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

NH101

Fair

Over: OSGOOD ROAD

1.0 MI W JCT NH 13., Hillsborough, NH

Built 1977 Load: 31.8 t ADT: 17,139

NH120

Fair

Over: BLOODS BROOK

4.2 MI FROM LEBANON TL, Sullivan, NH

Built 1934 Load: 31.8 t ADT: 2,667

NH 16 SP TPK

Fair

Over: CROSS ROAD

1.4 MI S OF MILTON TL, Strafford, NH

Built 1978 Load: 31.8 t ADT: 16,271

FOWLERS MILL ROAD

Fair

Over: PAUGUS BROOK

1.2 MI. RTE. 113A, Carroll, NH

Built 1991 Load: 31.8 t ADT: 90

I-89 NB

Fair

Over: NH103

6.3 MI FROM HOPKINTON TL, Merrimack, NH

Built 1968 Load: 31.8 t ADT: 13,375

NH 12 NH103

Fair

Over: CONNECTICUT RIVER

NH VT SL, Sullivan, NH

Built 1969 Load: 32.0 t ADT: 9,157

NH 11 NH103

Fair

Over: SUGAR RIVER

4.4 MI FROM VERMONT SL, Sullivan, NH

Built 1981 Load: 32.0 t ADT: 17,536

SOUTH RAMP

Fair

Over: I-293 FEE TPK

AT AMOSKEAG INTERCHANGE, Hillsborough, NH

Built 1957 Load: 32.0 t ADT: 11,599

NH 16 SP TPK

Fair

Over: NHNCRR

5.7 MI N OF ROCHESTER TL, Strafford, NH

Built 1980 Load: 32.0 t ADT: 14,303

NH 75

Fair

Over: NHNCRR

2.7 MI N OF FARMINGTON TL, Strafford, NH

Built 1978 Load: 32.0 t ADT: 3,653

NH202A

Fair

Over: COCHECO RIVER

1.2 MI FROM JCT RT 16, Strafford, NH

Built 1883 Load: 32.0 t ADT: 13,798

WIRE ROAD

Fair

Over: FEE TPK

0.5 MI BABOOSIC ROAD, Hillsborough, NH

Built 1954 Load: 32.1 t ADT: 4,004

I-93 NB

Fair

Over: COAL HILL RD GALE RIVER

1.9MI SUGARHILL TL, Grafton, NH

Built 1973 Load: 32.3 t ADT: 2,573

US202 NH 9

Fair

Over: CONTOOCOOK RIVER

0.2 MI EAST HENNIKER T/L, Merrimack, NH

Built 1961 Load: 32.3 t ADT: 16,732

I-93 SB

Fair

Over: PEMIGEWASSET RIVER

1.84 MI THORNTON TL, Grafton, NH

Built 1970 Load: 32.3 t ADT: 7,060

I-93 NB

Fair

Over: PEMIGEWASSET RIVER

1.84 MI THORNTON TL, Grafton, NH

Built 1970 Load: 32.3 t ADT: 6,913

MILL BROOK ROAD

Fair

Over: MILL BROOK

2.52 MI S. JCT 302, Grafton, NH

Built 1928 Load: 32.5 t ADT: 111

NH 16 SP TPK

Fair

Over: TENERIFFE ROAD

4.6 MI N OF ROCHESTER TL, Strafford, NH

Built 1980 Load: 32.5 t ADT: 14,303

I-93 NB

Fair

Over: PEMIGEWASSET RIVER

HOLDERNESS-PLYMOUTH TL, Grafton, NH

Built 1964 Load: 32.5 t ADT: 11,292

BERYL MT ROAD

Fair

Over: COLD RIVER

0.04 MI FROM RTE 123-A, Sullivan, NH

Built 1977 Load: 32.7 t ADT: 90

BROOK ROAD

Fair

Over: BROCK BROOK

0.5 MI FR SHEM VALLEY RD, Grafton, NH

Built 1930 Load: 32.7 t ADT: 74

BOSTON POST ROAD

Fair

Over: SOUHEGAN RIVER

1.9 MI MERRIMACK TL, Hillsborough, NH

Built 1977 Load: 32.7 t ADT: 4,310

NH 28

Fair

Over: SUNCOOK RIVER

3.6 MI FROM PITTSFIELD TL, Belknap, NH

Built 1957 Load: 32.7 t ADT: 8,422

RIVER STREET

Fair

Over: SACO RIVER

0.05 MI FR COBB RD, Carroll, NH

Built 1967 Load: 32.7 t ADT: 444

NH140

Fair

Over: TIOGA RIVER

2.8 MI FROM NORTHFIELD TL, Belknap, NH

Built 1965 Load: 32.7 t ADT: 7,403

