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

SCULPTURED ROCKS R

Good

Over: ATWELL BROOK

TOWN RD, Grafton, NH

Built 2018 Load: 38.7 t ADT: 74

RED FOX CROSSING

Good

Over: NELSON BROOK

TOWN ROAD, Hillsborough, NH

Built 2021 Load: 38.7 t ADT: 100

COOLIDGE WOODS RD

Good

Over: BLAKE BROOK

85 FEET FR BROOK ROAD, Belknap, NH

Built 1940 Load: 38.7 t ADT: 90

ANTRIM ROAD

Good

Over: MILL TAIL RACE

0.15 MI FR CONTOOCOOK VA, Hillsborough, NH

Built 1988 Load: 38.8 t ADT: 2,291

INGERSON ROAD

Good

Over: PRISCILLA BROOK

1 MI FROM US 2 WEST END, Coos, NH

Built 2015 Load: 38.8 t ADT: 90

NH152

Good

Over: NORTH RIVER

.3MI FROM JCT. RTE. 156, Rockingham, NH

Built 1970 Load: 38.8 t ADT: 3,415

KINGS HIGHWAY

Good

Over: KENNEDY BROOK

1.4 miles N jct NH123, Cheshire, NH

Built 2021 Load: 38.8 t ADT: 90

BOG ROAD

Good

Over: SAND BROOK

0.58 MI N GOULD POND JCT, Hillsborough, NH

Built 2015 Load: 38.9 t ADT: 90

NO DATA ENTERED

Good

Over: SO. BR. GALE RIVER

MAP 19, Grafton, NH

Built 2011 Load: 38.9 t ADT: 99

NO DATA ENTERED

Good

Over: SO. BR. GALE RIVER

MAP 19, Grafton, NH

Built 2011 Load: 38.9 t ADT: 50

NORTH ROAD

Good

Over: GARLAND BROOK

0.54 MI W JEFFERSON TL, Coos, NH

Built 1960 Load: 39.0 t ADT: 505

I-93 SB

Good

Over: HARVARD BROOK

2.4 MI NO WOODSTOCK TL, Grafton, NH

Built 1984 Load: 39.0 t ADT: 5,020

US302 NH 10 NH 18

Good

Over: AMMONOOSUC RIVER

3.9 MI LISBON TL, Grafton, NH

Built 1950 Load: 39.0 t ADT: 7,749

WESTVILLE ROAD

Good

Over: LITTLE RIVER

0.6 MI. RTE.125, Rockingham, NH

Built 2019 Load: 39.0 t ADT: 3,740

NH 18 NH116

Good

Over: INDIAN CREEK

0.80 MILE S. BETH. TL., Grafton, NH

Built 2017 Load: 39.0 t ADT: 1,214

BEARD ROAD

Good

Over: BEARDS BROOK

0.8 MI FR NH RTE 9, Hillsborough, NH

Built 1965 Load: 39.2 t ADT: 456

NH 25 NH 3A

Good

Over: BAKER RIVER

2.7 MI RUMNEY TL, Grafton, NH

Built 1968 Load: 39.2 t ADT: 13,460

CHAPMAN ROAD

Good

Over: PATTERSON BROOK

1 mi west US 3, Belknap, NH

Built 2019 Load: 39.2 t ADT: 90

FDR 53

Good

Over: W.BR MAD RIVER

MAP 38, Grafton, NH

Built 1998 Load: 39.2 t ADT: 99

NO DATA ENTERED

Good

Over: SCARFACE BROOK

MAP 19, Grafton, NH

Built 2011 Load: 39.2 t ADT: 99

NH106

Good

Over: I-393 US 4 US202

.4 MI W PEMBROOK TL, Merrimack, NH

Built 1988 Load: 39.4 t ADT: 14,017

BROOKVIEW DRIVE

Good

Over: BEAVER BROOK

HOOKSETT, Merrimack, NH

Built 2017 Load: 39.4 t ADT: 538

NH116

Good

Over: ISRAEL RIVER

1.2 MI SW JCT US 2, Coos, NH

Built 1987 Load: 39.4 t ADT: 1,029

NH 9 NH236

Good

Over: SALMON FALLS RIVER

MAINE S.L., Strafford, NH

Built 1962 Load: 39.4 t ADT: 13,156

I-93 NB C-D ROAD

Good

Over: I-89 TURKEY RIVER PED

AT BOW INTERCHANGE, Merrimack, NH

Built 1978 Load: 39.6 t ADT: 21,497

CATARACT AVENUE

Good

Over: NH 16 SP TPK

.3 MI FROM JCT. RT 16, Strafford, NH

