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

Data updated May 2026

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

New Hampshire50.1%41.6%8.3%GoodFairPoor (structurally 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.

NY

New York

6.90% top marginal rate
Structure
Progressive
Burden @ $100K
$19,132

KY

Kentucky

7.06% top marginal rate
Structure
Progressive
Burden @ $100K
$14,554
Selected

NH

New Hampshire

7.08% top marginal rate
Structure
Progressive
Burden @ $100K
$2,542

OK

Oklahoma

7.50% top marginal rate
Structure
Progressive
Burden @ $100K
$22,733

NM

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

GARLAND ROAD

Unknown

Over: NH 28

1.0 MI FROM PITTSFIELD TL, Belknap, NH

Built 1969 ADT: 11,000

NH 28

Unknown

Over: BEAUTY HILL ROAD

1.3 MI FR PITTSFIELD T.L., Belknap, NH

Built 1969

US 3,NH 11

Unknown

Over: US 3,NH 11

3.4 MI FROM LACONIA T.L., Belknap, NH

Built 1965 ADT: 14,000

MORRILL STREET

Unknown

Over: US 3,NH 11 BYPASS

2.5 MI FROM LACONIA TL, Belknap, NH

Built 1965 ADT: 9,275

NH106

Unknown

Over: US 3,NH 11

.4 MI BELMONT TL, Belknap, NH

Built 1964 ADT: 7,700

I-93 SB

Unknown

Over: NH132

SANBORNTON T.L., Belknap, NH

Built 1963 ADT: 580

PINNACLE HILL ROAD

Unknown

Over: I-93

1.1 MI MEREDITH TL, Belknap, NH

Built 1963 ADT: 25,000

I-93 NB

Unknown

Over: NH104,NH132

1.1 MI MEREDITH TL, Belknap, NH

Built 1963 ADT: 8,900

I-93 NB

Unknown

Over: NH132

5.2 MI MEREDITH TL, Belknap, NH

Built 1964 ADT: 1,400

US 3,NH 11,NH132

Unknown

Over: I-93

.1 MI WINNIPESAUKEE RIVER, Belknap, NH

Built 2000 ADT: 27,326

NH 16

Unknown

Over: NH 25

6.0 MI TAMWORTH T.L., Carroll, NH

Built 1969 ADT: 4,600

NH101

Unknown

Over: GOLDMINE ROAD

0.6 MI PETERBOROUGH TL, Cheshire, NH

Built 1967 ADT: 380

NH 9,NH 10

Unknown

Over: NH 12

NORTH JCT OF NH 9, 10 &12, Cheshire, NH

Built 1978 ADT: 15,000

COURT ST

Unknown

Over: NH 9,NH 10

1.1 MI FROM KEENE CENTER, Cheshire, NH

Built 1977 ADT: 12,000

NH 9

Unknown

Over: OLD NH 9,GRANITE LK OUT

1.1 MI E SULLIVAN TL, Cheshire, NH

Built 1994 ADT: 210

MURDOUGH HILL ROAD

Unknown

Over: NH 9

1.6 MI EAST SULLIVAN TL, Cheshire, NH

Built 1994 ADT: 6,300

NORTH ASHLAND ROAD

Unknown

Over: I-93

.3MI FROM HOLDERNESS, Grafton, NH

Built 1963 ADT: 17,000

I-93 SB

Unknown

Over: US 3,NH 25

0.8 MI NEW HAMPTON T/L, Grafton, NH

Built 1963 ADT: 2,700

I-93 NB

Unknown

Over: US 3, NH 25

0.8 MI FROM NEW HAMPTON T, Grafton, NH

Built 1963 ADT: 2,200

US302,NH 18,NH116

Unknown

Over: I-93

2.1 MI SUGARHILL TL, Grafton, NH

Built 1959 ADT: 6,800

WEST FARM ROAD

Unknown

Over: I-93

1.7 MI SUGARHILL TL, Grafton, NH

Built 1959 ADT: 6,200

EASTMAN HILL ROAD

Unknown

Over: I-89,NH 10

0.2 MI LEBANON T.L., Grafton, NH

Built 1961 ADT: 21,200

I-89,NH 10 SB

Unknown

Over: SMITH POND ROAD

2.2 MI FROM GRANTHAM T.L., Grafton, NH

Built 1959 ADT: 40

I-89,NH 10 NB

Unknown

