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

US 4

Good

Over: TEWKSBURY POND OUTLET

2.0 MI SE ORANGE TL, Grafton, NH

Built 1928 Load: 58.4 t ADT: 1,822

NUTE ROAD

Good

Over: BELLAMY RIVER

0.4 BARRINGTON TL, Strafford, NH

Built 2022 Load: 58.4 t ADT: 165

NH 13

Good

Over: WEST BRANCH BELA BROOK

0.1 MI FROM DUNBARTON TL, Merrimack, NH

Built 1940 Load: 58.6 t ADT: 7,247

DAVIS ROAD

Good

Over: SMITH RIVER

95FT. RTE 4, Grafton, NH

Built 2011 Load: 58.8 t ADT: 328

I-93 SB OFF RAMP

Good

Over: RECREATION TRAIL

1.5MI S MANCHESTER T/L, Rockingham, NH

Built 2009 Load: 58.8 t ADT: 7,939

OLD CHESHIRE CO RD

Good

Over: SPRING BROOK

0.1 MI E UNITY SPRINGS RD, Sullivan, NH

Built 2013 Load: 58.8 t ADT: 90

NH112 LOST RIV RD

Good

Over: WILD AMMONOOSUC RIVER

2.05 MI SE EASTON TL, Grafton, NH

Built 1995 Load: 58.8 t ADT: 1,652

ARCHERTOWN ROAD

Good

Over: ARCHERTOWN BROOK

0.7 MI FR HIGH BRIDGE RD, Grafton, NH

Built 2014 Load: 59.0 t ADT: 232

US 3

Good

Over: PERRY STREAM OVERFLOW

5.0 MI EAST NH145, Coos, NH

Built 1996 Load: 59.0 t ADT: 1,847

TINKER ROAD

Good

Over: PENNICHUCK RESERVOIR

AT NASHUA TL, Hillsborough, NH

Built 1999 Load: 59.1 t ADT: 3,531

NH109

Good

Over: SMITH RIVER

3.5 MI SE TUFTONBORO TL, Carroll, NH

Built 1900 Load: 59.1 t ADT: 7,249

CHUBBUCK ROAD

Good

Over: RIDDLE BROOK

.5 MI WEST OF WALLACE RD, Hillsborough, NH

Built 2013 Load: 59.3 t ADT: 538

MAGAZINE STREET

Good

Over: RIDDLE BROOK

0.4 MI SOUTH WALLACE RD, Hillsborough, NH

Built 2013 Load: 59.3 t ADT: 538

I-93 SB

Good

Over: KENDALL POND ROAD

.2 MI S. LONDONDERRY TL, Rockingham, NH

Built 1962 Load: 59.3 t ADT: 40,312

WILLOW STREET

Good

Over: BEAVER BROOK

0.27 MI. RTE. 30, Hillsborough, NH

Built 2019 Load: 59.5 t ADT: 5,349

US 3

Good

Over: NHRR

2.02 MI S. MEREDITH T/L, Belknap, NH

Built 1933 Load: 59.6 t ADT: 13,478

NH101

Good

Over: MINNEWAWA BROOK

2.8 MI FM HARRISVILLE TL, Cheshire, NH

Built 1986 Load: 59.6 t ADT: 7,893

NO DATA ENTERED

Good

Over: LIVERMORE TRIB 1

NO DATA ENTERED, Grafton, NH

Built 2013 Load: 59.6 t ADT: 50

MILL STREET

Good

Over: CONWAY LAKE OUTLET

0.8 MI FR US RTE 302, Carroll, NH

Built 1940 Load: 59.8 t ADT: 1,613

I-93 NB

Good

Over: KENDALL POND ROAD

.2 MI S OF LONDONDERRY TL, Rockingham, NH

Built 1962 Load: 59.9 t ADT: 40,201

HIGHLAND STREET

Good

Over: JEWETT BROOK

.08MiFrRte 11A-GilfordAve, Belknap, NH

Built 1989 Load: 59.9 t ADT: 2,659

NH113A

Good

Over: SWIFT RIVER

4.5 MI FROM SANDWICH TL, Carroll, NH

Built 1956 Load: 60.0 t ADT: 351

RIVERDALE ROAD

Good

Over: MID BR PISCATAQUOG RIVER

65 FT FR GREGG MILL ROAD, Hillsborough, NH

Built 2015 Load: 60.1 t ADT: 199

RANDALL ROAD

Good

Over: BRYANT BROOK

0.02 MI FROM WEST RD, Merrimack, NH

Built 1930 Load: 60.2 t ADT: 90

NH 26

Good

Over: CLEAR STREAM

0.05 MI FROM ERROL TL, Coos, NH