NH 13

Fair

Over: NISSITISSIT RIVER

.9 MI FROM MASS. S.L., Hillsborough, NH

Built 1947 Load: 32.7 t ADT: 6,532

TRANSFER STATION R

Fair

Over: ORANGE BROOK

0.4 mi SOUTH ORANGE RD, Grafton, NH

Built 1980 Load: 32.7 t ADT: 90

NH 11

Fair

Over: CONNECTICUT RIVER

NH VT STATE LINE, Sullivan, NH

Built 1900 Load: 32.7 t ADT: 7,028

NH 11

Fair

Over: NECRR

0.7 MI. EAST VT. SL, Sullivan, NH

Built 1965 Load: 32.7 t ADT: 2,891

NH113B

Fair

Over: MCDONOUGH BROOK

7.27 MI N. CONWAY T.L., Carroll, NH

Built 1953 Load: 32.7 t ADT: 139

WEBSTER MILLS ROAD

Fair

Over: SUNCOOK RIVER

AT PITTSFIELD T/L, Merrimack, NH

Built 1981 Load: 32.7 t ADT: 1,036

RED WATER BROOK RD

Fair

Over: RED WATER BROOK

0.3 MI NH 120, Sullivan, NH

Built 1935 Load: 32.7 t ADT: 90

WHITEWATER BK RD

Fair

Over: RED WATER BROOK

0.3 MI CORNISH TL, Sullivan, NH

Built 1930 Load: 32.7 t ADT: 90

PLEASANT STREET

Fair

Over: MOHAWK RIVER

280 FEET FR US RTE 3, Coos, NH

Built 1972 Load: 32.7 t ADT: 989

HORSE HILL ROAD

Fair

Over: CONTOOCOOK RIVER

220 FEET FROM BOG RD, Merrimack, NH

Built 1981 Load: 32.7 t ADT: 2,903

NH 9

Fair

Over: SOUCOOK RIVER

PEMBROKE TL, Merrimack, NH

Built 1936 Load: 32.7 t ADT: 9,207

NH 16 NH113

Fair

Over: PEQUAWKET POND

1.2 MI FROM ALBANY TL, Carroll, NH

Built 1940 Load: 32.7 t ADT: 13,581

NH 10

Fair

Over: CROYDON BRANCH SUGAR R

0.06 MI. FROM NEWPORT TL, Sullivan, NH

Built 1973 Load: 32.7 t ADT: 3,559

BARTLETT HILL ROAD

Fair

Over: PISCATAQUOG RIVER

2.0MI WEARE TL, Hillsborough, NH

Built 1930 Load: 32.7 t ADT: 90

HEARSE HOUSE ROAD

Fair

Over: S BRANCH BAKER RIVER

1.7 MI WENTWORTH TL, Grafton, NH

Built 1970 Load: 32.7 t ADT: 90

CHESTNUT STREET

Fair

Over: COCHECO RIVER

800 FT SW JCT 4&16, Strafford, NH

Built 1975 Load: 32.7 t ADT: 12,522

MILL ROAD

Fair

Over: CSX

TOWN RD, Strafford, NH

Built 1973 Load: 32.7 t ADT: 1,348

ELM STREET

Fair

Over: PINE RIVER

1.55 MI. OSSIPEE TL, Carroll, NH

Built 1983 Load: 32.7 t ADT: 1,011

HENDERSON ROAD

Fair

Over: GUNSTOCK RIVER

0.09 MI FR INTERVALE RD, Belknap, NH

Built 1960 Load: 32.7 t ADT: 479

US 3 NH 11

Fair

Over: NH 11A

0.7 MI FROM LACONIA TL, Belknap, NH

Built 1965 Load: 32.7 t ADT: 9,365

HAMMOND HOLLOW RD

Fair

Over: ASHUELOT RIVER

TOWN RD, Cheshire, NH

Built 1981 Load: 32.7 t ADT: 135

HOWE HILL ROAD

Fair

Over: I-89

1.4 MI SPRINGFIELD TL, Sullivan, NH

Built 1967 Load: 32.7 t ADT: 94

MILL STREET

Fair

Over: SOUHEGAN RIVER

0.17 MI W JCT NH 31, Hillsborough, NH

Built 1925 Load: 32.7 t ADT: 1,020

TOWLE FARM ROAD

Fair

Over: I-95

0.8 MI HAMPTON FALLS TL, Rockingham, NH

Built 1974 Load: 32.7 t ADT: 2,192

TOWN ROAD

Fair

Over: MINK BROOK

50 FT FR HANOVER CTR RD, Grafton, NH

Built 1980 Load: 32.7 t ADT: 90

Showing 551-600 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.