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

ANNIE NICHOLS ROAD

Good

Over: DAN HOLE RIVER

0.14 MI FR TUFTONBORO RD, Carroll, NH

Built 1994 Load: 24.5 t ADT: 90

NH 12

Good

Over: NHRR(ABD)

.8MI WESTMORELAND TL, Cheshire, NH

Built 1960 Load: 24.5 t ADT: 8,129

MOUSLEY BROOK ROAD

Good

Over: JACOBS BROOK

80 FT FROM ROAD INV NO.6, Grafton, NH

Built 2011 Load: 24.7 t ADT: 90

NH125

Good

Over: JONES BROOK

0.65 MI. S. WAKEFIELD TL, Strafford, NH

Built 1932 Load: 24.8 t ADT: 1,007

NH111

Good

Over: LITTLE RIVER

1.4 MI FROM JCT 101C, Rockingham, NH

Built 1930 Load: 24.9 t ADT: 6,017

SMITH RIVER ROAD

Good

Over: SMITH RIVER

.25 MI. W. OF HILL TL, Merrimack, NH

Built 1941 Load: 25.1 t ADT: 271

I-95 SB

Good

Over: CSX

0.6 MI N GREENLAND TL, Rockingham, NH

Built 1972 Load: 25.1 t ADT: 47,592

I-95 NB

Good

Over: CSX

0.6 MI N GREENLAND TL, Rockingham, NH

Built 1972 Load: 25.1 t ADT: 46,088

TARBOX LANE

Good

Over: EASTMAN BROOK

0.02 MI FR NH RTE 25C, Grafton, NH

Built 1999 Load: 25.2 t ADT: 90

MERIDEN HILL ROAD

Good

Over: LYMAN BROOK

1.3 MI FROM US RTE 3, Coos, NH

Built 1960 Load: 25.3 t ADT: 134

US 3

Good

Over: HARVARD BROOK

0.9 MI FROM WOODSTOCK TL, Grafton, NH

Built 1930 Load: 25.3 t ADT: 2,288

SURRY MT ACCESS RD

Good

Over: SPILLWAY CHANNEL

9.65 KM NORTH OF KEENE NH, Cheshire, NH

Built 1962 Load: 25.3 t ADT: 25

NH132

Good

Over: WILLIAMS BROOK

0.8 MI TILTON TL, Merrimack, NH

Built 1960 Load: 25.4 t ADT: 7,052

FARM ROAD

Good

Over: BLOW-ME-DOWN BROOK

45 FT FROM STAGE RD NO41, Sullivan, NH

Built 1940 Load: 25.4 t ADT: 90

GILES ROAD

Good

Over: CSX

1.06MI RTE 108, Rockingham, NH

Built 1920 Load: 25.5 t ADT: 504

SHORT FALLS ROAD

Good

Over: SUNCOOK RIVER

.5 MI S. JCT. RT 28, Merrimack, NH

Built 1950 Load: 25.5 t ADT: 1,505

COURT ST

Good

Over: NH 9 NH 10

1.1 MI FROM KEENE CENTER, Cheshire, NH

Built 1977 Load: 25.8 t ADT: 8,778

US 3

Good

Over: SIMMS STREAM

0.5 MI SW COLEBROOK TL, Coos, NH

Built 1956 Load: 25.9 t ADT: 3,419

STAGE ROAD

Good

Over: BLOW-ME-DOWN BROOK

0.7 MI FROM JCT 12A, Sullivan, NH

Built 1961 Load: 26.1 t ADT: 1,214

NH107

Good

Over: I-95

.8 MI N OF MASS SL, Rockingham, NH

Built 1967 Load: 26.1 t ADT: 21,790

FOREST ROAD

Good

Over: COLD RIVER

1.06 MI FROM LANGDONTL, Sullivan, NH

Built 1974 Load: 26.3 t ADT: 149

SO NEW BOSTON ROAD

Good

Over: S BR PISCATAQUOG RIVER

0.67MI. NEW BOSTON TL, Hillsborough, NH

Built 2020 Load: 26.3 t ADT: 285

MACKENZIE ROAD

Good

Over: ACADEMY BROOK

0.8 MI FR NH 106, Merrimack, NH

Built 2023 Load: 26.3 t ADT: 90

US 3

Good

Over: HUBBARD BROOK

5.3 MI. FROM CAMPTON TL, Grafton, NH

Built 1971 Load: 26.3 t ADT: 1,272

NH126

Good

Over: ISINGLASS RIVER

0.8 MI FROM STRAFFORD TL, Strafford, NH

Built 1947 Load: 26.5 t ADT: 1,245

