State profile · Near median Poor share

New Hampshire bridge safety

Condition ratings, load ratings, and Poor-condition data for every public highway bridge in New Hampshire, based on the FHWA National Bridge Inventory.

2,542
Public bridges
43.0%
Good condition
7.1%
Poor condition

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 whose lowest applicable component is rated 0-4

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 - Poor-condition 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
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 by Poor-condition share (lower share = better)

States are ranked by the share of bridges whose lowest applicable component rating is 4 or below. This describes recorded condition; it does not measure funding effectiveness or live crossing safety. 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 the portal's composite display score. Inspection intervals are risk-based under current NBIS rules.

OLD DEERFIELD ROAD

Poor

Over: BROOK

185 FT FROM NH RTE 43, Rockingham, NH

Built 1920 Load: 1.8 t ADT: 190

TEMPLETON TURNPIKE

Poor

Over: PRIEST BROOK

1.9MI. RTE 119, Cheshire, NH

Built 1984 Load: 2.7 t ADT: 86

DUDLEY ROAD

Poor

Over: LAMPREY RIVER

.23 MI JCT 101, Rockingham, NH

Built 1914 Load: 2.9 t ADT: 535

SHOP ROAD

Poor

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

Poor

Over: PHILLIPS BROOK

100 FT FR SULLIVAN RD 61, Coos, NH

Built 1940 Load: 3.6 t ADT: 90

All Bridges in New Hampshire

NH175

Poor

Over: PEMIGEWASSET RIVER

0.05 MI FROM JCT RTE 3, Grafton, NH

Built 1939 Load: 12.6 t ADT: 664

POND ROAD

Poor

Over: CSX

0.6 MI. KINGSTON TL, Rockingham, NH

Built 1920 Load: 12.6 t ADT: 470

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

CLOTHESPIN BR ROAD

Poor

Over: BLACKWATER RIVER

0.88MI NH127, Merrimack, NH

Built 1954 Load: 14.5 t ADT: 448

NH127

Poor

Over: WARNER RIVER

.5 MI WEBSTER T.L., Merrimack, NH

Built 1937 Load: 14.9 t ADT: 1,550

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

NH 12A

Poor

Over: SUGAR RIVER

.1 MI. FROM JCT. RTE. 103, Sullivan, NH

Built 1967 Load: 15.1 t ADT: 1,051

STAGE ROAD

Poor

Over: BLOW-ME-DOWN BROOK

2.0 MI SE JCT 12A, Sullivan, NH

Built 1954 Load: 15.1 t ADT: 736

NH 1B

Poor

Over: LITTLE HARBOR

1.1 MI JCT RT 1-A, Rockingham, NH

Built 1942 Load: 15.3 t ADT: 3,283

CONTOOCOOK FALLS R

Poor

Over: CONTOOCOOK RIVER

0.3 MI. HENNIKER TL, Hillsborough, NH

Built 1933 Load: 15.4 t ADT: 701

SCRIBNER ROAD

Poor

Over: EXETER RIVER

0.59MI. RTE 107, Rockingham, NH

Built 1941 Load: 15.4 t ADT: 238

POTATO ROAD

Poor

Over: INDIAN RIVER

1.5 MI FROMENFIELD TL, Grafton, NH

Built 1930 Load: 16.0 t ADT: 624

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

TRUE'S BROOK ROAD

Poor

Over: BLOODS BROOK

0.4 MI FR PLAINFIELD TL, Grafton, NH

Built 1952 Load: 16.3 t ADT: 1,068

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

FISH HATCHERY ROAD

Poor

Over: PATCH BROOK

0.17MI NH25, Grafton, NH

Built 1930 Load: 16.3 t ADT: 44

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

COAKLEY ROAD

Poor

Over: HODGSON BROOK

1 MI. WEST OF BYPASS 1, Rockingham, NH

Built 1940 Load: 18.0 t ADT: 469

EAST THETFORD ROAD

Poor

Over: CONNECTICUT RIVER

0.1 MI FROM VERMONT SL, Grafton, NH

Built 1937 Load: 18.1 t ADT: 2,118

US 3

Poor

Over: SOUHEGAN RIVER

0.03 MI FROM RAILROAD AVE, Hillsborough, NH

Built 1921 Load: 18.1 t ADT: 12,781

HILL ROAD

Poor

Over: DARBY BROOK

.08 MI FR DINSMORE HILL, Cheshire, NH

Built 1970 Load: 18.4 t ADT: 90

NH125

Poor

Over: ISINGLASS RIVER

.1 MI BARRINGTON T.L., Strafford, NH

Built 1951 Load: 18.4 t ADT: 14,083

FDR 35

Poor

Over: DOUGLAS BROOK

MAP 32, Carroll, NH

Built 1950 Load: 18.8 t ADT: 50

NH 25

Poor

Over: OLIVERIAN BROOK

1.0 MI HAVERHILL T.L., Grafton, NH

Built 1960 Load: 19.1 t ADT: 1,051

WINDY ROW ROAD

Poor

Over: MCDOWELL RESERVOIR

0.6 MI FR PETERBORO TL, Hillsborough, NH

Built 1950 Load: 19.6 t ADT: 243

US202,NH 9

Poor

Over: ASH BROOK

1 MI FROM CURRIER RD, Merrimack, NH

Built 1970 Load: 19.6 t ADT: 2,807

NH112,KANCAMAGUS

Poor

Over: PEMIGEWASSET RIVER

0.1 MI E JCT ROUTE 3, Grafton, NH

Built 1933 Load: 19.8 t ADT: 6,813

OLD NH 16

Poor

Over: THOMPSON BROOK

0.2 MI EAST JCT NH 16, Coos, NH

Built 1931 Load: 20.0 t ADT: 5

REC AREA ACCESS RD

Poor

Over: OTTER BROOK

8.05 KM N OF KEENE, Cheshire, NH

Built 1967 Load: 20.1 t ADT: 50

REC AREA ACCESS RD

Poor

Over: OTTER BROOK

8.05 KM N OF KEENE, Cheshire, NH

Built 1967 Load: 20.1 t ADT: 50

Showing 2,401-2,450 of 2,542 bridges

Related

All states → | National rankings → | Understanding conditions → | Retired SD term explained →
Data sourced from the FHWA National Bridge Inventory (NBI), latest released cycle. See our methodology for details. Retrieved and formatted by PlainBridges.

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). Poor condition is an inspection-record category, not a closure or unsafe-to-cross designation. Consult the bridge owner for current status.

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.