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

US 2

Poor

Over: PEA BROOK

0.8 MI FROM GORHAM TL, Coos, NH

Built 1932 Load: 22.0 t ADT: 4,291

FDR 12

Poor

Over: BURNT MILL BROOK

MAP 14, Coos, NH

Built 1947 Load: 22.4 t ADT: 50

JACK WELLS ROAD

Poor

Over: FRAZIER BROOK

0.1 MI FR WILMOT T/L, Merrimack, NH

Built 1950 Load: 22.5 t ADT: 72

NORTH ROAD

Poor

Over: ANDROSCOGGIN RIVER

0.32 MI N JCT US 2, Coos, NH

Built 1900 Load: 22.5 t ADT: 278

FEE TPK SB

Poor

Over: PENNICHUCK BROOK

NASHUA-MERRIMACK T.L., Hillsborough, NH

Built 1954 Load: 22.7 t ADT: 43,368

US 1

Poor

Over: CSX

1.1MI FROM RYE TL, Rockingham, NH

Built 1935 Load: 22.9 t ADT: 15,098

BOG ROAD

Poor

Over: CONNECTICUT RIVER

0.02 MILE EAST OF VT. S L, Coos, NH

Built 1893 Load: 22.9 t ADT: 300

US 3 NH 3A

Poor

Over: I-293 NH 3A CSX MERR R

0.7 MI BEDFORD TL, Hillsborough, NH

Built 1923 Load: 23.0 t ADT: 23,677

US 1

Poor

Over: CSX(ABD)

