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: NHRR

4.2 MI.BARTLETT T.L., Carroll, NH

Built 1978 Load: 30.7 t ADT: 2,768

I-89 SB

Fair

Over: NH103

6.3 MI HOPKINTON TL, Merrimack, NH

Built 1968 Load: 30.7 t ADT: 10,636

I-89 SB

Fair

Over: NORTH VILLAGE ROAD

5.2 MI HOPKINTON T.L., Merrimack, NH

Built 1966 Load: 30.7 t ADT: 10,636

I-93 NB

Fair

Over: NH 18 NH116

0.7 M N SUGARHILL TL, Grafton, NH

Built 1972 Load: 30.8 t ADT: 2,848

OLD NH 10

Fair

Over: SKINNER BROOK

3.11 MI. N. OF CROYDON TL, Sullivan, NH

Built 1930 Load: 30.8 t ADT: 90

I-93 NB

Fair

Over: BRIDGE STREET

1.2 MI W JCT NH 28 BYP, Hillsborough, NH

Built 1977 Load: 30.8 t ADT: 24,518

NH 12

Fair

Over: S BR ASHUELOT RIVER

0.7MI SWANZEY T.L., Cheshire, NH

Built 1962 Load: 30.8 t ADT: 8,843

I-89 SB

Fair

Over: OTTERVILLE ROAD

4.4 MI FROM SUTTON TL, Merrimack, NH

Built 1967 Load: 30.8 t ADT: 9,263

I-89 SB

Fair

Over: NH 11

3.9 MI FROM SUTTON T.L., Merrimack, NH

Built 1967 Load: 30.8 t ADT: 9,665

I-89 NB

Fair

Over: NH 11

4.0 MI FROM SUTTON TL, Merrimack, NH

Built 1967 Load: 30.8 t ADT: 9,607

I-89 NB

Fair

Over: COLUMBUS AVENUE

2.9 MI FROM SUTTON T.L., Merrimack, NH

Built 1967 Load: 30.8 t ADT: 9,607

SANDWICH NOTCH RD

Fair

Over: ALGONQUIN BROOK

1.9 MI FR THORNTON TL, Carroll, NH

Built 1983 Load: 30.8 t ADT: 90

BUCK RD OLD NH120

Fair

Over: MINK BROOK

BUCK RD @ MINK BROOK, Grafton, NH

Built 1936 Load: 30.9 t

US302

Fair

Over: AMMONOOSUC RIVER

3.5 MI. EAST INT US3, Coos, NH

Built 1974 Load: 31.0 t ADT: 4,613

NH 26

Fair

Over: MOHAWK RIVER

0.2 MI FROM JCT US 3, Coos, NH

Built 1973 Load: 31.0 t ADT: 2,779

RUSH ROAD

Fair

Over: AMEY BROOK

0.14 MI N JCT 202, Merrimack, NH

Built 1935 Load: 31.0 t ADT: 937

I-89 NH 10 SB RAMP

Fair

Over: MASCOMA RIVER ROAD-GATED

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

Built 1966 Load: 31.0 t ADT: 4,564

I-93 SB

Fair

Over: AMMONOOSUC RIVER

2.1 MI BETHLEHEM TL, Grafton, NH

Built 1960 Load: 31.0 t ADT: 4,433

I-93 NB

Fair

Over: WELLINGTON ROAD

0.2 MI E JCT RTE 28, Hillsborough, NH

Built 1976 Load: 31.0 t ADT: 41,147

I-93 NB

Fair

Over: NH101 WB SBE RAMP

0.05 MI N JCT BRIDGE ST, Hillsborough, NH

Built 1977 Load: 31.0 t ADT: 24,518

NH114

Fair

Over: PISCATAQUOG RIVER

GOFFSTOWN TL, Hillsborough, NH

Built 1972 Load: 31.0 t ADT: 9,162

NH 10

Fair

Over: MIREY BROOK

0.2 MI FROM JCT RTE 78, Cheshire, NH

Built 1940 Load: 31.0 t ADT: 8,782

I-89 SB

Fair

Over: TRUCK ROAD MASCOMA RIVER

5.9 MI ENFIELD TL, Grafton, NH

Built 1966 Load: 31.2 t ADT: 19,605

GRANITE STREET

Fair

Over: RECREATION TRAIL

0.42MI RTE 3, Hillsborough, NH

Built 1900 Load: 31.2 t ADT: 618

I-93 NB OFF RAMP

Fair

Over: I-293 EB NH101 EB

.1 MI E JCT RTE .3, Hillsborough, NH

Built 1961 Load: 31.2 t ADT: 14,863

NH111

Fair

Over: I-95

