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

I-393 US 4 US202

Poor

Over: I-93

0.4 MI. E. JCT US 3, Merrimack, NH

Built 1958 Load: 15.1 t ADT: 44,531

GULF ROAD

Poor

Over: SALMON FALLS RIVER

0.1 MI FROM MAINE SL, Strafford, NH

Built 1950 Load: 15.1 t ADT: 5,994

STAGE ROAD

Poor

Over: BLOW-ME-DOWN BROOK

2.0 MI SE JCT 12A, Sullivan, NH

Built 1954 Load: 15.1 t ADT: 736

NH 12

Poor

Over: NHRR(ABD)

0.3MI TO TROY CENTER, Cheshire, NH

Built 1957 Load: 15.1 t ADT: 7,947

NH127

Poor

Over: BLACKWATER RIVER

4.8 MI FROM WARNER TL, Merrimack, NH

Built 1941 Load: 15.1 t ADT: 1,443

NH 1B

Poor

Over: LITTLE HARBOR

1.1 MI JCT RT 1-A, Rockingham, NH

Built 1942 Load: 15.3 t ADT: 3,283

SCRIBNER ROAD

Poor

Over: EXETER RIVER

0.59MI. RTE 107, Rockingham, NH

Built 1941 Load: 15.4 t ADT: 238

CONTOOCOOK FALLS R

Poor

Over: CONTOOCOOK RIVER

0.3 MI. HENNIKER TL, Hillsborough, NH

Built 1933 Load: 15.4 t ADT: 701

POTATO ROAD

Poor

Over: INDIAN RIVER

1.5 MI FROMENFIELD TL, Grafton, NH

Built 1930 Load: 16.0 t ADT: 624

BRIDGE STREET

Poor

Over: SPICKET RIVER

1.0MI MASS SL, Rockingham, NH

Built 1900 Load: 16.1 t ADT: 5,463

NH 11

Poor

Over: NHRR(ABD)

