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 25

Good

Over: PINE RIVER

0.6 MI FROM OLD N.H. 16, Carroll, NH

Built 1963 Load: 52.4 t ADT: 6,071

FLAT ROCK BR RD

Good

Over: SALMON FALLS RIVER

0.08MI. MAINE SL, Strafford, NH

Built 1983 Load: 52.4 t ADT: 1,617

BOG ROAD

Good

Over: STRATFORD BOG BROOK

2.5 MI. US3, Coos, NH

Built 1998 Load: 52.4 t ADT: 228

NH101 EB

Good

Over: LITTLE RIVER

.25 MI E EXETER TL, Rockingham, NH

Built 1997 Load: 52.6 t ADT: 21,071

NH101 WB

Good

Over: LITTLE RIVER

.25 MI W OF EXETER TL, Rockingham, NH

Built 1997 Load: 52.6 t ADT: 20,611

GARLAND ROAD

Good

Over: OTTER BROOK

0.03 MI FR GRANGE RD, Coos, NH

Built 1992 Load: 52.6 t ADT: 417

NH 1A

Good

Over: SAGAMORE CREEK

0.4 mi from RYE TL, Rockingham, NH

Built 2015 Load: 52.6 t ADT: 6,553

NH 1A

Good

Over: SEAVEY CREEK

1.6 MI FROM JCT RTE 1B, Rockingham, NH

Built 2009 Load: 52.6 t ADT: 1,052

OLD RICHMOND ROAD

Good

Over: S BRANCH ASHUELOT RIVER

2.41MI. RTE32, Cheshire, NH

Built 1999 Load: 52.6 t ADT: 956

US 4

Good

Over: MERRIMACK RIVER

CANTERBURY T.L., Merrimack, NH

Built 2005 Load: 52.7 t ADT: 14,848

NH 25

Good

Over: OLIVERIAN BROOK

1.4 MI FROM BENTON TL, Grafton, NH

Built 1999 Load: 52.7 t ADT: 1,051

GRANITE STREET

Good

Over: MERRIMACK RIVER

0.5 MI FROM WINTER STREET, Hillsborough, NH

Built 1981 Load: 52.7 t ADT: 25,527

OLD KEENE ROAD

Good

Over: GREAT BROOK

0.46 NNE OF NH RTE 12 JCT, Cheshire, NH

Built 2008 Load: 53.0 t ADT: 238

JONES ROAD

Good

Over: HOYT BROOK

0.4 MI NH 114, Merrimack, NH

Built 2008 Load: 53.1 t ADT: 468

LOWER MAIN STREET

Good

Over: SUGAR RIVER

0.3 MI FR NH RTE 11, Sullivan, NH

Built 1900 Load: 53.1 t ADT: 735

US302 NH113

Good

Over: CONWAY LAKE OUTLET

2.6 MI. FRYBERG ME S/L, Carroll, NH

Built 2021 Load: 53.3 t ADT: 11,517

NH102

Good

Over: I-93

0.7 MI N Derry T/L, Rockingham, NH

Built 2018 Load: 53.3 t ADT: 33,559

MILL HILL ROAD

Good

Over: DAN HOLE RIVER

146 FT FR DANA MERROW RD, Carroll, NH

Built 1940 Load: 53.3 t ADT: 22

NH 16 SP TPK RAMP

Good

Over: COCHECO R. BACKWATER

SB OFFRAMP/ COCHECO BKWTR, Strafford, NH

Built 2012 Load: 53.3 t ADT: 2,820

NH109

Good

Over: SALMON FALLS RIVER

NH-ME STATE LINE, Carroll, NH

Built 1962 Load: 53.4 t ADT: 777

I-93 NB

Good

Over: NHRR

0.3 MI THORNTON TL, Grafton, NH

Built 1970 Load: 53.5 t ADT: 7,387

I-93 SB

Good

Over: NHRR

0.4 MI THORNTON TL, Grafton, NH

Built 1970 Load: 53.5 t ADT: 7,500

CHRISTIE ROAD

Good

Over: STRATFORD BOG BROOK

320 FT FROM BOG ROAD., Coos, NH

Built 2003 Load: 53.5 t ADT: 90

RESERVOIR DRIVE

Good

Over: PISCATAQUOG RIVER

0.10 MI FR PAGE HILL RD, Hillsborough, NH

Built 1994 Load: 53.5 t ADT: 1,340

SHAKER ROAD

Good

Over: BROOK

Adjacent to jct NH140, Merrimack, NH

Built 2019 Load: 53.6 t ADT: 1,214

NH104 PLEASANT ST

