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

NH 16

Fair

Over: PEABODY RIVER

2.3 MI JACKSON TL, Coos, NH

Built 1960 Load: 79.8 t ADT: 3,317

HIGH STREET

Fair

Over: SUGAR RIVER

0.3 MI. RTE.103B, Sullivan, NH

Built 1920 Load: 80.0 t ADT: 614

BROOK ROAD

Fair

Over: JOE ENGLISH BROOK

1.4 MI FR DODGE/AUSTIN R, Hillsborough, NH

Built 1985 Load: 83.1 t ADT: 187

I-93 SB

Fair

Over: SALMON BROOK

3.3MI F. TILTON T.L., Belknap, NH

Built 1962 Load: 83.5 t ADT: 14,007

I-89 NH 10 SB

Fair

Over: SMITH POND ROAD

2.2 MI FROM GRANTHAM T.L., Grafton, NH

Built 1959 Load: 83.7 t ADT: 11,892

I-89 NH 10 NB

Fair

Over: SMITH POND ROAD

2.2 MI GRANTHAM T.L., Grafton, NH

Built 1959 Load: 83.7 t ADT: 11,631

US 2

Fair

Over: COLD BROOK

4.5 MI FROM JEFFERSON TL, Coos, NH

Built 1966 Load: 88.9 t ADT: 5,144

I-89 NH 10 NB

Fair

Over: MILLER POND ROAD

4.6 MI FROM SPRINGFIELD T, Sullivan, NH

Built 1959 Load: 89.2 t ADT: 10,644

DEERFIELD ROAD

Fair

Over: BEAR BROOK

1.3 MI NE JCT 28, Merrimack, NH

Built 1980 Load: 89.8 t ADT: 2,697

NH 12A NH123

Fair

Over: COLD RIVER

0.7 MI. FROM LANGDON TL, Cheshire, NH

Built 2009 Load: 89.8 t ADT: 1,416

NH122 AMHERST ST

Fair

Over: BEAVER BROOK

2.15 MI NE MILFORD TL, Hillsborough, NH

Built 1940 Load: 89.8 t ADT: 6,927

NH 11 NH 12

Fair

Over: LITTLE SUGAR RIVER

2.2 MI. FROM CLAREMONT TL, Sullivan, NH

Built 1964 Load: 89.8 t ADT: 7,817

MT CLINTON ROAD

Fair

Over: SOKOKIS BROOK

3.57 MI NE JCT 302, Coos, NH

Built 1934 Load: 89.8 t ADT: 101

GULF ROAD

Fair

Over: FRESH CREEK

1.5 MI. FROM JCT. RTE. 4, Strafford, NH

Built 1948 Load: 89.8 t ADT: 5,721

I-93

Fair

Over: BLACK BROOK

2.8 MI SUGARHILL TL, Grafton, NH

Built 1959 Load: 89.8 t ADT: 5,172

I-89 NH 10 NB

Fair

Over: SKINNER BROOK

3.95 MI SPRINGFIELD T.L., Sullivan, NH

Built 1959 Load: 89.8 t ADT: 10,644

I-89 NH 10 SB

Fair

Over: SKINNER BROOK

4.43 MI SPRINGFIELD T.L., Sullivan, NH

Built 1972 Load: 89.8 t ADT: 10,825

NH120

Fair

Over: MINK BROOK

.3 MI. FROM LEBANON TL, Grafton, NH

Built 1969 Load: 89.8 t ADT: 9,838

US 2

Fair

Over: STAG HOLLOW BROOK

2.5 MI FROM RANDOLPH TL, Coos, NH

Built 1969 Load: 89.8 t ADT: 4,701

US 3

Fair

Over: PAUGUS BAY

7.4 MI FROM BELMONT TL, Belknap, NH

Built 1933 Load: 89.8 t ADT: 13,478

I-93 PARKWAY

Fair

Over: WALKER BROOK

7.3 MI N WOODSTOCK T.L., Grafton, NH

Built 1985 Load: 89.8 t ADT: 11,427

I-293 FEE TPK

Fair

Over: HACKETT HILL ROAD

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

Built 1956 Load: 89.8 t ADT: 39,944

I-93 NB I-93 RAMP

Fair

Over: COHAS BROOK

1.6 MI E JCT RT 28, Hillsborough, NH

Built 1962 Load: 89.8 t ADT: 37,900

I-93

Fair

Over: WILLIAMS BROOK

4.19MI CANTERBURY TL, Merrimack, NH

Built 1960 Load: 89.8 t ADT: 30,483

BEAN BROOK ROAD

Fair

Over: BEAN BROOK

0.5 MI. PIERPONT TL, Grafton, NH

