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

ANTRIM ROAD

Poor

Over: MONADNOCK MILL CANAL

0.39 MI FR CONTOOCOOK VA, Hillsborough, NH

Built 1922 Load: 28.9 t ADT: 2,291

RIVER ROAD SOUTH

Poor

Over: PARTRIDGE BROOK

0.72 MI NH63, Cheshire, NH

Built 1937 Load: 29.2 t ADT: 1,214

US 3

Poor

Over: BOG BROOK

1.2 MI FROM PLYMOUTH TL, Grafton, NH

Built 1929 Load: 29.4 t ADT: 1,326

US 4

Poor

Over: BLACKWATER RIVER

0.3 MI FROM SALISBURY TL, Merrimack, NH

Built 1933 Load: 29.8 t ADT: 2,600

NH 32

Poor

Over: MARTIN BROOK

1.48 MI. N. RICHMOND TL, Cheshire, NH

Built 1929 Load: 30.0 t ADT: 2,912

NH152

Poor

Over: NORTH RIVER

5.15MI. NW LEE TL, Rockingham, NH

Built 1925 Load: 30.2 t ADT: 3,415

NH 11

Poor

Over: MERRYMEETING RIVER

8.5 MI FROM GILFORD TL, Belknap, NH

Built 1934 Load: 30.6 t ADT: 10,193

PERCH POND ROAD

Poor

Over: RYAN BROOK

1.9 MI FR HOLDERNESS TL, Grafton, NH

Built 1940 Load: 30.7 t ADT: 90

NH 12

Poor

Over: NECRR

4.9 MI. FROM WALPOLE TL, Sullivan, NH

Built 1959 Load: 31.0 t ADT: 3,766

NH 9(LOUDON ROAD)

Poor

Over: MERRIMACK RIVER

0.1 MI EAST JCT I-93, Merrimack, NH

Built 1966 Load: 31.7 t ADT: 23,188

NH 25A

Poor

Over: BRACKETT BROOK

9.9 MI FROM VERMONT SL, Grafton, NH

Built 1929 Load: 32.3 t ADT: 805

NH 11

Poor

Over: SUCKER BROOK

0.4 MI FROM FRANKLIN T.L., Merrimack, NH

Built 1929 Load: 32.3 t ADT: 2,622

NH 11

Poor

Over: SUCKER BROOK

.3 MI FROM FRANKLIN T.L., Merrimack, NH

Built 1929 Load: 32.3 t ADT: 2,622

FOWLER RIVER ROAD

Poor

Over: FOWLER RIVER

5.2MI FR TUFTONBORO TL, Grafton, NH

Built 1930 Load: 32.7 t ADT: 234

NH120,PARK LOT,PED

Poor

Over: NHRR(ABD)