Built 1926 Load: 60.2 t ADT: 971

NH101

Good

Over: HOWE RESERVOIR

1.9MI E MARLBORO T.L., Cheshire, NH

Built 1980 Load: 60.4 t ADT: 6,087

I-293 FEE TPK SB

Good

Over: NH 3A

2.MI S HOOKSETT T.L., Hillsborough, NH

Built 1956 Load: 60.4 t ADT: 19,972

I-393 US 4 US202W

Good

Over: HORSE CORNER ROAD

0.01 MI W NH 9, Merrimack, NH

Built 1988 Load: 60.4 t ADT: 7,980

CAMP GROUND ROAD

Good

Over: PLEASANT STREAM

1.01MI NH 4A, Merrimack, NH

Built 2004 Load: 60.4 t ADT: 368

NH101

Good

Over: PULPIT BROOK

.1 MILE FROM AMHERST TL, Hillsborough, NH

Built 2023 Load: 60.5 t ADT: 17,501

NH116

Good

Over: REEL BROOK

3.4 MI S FRANCONIA T.L., Grafton, NH

Built 1928 Load: 60.6 t ADT: 404

NH149

Good

Over: PISCATAQUOG RIVER

0.21 MI. SW WEARE TL, Hillsborough, NH

Built 1939 Load: 60.8 t ADT: 1,449

I-93 NB

Good

Over: EUSTIS HILL ROAD

0.6 MI BETHLEHEM TL, Grafton, NH

Built 1959 Load: 60.8 t ADT: 4,172

I-393 US 4 US202E

Good

Over: HORSE CORNER ROAD

0.01 MI W NH 9, Merrimack, NH

Built 1988 Load: 60.8 t ADT: 8,399

US 3

Good

Over: BEAVER BROOK

3.9 MI S STEWARTSTOWN TL, Coos, NH

Built 1929 Load: 60.9 t ADT: 2,906

US 4 US202 NH 9

Good

Over: SUNCOOK RIVER OVERFLOW

.4 MI EAST JCT. RT 28, Merrimack, NH

Built 1996 Load: 60.9 t ADT: 16,677

I-89 SB

Good

Over: NH 13

1.4 MI NW OF BOW TL, Merrimack, NH

Built 1959 Load: 61.2 t ADT: 21,925

I-93 SB

Good

Over: EUSTIS HILL ROAD

0.6 MI BETHLEHEM TL, Grafton, NH

Built 1959 Load: 61.2 t ADT: 4,433

NH 3A

Good

Over: I-93 FEE TPK

0.3 MI N OF BOW TL, Merrimack, NH

Built 2015 Load: 61.4 t ADT: 13,445

NH107

Good

Over: EXETER RIVER

FREMONT-BRENTWOOD TL, Rockingham, NH

Built 1988 Load: 61.6 t ADT: 4,966

SEWALLS FALLS ROAD

Good

Over: MERRIMACK RIVER

0.3 MI JCT RTE 132, Merrimack, NH

Built 2016 Load: 61.9 t ADT: 3,625

BELKNAP MT ROAD

Good

Over: GUNSTOCK RIVER

100 SOUTH NH 11-A, Belknap, NH

Built 1900 Load: 61.9 t ADT: 989

HANCOCK ROAD

Good

Over: SKATUTAKEE LAKE

TOWN RD, Cheshire, NH

Built 1960 Load: 62.1 t ADT: 600

PROVINCE ROAD

Good

Over: SUNCOOK RIVER

210 FT FR NH RTE 28, Belknap, NH

Built 1998 Load: 62.6 t ADT: 90

CASCADE STREET

Good

Over: SL&ARR

AT BERLIN GORHAM TL, Coos, NH

Built 1999 Load: 62.6 t ADT: 480

NH 10

Good

Over: S BRANCH SUGAR RIVER

0.6 MI FROM LEMPSTER TL, Sullivan, NH

Built 1928 Load: 62.6 t ADT: 1,887

US 4 WB

Good

Over: SP TPK NH 16

0.4 MI JCT US 4, Strafford, NH

Built 2020 Load: 62.7 t ADT: 14,038

WATER STREET

Good

Over: JOHNS RIVER

0.05 MI FROM BROWN ST, Coos, NH

Built 1932 Load: 62.9 t ADT: 116

I-93 SB

Good

Over: WEST ROAD

3.1 MI NO. CONCORD T.L., Merrimack, NH

Built 1960 Load: 63.0 t ADT: 18,528

I-93 NB

Good

Over: WEST ROAD

3.1 MI NO. CONCORD T.L., Merrimack, NH

Built 1960 Load: 63.0 t ADT: 18,873

Showing 2,201-2,250 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.