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

US202 NH123

Fair

Over: FERGUSON BROOK

.07 MI. FROM PETERBORO TL, Hillsborough, NH

Built 1959 Load: 35.7 t ADT: 5,007

US202 NH 11

Fair

Over: NHNCRR

.5 MI E OF SPAULDING TPK, Strafford, NH

Built 1957 Load: 35.7 t ADT: 16,131

NH 25 NH113

Fair

Over: COLD BROOK

1.9 MI FROM SANDWICH T.L., Carroll, NH

Built 1938 Load: 35.7 t ADT: 4,973

I-93 SB

Fair

Over: US302 NH 10 NH 18 NH116

0.03 MI LITTLETON TL, Grafton, NH

Built 1959 Load: 36.1 t ADT: 4,228

NH 16

Fair

Over: MOOSE BROOK

3.8 MI BERLIN TL, Coos, NH

Built 1972 Load: 36.1 t ADT: 10,136

BOSTON POST ROAD

Fair

Over: BEAVER BROOK

.06 MI FR NH RTE 122, Hillsborough, NH

Built 1984 Load: 36.3 t ADT: 3,484

GARRISON LANE

Fair

Over: LITTLE RIVER

0.6MI RTE 111A, Rockingham, NH

Built 1930 Load: 36.3 t ADT: 13

NH110

Fair

Over: ROARING BROOK

2.4 MI FROM STARK TL, Coos, NH

Built 1962 Load: 36.3 t ADT: 2,271

GILMAN VALLEY ROAD

Fair

Over: STONY BROOK

0.3 MI. OSSIPEE TL, Carroll, NH

Built 1930 Load: 36.3 t ADT: 90

BOG ROAD

Fair

Over: PATTEN BROOK

0.5MI S ALEXANDRIA CTR, Grafton, NH

Built 1950 Load: 36.4 t ADT: 90

I-93 FEE TPK

Fair

Over: DOW ROAD

1.7 MI JCT I-89, Merrimack, NH

Built 1957 Load: 36.4 t ADT: 75,591

FRENCH ROAD

Fair

Over: JOHNS RIVER

2.9 MI NH 135, Coos, NH

Built 1948 Load: 36.4 t ADT: 207

NH 45

Fair

Over: SOUHEGAN RIVER

3.21 MI. N.OF MASON TL, Hillsborough, NH

Built 1937 Load: 36.6 t ADT: 2,660

NH 33

Fair

Over: WINNICUT RIVER

1.4 MI FROM STRATHAM TL, Rockingham, NH

Built 1959 Load: 36.7 t ADT: 19,151

BALL PARK ROAD

Fair

Over: TROW BROOK

0.09MI. LEMPSTER TL, Sullivan, NH

Built 1930 Load: 36.9 t ADT: 90

US302

Fair

Over: SACO RIVER

2.4 MI E JCT 16, Carroll, NH

Built 1972 Load: 37.1 t ADT: 13,181

NH 27

Fair

Over: NORTH BRANCH RIVER

.2 MI FROM RAYMOND TL, Rockingham, NH

Built 1932 Load: 37.2 t ADT: 3,419

US 1 NB RAMP

Fair

Over: NHRR(ABD)