.1 MI FROM JCT RTE 4, Grafton, NH

Built 1969 Load: 32.7 t ADT: 7,709

NH 18

Poor

Over: CONNECTICUT RIVER

NH-VT SL, Grafton, NH

Built 1934 Load: 32.7 t ADT: 1,486

NH 49

Poor

Over: MAD RIVER

1.9 MI SW WATERVILLE T L, Grafton, NH

Built 1979 Load: 32.7 t ADT: 2,786

BEALS ROAD

Poor

Over: BABOOSIC BROOK

33 FT FR MERRIMACK TL, Hillsborough, NH

Built 1928 Load: 32.7 t ADT: 481

HALL ROAD

Poor

Over: LITTLE COHAS BROOK

0.73 MI FR HARVEY RD, Rockingham, NH

Built 1974 Load: 32.7 t ADT: 1,920

PLAINS ROAD

Poor

Over: SUGAR RIVER

0.1 MI JCT RTE 12, Sullivan, NH

Built 1974 Load: 32.7 t ADT: 1,356

US 4,MECHANIC ST

Poor

Over: MASCOMA RIVER

5.4 MI FROM HANOVER TL, Grafton, NH

Built 1977 Load: 32.8 t ADT: 12,552

DUPAW GOULD ROAD

Poor

Over: LANCY BROOK

1.4 MI FR MCINTOSH RD, Hillsborough, NH

Built 1987 Load: 33.0 t ADT: 443

SPRING STREET

Poor

Over: COCHECO RIVER

1.38MI RTE 11, Strafford, NH

Built 1926 Load: 33.5 t ADT: 759

I-89 SB

Poor

Over: CONNECTICUT RIVER,NECRR

0.04 MI FROM VT. SL., Grafton, NH

Built 1966 Load: 33.8 t ADT: 20,851

I-89 NB

Poor

Over: CONNECTICUT RIVER,NECRR

0.04 MI FROM VT SL., Grafton, NH

Built 1966 Load: 33.8 t ADT: 21,851

LAST STREET

Poor

Over: SUCKER BROOK

0.03 MI NH 11, Merrimack, NH

Built 1936 Load: 35.9 t ADT: 90

NH 11

Poor

Over: POOR FARM BROOK

1.7 MI S ALTON TL, Belknap, NH

Built 1966 Load: 37.2 t ADT: 5,454

TIRRELL HILL ROAD

Poor

Over: BLACK BROOK

1.9MI Fr Goffstwn Back RD, Hillsborough, NH

Built 1994 Load: 37.2 t ADT: 1,273

FDR 304

Poor

Over: LITTLE RIVER

MAP 10, Grafton, NH

Built 1975 Load: 37.3 t ADT: 50

RECYCLE WAY

Poor

Over: ASHUELOT RIVER

0.04MI NH119, Cheshire, NH

Built 1947 Load: 37.6 t ADT: 25

SCHOOL STREET

Poor

Over: AMMONOOSUC RIVER

214 FT FROM NH RTE 112, Grafton, NH

Built 1960 Load: 38.1 t ADT: 1,702

NH119

Poor

Over: CONNECTICUT RIVER

0.3 MI E VERMONT SL, Cheshire, NH

Built 1920 Load: 38.6 t ADT: 8,409

NH 31

Poor

Over: STONY BROOK

0.1 MI FM LYNDEBOROUGH TL, Hillsborough, NH

Built 1929 Load: 39.2 t ADT: 3,444

SHEPARD HOME ROAD

Poor

Over: EXETER RIVER

0.8MI. NH102, Rockingham, NH

Built 1986 Load: 39.2 t ADT: 446

NH 12

Poor

Over: S BRANCH ASHUELOT RIVER

1.5 MI S TO TROY CENTER, Cheshire, NH

Built 1941 Load: 41.7 t ADT: 8,843

WASHBURN ROAD

Poor

Over: PATTEN BROOK

8.11 MI FROM E HILL RD, Grafton, NH

Built 1950 Load: 44.7 t ADT: 314

BROOK ROAD

Poor

Over: SALMON BROOK

0.1 MI FROM HALE RD, Belknap, NH

Built 1900 Load: 45.4 t ADT: 90

I-89 SB

Poor

Over: TURKEY POND

1.5 MI NW JCT RT 13, Merrimack, NH

Built 1959 Load: 47.4 t ADT: 19,873

I-89 NB

Poor

Over: TURKEY POND

1.5 MI NW OF JCT RT 13, Merrimack, NH

Built 1959 Load: 47.4 t ADT: 19,523

FRYE MILL ROAD

Poor

Over: BURTON POND OUTLET

1.2Mi.Fr.Issac Frye Hwy., Hillsborough, NH

Built 1920 Load: 51.8 t ADT: 35

CARLETON HILL ROAD

Poor

Over: MOHAWK RIVER

0.15 MI SE JCT NH 26, Coos, NH

Built 1935 Load: 55.1 t ADT: 425

MAPLE AVE

Poor

Over: BLACK BROOK

DOWNTOWN KEENE, Cheshire, NH

Built 1961 Load: 89.8 t ADT: 3,140

Showing 2,501-2,542 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.