State profile · Near median Poor share

New Hampshire bridge safety

According to the Federal Highway Administration's 2024 National Bridge Inventory, condition ratings, load ratings, and Poor-condition shares for every public highway bridge in New Hampshire.

2,542
Public bridges
51.6%
Good condition
7.5%
Poor condition

New Hampshire holds 2,542 public highway bridges (#44 of 52 by inventory) with a 7.51% Poor share (#18 of 52 by Poor share).

That is 7.5% of the state's inventory, against an average of 7.5% across the 54 states and territories with Poor-rated bridges on file, which places it 35 of 54 ordered from the lowest Poor share upward. A bridge is rated Poor when its weakest applicable component scores 4 or below on the inspecting agency's 0-9 scale, so the category is a maintenance and funding signal rather than a closure order or a live crossing-safety verdict.

Inventory: FHWA NBI 2024 · last ETL August 2026

Total Bridges

2,542

Public highway bridges in New Hampshire

Good Condition

51.6%

1,312 bridges rated 7-9

1.6pp vs 50% benchmark

Poor Condition

7.5%

191 bridges whose lowest applicable component is rated 0-4

-0.0pp vs national avg 7.5%

New Hampshire vs national bridge condition

New Hampshire - Good condition share 51.6%
National avg

Share of bridges rated 7-9 on the FHWA 0-9 scale (deck, superstructure, substructure all good).

New Hampshire - Poor-condition share 25.0%
National avg

Lower is better. Bar maxes at 30% (worst-state ceiling). National average sits at 7.5%.

New Hampshire in the national condition pattern

Each point is a state or territory in the FHWA NBI; the highlighted point is this profile.

