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

HOLLOW ROAD

Fair

Over: STRATFORD BOG BROOK

0.5 MI EAST US 3, Coos, NH

Built 1924 Load: 16.3 t ADT: 34

NH175

Fair

Over: MILL BROOK

2.85 MI. N. OF CAMPTON TL, Grafton, NH

Built 1935 Load: 16.3 t ADT: 1,586

STAGE ROAD

Fair

Over: LITTLE SUGAR RIVER

0.2 MI. CHARLESTOWN TL, Sullivan, NH

Built 1980 Load: 16.3 t ADT: 90

NORTH ROAD

Fair

Over: MEADOW BROOK

2.46MI NH103, Merrimack, NH

Built 1939 Load: 16.3 t ADT: 90

BIBLE HILL LANE

Fair

Over: WARNER RIVER

0.01 MI FROM BRADFORD TL, Merrimack, NH

Built 1979 Load: 16.3 t ADT: 323

PARTRIDGE BROOK RD

Fair

Over: PARTRIDGE BROOK

1.2MI NH 63, Cheshire, NH

Built 1930 Load: 16.3 t ADT: 255

HATT ROAD

Fair

Over: PARTRIDGE BROOK

1.51 MI. NH63, Cheshire, NH

Built 1932 Load: 16.3 t ADT: 75

PINE WOODS ROAD

Fair

Over: MIREY BROOK

0.17 MI FR NH RTE119, Cheshire, NH

Built 1920 Load: 16.3 t ADT: 90

NH109

Fair

Over: WILLEY BROOK

0.8 MI Wentworth StatePrk, Carroll, NH

Built 1922 Load: 16.3 t ADT: 2,249

DANFORTH CORNERS

Fair

Over: BEARDS BROOK

120 FT FR E WASHINGTON R, Hillsborough, NH

Built 1974 Load: 16.5 t ADT: 90

KNOWLTON STREET

Fair

Over: MINNEWAWA BROOK

60 FT FR NH RTE 101, Cheshire, NH

Built 1943 Load: 16.5 t ADT: 108

OLD ROXBURY ROAD

Fair

Over: MINNEWAWA BROOK

0.2 MI. RTE.101, Cheshire, NH

Built 1932 Load: 16.5 t ADT: 484

HIGH STREET

Fair

Over: NHRR(ABD)

