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

POLLARDS MILLS RD

Good

Over: SO BR SUGAR RIVER

0.8 MI RTE 10, Sullivan, NH

Built 2003 Load: 44.2 t ADT: 662

NH 28 BYPASS

Good

Over: LAKE MASSABESIC

2.0 MI JCT RT 121, Rockingham, NH

Built 2001 Load: 44.3 t ADT: 7,016

NH 25

Good

Over: OLIVERIAN BROOK

3.6 MI FROM BENTON TL, Grafton, NH

Built 1999 Load: 44.3 t ADT: 977

NH101

Good

Over: PONEMAH HILL ROAD

0.8 M W AMHERST T.L., Hillsborough, NH

Built 1971 Load: 44.3 t ADT: 23,734

VALLEY ROAD

Good

Over: ISRAEL RIVER

0.66 MI WEST OF JCT US 2, Coos, NH

Built 1986 Load: 44.3 t ADT: 142

OLD TOWN ROAD

Good

Over: AMMONOOSUC RIVER

1.6 MI FROM BETHLEHEM TL, Coos, NH

Built 1915 Load: 44.4 t ADT: 90

TALLANT ROAD

Good

Over: BEAVER BROOK

261 FT. RTE. 111, Hillsborough, NH

Built 2006 Load: 44.4 t ADT: 2,457

NORTH ASHLAND ROAD

Good

Over: I-93

.3MI FROM HOLDERNESS, Grafton, NH

Built 1963 Load: 44.5 t ADT: 778

I-93 SB

Good

Over: COLLINS ST SQUAM RIVER

.08 MI NEW HAMPTON T.L., Grafton, NH

Built 1963 Load: 44.5 t ADT: 10,717

I-93 NB

Good

Over: COLLINS ST SQUAM RIVER

.07 MI NEW HAMPTON T.L., Grafton, NH

Built 1963 Load: 44.5 t ADT: 10,714

NH 28 BYPASS

Good

Over: BEAVER BROOK

4.0 MI S AUBURN TL, Rockingham, NH

Built 1996 Load: 44.5 t ADT: 12,422

NH108

Good

Over: BELLAMY RIVER

1.6 MI FROM MADBURY TL, Strafford, NH

Built 1986 Load: 44.5 t ADT: 15,932

ROBERTS ROAD

Good

Over: SNOW BROOK

TOWN RD, Carroll, NH

Built 2016 Load: 44.5 t ADT: 90

NH101E WINNACUNNET

Good

Over: EEL CREEK

.2 MI WEST JCT NH 1A, Rockingham, NH

Built 1997 Load: 44.5 t ADT: 3,814

GROTON ROAD

Good

Over: TANNERY BROOK

2.7 MI FROM BRISTOL TL, Grafton, NH

Built 1984 Load: 44.5 t ADT: 822

I-93 SB

Good

Over: HANSON BROOK

3.4 MI NO WOODSTOCK TL, Grafton, NH

Built 1984 Load: 44.5 t ADT: 5,020

FEE TPK SB ON RAMP

Good

Over: FEE TPK SB OFF RAMP

1 MI N MASS SL, Hillsborough, NH

Built 1995 Load: 44.5 t ADT: 8,802

NH 11 NH103

Good

Over: SUGAR RIVER

5.2 MI FROM CLAREMONT TL, Sullivan, NH

Built 1985 Load: 44.5 t ADT: 15,541

US 2

Good

Over: MOOSE RIVER

5.8 MI FROM JEFFERSON TL, Coos, NH

Built 1966 Load: 44.5 t ADT: 5,144

US202 NH 11

Good

Over: NH125

NH 16 INTERCHANGE, Strafford, NH

Built 1957 Load: 44.5 t ADT: 16,131

US202 NH 11 SP TPK

Good

Over: RECREATION TRAIL

2.8 MI S OF MILTON TL, Strafford, NH

Built 1978 Load: 44.5 t ADT: 15,051

MEADOW ROAD

Good

Over: ANDROSCOGGIN RIVER

0.43 MI NE JCT US 2, Coos, NH

Built 1984 Load: 44.5 t ADT: 155

NH120

Good

Over: REDWATER BROOK

0.04 MI FROM CLAREMONT TL, Sullivan, NH

Built 1956 Load: 44.7 t ADT: 2,266

TOLEND ROAD

Good

Over: NH 16 SP TPK

1.4 MI FROM JCT. 16, Strafford, NH

Built 1957 Load: 44.7 t ADT: 4,020

NH125

Good

Over: LAMPREY RIVER

0.7 MI FROM JCT RTE 101, Rockingham, NH

