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

CONCORD ROAD

Good

Over: AMEY BROOK

2.2 MI FR HOPKINTON TL, Merrimack, NH

Built 1938 Load: 40.8 t ADT: 1,955

GOOSE HOLE ROAD

Good

Over: BROOK

0.36 MI. SPRINGFIELD TL, Merrimack, NH

Built 1930 Load: 40.8 t ADT: 90

TWIN BRIDGE ROAD

Good

Over: WHICHIER BROOK

40 FT FR BELMONT TL, Merrimack, NH

Built 1998 Load: 40.8 t ADT: 90

NH107

Good

Over: SUNCOOK RIVER

5.4 MI FROM NORTHWOOD TL, Merrimack, NH

Built 1997 Load: 40.8 t ADT: 2,858

I-93 SB

Good

Over: RECREATION TRAIL

1.5 MI S MANCHESTER LINE, Rockingham, NH

Built 2013 Load: 40.8 t ADT: 39,949

I-93 NB

Good

Over: RECREATION TRAIL

1.5 M, S MANCHETER CL, Rockingham, NH

Built 2014 Load: 40.8 t ADT: 35,850

NH 1A

Good

Over: LITTLE RIVER

50 FEET SOUTH NH111, Rockingham, NH

Built 2000 Load: 40.8 t ADT: 4,214

NH152

Good

Over: NORTH RIVER

.45MI. SE NORTHWOOD TL, Rockingham, NH

Built 1994 Load: 40.8 t ADT: 2,664

BLUEBERRY HILL RD

Good

Over: EXETER RIVER

0.19 MI FROM NH RTE 102, Rockingham, NH

Built 1987 Load: 40.8 t ADT: 728

PRESCOTT ROAD

Good

Over: LAMPREY RIVER

0.07 MI FR RIVERSIDE DR, Rockingham, NH

Built 1990 Load: 40.8 t ADT: 819

NH 16,SP TPK SB

Good

Over: BMRR

.4 MI. FROM JCT. RT 9, Strafford, NH

Built 1957 Load: 40.8 t ADT: 23,076

NH108

Good

Over: OYSTER RIVER

.2 MI FR JCT. RTE. 4, Strafford, NH

Built 1991 Load: 40.8 t ADT: 11,709

SPAULDING AVENUE

Good

Over: SALMON FALLS RIVER

MAINE SL, Strafford, NH

Built 1990 Load: 40.8 t ADT: 990

NH125

Good

Over: AXE HANDLE BROOK

.1 MI FROM JCT SP. TPK., Strafford, NH

Built 1983 Load: 40.8 t ADT: 16,118

NH 12A

Good

Over: NECRR

0.4 MI EAST ROUTE 12, Sullivan, NH

Built 2000 Load: 40.8 t ADT: 1,438

DANIELS ROAD

Good

Over: BLOW-ME-DOWN BROOK

0.4 MI FROM NH RTE 12A, Sullivan, NH

Built 2002 Load: 40.8 t ADT: 273

TREATMENT ROAD

Good

Over: SUGAR RIVER

0.06 MI N NH 11, Sullivan, NH

Built 2009 Load: 40.8 t ADT: 90

VALLEY ROAD

Good

Over: HIGHLAND LAKE INLET

150' SOUTHEAST OF COVE RO, Sullivan, NH

Built 2015 Load: 40.8 t ADT: 90

DOLE SCHOOL HS RD

Good

Over: HIGHLAND LAKE OUTLET

0.09MI NH 31, Sullivan, NH

Built 2012 Load: 40.8 t ADT: 90

CHESLEY HILL ROAD

Good

Over: AXE HANDLE BROOK

CITY ST, Strafford, NH

Built 2008 Load: 41.0 t ADT: 566

JEFFERSON NOTCH RD

Good

Over: AMMONOOSUC RIVER

.4MIJCT 42 + 44, Coos, NH

Built 1982 Load: 41.2 t ADT: 90

CAMPGROUND ROAD

Good

Over: MOOSE BROOK

.25 MI S JIM TOWN ROAD, Coos, NH

Built 1964 Load: 41.2 t

US 3

Good

Over: KIMBALL BROOK

8.5 MI TO NORTHUMBERLAND, Coos, NH

Built 1956 Load: 41.2 t ADT: 2,621

RUDDSBORO ROAD

Good

Over: MINK BROOK

4.2 MI FR LEBANON TL, Grafton, NH

Built 1940 Load: 41.2 t ADT: 90

I-93 SB

Good

Over: US 3

0.9 MI FROM HOLDERNESS TL, Grafton, NH

Built 1964 Load: 41.2 t ADT: 10,181

I-93 NB

Good

Over: US 3

