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

NH121A

Good

Over: EXETER RIVER

2.85 MI. SE CHESTER TL, Rockingham, NH

Built 1937 Load: 74.1 t ADT: 3,677

NH107

Good

Over: GRIFFIN BROOK

DEERFIELD TL, Merrimack, NH

Built 2010 Load: 74.7 t ADT: 3,315

NH 11,NH103

Good

Over: RAM BROOK

2.01 MI. E. CLAREMONT TL, Sullivan, NH

Built 2008 Load: 74.8 t ADT: 9,812

I-93 SB

Good

Over: EASTMAN BROOK

2.51 MI THORNTON TL, Grafton, NH

Built 1972 Load: 75.1 t ADT: 7,060

WENTWORTH ROAD

Good

Over: BROOK

DANBURY TL, Grafton, NH

Built 1989 Load: 75.3 t ADT: 90

NH 10

Good

Over: MINK BROOK

0.2 MI FROM LEBANON TL, Grafton, NH

Built 2006 Load: 75.4 t ADT: 6,076

BLUFF STREET

Good

Over: HITTYTITY BROOK

2.3 MI FROM MASS. SL, Rockingham, NH

Built 2013 Load: 77.6 t ADT: 2,269

MILL ROAD

Good

Over: GREAT BROOK

0.22 MI FR OLD KEENE RD, Cheshire, NH

Built 2010 Load: 78.0 t ADT: 240

WILLEY ROAD

Good

Over: WEST BRANCH BROOK

0.5 MI FROM ELSWTH PD RD, Grafton, NH

Built 2009 Load: 79.7 t ADT: 90

I-93 SB

Good

Over: CONNECTOR ROAD

0.18 MI N WOODSTOCK TL, Grafton, NH

Built 1973 Load: 79.8 t ADT: 5,027

NH114

Good

Over: STOCKER BROOK

.78 MI. EAST OF JCT. NH10, Sullivan, NH

Built 1929 Load: 80.2 t ADT: 1,519

FDR 19

Good

Over: JEFFERS BROOK

MAP 35, Grafton, NH

Built 2001 Load: 80.4 t ADT: 50

I-93 NB

Good

Over: CONNECTOR ROAD

0.23 MI N WOODSTOCK TL, Grafton, NH

Built 1973 Load: 80.7 t ADT: 5,375

NH 9

Good

Over: BOYS CAMP ROAD

1.0 MI WEST STODDARD TL, Cheshire, NH

Built 1994 Load: 81.1 t ADT: 6,028

US 4,NH 16,SP TPK

Good

Over: SHAWAYTTUCK

2.5 MI FROM PORTSMOUTH T, Rockingham, NH

Built 1983 Load: 81.6 t ADT: 66,702

WAUKEWAN RD

Good

Over: WAUKEWAN LAKE INLET

NEW HAMPTON T/L, Belknap, NH

Built 2022 Load: 81.8 t ADT: 478

MANCHESTER ROAD

Good

Over: BEAVER BROOK

0.5 MI JCT 101, Hillsborough, NH

Built 2015 Load: 81.8 t ADT: 948

FDR 19

Good

Over: JEFFERS BROOK

MAP 35, Grafton, NH

Built 2001 Load: 83.6 t ADT: 50

HIGH HAITH ROAD

Good

Over: SQUAM LAKE CHANNEL

0.5 MI FR SQUAM LAKE RD, Belknap, NH

Built 2010 Load: 83.9 t ADT: 267

NH 10

Good

Over: ABBOTT BROOK

1.9 MI. FROM GILSUM TL, Cheshire, NH

Built 1964 Load: 84.5 t ADT: 1,841

MALLEGO ROAD

Good

Over: MALLEGO BROOK

0.7 MI FR RTE 125&9, Strafford, NH

Built 2020 Load: 84.7 t ADT: 722

BROAD BROOK ROAD

Good

Over: BROAD BROOK

0.4 MI. FROM JCT. NH 10, Cheshire, NH

Built 1900 Load: 85.1 t ADT: 90

GRIFFIN ROAD

Good

Over: GRIFFIN BROOK

1/4 MI CENTER HILL RD JCT, Merrimack, NH

Built 2008 Load: 85.3 t ADT: 90

NH 10

Good

Over: ASH SWAMP BROOK

4.3 MI. N. OF NEWPORT TL, Sullivan, NH

Built 1927 Load: 86.0 t ADT: 3,480

STAGE COACH ROAD

Good

Over: BURTON POND OUTLET

TOWN RD, Hillsborough, NH

Built 2021 Load: 86.2 t ADT: 90

NORTH PEMBROKE RD