0.1 MI FROM N HAMPTON TL, Rockingham, NH

Built 1936 Load: 23.2 t ADT: 16,112

COLE HILL ROAD

Poor

Over: FOWLER RIVER

0.5 MI FROM SHIN VALLEY, Grafton, NH

Built 1930 Load: 23.3 t ADT: 90

NH 49

Poor

Over: PEMIGEWASSET RIVER

0.25 MI E JCT US 3, Grafton, NH

Built 1928 Load: 23.5 t ADT: 1,968

CHESHAM ROAD

Poor

Over: MINNEWAWA BROOK

0.3 MI FR DUBLIN TL, Cheshire, NH

Built 1939 Load: 23.9 t ADT: 1,549

LIBERTY FARM ROAD

Poor

Over: NORTH BRANCH RIVER

0.13MI. NH9, Hillsborough, NH

Built 1991 Load: 24.0 t ADT: 90

NUTTING ROAD

Poor

Over: CONTOOCOOK RIVER

0.4 MI FR CROSS ST, Cheshire, NH

Built 1905 Load: 24.1 t ADT: 1,777

US 3

Poor

Over: BABOOSIC BROOK

5.9 MI N NASHUA TL, Hillsborough, NH

Built 1933 Load: 24.1 t ADT: 14,709

FDR 17

Poor

Over: BURNT KNOLL

MAP 24, Carroll, NH

Built 1975 Load: 24.3 t ADT: 100

DRAKE HILL ROAD

Poor

Over: MEADOW BROOK

SE NH 16, Carroll, NH

Built 1930 Load: 24.5 t ADT: 107

NH142

Poor

Over: AMMONOOSUC RIVER

2.2 MI FROM WHITEFIELD TL, Grafton, NH

Built 1927 Load: 24.5 t ADT: 1,214

NH 3A

Poor

Over: NEWFOUND RIVER

2.0 MI. FROM HILL T.L., Grafton, NH

Built 1949 Load: 24.5 t ADT: 3,364

I-393 US 4 US202

Poor

Over: FORT EDDY RD

0.2MI E JCT I-93, Merrimack, NH

Built 1980 Load: 24.5 t ADT: 39,922

US 4

Poor

Over: SMITH RIVER

4.6 MI FROM WILMOT TL, Merrimack, NH

Built 1929 Load: 24.5 t ADT: 2,046

TUNNEL BROOK ROAD

Poor

Over: WILD AMMONOOSUC RIVER

0.6 MI N. BENTON T.L., Grafton, NH

Built 1900 Load: 24.5 t ADT: 57

NH119

Poor

Over: CONNECTICUT RIVER

AT VERMONT STATE LINE, Cheshire, NH

Built 1920 Load: 24.5 t ADT: 8,409

DORCHESTER ROAD

Poor

Over: GRANT BROOK

2.1 MI FROM JCT RTE 10, Grafton, NH

Built 1952 Load: 24.5 t ADT: 1,110

US202 NH123

Poor

Over: CONTOOCOOK RIVER

2.2 MI TO GREENFIELD TL, Hillsborough, NH

Built 1942 Load: 24.5 t ADT: 6,878

SCOTLAND ROAD

Poor

Over: ROARING BROOK

0.23MI NH119, Cheshire, NH

Built 1955 Load: 24.5 t ADT: 598

MAPLEWOOD AVENUE

Poor

Over: NORTH MILL POND

0.2 MI E JCT US 1 BYPASS, Rockingham, NH

Built 1940 Load: 25.0 t ADT: 6,472

I-293 NH 3A TPK S

Poor

Over: BLACK BROOK

2.5MI S HOOKSETT T.L., Hillsborough, NH

Built 1956 Load: 25.3 t ADT: 21,510

I-293 NH 3A TPK N

Poor

Over: BLACK BROOK

2.5 S HOOKSETT TL, Hillsborough, NH

Built 1956 Load: 25.3 t ADT: 23,559

NH 25A

Poor

Over: BAKER POND BROOK

10.2 MI FROM VERMONT SL, Grafton, NH

Built 1929 Load: 25.3 t ADT: 805

SHEEPBORO ROAD

Poor

Over: BERRYS RIVER

1.22 MI ROCHESTER TL, Strafford, NH

Built 1983 Load: 25.8 t ADT: 20

HILL ROAD

Poor

Over: PERRY STREAM

0.2 MI FROM US RTE 3, Coos, NH

Built 1860 Load: 25.8 t ADT: 220

NH 3A

Poor

Over: NEWFOUND RIVER

1.2 MI N OF JCT RTE 104, Grafton, NH

Built 1924 Load: 25.9 t ADT: 6,806

US 3

Poor

Over: LOST RIVER

5.6 MI FROM THORNTON TL, Grafton, NH

Built 1931 Load: 26.3 t ADT: 2,669

NH 16 SP TPK SB

Poor

Over: NH108 CSX(ABD)

0.2 MI FROM JCT. RT 16, Strafford, NH

Built 1957 Load: 26.5 t ADT: 20,752

NH 16 SP TPK NB

Poor

Over: NH108 CSX(ABD)

0.2 MI FROM JCT. RTE 16, Strafford, NH

Built 1957 Load: 26.5 t ADT: 21,665

NH 11B

Poor

Over: GUNSTOCK RIVER

0.6 MI N JCT NH 11-A, Belknap, NH

Built 1941 Load: 26.5 t ADT: 2,650

NH103

Poor

Over: I-89 SB WARNER RIVER

3.6 MI N HOPKINTON T.L., Merrimack, NH

Built 1966 Load: 26.9 t ADT: 1,345

NH101

Poor

Over: OTTER BROOK

1.5 MI FROM MARLBORO TL, Cheshire, NH

Built 1933 Load: 27.3 t ADT: 11,367

NH 12A

Poor

Over: NHRR

100 FT FROM JCT RTE 10, Grafton, NH

Built 1949 Load: 27.9 t ADT: 8,338

NH118

Poor

Over: INDIAN RIVER

2.3 MI FROM DORCHESTER TL, Grafton, NH

Built 1948 Load: 28.1 t ADT: 1,408

NH 16 SP TPK SB

Poor

Over: COCHECO RIVER

3.6 MI. FROM ROCHESTER TL, Strafford, NH

Built 1957 Load: 28.4 t ADT: 23,076

NH 16 SP TPK NB

Poor

Over: COCHECO RIVER

3.6 MI FROM ROCHESTER TL., Strafford, NH

Built 1957 Load: 28.4 t ADT: 22,053

NH111A

Poor

Over: EXETER RIVER

0.6 MI DANVILLE T.L., Rockingham, NH

Built 1978 Load: 28.8 t ADT: 3,186

ANTRIM ROAD

Poor

Over: MONADNOCK MILL CANAL

0.39 MI FR CONTOOCOOK VA, Hillsborough, NH

Built 1922 Load: 28.9 t ADT: 2,291

NH175

Poor

Over: PEMIGEWASSET RIVER

0.6 MI EAST JCT US 3, Grafton, NH

Built 1976 Load: 28.9 t ADT: 672

RIVER ROAD SOUTH

Poor

Over: PARTRIDGE BROOK

0.72 MI NH63, Cheshire, NH

Built 1937 Load: 29.2 t ADT: 1,214

US 3

Poor

Over: BOG BROOK

1.2 MI FROM PLYMOUTH TL, Grafton, NH

Built 1929 Load: 29.4 t ADT: 1,326

US 4

Poor

Over: BLACKWATER RIVER

0.3 MI FROM SALISBURY TL, Merrimack, NH

Built 1933 Load: 29.8 t ADT: 2,600

NH 32

Poor

Over: MARTIN BROOK

1.48 MI. N. RICHMOND TL, Cheshire, NH

Built 1929 Load: 30.0 t ADT: 2,912

Showing 2,451-2,500 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.