0.04MI RTE 12, Cheshire, NH

Built 1953 Load: 16.5 t ADT: 1,236

SOUTH RIVER ROAD

Fair

Over: HOUGHTON BROOK

0.4 MI FR WESTMORELAND T, Cheshire, NH

Built 1980 Load: 16.5 t ADT: 115

US 3

Fair

Over: LYMAN BROOK

0.7 MI NE STRATFORD TL, Coos, NH

Built 1952 Load: 16.7 t ADT: 3,114

NORTH ROAD

Fair

Over: BROOK

TOWN RD 0.80MI LYDBORO TL, Hillsborough, NH

Built 1940 Load: 16.7 t ADT: 151

US 3 NH 11

Fair

Over: US 3 NH 11

3.4 MI FROM LACONIA T.L., Belknap, NH

Built 1965 Load: 16.8 t ADT: 4,580

NH 27

Fair

Over: LAMPREY RIVER

.6 MI E CANDIA TL, Rockingham, NH

Built 1932 Load: 16.8 t ADT: 2,583

FDR 53

Fair

Over: MAD RIVER

MAP 38, Grafton, NH

Built 1957 Load: 16.8 t ADT: 50

FDR 34

Fair

Over: CARRIGAN BROOK

MAP 32, Carroll, NH

Built 1979 Load: 16.8 t ADT: 50

MELLOON ROAD

Fair

Over: WILDCAT BROOK

370 FT FR NH RTE 16B, Carroll, NH

Built 1930 Load: 17.1 t ADT: 90

WILSON ROAD

Fair

Over: GREAT BROOK

0.3 MI FR BARTLETT TL, Carroll, NH

Built 1981 Load: 17.1 t ADT: 131

NORTH SHORE ROAD

Fair

Over: GRANITE LAKE INLET

0.13 MI FROM NH RTE 9, Cheshire, NH

Built 1920 Load: 17.1 t ADT: 90

FELCH ROAD

Fair

Over: LION BROOK

0.4 MI FROM KEYSER ST, Merrimack, NH

Built 1983 Load: 17.1 t ADT: 90

HANCOCK ROAD

Fair

Over: NUBANUSIT BROOK

320 FT FR HARRISVILLE RD, Cheshire, NH

Built 1925 Load: 17.2 t ADT: 600

HANCOCK ROAD

Fair

Over: NUBANUSIT BROOK

.07 MI FR HANCOCK TL, Cheshire, NH

Built 1925 Load: 17.2 t ADT: 90

PEARL LAKE ROAD

Fair

Over: PEARL LAKE BROOK

0.7 MI FR NH RTE 112, Grafton, NH

Built 1928 Load: 17.2 t ADT: 1,214

NH 12

Fair

Over: MILL POND

1.37 MI. FITZWILLIAM TL, Cheshire, NH

Built 1928 Load: 17.2 t ADT: 7,947

CARTLAND ROAD

Fair

Over: LITTLE RIVER

1.9 MI FR NH RTE 152, Strafford, NH

Built 1957 Load: 17.3 t ADT: 160

GROVE STREET

Fair

Over: NUBANUSIT BROOK

0.4 MI FR NH RTE 123, Hillsborough, NH

Built 1936 Load: 17.3 t ADT: 4,480

MARLBORO STREET

Fair

Over: BEAVER BROOK

0.4 MI EAST JCT NH 10, Cheshire, NH

Built 1978 Load: 17.5 t ADT: 4,166

NORTH DORCHESTER R

Fair

Over: S BRANCH BAKER RIVER

0.97MI. DORCHESTER TL, Grafton, NH

Built 1949 Load: 17.5 t ADT: 141

ZACCARIA ROAD

Fair

Over: SMITH RIVER

0.15 MI SOUTH US 4, Merrimack, NH

Built 1950 Load: 17.8 t ADT: 90

NH 11

Fair

Over: WEST ALTON BROOK

1.9 MI SE GILFORD TL, Belknap, NH

Built 1923 Load: 18.0 t ADT: 5,054

HOWARD ROAD

Fair

Over: ASHUELOT RIVER

TOWN RD, Cheshire, NH

Built 1945 Load: 18.0 t ADT: 24

BRISTOL HILL ROAD

Fair

Over: NEWFOUND RIVER

0.9 MI ALEXANDRIA TL, Grafton, NH

Built 1982 Load: 18.1 t ADT: 1,497

COOLEDGE ROAD

Fair

Over: SHEDD BROOK

1.2 MI. RTE. 31, Hillsborough, NH

Built 1956 Load: 18.1 t ADT: 343

E WASHINGTON ROAD

Fair

Over: BROOK

2.0 MI. WASHINGTON TL, Hillsborough, NH

Built 1953 Load: 18.1 t ADT: 215

US202

Fair

Over: MILL TAIL RACE

1.7 MI TO PETERBORO TL, Cheshire, NH

Built 1937 Load: 18.1 t ADT: 7,296

WHITTEN ROAD

Fair

Over: TUCKER BROOK

1/4 MILE S OF SAVAGE RD, Hillsborough, NH

Built 1988 Load: 18.1 t ADT: 1,690

PURGATORY ROAD

Fair

Over: PURGATORY BROOK

0.2 MI FR LYNDEBOROUGH T, Hillsborough, NH

Built 1970 Load: 18.1 t ADT: 1,916

CEDAR ROAD

Fair

Over: CSX

0.18 MI FR LAFAYETTE RD, Rockingham, NH

Built 1920 Load: 18.1 t ADT: 2,088

MCCRILLIS ROAD

Fair

Over: NORTH RIVER

0.6 MI. RTE.152, Rockingham, NH

Built 1963 Load: 18.1 t ADT: 910

BREEZY POINT ROAD

Fair

Over: BAKER RIVER

0.01MI NH 118, Grafton, NH

Built 1930 Load: 18.1 t ADT: 162

ROADWAY

Fair

Over: ZEALAND RIVER

MAP 10, Grafton, NH

Built 1935 Load: 18.1 t ADT: 50

LUND ROAD

Fair

Over: SALMON BROOK

.1 MI W OF E DUNSTABLE RD, Hillsborough, NH

Built 1950 Load: 18.3 t ADT: 7,433

SOUTH VILLAGE ROAD

Fair

Over: SOUCOOK RIVER

2.6 MI FROM CONCORD TL, Merrimack, NH

Built 1926 Load: 18.6 t ADT: 3,594

PINKHAM B ROAD

Fair

Over: BUMPUS BROOK

0.46 MI SE JCT US 2, Coos, NH

Built 1945 Load: 18.6 t ADT: 86

OXBOW ROAD

Fair

Over: SUNCOOK RIVER

0.8 MI FR NH 28, Belknap, NH

Built 1924 Load: 18.8 t ADT: 90

TANDY BROOK ROAD

Fair

Over: MILL BROOK

2.1 MI FR CLAREMONT TL, Sullivan, NH

Built 1955 Load: 18.8 t ADT: 90

Showing 101-150 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.