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

WEST STREET

Good

Over: GREAT BROOK

0.05MI FROM NH31, Hillsborough, NH

Built 2019 Load: 63.5 t ADT: 90

SCHOOLHOUSE LANE

Good

Over: MINK BROOK

0.9 MI FROM GREENSBORO R, Grafton, NH

Built 1981 Load: 64.7 t ADT: 480

FAIRMOUNT STREET

Good

Over: BROAD ST PKWY CSX

60 FT FROM FIFIELD LANE, Hillsborough, NH

Built 2015 Load: 65.0 t ADT: 1,219

NH123

Good

Over: WARREN BROOK

2.86 MI. SE JCT. NH 123-A, Cheshire, NH

Built 2012 Load: 65.1 t ADT: 1,253

I-93 NB

Good

Over: NHRR WINNIPESAUKEE RIVER

TILTON TL, Merrimack, NH

Built 1960 Load: 65.2 t ADT: 15,272

WISWALL ROAD

Good

Over: LAMPREY RIVER

0.6 MI. LEE TL, Strafford, NH

Built 2010 Load: 65.6 t ADT: 253

CONVERSE ROAD

Good

Over: WHITING BROOK

TOWN RD, Hillsborough, NH

Built 2015 Load: 65.7 t ADT: 90

NORTH SHORE ROAD

Good

Over: GEORGES BROOK

0.41 MI. FROM JCT. 3-A, Grafton, NH

Built 1900 Load: 65.8 t ADT: 1,214

US 3 BUS NH 11A

Good

Over: DURKEE BROOK

.4 MI N.E. BELMONT T.L., Belknap, NH

Built 2022 Load: 66.1 t ADT: 12,884

NH 28 NH109

Good

Over: SMITH RIVER

3.5 MI FROM ALTON TL, Carroll, NH

Built 1935 Load: 66.3 t ADT: 8,679

US202 NH 9

Good

Over: LIBERTY HILL ROAD

2.86 MI FROM HILLSBORO TL, Merrimack, NH

Built 1974 Load: 66.6 t ADT: 14,242

I-293 FEE TPK NB

Good

Over: NH 3A

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

Built 1957 Load: 66.6 t ADT: 19,972

NH140

Good

Over: WINNIPESAUKEE RIVER

0.4 MI S JCT RTE 3, Belknap, NH

Built 1968 Load: 66.6 t ADT: 10,577

NH 16

Good

Over: SESSIONS BROOK

1.1 MI S CAMBRIDGE TL, Coos, NH

Built 1926 Load: 67.1 t ADT: 1,514

I-93 SB

Good

Over: BEAVER BROOK

Derry T/L, Rockingham, NH

Built 2020 Load: 67.1 t ADT: 40,312

NH 11

Good

Over: SUGAR RIVER

6.1 MI. FROM NEW LONDON T, Sullivan, NH

Built 1957 Load: 67.3 t ADT: 6,479

FEE TPK N&S RAMPS

Good

Over: SALMON BROOK

3.3 MI N MASS SL, Hillsborough, NH

Built 1955 Load: 67.9 t ADT: 125,991

BALSAMS BK DR PVT

Good

Over: BALSAM POND BROOK

0.3 MI WEST OF DIXVILLE, Coos, NH

Built 2008 Load: 68.1 t ADT: 20

BALDWIN STREET

Good

Over: BROAD ST PKWY CSX

0.18 MI FR FAIRMONT ST, Hillsborough, NH

Built 2014 Load: 68.1 t ADT: 1,955

NH155

Good

Over: CSX

1.4 MI FROM DURHAM TL, Strafford, NH

Built 2007 Load: 68.2 t ADT: 10,245

PLEASANT VALLEY RD

Good

Over: HEATH BROOK

0.95 MILES FROM NH 28, Carroll, NH

Built 2020 Load: 68.4 t ADT: 1,017

CASS MILL ROAD

Good

Over: SMITH RIVER

AT ALEXANDRIA TL, Merrimack, NH

Built 2000 Load: 68.9 t ADT: 90

I-93 SB

Good

Over: NHRR WINNIPESAUKEE RIVER

TILTON TL, Merrimack, NH

Built 1960 Load: 68.9 t ADT: 15,211

COLLEGE ROAD

Good

Over: WILLEY BROOK

0.42MI NH28, Carroll, NH

Built 2002 Load: 69.4 t ADT: 569

NH 25 NH118

Good

Over: BAKER RIVER

2.0 MI FROM RUMNEY TL, Grafton, NH

Built 1960 Load: 69.6 t ADT: 3,351