Inventory size and Poor-condition share are different measures: New Hampshire has 2,542 bridges and a 7.5% Poor-condition share in the 2024 NBI, rank #35 of 54 jurisdictions ordered from the lowest share upward. The dashed comparisons mark the national average state rate and the midpoint of the plotted inventory range; neither is a live safety or closure threshold. Scatter plot of 54 data points. 0%10%20%30%40% 0k20k40k60k Public bridges in inventory (thousands) Poor-condition share (%) NH, Public bridges in inventory (thousands): 2.5k · Poor-condition share (%): 7.51%AL, Public bridges in inventory (thousands): 16.2k · Poor-condition share (%): 3.35%AK, Public bridges in inventory (thousands): 1.7k · Poor-condition share (%): 7.89%AZ, Public bridges in inventory (thousands): 8.6k · Poor-condition share (%): 1.15%AR, Public bridges in inventory (thousands): 13k · Poor-condition share (%): 5.43%CA, Public bridges in inventory (thousands): 25.8k · Poor-condition share (%): 5.91%CO, Public bridges in inventory (thousands): 9k · Poor-condition share (%): 4.82%CT, Public bridges in inventory (thousands): 4.4k · Poor-condition share (%): 4.72%DE, Public bridges in inventory (thousands): 0.9k · Poor-condition share (%): 1.26%DC, Public bridges in inventory (thousands): 0.3k · Poor-condition share (%): 1.95%FL, Public bridges in inventory (thousands): 13k · Poor-condition share (%): 2.79%GA, Public bridges in inventory (thousands): 15.1k · Poor-condition share (%): 1.59%GU, Public bridges in inventory (thousands): 0k · Poor-condition share (%): 12.77%HI, Public bridges in inventory (thousands): 1.2k · Poor-condition share (%): 6.53%ID, Public bridges in inventory (thousands): 4.6k · Poor-condition share (%): 4.9%IL, Public bridges in inventory (thousands): 26.9k · Poor-condition share (%): 9.35%IN, Public bridges in inventory (thousands): 19.5k · Poor-condition share (%): 5.22%IA, Public bridges in inventory (thousands): 23.7k · Poor-condition share (%): 19.16%KS, Public bridges in inventory (thousands): 24.9k · Poor-condition share (%): 5.26%KY, Public bridges in inventory (thousands): 14.5k · Poor-condition share (%): 7.37%LA, Public bridges in inventory (thousands): 12.7k · Poor-condition share (%): 11.48%ME, Public bridges in inventory (thousands): 2.5k · Poor-condition share (%): 15.41%MD, Public bridges in inventory (thousands): 5.5k · Poor-condition share (%): 4.56%MA, Public bridges in inventory (thousands): 5.3k · Poor-condition share (%): 8.88%MI, Public bridges in inventory (thousands): 11.4k · Poor-condition share (%): 11.27%MN, Public bridges in inventory (thousands): 13.5k · Poor-condition share (%): 4.44%MS, Public bridges in inventory (thousands): 16.7k · Poor-condition share (%): 6.03%MO, Public bridges in inventory (thousands): 24.6k · Poor-condition share (%): 8.95%MT, Public bridges in inventory (thousands): 5.2k · Poor-condition share (%): 6.81%NE, Public bridges in inventory (thousands): 15.4k · Poor-condition share (%): 7.9%NV, Public bridges in inventory (thousands): 2.1k · Poor-condition share (%): 1.14%NJ, Public bridges in inventory (thousands): 6.8k · Poor-condition share (%): 6.01%NM, Public bridges in inventory (thousands): 4k · Poor-condition share (%): 4.51%NY, Public bridges in inventory (thousands): 17.6k · Poor-condition share (%): 9.43%NC, Public bridges in inventory (thousands): 19.2k · Poor-condition share (%): 6.76%ND, Public bridges in inventory (thousands): 4.3k · Poor-condition share (%): 10.98%OH, Public bridges in inventory (thousands): 26.7k · Poor-condition share (%): 4.74%OK, Public bridges in inventory (thousands): 22.9k · Poor-condition share (%): 7.7%OR, Public bridges in inventory (thousands): 8.3k · Poor-condition share (%): 4.61%PA, Public bridges in inventory (thousands): 23.3k · Poor-condition share (%): 12.58%PR, Public bridges in inventory (thousands): 2.4k · Poor-condition share (%): 13.92%RI, Public bridges in inventory (thousands): 0.8k · Poor-condition share (%): 15.2%SC, Public bridges in inventory (thousands): 9.5k · Poor-condition share (%): 6.17%SD, Public bridges in inventory (thousands): 5.9k · Poor-condition share (%): 16.36%TN, Public bridges in inventory (thousands): 20.4k · Poor-condition share (%): 4.41%TX, Public bridges in inventory (thousands): 56.7k · Poor-condition share (%): 1.23%UT, Public bridges in inventory (thousands): 3.1k · Poor-condition share (%): 2.91%VT, Public bridges in inventory (thousands): 2.9k · Poor-condition share (%): 2.9%VI, Public bridges in inventory (thousands): 0k · Poor-condition share (%): 29.17%VA, Public bridges in inventory (thousands): 14.1k · Poor-condition share (%): 3.39%WA, Public bridges in inventory (thousands): 8.5k · Poor-condition share (%): 5.45%WV, Public bridges in inventory (thousands): 7.3k · Poor-condition share (%): 18.64%WI, Public bridges in inventory (thousands): 14.4k · Poor-condition share (%): 6.52%WY, Public bridges in inventory (thousands): 3.1k · Poor-condition share (%): 6.51%
Inventory size and Poor-condition share are different measures: New Hampshire has 2,542 bridges and a 7.5% Poor-condition share in the 2024 NBI, rank #35 of 54 jurisdictions ordered from the lowest share upward. The dashed comparisons mark the national average state rate and the midpoint of the plotted inventory range; neither is a live safety or closure threshold.

New Hampshire vs all states by public bridge inventory

Where this state's FHWA NBI public-highway bridge count sits among every state and territory on PlainBridges

2,542 44th of 54 higher than 10 of 54 states

States and territories, banded by public bridge inventory size

Each bar is a band; taller bars hold more states. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count and share, and where it sits relative to this entry.

Source FHWA National Bridge Inventory · 2024

Read the rank neighborhood for New Hampshire

The highlighted point is New Hampshire: 2,542 bridges and 7.51% in Poor condition, rank #35 of 54 jurisdictions ordered from the lowest share upward. The five jurisdictions immediately above and below New Hampshire on that same Poor-share ordering:

  • Montana: 5,224 bridges · 6.81% Poor
  • Kentucky: 14,548 bridges · 7.37% Poor
  • New Hampshire: 2,542 bridges · 7.51% Poor
  • Oklahoma: 22,917 bridges · 7.70% Poor
  • Alaska: 1,685 bridges · 7.89% Poor

The full national sortable table lives on the rankings page.

