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

US302

Fair

Over: CONNECTICUT RIVER

VERMONT STATE LINE, Grafton, NH

Built 1928 Load: 32.7 t ADT: 7,331

DEPOT ROAD

Fair

Over: ASHUELOT RIVER

0.1 MI. S OF RT. 119 JCT., Cheshire, NH

Built 1978 Load: 32.7 t ADT: 312

PINE STREET

Fair

Over: I-93 FEE TPK

.5 MI SO. BOW TL, Merrimack, NH

Built 1978 Load: 32.7 t ADT: 2,212

NH111 WB

Fair

Over: MERRIMACK RIVER

.1 MI WEST OF JCT RT 3A, Hillsborough, NH

Built 1970 Load: 32.7 t ADT: 16,887

NH111 EB

Fair

Over: MERRIMACK RIVER

.1 MI WEST OF JCT RT 3-A, Hillsborough, NH

Built 1973 Load: 32.7 t ADT: 15,264

US 2

Fair

Over: ISRAEL RIVER

0.4 MI E LANCASTER TL, Coos, NH

Built 1974 Load: 32.7 t ADT: 2,443

US302 NH 10

Fair

Over: MILL BROOK

0.1 MI EAST OF BATH TL, Grafton, NH

Built 1930 Load: 32.7 t ADT: 3,021

CRANE BROOK ROAD

Fair

Over: COLD RIVER

0.5MI WEST OF ACWORTH TL, Sullivan, NH

Built 1964 Load: 32.7 t ADT: 364

LEE HOOK ROAD

Fair

Over: LAMPREY RIVER

.6 MI SE JCT 155, Strafford, NH

Built 1923 Load: 32.7 t ADT: 1,593

US302 NH 10

Fair

Over: NHRR(ABD)

2.9 MI LANDAFF TL, Grafton, NH

Built 1979 Load: 32.7 t ADT: 5,186

ASH HILL ROAD

Fair

Over: PETTYBORO BROOK

1.9 MI FR LISBON TL, Grafton, NH

Built 1984 Load: 32.7 t ADT: 90

RIVER ROAD

Fair

Over: GRANT BROOK

2.6 MI FR HANOVER TL, Grafton, NH

Built 1978 Load: 32.7 t ADT: 340

I-93 NB

Fair

Over: MERRIMACK RIVER CSX RD

AT MANCHESTER-HOOKSETT TL, Hillsborough, NH

Built 1976 Load: 32.7 t ADT: 47,411

I-93 SB

Fair

Over: MERRIMACK RIVER CSX RD

MANCHESTER-HOOKSETT TL, Hillsborough, NH

Built 1976 Load: 32.7 t ADT: 33,486

NH 16 SP TPK

Fair

Over: NH125

7.8 MI N OF ROCHESTER TL, Strafford, NH

Built 1981 Load: 32.7 t ADT: 14,784

TINKER ROAD

Fair

Over: FEE TPK

0.9 MI S MERRIMACK T/L, Hillsborough, NH

Built 1987 Load: 32.7 t ADT: 3,531

WATER STREET

Fair

Over: FACTORY ACCESS ROAD

0.13 MI FR MAIN ST, Hillsborough, NH

Built 1962 Load: 32.7 t ADT: 4,949

NH108

Fair

Over: CSX

NEWMARKET TL, Rockingham, NH

Built 1936 Load: 32.7 t ADT: 16,190

NH108

Fair

Over: CSX

NEWFIELDS T.L., Rockingham, NH

Built 1936 Load: 32.7 t ADT: 16,190

NH108

Fair

Over: LAMPREY RIVER

.4 MI FROM JCT. RT. 152, Rockingham, NH

Built 1955 Load: 32.7 t ADT: 10,461

OAK STREET

Fair

Over: SUGAR RIVER

0.5 MI FR NO. NEWPORT RD, Sullivan, NH

Built 1979 Load: 32.7 t ADT: 947

BELKNAP AVENUE

Fair

Over: SUGAR RIVER

0.2 MI FR NO. MAIN ST, Sullivan, NH

Built 1974 Load: 32.7 t ADT: 1,321

US 3

Fair

Over: SL&ARR

2.2 MI FROM STRATFORD TL, Coos, NH

Built 1959 Load: 32.7 t ADT: 2,993

EASTMAN ROAD

Fair

Over: ORANGE BROOK

0.08 MI FR CANAAN TL, Grafton, NH

Built 1976 Load: 32.7 t ADT: 55

TOWN ROAD #79

Fair

Over: JACOBS BROOK

125 FT. RTE. 25A, Grafton, NH

Built 1930 Load: 32.7 t ADT: 52

NH 25A

Fair

Over: JACOBS BROOK

4.1 MI FROM VERMONT SL, Grafton, NH

Built 1925 Load: 32.7 t ADT: 1,269

NH 16

Fair

Over: NH 25

6.0 MI TAMWORTH T.L., Carroll, NH

Built 1969 Load: 32.7 t ADT: 7,962

NH 1B

Fair

Over: PISCATAQUA ESTUARY

1.3 MI FROM JCT RT 1, Rockingham, NH

Built 1955 Load: 32.7 t ADT: 2,973

NH 28 (S BROADWAY)

