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

NH 16 SP TPK

Good

Over: NH 75

2.1 MI N OF ROCHESTER TL, Strafford, NH

Built 1980 Load: 32.5 t ADT: 14,303

I-93 SB

Good

Over: PEMIGEWASSET RIVER

HOLDERNESS-PLYMOUTH TL, Grafton, NH

Built 1964 Load: 32.5 t ADT: 11,400

ECHO VALLEY ROAD

Good

Over: COLD RIVER

161 FT FR NH RTE 123A, Sullivan, NH

Built 2006 Load: 32.7 t ADT: 90

FERNCROFT ROAD

Good

Over: WONALANCET BROOK

.1 M N OF 113A, Carroll, NH

Built 1973 Load: 32.7 t ADT: 90

DRAKE HILL ROAD

Good

Over: CHOCORUA RIVER

0.1 MI E NH16, Carroll, NH

Built 1986 Load: 32.7 t ADT: 110

MERRIMACK ROAD

Good

Over: BEAVER BROOK

0.5 MI NH 101, Hillsborough, NH

Built 1986 Load: 32.7 t ADT: 1,823

US 4 NH 11

Good

Over: RAGGED MOUNTAIN BROOK

1.9 MI FROM WILMOT T.L., Merrimack, NH

Built 1959 Load: 32.7 t ADT: 5,050

WINDSOR DRIVE

Good

Over: COHAS BROOK

0.10 MI. WILSON CROSSING, Rockingham, NH

Built 2002 Load: 32.7 t ADT: 187

NH 28

Good

Over: BEAUTY HILL ROAD

1.3 MI FR PITTSFIELD T.L., Belknap, NH

Built 1969 Load: 32.7 t ADT: 10,365

WHITE OAKS ROAD

Good

Over: SUNCOOK RIVER

0.3 MI FR GILMANTON TL, Belknap, NH

Built 1986 Load: 32.7 t ADT: 1,214

STATION ROAD

Good

Over: CHANDLER BROOK

0.3 MI TO JCT US 3, Hillsborough, NH

Built 2007 Load: 32.7 t ADT: 538

SOUTH ROAD

Good

Over: WHICHIER BROOK

6.7 MI FROM LACONIA TL, Belknap, NH

Built 1984 Load: 32.7 t ADT: 859

HAIGH ROAD

Good

Over: EXETER RIVER

.4 MI FROM RT 111-A, Rockingham, NH

Built 1979 Load: 32.7 t ADT: 593

NH109

Good

Over: PIKE BROOK

0.3 MI JCT RT 16, Carroll, NH

Built 1974 Load: 32.7 t ADT: 2,028

SOUTH MAIN STREET

Good

Over: NISSITISSIT RIVER

1.45 MI N MASS SL, Hillsborough, NH

Built 1931 Load: 32.7 t ADT: 3,537

US 4

Good

Over: MASCOMA RIVER

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

Built 1965 Load: 32.7 t ADT: 7,483

NH101 EB

Good

Over: CHESTER ROAD

2.8MI E OF AUBURN TL, Rockingham, NH

Built 1981 Load: 32.7 t ADT: 20,429

NH101 WB

Good

Over: CHESTER ROAD

2.8MI E OF AUBURN TL, Rockingham, NH

Built 1981 Load: 32.7 t ADT: 20,154

NEW BOSTON ROAD

Good

Over: NORTH BRANCH RIVER

2.7 MI FROM RAYMOND TL, Rockingham, NH

Built 1985 Load: 32.7 t ADT: 558

DEWING ROAD

Good

Over: WEEKS BROOK

0.3MI FR CONWAY TL, Carroll, NH

Built 1969 Load: 32.7 t ADT: 90

STRAND ROAD

Good

Over: RED WATER BROOK

TOWN RD, Sullivan, NH

Built 1991 Load: 32.7 t ADT: 90

BUNGY ROAD

Good

Over: MOHAWK RIVER

0.01 MI S JCT NH 26, Coos, NH

Built 1977 Load: 32.7 t ADT: 308

US 3 VILLAGE ST

Good

Over: CONTOOCOOK RIVER

0.1 MI S OF BOSCAWEN TL, Merrimack, NH

Built 1984 Load: 32.7 t ADT: 4,705

MILL VILLAGE ROAD

Good

Over: MILL BROOK

0.03 MI FR STAGE ROAD, Sullivan, NH

Built 1969 Load: 32.7 t ADT: 124

CROYDON BROOK ROAD

Good

Over: BEAVER BROOK

0.5 MI NEWPORT TL, Sullivan, NH