Good

Over: NEWFOUND RIVER

0.9 MI E ALEXANDRIA TL, Grafton, NH

Built 1996 Load: 53.7 t ADT: 5,700

DREW ROAD

Good

Over: DREW BROOK

0.8 M HAMPSTEAD T/L, Rockingham, NH

Built 2011 Load: 53.8 t ADT: 446

NH 27

Good

Over: NH101

.3 MI FROM JCT. I-95, Rockingham, NH

Built 1996 Load: 53.9 t ADT: 10,018

PINE HILL ROAD

Good

Over: US 3 FEE TPK

.2 MI FROM NH 130, Hillsborough, NH

Built 1994 Load: 53.9 t ADT: 6,626

HAVERHILL ROAD

Good

Over: SPICKET RIVER

COWBELL CORNER, Rockingham, NH

Built 2008 Load: 54.0 t ADT: 2,356

I-89 SB

Good

Over: NH103

0.4 MI HOPKINTON T.L., Merrimack, NH

Built 1966 Load: 54.1 t ADT: 10,378

FLING ROAD

Good

Over: CLAY BROOK

.35 MI. EAST OF ROUTE 12, Sullivan, NH

Built 2011 Load: 54.2 t ADT: 90

NH101 EB

Good

Over: NH111

.2 MI FROM HAMPTON TL, Rockingham, NH

Built 2000 Load: 54.2 t ADT: 22,995

RESERVOIR ROAD

Good

Over: CAMP BROOK

0.9 MI FR NH RTE 10/120, Grafton, NH

Built 2021 Load: 54.2 t ADT: 480

HANOVER CENTER RD

Good

Over: MONAHAN BROOK

4.2 MI FR LYME TL, Grafton, NH

Built 1929 Load: 54.2 t ADT: 1,214

NH 25 NH118

Good

Over: PATCH BROOK

0.8 MI FROM WENTWORTH TL, Grafton, NH

Built 1962 Load: 54.2 t ADT: 3,654

NH103

Good

Over: SUGAR RIVER

0.2 M W NEWPORT T.L., Sullivan, NH

Built 1957 Load: 54.3 t ADT: 2,926

NH101 EB

Good

Over: CONNOR FARM ROAD

0.6MI W NH 27 OVERPASS, Rockingham, NH

Built 2000 Load: 54.4 t ADT: 21,071

NH101 WB

Good

Over: CONNOR FARM ROAD

0.6MI W NH 27 OVERPASS, Rockingham, NH

Built 2000 Load: 54.4 t ADT: 20,611

NH108 COURT ST

Good

Over: LITTLE RIVER

.6 MI FROM JCT 101C, Rockingham, NH

Built 2018 Load: 54.4 t ADT: 5,172

OLD SHAKER ROAD

Good

Over: SHAKER BROOK

1.7 MI FROM RTE 106, Merrimack, NH

Built 1920 Load: 54.4 t ADT: 395

RIVER STREET

Good

Over: SACO RIVER OVERFLOW

0.50 M. FROM US302, Carroll, NH

Built 2015 Load: 54.5 t ADT: 444

US 4

Good

Over: TEWKSBURY POND OUTLET

1/4MI S TEWKSBURY POND, Grafton, NH

Built 2000 Load: 54.5 t ADT: 1,822

I-89 NB

Good

Over: NH103

0.5 MI HOPKINTON T.L., Merrimack, NH

Built 1966 Load: 54.5 t ADT: 10,031

EVANS ROAD

Good

Over: S BRANCH BAKER RIVER

60 FT FR NO DORCHESTER R, Grafton, NH

Built 1937 Load: 54.5 t ADT: 90

US 4 NH 10

Good

Over: MASCOMA RIVER

6.4 MI FROM HANOVER TL, Grafton, NH

Built 1954 Load: 54.6 t ADT: 8,230

I-93 NB

Good

Over: BEAVER BROOK

AT LONDONDERRY TL, Rockingham, NH

Built 2019 Load: 54.8 t ADT: 40,201

HUMMINGBIRD LANE

Good

Over: SAND BROOK

0.4 MI FR. HENNIKER T/L, Hillsborough, NH

Built 2013 Load: 54.8 t ADT: 300

PARKER ROAD

Good

Over: PISCATAQUOG RIVER

NEW BOSTON TL, Hillsborough, NH

Built 2000 Load: 54.9 t ADT: 1,335

NH145

Good

Over: BISHOP BROOK

2.8 MI N OF COLBROOK TL, Coos, NH

Built 2017 Load: 54.9 t ADT: 708

Showing 2,101-2,150 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.