WILDER ROAD

Good

Over: NUBANUSIT BROOK

0.1 MI FR MAIN ST, Hillsborough, NH

Built 2004 Load: 69.7 t ADT: 272

TOWN FARM ROAD

Good

Over: SPICKET RIVER

1.10 MI FROM MASS. SL, Rockingham, NH

Built 2016 Load: 69.8 t ADT: 3,511

LONGVIEW ROAD

Good

Over: MOOSE BROOK

.08 MI FROM NH RTE 123, Hillsborough, NH

Built 1930 Load: 70.2 t ADT: 425

CAVENDER ROAD

Good

Over: FERGUSON BROOK

0.4 MI FR GREENFIELD TL, Hillsborough, NH

Built 2006 Load: 70.2 t ADT: 90

NH116

Good

Over: WHITCHER BROOK

2 MI E HAVERHILL TL, Grafton, NH

Built 2003 Load: 70.9 t ADT: 1,214

EAST SURRY ROAD

Good

Over: STURTEVANT BROOK

1.0MI. TL SURRY, Cheshire, NH

Built 2012 Load: 70.9 t ADT: 817

NH 16 NH 25

Good

Over: CHOCORUA RIVER

0.8 MI. TAMWORTH T.L., Carroll, NH

Built 1955 Load: 71.7 t ADT: 11,527

FEE TPK

Good

Over: BABOOSIC BROOK

2.9 MI FROM BEDFORD T.L., Hillsborough, NH

Built 1954 Load: 71.8 t ADT: 73,393

BLAKE HILL ROAD

Good

Over: BLAKE BROOK

0.8 MI FR OLD BRISTOL RD, Belknap, NH

Built 1999 Load: 71.8 t ADT: 142

FRAZIER ROAD

Good

Over: FRAZIER BROOK

.06 MI FR WILMOT T/L, Merrimack, NH

Built 1987 Load: 72.6 t ADT: 82

WELLINGTON ROAD

Good

Over: CONVERSEVILLE BROOK

0.1 MI. RTE.119, Cheshire, NH

Built 2021 Load: 73.1 t ADT: 828

MAIN STREET

Good

Over: CONTOOCOOK RIVER

85 FT FR GRANITE ST, Hillsborough, NH

Built 1940 Load: 73.3 t ADT: 6,029

NH109

Good

Over: NINETEEN MILE BAY

5.0 MI SE MOULTONBORO TL, Carroll, NH

Built 1993 Load: 73.5 t ADT: 2,481

LAWRENCE ROAD

Good

Over: SPICKET RIVER

1.08 MI FR MASS SL, Rockingham, NH

Built 2010 Load: 73.9 t ADT: 6,333

NH121A

Good

Over: EXETER RIVER

2.85 MI. SE CHESTER TL, Rockingham, NH

Built 1937 Load: 74.1 t ADT: 3,677

NH107

Good

Over: GRIFFIN BROOK

DEERFIELD TL, Merrimack, NH

Built 2010 Load: 74.7 t ADT: 3,315

NH 11 NH103

Good

Over: RAM BROOK

2.01 MI. E. CLAREMONT TL, Sullivan, NH

Built 2008 Load: 74.8 t ADT: 9,812

I-93 SB

Good

Over: EASTMAN BROOK

2.51 MI THORNTON TL, Grafton, NH

Built 1972 Load: 75.1 t ADT: 7,060

WENTWORTH ROAD

Good

Over: BROOK

DANBURY TL, Grafton, NH

Built 1989 Load: 75.3 t ADT: 90

NH 10

Good

Over: MINK BROOK

0.2 MI FROM LEBANON TL, Grafton, NH

Built 2006 Load: 75.4 t ADT: 6,076

BLUFF STREET

Good

Over: HITTYTITY BROOK

2.3 MI FROM MASS. SL, Rockingham, NH

Built 2013 Load: 77.6 t ADT: 2,269

MILL ROAD

Good

Over: GREAT BROOK

0.22 MI FR OLD KEENE RD, Cheshire, NH

Built 2010 Load: 78.0 t ADT: 240

WILLEY ROAD

Good

Over: WEST BRANCH BROOK

0.5 MI FROM ELSWTH PD RD, Grafton, NH

Built 2009 Load: 79.7 t ADT: 90

I-93 SB

Good

Over: CONNECTOR ROAD

0.18 MI N WOODSTOCK TL, Grafton, NH

Built 1973 Load: 79.8 t ADT: 5,027

NH114

Good

Over: STOCKER BROOK

.78 MI. EAST OF JCT. NH10, Sullivan, NH

Built 1929 Load: 80.2 t ADT: 1,519

Showing 2,251-2,300 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.