0.6 MI FROM FRANKLIN TL, Merrimack, NH

Built 1929 Load: 16.3 t ADT: 2,622

RIVER ROAD

Poor

Over: CLAY BROOK

.23 MI S. PLYMOUTH T.L., Grafton, NH

Built 1900 Load: 16.3 t ADT: 90

HANSON ROAD

Poor

Over: EXETER RIVER

75FT. NH102, Rockingham, NH

Built 1932 Load: 16.3 t ADT: 1,690

TRUES BROOK ROAD

Poor

Over: BLOODS BROOK

0.4 MI FR PLAINFIELD TL, Grafton, NH

Built 1952 Load: 16.3 t ADT: 1,068

PLAINS ROAD

Poor

Over: MILL BROOK

1.0 MI FROM LYMAN TL, Grafton, NH

Built 1975 Load: 16.3 t ADT: 90

ARCHERTOWN ROAD

Poor

Over: JACOBS BROOK

.3 Mi.From NH10, Grafton, NH

Built 1930 Load: 16.3 t ADT: 239

MAIN STREET

Poor

Over: BEAVER BROOK

1.75 MI JCT 128, Hillsborough, NH

Built 1900 Load: 16.3 t ADT: 5,974

VILLAGE ROAD

Poor

Over: CLEMENT BROOK

0.5 MI. US2, Coos, NH

Built 1929 Load: 16.3 t ADT: 47

HILLDALE AVE

Poor

Over: POWWOW RIVER

0.8 MI FR NEWTON TL, Rockingham, NH

Built 1920 Load: 16.3 t ADT: 187

WHITEHALL ROAD

Poor

Over: POWWOW RIVER

0.8 MI FR MASS SL, Rockingham, NH

Built 1976 Load: 16.3 t ADT: 573

FISH HATCHERY ROAD

Poor

Over: PATCH BROOK

0.17MI NH25, Grafton, NH

Built 1930 Load: 16.3 t ADT: 44

NH 28

Poor

Over: SUNCOOK RIVER

AT PEMBROKE TL, Merrimack, NH

Built 1958 Load: 16.8 t ADT: 9,436

I-89 NB

Poor

Over: US 4 NH 10

2.6 MI FROM VT SL, Grafton, NH

Built 1966 Load: 16.8 t ADT: 22,282

WALES BRIDGE ROAD

Poor

Over: SOUCOOK RIVER

1.3 MI FROM CONCORD TL, Merrimack, NH

Built 1934 Load: 16.8 t ADT: 352

SAND HILL ROAD

Poor

Over: BAKER RIVER

.06 MI FROM NH RTE 25, Grafton, NH

Built 1928 Load: 16.8 t ADT: 402

NFSR XH22

Poor

Over: HUBBARD BROOK

MAP 36, Grafton, NH

Built 1961 Load: 16.8 t ADT: 50

WILTON ROAD

Poor

Over: SOUHEGAN RIVER

260FT RTE 31, Hillsborough, NH

Built 1938 Load: 17.2 t ADT: 1,824

BEAVER BROOK ROAD

Poor

Over: BEAVER BROOK

0.4 MI. AMHERST TL, Hillsborough, NH

Built 1932 Load: 17.2 t ADT: 687

MOUNTAIN ROAD

Poor

Over: COLD BROOK

0.7 MI. RTE.25, Carroll, NH

Built 1900 Load: 17.6 t ADT: 41

COAKLEY ROAD

Poor

Over: HODGSON BROOK

1 MI. WEST OF BYPASS 1, Rockingham, NH

Built 1940 Load: 18.0 t ADT: 469

EAST THETFORD ROAD

Poor

Over: CONNECTICUT RIVER

0.1 MI FROM VERMONT SL, Grafton, NH

Built 1937 Load: 18.1 t ADT: 2,118

US 3

Poor

Over: SOUHEGAN RIVER

0.03 MI FROM RAILROAD AVE, Hillsborough, NH

Built 1921 Load: 18.1 t ADT: 12,781

HILL ROAD

Poor

Over: DARBY BROOK

.08 MI FR DINSMORE HILL, Cheshire, NH

Built 1970 Load: 18.4 t ADT: 90

NH125

Poor

Over: ISINGLASS RIVER

.1 MI BARRINGTON T.L., Strafford, NH

Built 1951 Load: 18.4 t ADT: 14,083

FDR 35

Poor

Over: DOUGLAS BROOK

MAP 32, Carroll, NH

Built 1950 Load: 18.8 t ADT: 50

NH 25

Poor

Over: OLIVERIAN BROOK

1.0 MI HAVERHILL T.L., Grafton, NH

Built 1960 Load: 19.1 t ADT: 1,051

US202 NH 9

Poor

Over: ASH BROOK

1 MI FROM CURRIER RD, Merrimack, NH

Built 1970 Load: 19.6 t ADT: 2,807

WINDY ROW ROAD

Poor

Over: MCDOWELL RESERVOIR

0.6 MI FR PETERBORO TL, Hillsborough, NH

Built 1950 Load: 19.6 t ADT: 243

NH112 KANCAMAGUS

Poor

Over: PEMIGEWASSET RIVER

0.1 MI E JCT ROUTE 3, Grafton, NH

Built 1933 Load: 19.8 t ADT: 6,813

OLD NH 16

Poor

Over: THOMPSON BROOK

0.2 MI EAST JCT NH 16, Coos, NH

Built 1931 Load: 20.0 t ADT: 5

REC AREA ACCESS RD

Poor

Over: OTTER BROOK

8.05 KM N OF KEENE, Cheshire, NH

Built 1967 Load: 20.1 t ADT: 50

REC AREA ACCESS RD

Poor

Over: OTTER BROOK

8.05 KM N OF KEENE, Cheshire, NH

Built 1967 Load: 20.1 t ADT: 50

US202 NH101

Poor

Over: CONTOOCOOK RIVER

2.5 MI. W. DUBLIN TL, Hillsborough, NH

Built 1958 Load: 20.4 t ADT: 18,347

NH 12

Poor

Over: MILL BROOK

4.3 MI TO WALPOLE TL, Cheshire, NH

Built 1941 Load: 20.4 t ADT: 6,382

BRIDGE ROAD

Poor

Over: BLACKWATER RIVER

0.1 MI S NH 11, Merrimack, NH

Built 1882 Load: 20.9 t ADT: 90

NH 1A

Poor

Over: HAMPTON RIVER

0.1 MI FROM SEABROOK TL, Rockingham, NH

Built 1949 Load: 20.9 t ADT: 9,293

COCHECO ROAD

Poor

Over: COCHECO RIVER

0.15MI. RTE 75, Strafford, NH

Built 1953 Load: 21.0 t ADT: 1,747

FDR 29

Poor

Over: WALKER BROOK

MAP 29, Grafton, NH

Built 1975 Load: 21.1 t ADT: 50

EASTSIDE ROAD

Poor

Over: MARTINS BROOK

0.77MI WARREN TL, Grafton, NH

Built 1940 Load: 21.6 t ADT: 215

NH 13

Poor

Over: SOUHEGAN RIVER

0.1 MI FROM MAPLE ST, Hillsborough, NH

Built 1931 Load: 22.0 t ADT: 12,511

Showing 2,401-2,450 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.