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

NH 16,SP TPK

Good

Over: JONES ACCESS ROAD

6.6 MI N OF ROCHESTER TL, Strafford, NH

Built 1980 Load: 89.8 t ADT: 14,303

NH 16,SP TPK

Good

Over: AXEHANDLE BROOK

1.2 MI FROM JCT. RT 202A, Strafford, NH

Built 1957 Load: 89.8 t ADT: 28,210

I-89,NH 10 SB

Good

Over: MILLER POND ROAD

4.61 MI SPRINGFIELD T.L., Sullivan, NH

Built 1972 Load: 89.8 t ADT: 10,825

I-89,NH 10 SB

Good

Over: STONY BROOK

5.06 MI SPRINGFIELD TL, Sullivan, NH

Built 1972 Load: 89.8 t ADT: 10,825

OLD NH110

Good

Over: UPPER AMMONOOSUC RIVER

0.22 MI. STARK TL, Coos, NH

Built 2020 Load: 95.4 t ADT: 163

OLD ROUTE 3A

Good

Over: SMITH RIVER

3.54 KM S OF BRISTOL, Grafton, NH

Built 1926 Load: 97.2 t ADT: 50

DEPOT STREET

Good

Over: RELIEF

0.07MI BENNINGTON TL, Hillsborough, NH

Built 2013 Load: 99.9 t ADT: 985

I-93 EBS RAMP

Good

Over: COHAS BROOK

1.6 MI E JCT RTE 28, Hillsborough, NH

Built 1962 Load: 99.9 t ADT: 14,269

GOFFS FALLS ROAD

Good

Over: CSX(ABD)

0.3 MI WEST JCT NH 28, Hillsborough, NH

Built 2021 Load: 99.9 t ADT: 4,456

I-93 NB

Good

Over: COHAS BROOK

.4MI N LONDONDERRY T.L., Hillsborough, NH

Built 1962 Load: 99.9 t ADT: 37,900

SAND HILL ROAD

Good

Over: BROOK

1.4 MI. CROYDON TL, Sullivan, NH

Built 1984 Load: 99.9 t ADT: 156

HELL HOLLOW ROAD

Good

Over: BLOW-ME-DOWN BROOK

0.2 MI FROM CORNISH TL, Sullivan, NH

Built 1975 Load: 99.9 t ADT: 131

SOUTH ROAD

Poor

Over: MINNEWAWA BROOK

0.9 MI FR DUBLIN TL, Cheshire, NH

Built 1950 ADT: 90

STEARNS BROOK ROAD

Poor

Over: STEARNS BROOK

0.4 MI FR SUCCESS TL, Coos, NH

Built 1950 ADT: 90

OLD DEERFIELD ROAD

Poor

Over: BROOK

185 FT FROM NH RTE 43, Rockingham, NH

Built 1920 Load: 1.8 t ADT: 190

WHITCOMB MILLS RD

Poor

Over: WHITE BROOK

0.06 MI FR ARCH ST, Cheshire, NH

Built 1940 Load: 3.6 t ADT: 814

NO DATA ENTERED

Poor

Over: NO DATA ENTERED

NO DATA ENTERED, Carroll, NH

Built 1990 Load: 5.8 t ADT: 10

GLEASON FALLS ROAD

Poor

Over: BEARDS BROOK

2.6 MILE FR NH RTE 9, Hillsborough, NH

Built 1900 Load: 5.9 t ADT: 90

JONES ROAD

Poor

Over: BEARDS BROOK

1.3 MI FR NH RTE 31, Hillsborough, NH

Built 1900 Load: 6.1 t ADT: 90

MURPHY DAM ROAD

Poor

Over: DAM SPILLWAY

0.2 MI FROM US RT 3, Coos, NH

Built 1938 Load: 9.5 t ADT: 90

CRESSY HILL ROAD

Poor

Over: RAND BROOK

0.4MI. LYNDEBORO TL, Hillsborough, NH

Built 1940 Load: 10.4 t ADT: 90

WALKER BROOK ROAD

Poor

Over: FRAZIER BROOK

0.5 MI FR WILMOT T/L, Merrimack, NH

Built 1950 Load: 11.2 t ADT: 74

CORNISH TOLL BR RD

Poor

Over: CONNECTICUT RIVER

VERMONT STATE LINE, Sullivan, NH

Built 1866 Load: 11.8 t ADT: 2,682

CRANE HILL ROAD

Poor

Over: GALE RIVER

TOWN RD, Grafton, NH

Built 1928 Load: 13.4 t ADT: 90

NH 16A

Poor

Over: E BR SACO RIVER

1.9 MI CONWAY TL, Carroll, NH

Built 1928 Load: 13.7 t ADT: 1,041

LAFAYETTE ROAD

Poor

Over: HAM BRANCH

0.12MI. RTE 116, Grafton, NH

Built 1920 Load: 13.7 t ADT: 574

LEAVITT HILL ROAD

Poor

Over: BLOW-ME-DOWN-BROOK

1.4 MI FR CORBIN PARK, Sullivan, NH

Built 1950 Load: 13.7 t ADT: 110

BRIDGE STREET

Poor

Over: NECRR

100 FT FROM NH RTE 12, Sullivan, NH

Built 1992 Load: 14.3 t ADT: 759

NH 12

Poor

Over: NHRR(ABD)