Built 1974 Load: 32.7 t ADT: 175

NOTTINGHAM ROAD

Good

Over: LAMPREY RIVER

0.15 MI. RTE 107, Rockingham, NH

Built 1978 Load: 32.7 t ADT: 978

EAST DERRY ROAD

Good

Over: BEAVER BROOK

0.02 MI E JCT BYP 28, Rockingham, NH

Built 1966 Load: 32.7 t ADT: 10,374

BICKFORD WOODS RD

Good

Over: ROCKY BROOK

0.02 MI WENTWORTH TL, Grafton, NH

Built 1973 Load: 32.7 t ADT: 70

WATSON ROAD

Good

Over: COCHECO RIVER

2.8 MI FROM BARRINGTON T, Strafford, NH

Built 1986 Load: 32.7 t ADT: 2,836

FOURTH STREET

Good

Over: COCHECO RIVER

DOWNTOWN DOVER, Strafford, NH

Built 1978 Load: 32.7 t ADT: 2,140

NH 9 NH108 SB

Good

Over: COCHECO RIVER

0.1 MI JCT NH 4, Strafford, NH

Built 1976 Load: 32.7 t ADT: 5,893

NH 9 NH108 NB

Good

Over: COCHECO RIVER

NB 16 & EB 4, Strafford, NH

Built 1977 Load: 32.7 t ADT: 13,770

BAGDAD ROAD

Good

Over: US 4

.4 MI. FROM JCT. NH 108, Strafford, NH

Built 1966 Load: 32.7 t ADT: 1,712

PLEASANT POND ROAD

Good

Over: COLLINS BROOK

1.53 MI. RTE 47, Hillsborough, NH

Built 2010 Load: 32.7 t ADT: 157

NH117

Good

Over: GALE RIVER

0.2 MI E LISBON TL, Grafton, NH

Built 1974 Load: 32.7 t ADT: 1,701

POLLARD ROAD

Good

Over: BLACK BROOK

TOWN ROAD, Hillsborough, NH

Built 2008 Load: 32.7 t ADT: 538

TURNPIKE ROAD

Good

Over: MILL BROOK

1.32 MI. RTE 4, Grafton, NH

Built 1985 Load: 32.7 t ADT: 140

NH 25

Good

Over: OLIVERIAN BROOK

1.5 MI W BENTON TL, Grafton, NH

Built 1975 Load: 32.7 t ADT: 977

US202

Good

Over: N BRANCH RIVER

0.5 MI FROM ANTRIM TL, Hillsborough, NH

Built 1988 Load: 32.7 t ADT: 6,450

US 3 NH 25

Good

Over: SQUAM RIVER

4.0 MI FR CENTER HARBOR T, Grafton, NH

Built 1976 Load: 32.7 t ADT: 3,438

I-93 SB

Good

Over: US 3 NH 28

0.2 MI MANCHESTER TL, Merrimack, NH

Built 1976 Load: 32.7 t ADT: 33,486

I-93 NB

Good

Over: US 3 NH 28

0.2 MI MANCHESTER TL, Merrimack, NH

Built 1976 Load: 32.7 t ADT: 33,556

NH115

Good

Over: CHERRY MILL BROOK

2.9 MI SW JCT US RT 2, Coos, NH

Built 1984 Load: 32.7 t ADT: 3,637

BOWMAN DRIVE

Good

Over: BLACK BROOK

450 FT N NH 12, Cheshire, NH

Built 1997 Load: 32.7 t ADT: 480

WEST STREET

Good

Over: ASH SWAMP BROOK

1.9 MI W.FROM KEENE CTR, Cheshire, NH

Built 1990 Load: 32.7 t ADT: 2,270

NH106

Good

Over: US 3 NH 11

.4 MI BELMONT TL, Belknap, NH

Built 1964 Load: 32.7 t ADT: 11,448

US 4

Good

Over: CONNECTICUT RIVER

0.1 MI FROM VERMONT SL, Grafton, NH

Built 2015 Load: 32.7 t ADT: 11,549

US 4

Good

Over: REC TRAIL MASCOMA RIVER

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

Built 2015 Load: 32.7 t ADT: 10,800

KEYES HOLLOW ROAD

Good

Over: COLD RIVER

1.5 MI. TL ACWORTH, Sullivan, NH

Built 2014 Load: 32.7 t ADT: 90

NH117

Good

Over: SALMON HOLE BROOK

1.0 MI E. JCT. RT. 302, Grafton, NH

Built 1969 Load: 32.7 t ADT: 871

Showing 1,251-1,300 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.