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

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

GRANITE ROAD

Poor

Over: SOUTH RIVER

0.3MI. RTE 153, Carroll, NH

Built 1920 ADT: 90

MAPLE STREET

Poor

Over: BRANCH RIVER

0.02MI. RTE 153, Carroll, NH

Built 1940 ADT: 90

SOUTH ROAD

Poor

Over: MINNEWAWA BROOK

0.9 MI FR DUBLIN TL, Cheshire, NH

Built 1950 ADT: 90

WHIPPLE HILL ROAD

Poor

Over: ROARING BROOK

0.5 MI. RTE.119, Cheshire, NH

Built 1950 ADT: 331

CHRISTIAN HILL RD

Poor

Over: NHRR(ABD)

50 FT FROM SOUTH GROVE S, Cheshire, NH

Built 1930 ADT: 2,159

BRIDGE STREET

Poor

Over: CONNECTICUT RIVER

VERMONT STATE LINE, Cheshire, NH

Built 1930 ADT: 6,100

STEARNS BROOK ROAD

Poor

Over: STEARNS BROOK

0.4 MI FR SUCCESS TL, Coos, NH

Built 1950 ADT: 90

GRIST MILL HILL RD

Poor

Over: INDIAN RIVER

2.01 MI FROM GRAFTON TL, Grafton, NH

Built 1956 ADT: 404

HIGH BRIDGE ROAD

Poor

Over: ARCHERTOWN BROOK

150FT W TILLOTSON RD JCT, Grafton, NH

Built 1940 ADT: 90

THORNTONS FERRY RD

Poor

Over: BEAVER BROOK

3.2 MI FR MERRIMACK TL, Hillsborough, NH

Built 1970 ADT: 388

OLD COUNTY RD N

Poor

Over: COLLINS BROOK

2.4 MI. DEERING TL, Hillsborough, NH

Built 1981 ADT: 90

DOUGHERTY LANE

Poor

Over: MID BR PISCATAQUOG RIVER

0.8 MI FR SANDERS HILL R, Hillsborough, NH

Built 2004 ADT: 90

TOWNHOUSE ROAD

Poor

Over: NORTHEAST POND

NH-ME SL, Strafford, NH

Built 1948 ADT: 554

PARADISE ROAD

Poor

Over: SUGAR RIVER

380 FT. RTE.11, Sullivan, NH

Built 1976 ADT: 90

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

RIVER ROAD

Poor

Over: MAD RIVER

0.63MI. RTE 111, Strafford, NH

Built 1986 Load: 3.6 t ADT: 108

JOHNSON HILL ROAD

Poor

Over: WEST BRANCH BROOK

1.5 MI MARSHALL HILL RD, Merrimack, NH

Built 1950 Load: 5.4 t ADT: 90

OAK STREET

Poor

Over: CSX

DOVER-ROLLINSFORD TL, Strafford, NH

Built 1890 Load: 5.4 t ADT: 8,552

NO DATA ENTERED

Poor

Over: NO DATA ENTERED

NO DATA ENTERED, Carroll, NH

Built 1990 Load: 5.8 t ADT: 10

PUTNAM ROAD

Poor

Over: BROOK

TOWN RD, Hillsborough, NH

Built 1930 Load: 5.8 t ADT: 90

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

ON-ORBIT DRIVE

Poor

Over: GARDNER-JOE ENGLISH STRE

1.2 MILES FROM MAIN GATE., Hillsborough, NH

Built 1959 Load: 6.3 t ADT: 10

CENTENARY AVENUE

Poor

Over: NHRR

TOWN RD, Belknap, NH

Built 1940 Load: 8.0 t ADT: 90

CHICKWOLNEPY ROAD

Poor

Over: CHICKWOLNEPY STREAM

1.2 M FR E. SIDE RIVER RD, Coos, NH

Built 1950 Load: 8.0 t ADT: 90

RIVER ROAD

Poor

Over: PISCATAQUOG RIVER

0.5 MI FROM NH 77, Hillsborough, NH

Built 1940 Load: 8.2 t ADT: 1,824

MURPHY DAM ROAD

Poor

Over: DAM SPILLWAY

0.2 MI FROM US RT 3, Coos, NH

Built 1938 Load: 9.5 t ADT: 90

TEMPLE ROAD

Poor

Over: BLOOD BROOK

0.02 MI SW JCT NH101, Hillsborough, NH

Built 1901 Load: 9.8 t ADT: 1,214

CATE STREET

Poor

Over: HODGSON BROOK

.2 WEST OF BARTLETT St., Rockingham, NH

Built 1940 Load: 10.0 t ADT: 1,340

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

GRIFFIN MILL ROAD

Poor

Over: MAPLE FALLS BROOK

300 YDS N. OF NH 121, Rockingham, NH

Built 1850 Load: 12.4 t ADT: 187

Showing 2,351-2,400 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.