Built 1995 Load: 89.8 t ADT: 90

US202

Fair

Over: OUTLET PRATT POND

0.4 MI JAFFREY TL, Hillsborough, NH

Built 1956 Load: 89.8 t ADT: 9,478

NH 9

Fair

Over: ISLAND POND OUTLET

2.2 MI. W. ANTRIM TL, Cheshire, NH

Built 1964 Load: 89.8 t ADT: 6,137

I-93 SB

Fair

Over: INDIAN CREEK

0.7 MI S BETHLEHEM TL, Grafton, NH

Built 1959 Load: 89.8 t ADT: 2,593

NH 11

Fair

Over: OTTER POND OUTLET

0.5 MI. FROM NEW LONDON T, Sullivan, NH

Built 1954 Load: 89.8 t ADT: 8,214

NH 12

Fair

Over: TROY BROOK

0.4 MI N TO KEENE T.L., Cheshire, NH

Built 1970 Load: 89.8 t ADT: 12,962

NH 25

Fair

Over: STONY BROOK

5.4 MI FROM OSSIPEE TL, Carroll, NH

Built 1986 Load: 89.8 t ADT: 3,737

I-93 SB

Fair

Over: HUBBARD BROOK

1.9 MI S WOODSTOCK TL, Grafton, NH

Built 1970 Load: 89.8 t ADT: 7,156

I-93 NB

Fair

Over: HUBBARD BROOK

1.3 MI S WOODSTOCK TL, Grafton, NH

Built 1970 Load: 89.8 t ADT: 6,997

US302

Fair

Over: BROOK

3.8 MI. FROM N.H. 16, Carroll, NH

Built 1961 Load: 99.9 t ADT: 5,300

RIVER ROAD

Fair

Over: FOGG BROOK

3.89 MI N. OF JCT. 104, Grafton, NH

Built 1974 Load: 99.9 t ADT: 553

DREWSVILLE ROAD

Fair

Over: GREAT BROOK

1.49 MI. N. WALPOLE TL, Sullivan, NH

Built 1955 Load: 99.9 t ADT: 870

HEMLOCK ROAD

Fair

Over: GREAT BROOK

100 FT FROM MAIN ST, Sullivan, NH

Built 1940 Load: 99.9 t ADT: 90

DAISY HILL ROAD

Fair

Over: GREAT BROOK

0.09 MI FR NH RTE 120, Grafton, NH

Built 1955 Load: 99.9 t ADT: 618

NH 10

Fair

Over: TROUT BROOK

5.58 MI N OF HANOVER TL, Grafton, NH

Built 1969 Load: 99.9 t ADT: 1,615

NO DATA ENTERED

Good

Over: ALBANY BROOK

NO DATA ENTERED, Carroll, NH

Built 1998 ADT: 10

NO DATA ENTERED

Good

Over: TRIB TO LOUISVILLE BROOK

NO DATA ENTERED, Carroll, NH

Built 2023 ADT: 50

PASSACONAWAY ROAD

Good

Over: SWIFT RIVER

0.1 MI FR KANCAMAGUS HWY, Carroll, NH

Built 1858 Load: 5.9 t ADT: 308

GUNN MOUNTAIN ROAD

Good

Over: ASHUELOT RIVER

0.02MI NH119, Cheshire, NH

Built 1864 Load: 6.4 t ADT: 809

NO DATA ENTERED

Good

Over: NO DATA ENTERED

NO DATA ENTERED, Grafton, NH

Built 2000 Load: 7.5 t ADT: 50

NO DATA ENTERED

Good

Over: BUZZELL BROOK

NO DATA ENTERED, Grafton, NH

Built 2000 Load: 7.5 t ADT: 50

BRADFORD CENTER RD

Good

Over: W BR WARNER RIVER

6.3 MI WASHINGTON TL, Merrimack, NH

Built 1854 Load: 8.6 t ADT: 90

NH113A

Good

Over: COLD RIVER

0.9 MI WING ROAD ROAD, Carroll, NH

Built 1935 Load: 11.1 t ADT: 480

BEARCAMP POND ROAD

Good

Over: BEARCAMP RIVER

0.5 MI FROM NH RTE 25, Carroll, NH

Built 1900 Load: 13.2 t ADT: 90

MAPLE STREET

Good

Over: NHRR(ABD)

0.04 MI NH 11, Merrimack, NH

Built 1930 Load: 13.9 t ADT: 319

RIVERDALE ROAD

Good

Over: NEWFOUND RIVER

0.02 MI WEST OF NH 3A, Grafton, NH

Built 1949 Load: 14.5 t ADT: 125

Showing 1,001-1,050 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.