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

PERCH POND ROAD

Good

Over: BEEBE RIVER

3.1 MI FROM HOLDERNESS T, Grafton, NH

Built 1988 Load: 41.6 t ADT: 246

COOPER ROAD

Good

Over: GEORGES BROOK

0.3 MI FR NORTH SHORE RD, Grafton, NH

Built 1999 Load: 41.6 t ADT: 64

FAIR STREET

Good

Over: WINNIPESAUKEE RIVER

0.6 MI BELMONT T.L., Belknap, NH

Built 1972 Load: 41.6 t ADT: 6,253

I-293 FEE TPK

Good

Over: GRANITE STREET

0.7 MI N JCT RT 3, Hillsborough, NH

Built 2007 Load: 41.6 t ADT: 50,190

I-93 NB

Good

Over: NH 38

2.0 MI N. OF NH/MA LINE, Rockingham, NH

Built 2013 Load: 41.6 t ADT: 22,895

NH112 KANCAMAGUS

Good

Over: OLIVERIAN BROOK

1.7 MI FROM WATERVILLE, Carroll, NH

Built 1963 Load: 41.7 t ADT: 3,016

NH101 EB

Good

Over: KING STREET

3.5 MI JCT RTE 28, Rockingham, NH

Built 1961 Load: 41.7 t ADT: 27,657

GREY ROCKS ROAD

Good

Over: NHRR

0.3 MI FROM TILTON TL, Belknap, NH

Built 2000 Load: 41.7 t ADT: 480

US 4

Good

Over: BELLAMY RIVER

0.1 MI FROM JCT RTE 16, Strafford, NH

Built 1998 Load: 41.7 t ADT: 15,934

NH 9

Good

Over: BEARDS BROOK BEARDS RD

NH 9 at Beards Brook, Hillsborough, NH

Built 2002 Load: 41.7 t ADT: 6,260

NH 9

Good

Over: US202

JCT NH 9/US202, Hillsborough, NH

Built 2001 Load: 41.7 t ADT: 10,127

I-93 SB ON RAMP

Good

Over: NHRR

0.1 MI FROM NH 3A & 25, Grafton, NH

Built 1964 Load: 41.7 t ADT: 3,423

EMERSON ROAD

Good

Over: UPPER AMMONOOSUC RIVER

1.04 MI FR NORTHUMBERLAN, Coos, NH

Built 1982 Load: 41.7 t ADT: 90

PARIS ROAD

Good

Over: UPPER AMMONOOSUC RIVER

217 FT FR NH110, Coos, NH

Built 2000 Load: 41.7 t ADT: 148

NH 49

Good

Over: SMARTS BROOK

0.6 MI W OF WATERVILLE TL, Grafton, NH

Built 1977 Load: 41.7 t ADT: 2,786

KNOWLES HILL ROAD

Good

Over: BROCK BROOK

3.8 MI FROM SHIN VALLEY, Grafton, NH

Built 1935 Load: 41.8 t ADT: 90

NH123

Good

Over: WARREN BROOK

1.0 MI SE JCT NH 123A, Cheshire, NH

Built 2008 Load: 41.8 t ADT: 1,253

WIECZOREK DR

Good

Over: MERRIMACK R NH 3A CSX

1 MILE WEST OF MHT, Hillsborough, NH

Built 2011 Load: 41.8 t ADT: 49,662

BUNKER HILL ROAD

Good

Over: NEEDLE SHOP BROOK

2.1 MI FR, Merrimack, NH

Built 1960 Load: 41.8 t ADT: 110

I-293 FEE TPK RAMP

Good

Over: S BR PISCATAQUOG RIVER

0.7 MI BEDFORD T.L., Hillsborough, NH

Built 1957 Load: 41.8 t ADT: 4,781

NH125

Good

Over: NHNCRR

1.9 MI FROM ROCHESTER TL, Strafford, NH

Built 1954 Load: 41.8 t ADT: 7,310

NH 10

Good

Over: BEAN BROOK

0.5 MI FROM ORFORD TL, Grafton, NH

Built 2000 Load: 41.8 t ADT: 1,223

KINGSTON ROAD

Good

Over: CSX

1.1 MI S KINGSTON TL, Rockingham, NH

Built 2004 Load: 41.8 t ADT: 4,814

LOVERS LANE

Good

Over: NECRR

.34 MI JCT N.H.12, Sullivan, NH

Built 1996 Load: 42.0 t ADT: 4,540

MARTIN ROAD

Good

Over: NH101

1.1 MI WEST JCT NH101/125, Rockingham, NH

Built 1995 Load: 42.0 t ADT: 504