Built 1991 Load: 44.7 t ADT: 17,277

LONG ISLAND ROAD

Good

Over: LAKE WINNIPESAUKEE

4.1 MI FROM HANSON RD, Carroll, NH

Built 1988 Load: 44.7 t ADT: 1,219

COON BROOK ROAD

Good

Over: SO BR SUGAR RIVER

390 FT FROM NH 10, Sullivan, NH

Built 1960 Load: 44.7 t ADT: 90

US 4 NH 16 SP TPK

Good

Over: GOSLING ROAD

1.2 MI N JCT I-95, Rockingham, NH

Built 1993 Load: 44.7 t ADT: 58,550

INNOVATION DRIVE

Good

Over: NHNCRR

0.3 MILES FROM JCT NH108, Strafford, NH

Built 2013 Load: 44.7 t ADT: 187

WOODLAND LANE

Good

Over: WHITNEY BROOK

175 FT. FROM VILLAGE ROA, Merrimack, NH

Built 1988 Load: 44.7 t ADT: 90

FDR 13

Good

Over: COLD BROOK

MAP 02, Coos, NH

Built 2006 Load: 44.7 t ADT: 99

NH118

Good

Over: INDIAN RIVER

1.3 MI FROM DORCHESTER TL, Grafton, NH

Built 1950 Load: 44.9 t ADT: 1,408

NH 12A

Good

Over: OX BROOK

1.0 MI NW JCT 12 AND 12A, Sullivan, NH

Built 2002 Load: 44.9 t ADT: 1,438

SIXTH STREET

Good

Over: NH 16 SP TPK

1.2 MI. FROM JCT. 16, Strafford, NH

Built 1957 Load: 44.9 t ADT: 5,320

US302

Good

Over: AVALANCHE BROOK

3.5 MI CARROLL TL, Carroll, NH

Built 1960 Load: 44.9 t ADT: 2,100

US 2

Good

Over: CONNECTICUT RIVER

AT VERMONT STATE LINE, Coos, NH

Built 2020 Load: 44.9 t ADT: 3,802

I-89 SB

Good

Over: PLAZA CONNECTOR ROAD

0.4 MI EAST OF VT/NH LINE, Grafton, NH

Built 2012 Load: 44.9 t ADT: 18,253

I-89 SB

Good

Over: NH 12A

0.5 MI FROM VT S.L., Grafton, NH

Built 2012 Load: 44.9 t ADT: 18,253

I-93(RAMP 3N-F)

Good

Over: US 3

3.7 MI FROM WOODSTOCK TL, Grafton, NH

Built 1986 Load: 44.9 t ADT: 396

COVERED BRIDGE RD

Good

Over: MILL BROOK

OFF MILL BROOK ROAD, Grafton, NH

Built 2018 Load: 44.9 t ADT: 90

I-93 SB

Good

Over: NH111A

.7/10 OF MIL WEST NH 111, Rockingham, NH

Built 2014 Load: 44.9 t ADT: 46,190

NH 26

Good

Over: RECREATION TRAIL

.3 M E OF COLEBROOK T/L, Coos, NH

Built 2017 Load: 45.0 t ADT: 917

NH 85

Good

Over: NH101

1.5 MI NEWFIELDS TL, Rockingham, NH

Built 1994 Load: 45.1 t ADT: 6,791

NH128

Good

Over: BEAVER BROOK

WINDHAM T.L., Rockingham, NH

Built 1934 Load: 45.1 t ADT: 8,944

NH 11

Good

Over: US202 NH 16 SP TPK

.8 MI FROM JCT NH202-A, Strafford, NH

Built 2011 Load: 45.1 t ADT: 18,815

LAFAYETTE CAMP ENT

Good

Over: PEMIGEWASSET RIVER

0.15 MIFR FRANCONIA TL, Grafton, NH

Built 1999 Load: 45.2 t ADT: 100

NH 31

Good

Over: SOUHEGAN RIVER

0.1 MI. FROM JCT. NH 101, Hillsborough, NH

Built 1971 Load: 45.2 t ADT: 1,896

WHITAKER LANE

Good

Over: KEARSARGE BROOK

.06 MI FR BARTLET RD, Carroll, NH

Built 2000 Load: 45.3 t ADT: 90

US 4

Good

Over: NHRR(ABD)

3.7 MI FROM WILMOT TL, Merrimack, NH

Built 2023 Load: 45.3 t ADT: 2,454

NH153

Good

Over: COCHECO RIVER

.8 MI FROM JCT. NH 11, Strafford, NH

Built 2018 Load: 45.3 t ADT: 1,214

Showing 1,751-1,800 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.