NH 28A

Good

Over: I-93

0.1 MI HOOKSETT TL, Hillsborough, NH

Built 1976 Load: 26.5 t ADT: 6,544

JEWELL STREET

Good

Over: POWWOW RIVER

.18 MI. FROM MASS. SL, Rockingham, NH

Built 1960 Load: 26.5 t ADT: 1,093

HOOKSETT TURNPIKE

Good

Over: BELA BROOK

0.18 MI FR BOW TL, Merrimack, NH

Built 2021 Load: 26.6 t ADT: 711

KINSMAN ROAD

Good

Over: SMITH BROOK

0.27 MI. SPRINGFIELD TL, Grafton, NH

Built 1983 Load: 26.6 t ADT: 90

LYNDEBOROUGH ROAD

Good

Over: S BR PISCATAQUOG RIVER

0.8 MI FR COCHORAN HILL, Hillsborough, NH

Built 1940 Load: 26.6 t ADT: 430

NH103

Good

Over: STEVENS BROOK

.1 MI E JCT RT 89, Merrimack, NH

Built 1966 Load: 26.8 t ADT: 7,111

NH 88

Good

Over: I-95

.4 MI W. JCT RT 1, Rockingham, NH

Built 1975 Load: 26.9 t ADT: 3,486

LYMAN ROAD

Good

Over: MILL BROOK

1.09 MI NW JCT 302, Grafton, NH

Built 1928 Load: 26.9 t ADT: 1,214

NH175

Good

Over: EASTMAN BROOK

.2 MI FROM THORNTON TL, Grafton, NH

Built 1973 Load: 26.9 t ADT: 180

NH126

Good

Over: BIG RIVER

3.5 MI FROM STRAFFORD TL, Belknap, NH

Built 1964 Load: 27.1 t ADT: 3,634

TOWN HOUSE ROAD

Good

Over: GEER BROOK

3.75 MI. FROM JCT. 12-A, Sullivan, NH

Built 1981 Load: 27.1 t ADT: 632

EAST MILAN ROAD

Good

Over: STEARNS BROOK

1.4MI FROM BERLIN TL, Coos, NH

Built 1982 Load: 27.1 t ADT: 999

CIRCUMFERENTIAL WB

Good

Over: MERRIMACK RIVER CSX

NASHUA-HUDSON TL, Hillsborough, NH

Built 1973 Load: 27.1 t ADT: 72,003

US 4

Good

Over: CSX

1.5 MI. FROM JCT. RTE 108, Strafford, NH

Built 1966 Load: 27.3 t ADT: 11,281

MAIN STREET

Good

Over: MASCOMA RIVER

.3 MI. SW FROM INV RTE 40, Grafton, NH

Built 1954 Load: 27.6 t ADT: 1,331

NH 25

Good

Over: GROTON HOLLOW BROOK

5.5 WENTWORTH T.L., Grafton, NH

Built 1965 Load: 27.8 t ADT: 6,486

NH113

Good

Over: BEARCAMP RIVER

0.9 MI E SANDWICH TL, Carroll, NH

Built 1972 Load: 27.8 t ADT: 764

PAGE ROAD

Good

Over: NORTH BRANCH

0.4 MI. BENTON TL, Grafton, NH

Built 2016 Load: 27.9 t ADT: 90

I-93 NB

Good

Over: US 3 NHRR

1.72 MI THORNTON TL, Grafton, NH

Built 1970 Load: 27.9 t ADT: 7,236

INDIAN BROOK DRIVE

Good

Over: NH 16 SP TPK

1.8 MI FROM ROCHESTER TL, Strafford, NH

Built 1957 Load: 28.1 t ADT: 31,599

US 4

Good

Over: NH108

.7 MI FROM MADBURY T.L., Strafford, NH

Built 1966 Load: 28.1 t ADT: 10,308

NH 11

Good

Over: GUNSTOCK RIVER

2.6 MI NE LACONIA TL, Belknap, NH

Built 1958 Load: 28.1 t ADT: 7,205

NH 84

Good

Over: I-95

.25 MI N. SEABROOK T.L., Rockingham, NH

Built 1975 Load: 28.1 t ADT: 2,804

NH 16

Good

Over: ELLIS RIVER

5.6 MI FROM BARTLETT TL, Carroll, NH

Built 1933 Load: 28.1 t ADT: 3,513

DORCHESTER ROAD

Good

Over: GRANT BROOK

1.3 MI FROM JCT RTE 10, Grafton, NH

Built 1963 Load: 28.1 t ADT: 624

Showing 1,101-1,150 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.