Built 1957 Load: 39.6 t ADT: 1,114

CASCADE FLATS

Good

Over: TINKER BROOK

2 10th m. fr NH16 S. END, Coos, NH

Built 2018 Load: 39.6 t ADT: 480

NH113

Good

Over: COLD RIVER

2.3 MI E NO. SANDWICH VIL, Carroll, NH

Built 1958 Load: 39.6 t ADT: 536

NH 12

Good

Over: S BRANCH ASHUELOT RIVER

1.6 MI S TO TROY CENTER, Cheshire, NH

Built 1941 Load: 39.6 t ADT: 8,843

MAIN STREET

Good

Over: MASCOMA RIVER

.87 MI. FROM JCT. RTE. 4A, Grafton, NH

Built 2003 Load: 39.8 t ADT: 1,331

SHAKER HILL ROAD

Good

Over: MASCOMA RIVER

100 FT SW JCT INV RTE. 50, Grafton, NH

Built 2003 Load: 39.8 t ADT: 1,921

FEE TPK NB RAMP 4

Good

Over: RAMP 3B

.02 MI FROM ROBINSON RD, Hillsborough, NH

Built 1997 Load: 39.8 t ADT: 64,739

NH111

Good

Over: EXETER RIVER

0.6 MI FROM BRENTWOOD TL, Rockingham, NH

Built 1933 Load: 39.9 t ADT: 4,570

NH136

Good

Over: S BR PISCATAQUOG RIVER

2.6 MI FROM NEW BOSTON TL, Hillsborough, NH

Built 1967 Load: 39.9 t ADT: 1,500

GEORGIANA FALLS RD

Good

Over: HANSON BROOK

2.0 MI FROM WOODSTOCK TL, Grafton, NH

Built 1984 Load: 39.9 t ADT: 90

NO DATA ENTERED

Good

Over: EAST BRANCH SACO RIVER

NO DATA ENTERED, Carroll, NH

Built 2014 Load: 39.9 t ADT: 100

SHERBURNE ROAD

Good

Over: I-95

2.8MI S OF MAINE S/L, Rockingham, NH

Built 1971 Load: 40.0 t ADT: 1,602

NORTH/SOUTH LOCAL

Good

Over: ARTIST FALLS BROOK

At Artists Falls Brook, Carroll, NH

Built 1930 Load: 40.2 t ADT: 8,886

CHURCH ROAD

Good

Over: CHASE BROOK

0.19 MI FR WEST UNITY IN, Sullivan, NH

Built 2012 Load: 40.2 t ADT: 90

OLD MANCHESTER RD

Good

Over: NH101

3.2MI E OF CANDIA TL, Rockingham, NH

Built 1984 Load: 40.4 t ADT: 2,753

CANAL ROAD

Good

Over: GREAT EAST LAKE OUTLET

TOWN RD MAINE SL, Carroll, NH

Built 1920 Load: 40.4 t ADT: 867

TOWN ROAD #100

Good

Over: ARCHERTOWN BROOK

0.1 MI FR MILLER ROAD, Grafton, NH

Built 2021 Load: 40.5 t ADT: 90

YOUNG MOUNTAIN RD

Good

Over: COLD RIVER

160 FT FROM NH113A, Carroll, NH

Built 2018 Load: 40.5 t ADT: 90

KEARSARGE VAL RD

Good

Over: CASCADE BROOK

0.43MI NH11, Merrimack, NH

Built 2008 Load: 40.5 t ADT: 1,214

OLD WESTPORT ROAD

Good

Over: WHEELOCK BROOK

1.4 Mi.Fr Old Spofford RD, Cheshire, NH

Built 2011 Load: 40.5 t ADT: 335

NH 25

Good

Over: OSSIPEE RIVER

3.1 MI FROM OSSIPEE T.L., Carroll, NH

Built 2004 Load: 40.6 t ADT: 3,402

MCGAW BRIDGE ROAD

Good

Over: BABOOSIC BROOK

0.13 MI FR WIRE ROAD, Hillsborough, NH

Built 2016 Load: 40.7 t ADT: 1,358

BOW LAKE ROAD

Good

Over: SHERBURNE BROOK

0.75 STRAFFORD TL, Rockingham, NH

Built 2021 Load: 40.7 t ADT: 652

BROOK ROAD

Good

Over: BROCK BROOK

0.8 MI FR SHIN VALLEY RD, Grafton, NH

Built 2004 Load: 40.8 t ADT: 74

US 3

Good

Over: SUNCOOK RIVER BUCK ST

PEMBROKE-ALLENSTOWN TL, Merrimack, NH

Built 2007 Load: 40.8 t ADT: 9,099

Showing 1,451-1,500 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.