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

NEW MARKET ROAD

Fair

Over: WARNER RIVER

0.17 MI FROM NH RTE 103, Merrimack, NH

Built 1840 Load: 1.8 t ADT: 420

MAIN STREET

Fair

Over: ASHUELOT RIVER

340 FT FROM WINCHESTER S, Cheshire, NH

Built 1832 Load: 2.7 t ADT: 2,159

RIVER ROAD

Fair

Over: CLAY BROOK

0.3 MI. TL ORFORD, Grafton, NH

Built 1885 Load: 2.9 t ADT: 151

MECHANIC STREET

Fair

Over: ISRAEL RIVER

0.3 MI FROM US RTE 3, Coos, NH

Built 1862 Load: 3.4 t ADT: 743

ROOT HILL ROAD

Fair

Over: MILL BROOK

1.3 MI NH 120, Sullivan, NH

Built 1883 Load: 3.6 t ADT: 91

JOPPA ROAD WEST

Fair

Over: WARNER RIVER

.08 MI FROM NH RTE 103, Merrimack, NH

Built 1853 Load: 4.7 t ADT: 100

BLAIR ROAD

Fair

Over: PEMIGEWASSET RIVER

0.15 MI E JCT US 3, Grafton, NH

Built 1869 Load: 5.4 t ADT: 1,117

CLARKVILLE ROAD

Fair

Over: S BR PISCATAQUOG RIVER

TOWN RD, Hillsborough, NH

Built 1930 Load: 5.4 t ADT: 17

MILL ROAD

Fair

Over: RICE BROOK

0.2 MI. RTE.32, Cheshire, NH

Built 1983 Load: 5.4 t ADT: 68

DURGIN BRIDGE ROAD

Fair

Over: COLD RIVER

100 FT FR BEARCAMPPOND R, Carroll, NH

Built 1869 Load: 5.4 t ADT: 162

CARLTON ROAD

Fair

Over: SOUTH BROOK

0.20 MI. RTE 32, Cheshire, NH

Built 1869 Load: 5.4 t ADT: 493

EAST SIDE ROAD

Fair

Over: SACO RIVER

1.7MI N ALBANY TL, Carroll, NH

Built 1890 Load: 5.8 t ADT: 3,419

NO DATA ENTERED

Fair

Over: NO DATA ENTERED

NO DATA ENTERED, Carroll, NH

Built 1990 Load: 5.8 t ADT: 10

DRAKE ROAD

Fair

Over: WILKINSON BROOK

1.13 MI. OSSIPEE TL, Carroll, NH

Built 1930 Load: 5.9 t ADT: 90

BEARD ROAD

Fair

Over: BEARDS BROOK

2.7 MI FR NH RTE 9, Hillsborough, NH

Built 1900 Load: 6.1 t ADT: 90

BUMPS INTERVALE

Fair

Over: BEEBE RIVER

80 FT FR PERCH POND RD, Grafton, NH

Built 1877 Load: 6.4 t ADT: 90

COLUMBIA BRIDGE RD

Fair

Over: CONNECTICUT RIVER

VERMONT STATE LINE, Coos, NH

Built 1912 Load: 6.5 t ADT: 257

MUMMERY ROAD EAST

Fair

Over: COLD BROOK

35FT RTE 10, Sullivan, NH

Built 1940 Load: 6.5 t ADT: 90

W HOPKINTON ROAD

Fair

Over: CONTOOCOOK RIVER

206 FT FR CLEMENT HILL R, Merrimack, NH

Built 1853 Load: 6.5 t ADT: 545

NH 16A

Fair

Over: ELLIS RIVER

.05 MI N OF JCT 16, Carroll, NH

Built 1876 Load: 6.5 t ADT: 3,842

MT ORNE ROAD

Fair

Over: CONNECTICUT RIVER

AT VERMONT STATE LINE, Coos, NH

Built 1911 Load: 6.5 t ADT: 636

PORTER ROAD

Fair

Over: WILD AMMONOOSUC RIVER

340 FEET FR NH 112, Grafton, NH

Built 1849 Load: 7.3 t ADT: 618

OLD ROXBURY ROAD

Fair

Over: MINNEWAWA BROOK

1.2 MI. ROXBURY TL, Cheshire, NH

Built 1930 Load: 7.3 t ADT: 90

PARK STREET

Fair

Over: CSX

0.22MI RTE 111A, Rockingham, NH

Built 1900 Load: 8.2 t ADT: 764

HAMMOND HILL ROAD

Fair

Over: WOODMAN BROOK

1.8 MI BRIDGEWATER HILL, Grafton, NH

Built 1930 Load: 8.5 t ADT: 90

NEW ROAD

Fair

Over: CSX

0.12MI. RTE 108, Rockingham, NH

Built 1930 Load: 8.6 t ADT: 530

SQUAG CITY ROAD

Fair

Over: BLOW-ME-DOWN BROOK

80 FT FR PLAINFIELD TL, Sullivan, NH

Built 1877 Load: 8.7 t ADT: 28

FORD MILL ROAD

Fair

Over: SMITH RIVER

.09 MI MASCOMA RD, Merrimack, NH

Built 1988 Load: 9.1 t ADT: 90

WEST BATH ROAD

Fair

Over: AMMONOOSUC R NHRR(ABD)

