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

LOVEREN MILL RD

Good

Over: NORTH BRANCH RIVER

185 FT RTE 9, Hillsborough, NH

Built 1992 Load: 40.8 t ADT: 90

TOM BERRY ROAD

Good

Over: BIG RIVER

0.56 MI FR STRAFFORD TL, Belknap, NH

Built 1930 Load: 40.8 t ADT: 90

US302

Good

Over: NHRR(CONWAY SCENIC LINE)

2.1 MI SW JCT NH 16, Carroll, NH

Built 2008 Load: 40.8 t ADT: 5,300

US302

Good

Over: SACO RIVER

1.7 MI SW OF RTE 16, Carroll, NH

Built 2008 Load: 40.8 t ADT: 5,300

US302 NH 10

Good

Over: NHRR(ABD)

1.6 MI. FROM HAVERHILL TL, Grafton, NH

Built 1990 Load: 40.8 t ADT: 4,815

SOUTH ROAD

Good

Over: BELMONT RIVER

6.2 MI FROM LACONIA TL, Belknap, NH

Built 1988 Load: 40.8 t ADT: 859

DUNKLEE ROAD

Good

Over: BOW BOG BROOK

0.16 MI FROM RTE 3-A, Merrimack, NH

Built 2006 Load: 40.8 t ADT: 2,123

I-93 NB

Good

Over: OWL STREET

0.7 MI THORNTON TL, Grafton, NH

Built 1968 Load: 40.8 t ADT: 7,387

I-93 NB

Good

Over: NH 49

1.4MI FROM THORNTON TL, Grafton, NH

Built 1968 Load: 40.8 t ADT: 7,387

NH 12A

Good

Over: NECRR

0.4 MI EAST ROUTE 12, Sullivan, NH

Built 2000 Load: 40.8 t ADT: 1,438

JOSIE ROAD

Good

Over: MOHAWK RIVER

2.8 MI FROM DIXVILLE TL, Coos, NH

Built 1986 Load: 40.8 t ADT: 90

WASHINGTON STREET

Good

Over: MILL OUTLET

0.4MI. US3, Merrimack, NH

Built 1988 Load: 40.8 t ADT: 2,781

ISLAND ROAD

Good

Over: CANAL INLET

185 FT FROM FISKE RD, Merrimack, NH

Built 1988 Load: 40.8 t ADT: 96

NH 16 SP TPK SB

Good

Over: BMRR

.4 MI. FROM JCT. RT 9, Strafford, NH

Built 1957 Load: 40.8 t ADT: 23,076

NH108

Good

Over: OYSTER RIVER

.2 MI FR JCT. RTE. 4, Strafford, NH

Built 1991 Load: 40.8 t ADT: 11,709

BEEDE ROAD

Good

Over: NH101

Junction Beede Rd &NH101, Rockingham, NH

Built 1998 Load: 40.8 t ADT: 504

HOUNSELL AVENUE

Good

Over: JEWETT BROOK

0.1 MI SOUTH NH11A, Belknap, NH

Built 2005 Load: 40.8 t ADT: 480

US 2 NH 16

Good

Over: MOOSE RIVER

5.1 MI FROM MARTINS LOC., Coos, NH

Built 1939 Load: 40.8 t ADT: 10,303

PRESCOTT HILL ROAD

Good

Over: SMITH RIVER

0.09 MI. RTE 4, Grafton, NH

Built 1997 Load: 40.8 t ADT: 605

MILLBROOK ROAD

Good

Over: MILL BROOK

2.11 MI. ORANGE TL, Grafton, NH

Built 1991 Load: 40.8 t ADT: 90

TANNERY HILL ROAD

Good

Over: FERGUSON BROOK

0.5 MI FROM MIDDLE ROAD, Hillsborough, NH

Built 2002 Load: 40.8 t ADT: 223

CLARK POND ROAD

Good

Over: CLARK BROOK

500 S. OF WOODWARD RD, Grafton, NH

Built 2020 Load: 40.8 t ADT: 90

CONCORD ROAD

Good

Over: AMEY BROOK

2.2 MI FR HOPKINTON TL, Merrimack, NH

Built 1938 Load: 40.8 t ADT: 1,955

US202 NH 9

Good

Over: HENNIKER ST

0.8MI W HENNIKER T/L, Hillsborough, NH

Built 2002 Load: 40.8 t ADT: 10,127

HADLEY ROAD

Good

Over: CONTOOCOOK RIVER

at Pierce Crossing Bridge, Cheshire, NH

Built 2003 Load: 40.8 t ADT: 90

TRUES BROOK ROAD

Good

Over: BLOODS BROOK