0.9 MI FROM HOLDERNESS TL, Grafton, NH

Built 1964 Load: 41.2 t ADT: 10,268

STEELE BRIDGE ROAD

Good

Over: MILL BROOK

190 FT FROM MILLBROOK RD, Grafton, NH

Built 2003 Load: 41.2 t ADT: 90

BIRCHDALE ROAD

Good

Over: WHITE BROOK

1.25 MI SE JCT NH 13, Merrimack, NH

Built 2018 Load: 41.2 t ADT: 459

COURT STREET

Good

Over: ASHUELOT RIVER

2.3 MI FROM KEENE CENTER, Cheshire, NH

Built 2010 Load: 41.3 t ADT: 8,625

MERIDEN HILL ROAD

Good

Over: LYMAN BROOK

0.7 MI FROM US RTE 3, Coos, NH

Built 2014 Load: 41.3 t ADT: 134

BRIDGE HILL ROAD

Good

Over: CONNECTICUT RIVER

NH-VT STATE LINE, Coos, NH

Built 1997 Load: 41.3 t ADT: 857

NH 9

Good

Over: BMRR

2 MI. FROM MADBURY TL6, Strafford, NH

Built 2011 Load: 41.3 t ADT: 11,839

COLD RIVER ROAD

Good

Over: GREAT BROOK

0.5MI WALPOLE TL, Sullivan, NH

Built 1982 Load: 41.3 t ADT: 90

BRAEMOOR WOODS RD

Good

Over: SPICKET RIVER TRIBUTARY

4 TENTHS MIL EAST NH 28, Hillsborough, NH

Built 2006 Load: 41.4 t ADT: 446

US302

Good

Over: SAWYER RIVER

1.8 MI FROM BARTLETT TL, Carroll, NH

Built 2013 Load: 41.5 t ADT: 2,768

FDR 34

Good

Over: WHITEFACE BROOK

MAP 32, Carroll, NH

Built 2005 Load: 41.5 t ADT: 50

WASHBURN ROAD

Good

Over: MOHAWK RIVER

110 FT FROM NH RTE 26, Coos, NH

Built 1920 Load: 41.5 t ADT: 90

NH123,NH124

Good

Over: SOUHEGAN RIVER, BYP HIST

1.4 MI FROM GREENVILLE TL, Hillsborough, NH

Built 2015 Load: 41.5 t ADT: 5,402

BRADFORD STREET

Good

Over: TRIBUTARY G

DERRY, Rockingham, NH

Built 2006 Load: 41.5 t ADT: 989

WHITTIER STREET

Good

Over: COCHECO RIVER

OFF DOWNTOWN DOVER, Strafford, NH

Built 2018 Load: 41.5 t ADT: 4,293

CROSS ROAD

Good

Over: GUNNISON BROOK

AT JCT OF BROOK RD, Sullivan, NH

Built 2013 Load: 41.5 t ADT: 90

COFFIN BROOK ROAD

Good

Over: COFFIN BROOK

1.0 MI NH 140, Belknap, NH

Built 1999 Load: 41.6 t ADT: 90

FAIR STREET

Good

Over: WINNIPESAUKEE RIVER

0.6 MI BELMONT T.L., Belknap, NH

Built 1972 Load: 41.6 t ADT: 6,253

PERCH POND ROAD

Good

Over: BEEBE RIVER

3.1 MI FROM HOLDERNESS T, Grafton, NH

Built 1988 Load: 41.6 t ADT: 246

COOPER ROAD

Good

Over: GEORGES BROOK

0.3 MI FR NORTH SHORE RD, Grafton, NH

Built 1999 Load: 41.6 t ADT: 64

I-293,FEE TPK

Good

Over: GRANITE STREET

0.7 MI N JCT RT 3, Hillsborough, NH

Built 2007 Load: 41.6 t ADT: 50,190

FAIRGROUNDS ROAD

Good

Over: WEST BRANCH BROOK

0.03 MI FR JOHNSON HILL R, Merrimack, NH

Built 2003 Load: 41.6 t ADT: 90

GREY ROCKS ROAD

Good

Over: NHRR

0.3 MI FROM TILTON TL, Belknap, NH

Built 2000 Load: 41.7 t ADT: 480

NH112,KANCAMAGUS

Good

Over: OLIVERIAN BROOK

1.7 MI FROM WATERVILLE, Carroll, NH

Built 1963 Load: 41.7 t ADT: 3,016

EMERSON ROAD

Good

Over: UPPER AMMONOOSUC RIVER

1.04 MI FR NORTHUMBERLAN, Coos, NH

Built 1982 Load: 41.7 t ADT: 90

Showing 1,701-1,750 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.