Material families in New Hampshire

Exclusive FHWA material families across all 2,542 bridges in this state; continuous variants fold into the parent family. Orthogonal to the Poor-share scatter above.

Who maintains New Hampshire’s inventory

State agency holds 58.0% of the 2,542 public highway bridges filed under New Hampshire in the 2024 NBI, the agency-of-record split for this state, not a condition verdict.

When New Hampshire’s bridges were built

Pre-1950 construction accounts for 26.2% of the 2,542 bridges with a recorded original year in New Hampshire. Era bands are orthogonal to the Poor-share ranking above.

Condition Distribution

New Hampshire51.6%40.9%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.

MT

Montana

6.81% top marginal rate
Structure
Progressive
Burden @ $100K
$5,224

KY

Kentucky

7.37% top marginal rate
Structure
Progressive
Burden @ $100K
$14,548
Selected

NH

New Hampshire

7.51% top marginal rate
Structure
Progressive
Burden @ $100K
$2,542

OK

Oklahoma

7.70% top marginal rate
Structure
Progressive
Burden @ $100K
$22,917

AK

Alaska

7.89% top marginal rate
Structure
Progressive
Burden @ $100K
$1,685

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.

THORNTONS FERRY RD

Poor

Over: BEAVER BROOK

3.2 MI FR MERRIMACK TL, Hillsborough, NH

Built 1970 Load: 0.0 t ADT: 388

GRIST MILL HILL RD

Poor

Over: INDIAN RIVER

2.01 MI FROM GRAFTON TL, Grafton, NH

Built 1956 Load: 0.0 t ADT: 404

GRANITE ROAD

Poor

Over: SOUTH RIVER

0.3MI. RTE 153, Carroll, NH

Built 1920 Load: 0.0 t ADT: 90

OLD COUNTY RD N

Poor

Over: COLLINS BROOK

2.4 MI. DEERING TL, Hillsborough, NH

Built 1981 Load: 0.0 t ADT: 90

SOUTH ROAD

Poor

Over: MINNEWAWA BROOK

0.9 MI FR DUBLIN TL, Cheshire, NH

Built 1950 Load: 0.0 t ADT: 90

STEARNS BROOK ROAD

Poor

Over: STEARNS BROOK

0.4 MI FR SUCCESS TL, Coos, NH

Built 1950 Load: 0.0 t ADT: 90

All Bridges in New Hampshire

NH 16

Good

Over: PEABODY RIVER

3.0 MI JACKSON TL, Coos, NH

Built 1960 Load: 47.2 t ADT: 3,317

MAIN STREET

Good

Over: KINGS BROOK

1.8 MI. NEWBURY TL, Merrimack, NH

Built 2007 Load: 47.2 t ADT: 874

CROSS ROAD

Good

Over: TOWN LINE BROOK

0.8 MI FR PETERBORO TL, Hillsborough, NH

Built 2014 Load: 47.3 t ADT: 90

NH101 WB

Good

Over: LAMPREY RIVER

.1 MI RAYMOND TL, Rockingham, NH

Built 1985 Load: 47.4 t ADT: 22,064

GULF ROAD

Good

Over: STONY BROOK

0.5 MI FR GREENFIELD TL, Hillsborough, NH

Built 1920 Load: 47.4 t ADT: 90

NH 25

Good

Over: BEARCAMP RIVER

0.6 MI. TAMWORTH T.L., Carroll, NH

Built 2005 Load: 47.4 t ADT: 4,151

US 3

Good

Over: PERRY STREAM

5.0 MI EAST NH145, Coos, NH

Built 1996 Load: 47.4 t ADT: 1,847

NH 26

Good

Over: ANDROSCOGGIN RIVER

0.2 MI EAST OF RTE 16, Coos, NH

Built 1996 Load: 47.5 t ADT: 1,073

I-293 WB NH101

Good

Over: FRONTAGE RD CSX(ABD)