.1 MI FROM JCT. RT 1, Rockingham, NH

Built 1963 Load: 37.2 t ADT: 10,526

MASON STREET

Fair

Over: CANAL

610FT WEST OF UNITY ST, Coos, NH

Built 1967 Load: 37.4 t ADT: 5,273

BRANCH ROAD

Fair

Over: MINNEWAWA RIVER

0.02 MI N JCT NH10, Cheshire, NH

Built 1938 Load: 37.4 t ADT: 1,004

NH120

Fair

Over: MASCOMA RIVER

0.7 MI FROM JCT I-89, Grafton, NH

Built 1969 Load: 37.4 t ADT: 7,709

CENTRE ST

Fair

Over: OTTER BROOK

4.46 MI GILSUM TL., Cheshire, NH

Built 1981 Load: 37.4 t ADT: 631

I-95 RAMPS

Fair

Over: HODGSON BROOK

SP TPK I-95 INTERCHANGE, Rockingham, NH

Built 1956 Load: 37.7 t ADT: 15,259

US 4

Fair

Over: STONY BROOK

2.8 MI. FROM ENFIELD T.L., Grafton, NH

Built 1966 Load: 37.9 t ADT: 12,195

NH123A

Fair

Over: WEST BR SOUHEGAN RIVER

1.78 MI N MASS SL, Hillsborough, NH

Built 1936 Load: 37.9 t ADT: 1,250

NH116

Fair

Over: WILD AMMONOOSUC RIVER

.02 MI S JCT. 112, Grafton, NH

Built 1927 Load: 38.1 t ADT: 865

DAME HILL ROAD

Fair

Over: JACOBS BROOK

100 FT E. OF JCT NH 25-A, Grafton, NH

Built 1947 Load: 38.1 t ADT: 251

FDR 13

Fair

Over: UPPER AMMONOOSUC RIVER

MAP 02, Coos, NH

Built 1947 Load: 38.2 t ADT: 50

MASON STREET

Fair

Over: ANDROSCOGGIN RIVER

350FT WEST OF UNITY ST, Coos, NH

Built 1967 Load: 38.4 t ADT: 5,273

HUNTRESS BRIDGE RD

Fair

Over: OSSIPEE RIVER

FREEDOM TL, Carroll, NH

Built 1936 Load: 38.4 t ADT: 180

CAMP ROAD

Fair

Over: NEWTON BROOK

1.3 MI FROM CORNISH TL, Sullivan, NH

Built 2018 Load: 38.4 t ADT: 90

EAST DUNBARTON RD

Fair

Over: BLACK BROOK

TOWN RD, Hillsborough, NH

Built 1994 Load: 38.6 t ADT: 1,555

I-89 SB

Fair

Over: STOCKER BROOK

.81 MI SPRINGFIELD TL, Sullivan, NH

Built 1967 Load: 38.6 t ADT: 9,549

PODUNK ROAD

Fair

Over: BEAR BROOK

BEAR BROOK RESERVATION, Merrimack, NH

Built 1950 Load: 38.7 t ADT: 398

NH115A

Fair

Over: ISRAEL RIVER

2.4 MI SW JCT US 2, Coos, NH

Built 1973 Load: 38.7 t ADT: 819

WESTERN AVE

Fair

Over: CANAL

2.9 MI FR HILLSBOROUGH T, Merrimack, NH

Built 1929 Load: 38.8 t ADT: 90

I-293 SB NH101 EB

Fair

Over: MERRIMACK RIVER CSX

MANCHESTER TL, Hillsborough, NH

Built 1960 Load: 39.0 t ADT: 40,972

I-293 NB NH101 WB

Fair

Over: MERRIMACK RIVER CSX

MANCHESTER TL, Hillsborough, NH

Built 1960 Load: 39.0 t ADT: 43,021

NH 12A

Fair

Over: LITTLE SUGAR RIVER

0.6 MI NW JCT 12 AND 12A, Sullivan, NH

Built 1984 Load: 39.0 t ADT: 1,438

US202

Fair

Over: MOOSE BROOK

1.0 MI GREENFIELD TL, Hillsborough, NH

Built 1959 Load: 39.0 t ADT: 5,702

NH101

Fair

Over: PERRY ROAD

0.3 MI W JCT RTE 13, Hillsborough, NH

Built 1978 Load: 39.0 t ADT: 17,139

CROSS ROAD

Fair

Over: EXETER RIVER

AT BRENTWOOD TL, Rockingham, NH

Built 1930 Load: 39.2 t ADT: 1,008

NH101

Fair

Over: TOWER HILL ROAD

2.6 MI JCT RT 28, Rockingham, NH

Built 1964 Load: 39.4 t ADT: 51,214

US 1 SB

Fair

Over: NHRR(ABD)

.1 MI. FROM JCT RT 101 BY, Rockingham, NH

Built 1936 Load: 39.4 t ADT: 11,366

COOLEDGE ROAD

Fair

Over: BEARDS BROOK

3.2 MI FR NH RTE 31, Hillsborough, NH

Built 1970 Load: 39.4 t ADT: 90

US202 NH 9

Fair

Over: AMEY BROOK

.4 MI EAST JCT RT 114, Merrimack, NH

Built 1962 Load: 39.5 t ADT: 15,572

CRYSTAL LAKE ROAD

Fair

Over: SUNCOOK RIVER

0.4 MI NW JCT TOWN ROAD94, Belknap, NH

Built 1929 Load: 39.6 t ADT: 1,242

US 4

Fair

Over: MILL BROOK

1.25 MI FROM DANBURY TL, Grafton, NH

Built 1948 Load: 39.6 t ADT: 1,674

EAST PENACOOK ROAD

Fair

Over: BLACKWATER RIVER

1.4 MI FR CONCORD TL, Merrimack, NH

Built 1967 Load: 39.6 t ADT: 1,627

HENRY BRIDGE ROAD

Fair

Over: PISCATAQUOG RIVER

3.0 MI FROM BEDFORD TL, Hillsborough, NH

Built 1937 Load: 39.9 t ADT: 6,725

Showing 701-750 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.