0.3MI TO TROY CENTER, Cheshire, NH

Built 1957 Load: 15.1 t ADT: 7,947

NH127

Poor

Over: BLACKWATER RIVER

4.8 MI FROM WARNER TL, Merrimack, NH

Built 1941 Load: 15.1 t ADT: 1,443

GULF ROAD

Poor

Over: SALMON FALLS RIVER

0.1 MI FROM MAINE SL, Strafford, NH

Built 1950 Load: 15.1 t ADT: 5,994

STAGE ROAD

Poor

Over: BLOW-ME-DOWN BROOK

2.0 MI SE JCT 12A, Sullivan, NH

Built 1954 Load: 15.1 t ADT: 736

CONTOOCOOK FALLS R

Poor

Over: CONTOOCOOK RIVER

0.3 MI. HENNIKER TL, Hillsborough, NH

Built 1933 Load: 15.4 t ADT: 701

BRIDGE STREET

Poor

Over: SPICKET RIVER

1.0MI MASS SL, Rockingham, NH

Built 1900 Load: 16.1 t ADT: 5,463

VILLAGE ROAD

Poor

Over: CLEMENT BROOK

0.5 MI. US2, Coos, NH

Built 1929 Load: 16.3 t ADT: 47

RIVER ROAD

Poor

Over: CLAY BROOK

.23 MI S. PLYMOUTH T.L., Grafton, NH

Built 1900 Load: 16.3 t ADT: 90

PLAINS ROAD

Poor

Over: MILL BROOK

1.0 MI FROM LYMAN TL, Grafton, NH

Built 1975 Load: 16.3 t ADT: 90

ARCHERTOWN ROAD

Poor

Over: JACOBS BROOK

.3 Mi.From NH10, Grafton, NH

Built 1930 Load: 16.3 t ADT: 239

MAIN STREET

Poor

Over: BEAVER BROOK

1.75 MI JCT 128, Hillsborough, NH

Built 1900 Load: 16.3 t ADT: 5,974

NH 11

Poor

Over: NHRR(ABD)

0.6 MI FROM FRANKLIN TL, Merrimack, NH

Built 1929 Load: 16.3 t ADT: 2,622

HANSON ROAD

Poor

Over: EXETER RIVER

75FT. NH102, Rockingham, NH

Built 1932 Load: 16.3 t ADT: 1,690

HILLDALE AVE

Poor

Over: POWWOW RIVER

0.8 MI FR NEWTON TL, Rockingham, NH

Built 1920 Load: 16.3 t ADT: 187

WHITEHALL ROAD

Poor

Over: POWWOW RIVER

0.8 MI FR MASS SL, Rockingham, NH

Built 1976 Load: 16.3 t ADT: 573

SAND HILL ROAD

Poor

Over: BAKER RIVER

.06 MI FROM NH RTE 25, Grafton, NH

Built 1928 Load: 16.8 t ADT: 402

NFSR XH22

Poor

Over: HUBBARD BROOK

MAP 36, Grafton, NH

Built 1961 Load: 16.8 t ADT: 50

NH 28

Poor

Over: SUNCOOK RIVER

AT PEMBROKE TL, Merrimack, NH

Built 1958 Load: 16.8 t ADT: 9,436

WALES BRIDGE ROAD

Poor

Over: SOUCOOK RIVER

1.3 MI FROM CONCORD TL, Merrimack, NH

Built 1934 Load: 16.8 t ADT: 352

WILTON ROAD

Poor

Over: SOUHEGAN RIVER

260FT RTE 31, Hillsborough, NH

Built 1938 Load: 17.2 t ADT: 1,824

BEAVER BROOK ROAD

Poor

Over: BEAVER BROOK

0.4 MI. AMHERST TL, Hillsborough, NH

Built 1932 Load: 17.2 t ADT: 687

MOUNTAIN ROAD

Poor

Over: COLD BROOK

0.7 MI. RTE.25, Carroll, NH

Built 1900 Load: 17.6 t ADT: 41

Showing 2,351-2,400 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.