0.6 MI E JCT RTE 3A, Hillsborough, NH

Built 1958 Load: 47.5 t ADT: 44,045

NH101

Good

Over: MINNEWAWA BROOK

3.0MI HARRISVILLE TL., Cheshire, NH

Built 1967 Load: 47.5 t ADT: 10,893

LITTLE FALLS BR RD

Good

Over: COCHECO RIVER

0.71MI.N. NH 11, Strafford, NH

Built 1991 Load: 47.5 t ADT: 5,766

BROAD ST PARKWAY

Good

Over: NASHUA RIVER

0.4 MI N. of W. Hollis St, Hillsborough, NH

Built 2016 Load: 47.6 t ADT: 1,100

I-93 SB

Good

Over: PEMIGEWASSET RIVER

0.1 MI CAMPTON TL, Grafton, NH

Built 1969 Load: 47.6 t ADT: 7,500

I-93 NB

Good

Over: PEMIGEWASSET RIVER

0.1 MI CAMPTON TL, Grafton, NH

Built 1969 Load: 47.6 t ADT: 7,387

NH 11

Good

Over: BLACKWATER RIVER

0.7 MI FROM WILMOT T.L., Merrimack, NH

Built 1959 Load: 47.7 t ADT: 5,505

I-89 SB

Good

Over: I-89 RAMP

2.0 MI WEST CONCORD TL, Merrimack, NH

Built 1959 Load: 47.7 t ADT: 18,554

I-89 NB

Good

Over: I-89 RAMP

2.1 MI WEST OF CONCORD TL, Merrimack, NH

Built 1959 Load: 47.7 t ADT: 17,899

ISLAND POND ROAD

Good

Over: I-93 SB I-293 WB

.6 MI E JCT RTE 28A, Hillsborough, NH

Built 2009 Load: 47.7 t ADT: 3,197

ISLAND POND ROAD

Good

Over: I-93 NB I-293 EB

.6 MI E RT 28 A, Hillsborough, NH

Built 2009 Load: 47.7 t ADT: 3,197

FEE TPK

Good

Over: GREELEY STREET

AT MERRIMACK INTERCHANGE, Hillsborough, NH

Built 1993 Load: 47.7 t ADT: 76,308

BRADFORD ROAD

Good

Over: WENDELL BROOK

0.15 NEWPORT TL, Sullivan, NH

Built 2018 Load: 47.7 t ADT: 2,769

PEASLEE ROAD

Good

Over: PISCATAQUOG RIVER

0.12 MI FROM RIVER ROAD, Hillsborough, NH

Built 2015 Load: 47.7 t ADT: 50

I-93 NB OFF RAMP

Good

Over: PEMIGEWASSET R CLARKS RR

1.61 MI N WOODSTOCK TL, Grafton, NH

Built 1973 Load: 47.8 t ADT: 546

GRIMES HILL ROAD

Good

Over: INDIAN POND BROOK

1.05 MI. RTE. 10, Grafton, NH

Built 2016 Load: 47.8 t ADT: 90

SP TPK NB OFF RAMP

Good

Over: COCHECO RIVER

NB Off-ramp over Cocheco, Strafford, NH

Built 2010 Load: 47.8 t ADT: 1,205

US 4

Good

Over: MASCOMA RIVER

0.1 MI FROM ENFIELD TL, Grafton, NH

Built 1993 Load: 48.0 t ADT: 7,483

NH101 WB RAMP

Good

Over: CSX

0.2 MI E JCT NH 85, Rockingham, NH

Built 1994 Load: 48.0 t ADT: 25,063

NH 18

Good

Over: LAFAYETTE BROOK

2.7 MI FROM Sugar Hill TL, Grafton, NH

Built 1932 Load: 48.0 t ADT: 584

SECOND STREET

Good

Over: PISCATAQUOG (SOUTH BR)