CENTER HILL ROAD

Good

Over: BLAKES BROOK

0.3MI NH9, Merrimack, NH

Built 2008 Load: 42.0 t ADT: 833

I-93 SB

Good

Over: PELHAM ROAD

1.1 M N OF JCT RT 38, Rockingham, NH

Built 2014 Load: 42.0 t ADT: 46,190

I-93 NB

Good

Over: PELHAM ROAD

1.1 M N OF JCT 38, Rockingham, NH

Built 2014 Load: 42.0 t ADT: 44,637

NH113

Good

Over: MILL BROOK

0.5 MI FROM NH 25, Carroll, NH

Built 1987 Load: 42.0 t ADT: 2,216

SOUTH SLACK RD

Good

Over: LITTLE SUGAR RIVER

1.4 MI FROM ACWORTH TL, Sullivan, NH

Built 1991 Load: 42.0 t ADT: 90

WEST MEADOW ROAD

Good

Over: HOYT BROOK

2.7 MI FROM WASHINGTON T, Merrimack, NH

Built 2009 Load: 42.1 t ADT: 90

NH 9(LOUDON RD)

Good

Over: STORRS STREET CSX

.1 MI WEST OF JCT I-93, Merrimack, NH

Built 1970 Load: 42.1 t ADT: 19,197

I-93 FEE TPK

Good

Over: US 3 MANCHESTER STREET

1.2 MI NO OF JCT RT 3-A, Merrimack, NH

Built 2000 Load: 42.1 t ADT: 73,528

TOWLE FARM ROAD

Good

Over: TAYLOR RIVER

AT HAMPTON FALLS TL, Rockingham, NH

Built 1977 Load: 42.1 t ADT: 2,192

FITCH ROAD

Good

Over: CONTOOCOOK RIVER

200 FT FR US202, Cheshire, NH

Built 1970 Load: 42.1 t ADT: 321

US 3 NH 11

Good

Over: NH107

1.5 MI FROM BELMONT T.L., Belknap, NH

Built 1963 Load: 42.1 t ADT: 8,703

NH108

Good

Over: SQUAMSCOTT RIVER

NEWFIELDS-STRATHAM TL, Rockingham, NH

Built 2001 Load: 42.1 t ADT: 13,535

NH113

Good

Over: BEARCAMP RIVER

2.6 MI FROM RTE 109, Carroll, NH

Built 1927 Load: 42.1 t ADT: 705

POTTER ROAD

Good

Over: CONWAY LAKE INLET

1.2 MI. RTE 153, Carroll, NH

Built 2009 Load: 42.2 t ADT: 90

MAIN STREET

Good

Over: BAKER RIVER

0.4 MI N JCT RTE 25, Grafton, NH

Built 1998 Load: 42.2 t ADT: 1,603

US 3

Good

Over: BISHOP BROOK

0.1 MI CLARKSVILLE TL, Coos, NH

Built 1924 Load: 42.2 t ADT: 1,802

BIRCHDALE ROAD

Good

Over: BELA BROOK

0.23 MI SE JCT NH 13, Merrimack, NH

Built 2021 Load: 42.3 t ADT: 459

NH106

Good

Over: SOUCOOK RIVER

PEMBROKE TL, Merrimack, NH

Built 1996 Load: 42.3 t ADT: 9,421

NH 16

Good

Over: CLEAR STREAM

0.1 MI SW OF RTE 26, Coos, NH

Built 1997 Load: 42.3 t ADT: 842

US202 NH 16 SP TPK

Good

Over: TEN ROD ROAD

.4MI FROM JCT RT 11, Strafford, NH

Built 2012 Load: 42.3 t ADT: 20,334

NH111

Good

Over: WETLAND 41

WINDHAM, Rockingham, NH

Built 2007 Load: 42.3 t ADT: 18,189

NH122 MAIN ST

Good

Over: NH101

2.8 MI MILFORD TL, Hillsborough, NH

Built 1969 Load: 42.4 t ADT: 6,927

BURTON HIGHWAY

Good

Over: MILL BROOK

TOWN RD, Hillsborough, NH

Built 2002 Load: 42.4 t ADT: 242

I-89 SB OFF RAMP

Good

Over: PLAZA CONNECTOR ROAD

SB OFF RAMP AT EXIT 20, Grafton, NH

Built 2012 Load: 42.5 t ADT: 8,782

SEARLES ROAD

Good

Over: SALMON BROOK

.2 MI W OF E DUNSTABLE RD, Hillsborough, NH

Built 1999 Load: 42.5 t ADT: 2,219

Showing 1,601-1,650 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.