Good

Over: SOUCOOK RIVER

AT PEMBROKE TL, Merrimack, NH

Built 1959 Load: 86.5 t ADT: 4,598

DEPOT STREET

Good

Over: CONTOOCOOK RIVER

AT BENNINGTON TL, Hillsborough, NH

Built 2013 Load: 87.5 t ADT: 1,970

AREA ROAD

Good

Over: POOR FARM BROOK

0.16 Mi. From NH RTE 11-A, Belknap, NH

Built 2011 Load: 89.0 t ADT: 160

NH 16

Good

Over: CHOCORUA RIVER

7.1 MI FROM OSSIPEE T.L., Carroll, NH

Built 1939 Load: 89.8 t ADT: 7,428

NH 25,NH113

Good

Over: SANGER BROOK

3.4 MI FROM OSSIPEE TL, Carroll, NH

Built 1986 Load: 89.8 t ADT: 5,018

HIGH STREET

Good

Over: MELVIN RIVER

0.2 MI. RTE.109, Carroll, NH

Built 1977 Load: 89.8 t ADT: 263

NH 12

Good

Over: BEAVER BROOK

.97 MI NW SWANZEY TL, Cheshire, NH

Built 2019 Load: 89.8 t ADT: 19,665

POOCHAM ROAD

Good

Over: OX BROOK

2.35 MI CHESTERFLD TL, Cheshire, NH

Built 1984 Load: 89.8 t ADT: 90

RIVER ROAD

Good

Over: OX BROOK

1.8 Mi Fr. NH 63, Cheshire, NH

Built 1986 Load: 89.8 t ADT: 362

NH 12

Good

Over: WHITE BRIDGE BROOK

1.3 MI SURRY TL, Cheshire, NH

Built 1941 Load: 89.8 t ADT: 6,382

US 3

Good

Over: CARROLL STREAM

3.4 MI S WHITEFIELD T/L, Coos, NH

Built 1957 Load: 89.8 t ADT: 3,070

US 2

Good

Over: MOOSE RIVER

3.6 MI FROM JEFFERSON TL, Coos, NH

Built 1966 Load: 89.8 t ADT: 5,144

US 3

Good

Over: STRATFORD BOG BROOK

0.9 MI NORTHUMBERLAND TL, Coos, NH

Built 2001 Load: 89.8 t ADT: 2,993

ELLSWORTH POND RD

Good

Over: ELLSWORTH POND OUTLET

4.9 MI S RUMNEY TL, Grafton, NH

Built 1986 Load: 89.8 t ADT: 69

KING ROAD

Good

Over: MINK BROOK

1.0 MI FROM GREENSBORO R, Grafton, NH

Built 1973 Load: 89.8 t ADT: 90

I-93 NB

Good

Over: INDIAN CREEK

0.9 MI FRANCONIA TL, Grafton, NH

Built 1972 Load: 89.8 t ADT: 2,684

MILL BROOK ROAD

Good

Over: MILL BROOK

20' WEST OF BR. #165/151, Grafton, NH

Built 2019 Load: 89.8 t ADT: 90

WELLINGTON ROAD

Good

Over: VALLEY BROOK

0.1 MILE W OF NH 28 BYP, Hillsborough, NH

Built 2013 Load: 89.8 t ADT: 13,819

BODWELL ROAD

Good

Over: COHAS BROOK

0.3 MI N LONDONDERRY TL, Hillsborough, NH

Built 1984 Load: 89.8 t ADT: 2,518

US 3

Good

Over: NHRR(ABD)

3.2 MI FRANKLIN TL, Merrimack, NH

Built 1955 Load: 89.8 t ADT: 9,836

NH111

Good

Over: SPICKET RIVER

0.3 MI W ATKINSON TL, Rockingham, NH

Built 1978 Load: 89.8 t ADT: 15,832

NH125

Good

Over: NORTH RIVER

0.1 MI. S. JCT. 155, Rockingham, NH

Built 1977 Load: 89.8 t ADT: 16,427

NH 33

Good

Over: CSX

0.75 MI FROM JCT I-95, Rockingham, NH

Built 2010 Load: 89.8 t ADT: 15,705

I-93 REST EXIT

Good

Over: POLICY BROOK

REST AREA EXIT ROAD, Rockingham, NH

Built 1967 Load: 89.8 t ADT: 1,800

I-93 REST ENTRANCE

Good

Over: POLICY BROOK

REST AREA ENTRANCE ROAD, Rockingham, NH

Built 1967 Load: 89.8 t ADT: 1,800

Showing 2,301-2,350 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.