0.1 MI NH 10, Grafton, NH

Built 1832 Load: 9.3 t ADT: 90

RIVERSIDE DRIVE

Fair

Over: MASCOMA RIVER

1.0MI JCT US. 4, Grafton, NH

Built 1991 Load: 9.8 t ADT: 1,683

OLD BRIDGE STREET

Fair

Over: BEAVER BROOK

0.8 MI FR NH RTE 38, Hillsborough, NH

Built 1920 Load: 9.8 t ADT: 7,140

COOMBS BRIDGE RD

Fair

Over: ASHUELOT RIVER

0.27MI. NH119, Cheshire, NH

Built 1837 Load: 9.8 t ADT: 609

RIVER STREET

Fair

Over: SQUAM RIVER

1.4 MI FR NH RTE 25, Grafton, NH

Built 1990 Load: 10.0 t ADT: 649

COLBY HILL ROAD

Fair

Over: BLOODS BROOK

175 FT FR BLOODBROOK RD, Sullivan, NH

Built 1880 Load: 10.4 t ADT: 135

CHAMBERS ROAD

Fair

Over: CHERRY MILL BROOK

.6 MI FR CARROL TL, Coos, NH

Built 1920 Load: 10.5 t ADT: 90

OLD ROUTE 3A

Fair

Over: NEEDLE SHOP BROOK

2.41 KM SW OF HILL, Merrimack, NH

Built 1910 Load: 10.7 t ADT: 1

FLUME BUS ROUTE

Fair

Over: PEMIGEWASSET RIVER

THE FLUME, Grafton, NH

Built 1886 Load: 10.8 t ADT: 50

MAIN STREET

Fair

Over: LAMPREY RIVER

0.7 MI. RTE 125, Rockingham, NH

Built 1936 Load: 10.9 t ADT: 3,948

SAWYERS CROSSING

Fair

Over: ASHUELOT RIVER

1.71MI E JCT NH 10, Cheshire, NH

Built 1859 Load: 11.6 t ADT: 3,494

FOREST ROAD

Fair

Over: CONTOOCOOK RIVER

1.0 MI EAST OF RTE 202, Hillsborough, NH

Built 1937 Load: 12.4 t ADT: 2,776

NARROWS ROAD

Fair

Over: SUNCOOK LAKE CHANNEL

0.4 MI FR WHITE OAK RD, Belknap, NH

Built 1960 Load: 12.7 t ADT: 346

BENNETT ROAD

Fair

Over: CSX

0.9MI. RTE 108, Strafford, NH

Built 1910 Load: 12.7 t ADT: 642

NH123

Fair

Over: COLD RIVER

.22 MI SE LANGDON TL, Cheshire, NH

Built 1919 Load: 12.7 t ADT: 2,763

CHEMICAL ROAD

Fair

Over: WARNER RIVER

0.2 MI FROM JOPPA ROAD, Merrimack, NH

Built 1966 Load: 12.7 t ADT: 84

WINTER STREET

Fair

Over: SQUAM RIVER

0.2 MI FR NH RTE 25, Grafton, NH

Built 1941 Load: 13.6 t ADT: 1,014

DEPOT ROAD

Fair

Over: SUNCOOK RIVER

0.07 MI FR NH RTE 126, Belknap, NH

Built 1950 Load: 13.6 t ADT: 90

MILLBROOK ROAD

Fair

Over: MILL BROOK

0.9MI. ORANGE TL, Grafton, NH

Built 2005 Load: 13.6 t ADT: 90

LOWER RIDGE ROAD

Fair

Over: ACADEMY BROOK

1.6 MI FR NH 106, Merrimack, NH

Built 1931 Load: 13.6 t ADT: 618

BREEZY HILL ROAD

Fair

Over: POND BROOK

.9 MI FROM WARNER TL, Merrimack, NH

Built 1950 Load: 14.3 t ADT: 337

SOUTH ROAD

Fair

Over: S BR ASHUELOT RIVER

.12MI JCT NH 32, Cheshire, NH

Built 1936 Load: 14.3 t ADT: 1,106

Showing 1-50 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.