROM TILTON TL, Belknap, NH

Built 1963 Load: 31.8 t ADT: 14,051

NH 9,NH 10,NH 12

Good

Over: WEST STREET

1.0 MI TO KEENE CENTER, Cheshire, NH

Built 1967 Load: 31.8 t ADT: 16,495

FARAWAY ROAD

Good

Over: JOHNS RIVER

131 FT FR SMITH FOREST R, Coos, NH

Built 1976 Load: 31.8 t ADT: 90

I-93 NB

Good

Over: CLARKS RR,PEMIGEWASSET R

1.5 MI N WOODSTOCK TL, Grafton, NH

Built 1981 Load: 31.8 t ADT: 5,375

NH106

Good

Over: SOUCOOK RIVER

2.6 MI FROM CONCORD TL, Merrimack, NH

Built 1977 Load: 31.8 t ADT: 12,344

NH101

Good

Over: NHRR(ABD)

.1 MI. FROM JCT RT 1, Rockingham, NH

Built 1963 Load: 31.8 t ADT: 8,448

NH 16,SP TPK

Good

Over: BETTS ROAD

1.1 MI S OF MILTON TL, Strafford, NH

Built 1978 Load: 31.8 t ADT: 16,271

I-93 SB

Good

Over: CLARKS RR,PEMIGEWASSET R

1.56 MI N WOODSTOCK TL, Grafton, NH

Built 1973 Load: 32.0 t ADT: 5,700

NH 16,SP TPK

Good

Over: SILVER STREET

3.5 MI N OF ROCHESTER TL, Strafford, NH

Built 1980 Load: 32.0 t ADT: 14,303

NORTH ROAD

Good

Over: OTTER BROOK

2.9 MI NW JEFFERSON TL, Coos, NH

Built 1958 Load: 32.2 t ADT: 1,214

I-93 SB

Good

Over: CONNECTICUT RIVER

VERMONT STATE LINE, Grafton, NH

Built 1981 Load: 32.2 t ADT: 3,262

NH106

Good

Over: SOUCOOK RIVER

1.3 MI FROM CONCORD TL, Merrimack, NH

Built 1977 Load: 32.2 t ADT: 15,134

I-93 SB

Good

Over: NH127

2.2MI FROM TILTON T.L., Belknap, NH

Built 1962 Load: 32.3 t ADT: 14,007

I-93 NB

Good

Over: NH127

2.2MI FROM TILTON-SANBORN, Belknap, NH

Built 1962 Load: 32.3 t ADT: 14,857

CANAAN STREET

Good

Over: MASCOMA RIVER

0.3 MI. SE JCT. RTE. 50, Grafton, NH

Built 1936 Load: 32.3 t ADT: 691

I-93 SB

Good

Over: PEMIGEWASSET RIVER

HOLDERNESS-PLYMOUTH TL, Grafton, NH

Built 1964 Load: 32.5 t ADT: 11,400

NH 16,SP TPK

Good

Over: NH 75

2.1 MI N OF ROCHESTER TL, Strafford, NH

Built 1980 Load: 32.5 t ADT: 14,303

WHITE OAKS ROAD

Good

Over: SUNCOOK RIVER

0.3 MI FR GILMANTON TL, Belknap, NH

Built 1986 Load: 32.7 t ADT: 1,214

SOUTH ROAD

Good

Over: WHICHIER BROOK

6.7 MI FROM LACONIA TL, Belknap, NH

Built 1984 Load: 32.7 t ADT: 859

SILVER LAKE ROAD

Good

Over: HYDRO CANAL

.25 MI E OF US RTE. 3, Belknap, NH

Built 1984 Load: 32.7 t ADT: 1,681

FERNCROFT ROAD

Good

Over: WONALANCET BROOK

.1 M N OF 113A, Carroll, NH

Built 1973 Load: 32.7 t ADT: 90

DRAKE HILL ROAD

Good

Over: CHOCORUA RIVER

0.1 MI E NH16, Carroll, NH

Built 1986 Load: 32.7 t ADT: 110

Showing 1,401-1,450 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.