1.2 MI JCT RTE 1, Rockingham, NH

Built 1975 Load: 31.2 t ADT: 8,155

I-95 NB

Fair

Over: US 4 NH 16 SP TPK

I-95 SP TPK INTERCHANGE, Rockingham, NH

Built 1971 Load: 31.2 t ADT: 37,900

I-89 SB

Fair

Over: NH114

2.0MI NEW LONDON T.L., Merrimack, NH

Built 1967 Load: 31.2 t ADT: 9,249

I-93 SB

Fair

Over: NH112 NHRR

0.27 NE LINCOLN TL, Grafton, NH

Built 1972 Load: 31.2 t ADT: 10,383

NH127

Fair

Over: TAIL RACE

1.1 MILE N JCT US202 NH 9, Merrimack, NH

Built 1900 Load: 31.4 t ADT: 3,357

I-93 NB

Fair

Over: STEVENS POND

0.1 MI N BRIDGE ST., Hillsborough, NH

Built 1977 Load: 31.4 t ADT: 36,111

NH 12

Fair

Over: S BRANCH ASHUELOT RIVER

0.4MI FROM SWANZEY T.L., Cheshire, NH

Built 1962 Load: 31.4 t ADT: 8,843

NH 12

Fair

Over: S BR ASHUELOT RIVER

1.7MI FROM SWANZEY T.L., Cheshire, NH

Built 1962 Load: 31.4 t ADT: 8,843

I-93 SB

Fair

Over: NH104 NH132

1.05 MI N MERIDITH T.L., Belknap, NH

Built 1963 Load: 31.4 t ADT: 19,519

DUNDEE ROAD

Fair

Over: GREAT BROOK

3.4 MI BARTLETT T.L., Carroll, NH

Built 1930 Load: 31.5 t ADT: 214

I-89 NB

Fair

Over: HEATER ROAD

0.6 MI FROM HARDY HILL RD, Grafton, NH

Built 1966 Load: 31.5 t ADT: 15,942

KEARSARGE WAY

Fair

Over: CSX

0.3 MI JCT MARKET ST, Rockingham, NH

Built 1979 Load: 31.5 t ADT: 504

I-93 SB US 4 RAMP

Fair

Over: NHRR

0.1 MI S. CANTERBURY T/L, Merrimack, NH

Built 1958 Load: 31.7 t ADT: 6,743

I-89 SB

Fair

Over: NH 10

2.1 MI FROM SPRINGFIELD T, Sullivan, NH

Built 1967 Load: 31.7 t ADT: 9,549

I-89 NB

Fair

Over: NH 10

2.1 MI FROM SPRINGFIELD T, Sullivan, NH

Built 1967 Load: 31.7 t ADT: 10,644

US302

Fair

Over: SACO RIVER

1.0 MI FROM CARROLL TL, Carroll, NH

Built 1978 Load: 31.7 t ADT: 2,691

I-93 SB

Fair

Over: STEVENS POND

0.1 MI N BRIDGE ST., Hillsborough, NH

Built 1977 Load: 31.7 t ADT: 47,209

I-93 NB NH101 EB

Fair

Over: HANOVER STREET

1.8 MI W JCT RTE 28 A, Hillsborough, NH

Built 1960 Load: 31.7 t ADT: 46,422

OLD NH 9

Fair

Over: GRANITE LAKE OUTLET

0.7 MI FROM STODDARD TL, Cheshire, NH

Built 1932 Load: 31.7 t ADT: 483

CAUSEWAY

Fair

Over: JOE ENGLISH POND

0.2 MILES FROM ON-ORBIT D, Hillsborough, NH

Built 2008 Load: 31.7 t ADT: 10

NH114

Fair

Over: WARNER RIVER

3.8 MI FROM WARNER TL, Merrimack, NH

Built 1948 Load: 31.8 t ADT: 4,461

NH132(EASTSIDE DR)

Fair

Over: I-393 US 4 US202

1.4 MI EAST OF JCT I-93, Merrimack, NH

Built 1978 Load: 31.8 t ADT: 9,629

I-89 SB

Fair

Over: US 4 NH 10

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

Built 1966 Load: 31.8 t ADT: 19,605

I-89 NH 10 SB

Fair

Over: HEATER ROAD

0.6 MI FROM HARDY HILL RD, Grafton, NH

Built 1966 Load: 31.8 t ADT: 16,350

NH106

Fair

Over: SHAKER BROOK

4.0 MI N CONCORD TL, Merrimack, NH

Built 1951 Load: 31.8 t ADT: 12,671

Showing 501-550 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.