0.9 MI FR PLAINFIELD TL, Grafton, NH

Built 2008 Load: 40.8 t ADT: 1,068

US 4

Good

Over: NH155

1.0 MI FROM JCT RT 155A, Strafford, NH

Built 1968 Load: 40.8 t ADT: 13,086

BEACON STREET

Good

Over: AMMONOOSUC RIVER

0.03 MI FROM NH RTE 116, Grafton, NH

Built 2000 Load: 40.8 t ADT: 306

I-93 SB

Good

Over: RECREATION TRAIL

1.5 MI S MANCHESTER LINE, Rockingham, NH

Built 2013 Load: 40.8 t ADT: 39,949

I-93 NB

Good

Over: RECREATION TRAIL

1.5 M S MANCHETER CL, Rockingham, NH

Built 2014 Load: 40.8 t ADT: 35,850

I-93 SB

Good

Over: NH 28

1.7 MI S MANCHESTER CL, Rockingham, NH

Built 2013 Load: 40.8 t ADT: 39,949

I-93 NB

Good

Over: NH 28

1.7 MI S MANCHESTER TL, Rockingham, NH

Built 2014 Load: 40.8 t ADT: 35,850

MOUNTAIN MEADOWS R

Good

Over: OGONTZ BROOK

0.12 MI FR LISBON TL, Grafton, NH

Built 2017 Load: 40.8 t ADT: 90

NH 10

Good

Over: HEWES BROOK

0.5 MI FROM HANOVER TL, Grafton, NH

Built 1966 Load: 40.8 t ADT: 2,281

NH 10

Good

Over: GRANT BROOK

3.1 MI FROM HANOVER TL, Grafton, NH

Built 1958 Load: 40.8 t ADT: 2,837

KELLEY STREET

Good

Over: PISCATAQUOG R CSX RD

0.3 MI E JCT RTE 114-A, Hillsborough, NH

Built 1973 Load: 40.8 t ADT: 11,101

I-93 SB

Good

Over: I-93 NB OFF RAMP

1.5 MI E JCT RT 28, Hillsborough, NH

Built 1962 Load: 40.8 t ADT: 25,680

I-293 EB NH101

Good

Over: NH 3A BROWN AVE

1.2MI W. JCT RTE 28, Hillsborough, NH

Built 2004 Load: 40.8 t ADT: 40,972

NEW SEARLES ROAD

Good

Over: SALMON BROOK

0.2 MI W OF E DUNSTABLE, Hillsborough, NH

Built 1999 Load: 40.8 t ADT: 2,003

CIRCUMFERENTIAL EB

Good

Over: MERRIMACK RIVER CSX

NASHUA-HUDSON TL, Hillsborough, NH

Built 2000 Load: 40.8 t ADT: 42,986

GOOSE HOLE ROAD

Good

Over: BROOK

0.36 MI. SPRINGFIELD TL, Merrimack, NH

Built 1930 Load: 40.8 t ADT: 90

TWIN BRIDGE ROAD

Good

Over: WHICHIER BROOK

40 FT FR BELMONT TL, Merrimack, NH

Built 1998 Load: 40.8 t ADT: 90

NH 1A

Good

Over: LITTLE RIVER

50 FEET SOUTH NH111, Rockingham, NH

Built 2000 Load: 40.8 t ADT: 4,214

US 3

Good

Over: UPPER AMMONOOSUC RIVER

4.4 MI FROM LANCASTER TL, Coos, NH

Built 1995 Load: 40.8 t ADT: 5,358

NH152

Good

Over: NORTH RIVER

.45MI. SE NORTHWOOD TL, Rockingham, NH

Built 1994 Load: 40.8 t ADT: 2,664

GRANITE ROAD

Good

Over: PINE RIVER

0.5 MI E JCT RTE 16, Carroll, NH

Built 2004 Load: 40.8 t ADT: 90

CASTLE HILL ROAD

Good

Over: BEAVER BROOK

WINDHAM TL, Hillsborough, NH

Built 2009 Load: 40.8 t ADT: 273

NH107

Good

Over: SUNCOOK RIVER

5.4 MI FROM NORTHWOOD TL, Merrimack, NH

Built 1997 Load: 40.8 t ADT: 2,858

DANIELS ROAD

Good

Over: BLOW-ME-DOWN BROOK

0.4 MI FROM NH RTE 12A, Sullivan, NH

Built 2002 Load: 40.8 t ADT: 273

BLUEBERRY HILL RD

Good

Over: EXETER RIVER

0.19 MI FROM NH RTE 102, Rockingham, NH

Built 1987 Load: 40.8 t ADT: 728

Showing 1,501-1,550 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.