0.2 MI N QUEEN CITY BRDGE, Hillsborough, NH

Built 1991 Load: 48.0 t ADT: 6,373

VILLAGE ROAD

Good

Over: ANDREW BROOK

300FT. RTE. 103, Merrimack, NH

Built 2011 Load: 48.0 t ADT: 422

NH101 WB

Good

Over: LAMPREY RIVER

4.7MI E OF CANDIA TL, Rockingham, NH

Built 1983 Load: 48.0 t ADT: 20,577

NH 25 NH118

Good

Over: HURRICANE BROOK

0.8 MI FROM WENTWORTH T.L, Grafton, NH

Built 1962 Load: 48.0 t ADT: 3,654

US 3 NH 11 NH127

Good

Over: PEMIGEWASSET RIVER

2.0 MI FROM TILTON T/L, Merrimack, NH

Built 1994 Load: 48.1 t ADT: 12,136

STINSON LAKE ROAD

Good

Over: STINSON BROOK

1.4 MI S ELLSWORTH TL, Grafton, NH

Built 1936 Load: 48.1 t ADT: 410

NH 28

Good

Over: MERRYMEETING RIVER

4.7 MI FROM BARNSTEAD TL, Belknap, NH

Built 2009 Load: 48.2 t ADT: 7,376

US 3

Good

Over: FEE TPK

0.4 MI JCT RT101, Hillsborough, NH

Built 2013 Load: 48.2 t ADT: 11,757

POTTER ROAD

Good

Over: SNOW BROOK

320FT RTE 153, Carroll, NH

Built 2022 Load: 48.2 t ADT: 90

I-93 SB

Good

Over: WALLACE HILL ROAD

3.4 MI TO RTE 141, Grafton, NH

Built 1959 Load: 48.2 t ADT: 2,362

I-93 NB

Good

Over: WALLACE HILL ROAD

3.4 MI JCT RTE 141, Grafton, NH

Built 1973 Load: 48.2 t ADT: 2,282

ROXBURY STREET

Good

Over: BEAVER BROOK

0.21MI MAIN ST, Cheshire, NH

Built 1950 Load: 48.2 t ADT: 4,512

GRANGE ROAD

Good

Over: BURNSIDE BROOK

1.87 MI SW NORTHUMBERLAND, Coos, NH

Built 1984 Load: 48.2 t ADT: 1,214

STANIELS ROAD

Good

Over: SOUCOOK RIVER

0.7 MI FR CHICHESTER TL, Merrimack, NH

Built 2001 Load: 48.2 t ADT: 90

TURKEY HILL ROAD

Good

Over: SOUHEGAN RIVER

AT NH DOT URBAN LINE, Hillsborough, NH

Built 1969 Load: 48.2 t ADT: 9,215

FEE TPK

Good

Over: SOUHEGAN RIVER

0.8 MI FROM BABOOSIC RD, Hillsborough, NH

Built 1953 Load: 48.2 t ADT: 73,393

MORSE ROAD

Good

Over: SANBORN MILL BROOK

300m south of NH 3A, Grafton, NH

Built 2004 Load: 48.2 t ADT: 90

CLEVELAND HILL RD

Good

Over: MILL BROOK

0.10 MI FR SPAULDING RD5, Carroll, NH

Built 2009 Load: 48.2 t ADT: 171

REED ROAD

Good

Over: WEST ALTON BROOK

0.9 GILFORD TL, Belknap, NH

Built 2011 Load: 48.3 t ADT: 90

NO DATA ENTERED

Good

Over: LIVERMORE TRIB 2

NO DATA ENTERED, Grafton, NH

Built 2013 Load: 48.3 t ADT: 50

FOWLER RIVER ROAD

Good

Over: BOG BROOK

0.1 MI FROM BRISTOL TL, Grafton, NH

Built 1927 Load: 48.4 t ADT: 1,113

PLUMMER ROAD

Good

Over: NH101

0.5 MI JCT RT 114, Hillsborough, NH

Built 1995 Load: 48.4 t ADT: 421

Showing 1,901-1,950 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.

What to do with this

Use New Hampshire's inventory picture to drill to a county or a specific span.

  • Browse counties in New Hampshire and open the highest-Poor shares first. County list
  • See where this state sits among peers on Poor-condition share. State rankings
  • Compare this state with another jurisdiction on the same measures. State compare

NBI condition ratings are inventory snapshots, not live crossing-safety verdicts.

Every figure on PlainBridges is rendered directly from federal source data, no number is typed in by an editor. New Hampshire Good/Fair/Poor shares and county rollups on this page are computed from the same NBI extract as the national boards; no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of 2024 NBI release. NBI condition categories reflect the latest reported inventory record, not a live safety, closure, or travel decision.