Fair

Over: SPICKET RIVER

1.1MI N. OF MASS SL, Rockingham, NH

Built 1900 Load: 32.7 t ADT: 19,774

I-93 SB

Fair

Over: OLD NH 3B

TILTON-SANBORTON TL, Belknap, NH

Built 1962 Load: 32.7 t ADT: 14,004

I-93 NB

Fair

Over: OLD NH 3B

.09 MI TILTON T.L., Belknap, NH

Built 1962 Load: 32.7 t ADT: 13,995

NH286

Fair

Over: CSX(ABD)

AT MASS S.L., Rockingham, NH

Built 1940 Load: 32.7 t ADT: 6,933

NORTH ROAD

Fair

Over: MILL BROOK

3.2 MI JCT US 2, Coos, NH

Built 1962 Load: 32.7 t ADT: 90

SALMON FALLS ROAD

Fair

Over: SALMON FALLS RIVER

MAINE STATE LINE RD 5, Strafford, NH

Built 1969 Load: 32.7 t ADT: 4,946

NH 11 RAMP

Fair

Over: SUGAR RIVER

0.1 MI FROM NEWPORT TL, Sullivan, NH

Built 1923 Load: 32.7 t ADT: 1,463

JOSLIN ROAD

Fair

Over: MERRIAM BROOK

TOWN RD, Cheshire, NH

Built 2012 Load: 32.7 t ADT: 90

MAIN STREET

Fair

Over: SWIFT RIVER

0.09 MI FROM NH RTE 113, Carroll, NH

Built 1973 Load: 32.7 t ADT: 800

NH 12

Fair

Over: S BRANCH ASHUELOT RIVER

2.2MI TO TROY CENTER, Cheshire, NH

Built 1983 Load: 32.7 t ADT: 8,843

NORTH VILLAGE ROAD

Fair

Over: WARNER RIVER

0.05 MI FROM I-89, Merrimack, NH

Built 1967 Load: 32.7 t ADT: 783

STUDIO ROAD

Fair

Over: BAKER RIVER

0.10MI NH25, Grafton, NH

Built 1976 Load: 32.7 t ADT: 123

RIVER ROAD

Fair

Over: PISCATAQUOG RIVER

1.8 MI N JCT RT 114, Hillsborough, NH

Built 1964 Load: 32.7 t ADT: 1,214

CLOUGH PARK ROAD

Fair

Over: PISCATAQUOG RIVER

1.0 MI S DUNBARTON TL, Hillsborough, NH

Built 1962 Load: 32.7 t ADT: 533

MAKINEN ROAD

Fair

Over: MILL BROOK

0.09MI NH 12, Cheshire, NH

Built 2015 Load: 32.7 t ADT: 90

NH125

Fair

Over: COCHECO RIVER

.7 MI JCT RT 16, Strafford, NH

Built 1931 Load: 33.0 t ADT: 16,118

I-93 SB

Fair

Over: TRIPOLI ROAD

3.46 MI LINCOLN TL, Grafton, NH

Built 1972 Load: 33.0 t ADT: 7,060

I-93 NB

Fair

Over: TRIPOLI ROAD

3.46 MI LINCOLN TL, Grafton, NH

Built 1972 Load: 33.0 t ADT: 6,913

NH 16

Fair

Over: NEW RIVER

.3 MI. N. OF JACKSON TL, Coos, NH

Built 1955 Load: 33.1 t ADT: 3,513

DENMAN THOMPSON HW

Fair

Over: ASHUELOT RIVER

0.19 MI FR WINCHESTER ST, Cheshire, NH

Built 1976 Load: 33.1 t ADT: 1,445

ELM STREET

Fair

Over: ASHUELOT RIVER

ADJACENT NH 119, Cheshire, NH

Built 1921 Load: 33.1 t ADT: 2,163

NH 11

Fair

Over: ELBOW BROOK

5.8 MI FROM FRANKLIN TL, Merrimack, NH

Built 1934 Load: 33.3 t ADT: 2,886

Showing 601-650 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.