Over: SMITH POND ROAD

2.2 MI GRANTHAM T.L., Grafton, NH

Built 1959 ADT: 40

I-93 SB ON RAMP

Unknown

Over: I-93

4.9 MI LINCOLN TL, Grafton, NH

Built 1959 ADT: 5,000

NH 18

Unknown

Over: I-93 PARKWAY

3 MI.N LINCOLN TL, Grafton, NH

Built 1986 ADT: 8,400

I-89 SB OFF RAMP

Unknown

Over: PLAZA CONNECTOR ROAD

SB OFF RAMP AT EXIT 20, Grafton, NH

Built 2012 ADT: 100

I-89 SB

Unknown

Over: PLAZA CONNECTOR ROAD

0.4 MI EAST OF VT/NH LINE, Grafton, NH

Built 2012 ADT: 150

I-89 NB

Unknown

Over: PLAZA CONNECTOR ROAD

0.4 MI EAST OF VT/NH LINE, Grafton, NH

Built 2012 ADT: 100

I-89 SB

Unknown

Over: NH 12A

0.5 MI FROM VT S.L., Grafton, NH

Built 2012 ADT: 14,000

I-89 NB

Unknown

Over: NH 12A

0.5 MI FROM VT. S.L., Grafton, NH

Built 2012 ADT: 14,000

POVERTY LANE

Unknown

Over: I-89

2.3 MI FROM VT S.L., Grafton, NH

Built 1966 ADT: 35,900

I-89 NB

Unknown

Over: US 4,NH 10

2.6 MI FROM VT SL, Grafton, NH

Built 1966 ADT: 14,000

I-89 SB

Unknown

Over: US 4,NH 10

2.6 MI FROM VT S.L., Grafton, NH

Built 1966 ADT: 13,000

MASCOMA STREET

Unknown

Over: I-89,NH 10

5.5 MI ENFIELD TL, Grafton, NH

Built 1966 ADT: 29,400

NH120

Unknown

Over: I-89

.7MI FROM JCT RTE 4, Grafton, NH

Built 1966 ADT: 35,100

I-89 NB

Unknown

Over: HEATER ROAD

0.6 MI FROM HARDY HILL RD, Grafton, NH

Built 1966 ADT: 2,300

I-89 SB

Unknown

Over: MASCOMA R,RIVERSIDE DR

2.0MI FROM ENFIELD T.L., Grafton, NH

Built 1966 ADT: 1,700

I-89,NH 10 NB

Unknown

Over: US 4

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

Built 1966 ADT: 3,900

I-89,NH 10 SB

Unknown

Over: US 4

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

Built 1966 ADT: 4,800

I-89,NH 10 NB

Unknown

Over: RIVERSIDE DR,MASCOMA RIV

2.0 MIFROM ENFIELD T.L., Grafton, NH

Built 1966 ADT: 1,500

I-93 SB

Unknown

Over: US 3

1.74 MI N WOODSTOCK TL, Grafton, NH

Built 1973 ADT: 2,900

I-93 NB

Unknown

Over: US 3

1.7 MI NORTH WOODSTOCK T, Grafton, NH

Built 1985 ADT: 2,900

HILLTOP ROAD

Unknown

Over: I-93

0.24MI. FROM RD. #14, Grafton, NH

Built 1985 ADT: 6,800

NH135

Unknown

Over: I-93

4 MI N OF BETHLEHEM TL, Grafton, NH

Built 1981 ADT: 6,900

US302,NH 10

Unknown

Over: I-93

2.4 MI BETHLEHEM TL, Grafton, NH

Built 1960 ADT: 6,900

US 3

Unknown

Over: US 3A, NH 25 WB

4.1 MI FROM RUMNEY TL, Grafton, NH

Built 1965 ADT: 10,000

I-93 SB

Unknown

Over: I-93 NB RAMPS

0.4 MI FROM HOLDERNESS TL, Grafton, NH

Built 1964 ADT: 3,900

I-93 NB

Unknown

Over: I-93 NB RAMPS

0.4 MI FR HOLDERNESS TL, Grafton, NH

Built 1964 ADT: 2,200

I-93 SB

Unknown

Over: MIRROR LAKE ROAD

0.24 MI THORNTON TL, Grafton, NH

Built 1970 ADT: 100

Showing 1-50 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.

Every figure on PlainBridge is rendered directly from federal source data, no number is typed in by an editor. This page draws directly on federal source data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.