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

NH132

Good

Over: WINNIPESAUKEE RIVER

NORTHFIELD-TILTON TL, Merrimack, NH

Built 1960 Load: 42.5 t ADT: 4,832

I-93 SB RAMPS

Good

Over: I-93 SB

0.2 MI S OF JCT NH 38, Rockingham, NH

Built 2008 Load: 42.5 t ADT: 18,539

NH 9

Good

Over: N BR CONTOOCOOK RIVER

0.1 MI NE TO ANTRIM T/L, Cheshire, NH

Built 1999 Load: 42.5 t ADT: 5,241

RABBIT HOLLOW ROAD

Good

Over: PERRY BROOK

0.12 MI FROM LAKE RD, Cheshire, NH

Built 2020 Load: 42.5 t ADT: 90

I-89 NB

Good

Over: NORTH VILLAGE ROAD

5.2 MI HOPKINTON T.L., Merrimack, NH

Built 1966 Load: 42.5 t ADT: 10,670

BLACKWATER ROAD

Good

Over: MASCOMA RIVER

0.8 MI US 4, Grafton, NH

Built 1992 Load: 42.6 t ADT: 90

I-93 US 4 SB

Good

Over: SEWALLS FALLS ROAD

1.4MI SO OF JCT RT 3 BYP., Merrimack, NH

Built 1959 Load: 42.6 t ADT: 23,035

I-93 US 4 NB

Good

Over: SEWALLS FALLS ROAD

1.4 MI. S. JCT. RT 3 BYP., Merrimack, NH

Built 1959 Load: 42.6 t ADT: 22,866

PINE HILL ROAD

Good

Over: CROYDON BRANCH SUGAR R

0.1 MI NH 10, Sullivan, NH

Built 1989 Load: 42.6 t ADT: 554

BRIDLE BRIDGE ROAD

Good

Over: BEAVER BROOK

0.4 MI. RTE. 111, Hillsborough, NH

Built 1995 Load: 42.6 t ADT: 765

I-93 NB

Good

Over: US 3

1.7 MI NORTH WOODSTOCK T, Grafton, NH

Built 1985 Load: 42.6 t ADT: 5,375

I-93 SB

Good

Over: BODWELL ROAD

3.2 MI S.W JCT RT 28, Hillsborough, NH

Built 1962 Load: 42.6 t ADT: 39,949

I-93 NB

Good

Over: BODWELL ROAD

3.2 MI SW JCT RT28, Hillsborough, NH

Built 1962 Load: 42.6 t ADT: 37,900

LINCOLN STREET

Good

Over: GREAT BROOK

0.1 MI FR UNION ST, Hillsborough, NH

Built 1992 Load: 42.6 t ADT: 1,776

PACKERS FALLS ROAD

Good

Over: PISCASSIC RIVER

.39 MI SW DURHAM TL, Rockingham, NH

Built 1931 Load: 42.6 t ADT: 1,347

PATROL SHED ROAD

Good

Over: STONY BROOK

2.01 MI N JACKSON TL, Coos, NH

Built 2011 Load: 42.6 t

W. SALISBURY ROAD

Good

Over: BLACKWATER RIVER

4.05 MI FROM WARNER TL, Merrimack, NH

Built 1990 Load: 42.6 t ADT: 90

WARNER ROAD

Good

Over: BLACKWATER RIVER

3.06 MI FROM WARNER TL, Merrimack, NH

Built 1993 Load: 42.6 t ADT: 90

I-89 NB

Good

Over: WEST JOPPA ROAD

4.4 MI HOPKINTON T.L., Merrimack, NH

Built 1966 Load: 42.6 t ADT: 10,670

I-89 SB

Good

Over: WEST JOPPA ROAD

4.5 MI HOPKINTON TL, Merrimack, NH

Built 1966 Load: 42.6 t ADT: 10,636

I-93 SB

Good

Over: NORTH LOWELL ROAD

0.6 MI SOUTH DERRY TL, Rockingham, NH

Built 1995 Load: 42.6 t ADT: 40,312

RESERVOIR ROAD

Good

Over: CLAY BROOK

.5 M F NEW HEBRON RD, Grafton, NH

Built 2007 Load: 42.7 t ADT: 433

NH101 EB

Good

Over: US 3

NH101 EB over US 3, Hillsborough, NH

Built 2006 Load: 42.8 t ADT: 25,262

I-93 NB

Good

Over: STONEHENGE ROAD

1.0 MI S JCT RT 28, Rockingham, NH

Built 1995 Load: 42.8 t ADT: 35,850

NH 16 NH 25

Good

Over: BEARCAMP RIVER

2.5 MI S TAMWORTH T/L, Carroll, NH

Built 2021 Load: 42.8 t ADT: 11,527

WIECZOREK DR

Good

Over: US 3

.4 M WEST OF I-93, Hillsborough, NH

Built 2011 Load: 42.9 t ADT: 22,774

SNOW ROAD

Good

Over: SOUTH RIVER

0.13 MI. RT 153, Carroll, NH

Built 2021 Load: 42.9 t ADT: 155

LEAR HILL ROAD

Good

Over: S BRANCH SUGAR RIVER

220 Ft.Fr. NH Rte 10, Sullivan, NH

Built 1991 Load: 42.9 t ADT: 283

NH101

Good

Over: TIDE MILL CREEK

1.2 MI FROM JCT US 1, Rockingham, NH

Built 1988 Load: 42.9 t ADT: 8,041

I-93 NB

Good

Over: COHAS BROOK

1.6MI E JCT RT 28, Hillsborough, NH

Built 1962 Load: 42.9 t ADT: 37,900

C-D ROAD

Good

Over: RAMP D TOLL ACCESS DR

1.1 MI N MASS SL, Hillsborough, NH

Built 1996 Load: 42.9 t ADT: 9,994

CHURCH STREET

Good

Over: CONNECTICUT RIVER NECRR

VERMONT STATE LINE, Cheshire, NH

Built 1983 Load: 42.9 t ADT: 9,216

ABIJAH BRIDGE ROAD

Good

Over: LAKE HORACE

0.5 MI FROM DEERING TL, Hillsborough, NH

Built 2009 Load: 42.9 t ADT: 90

RIVER ROAD NORTH

Good

Over: ALDRICH BROOK

0.57MI NH12, Cheshire, NH

Built 2014 Load: 42.9 t ADT: 115

WHITTEN NECK ROAD

Good

Over: CRESCENT LAKE INLET

0.19 Mi.Fr. NH 28, Carroll, NH

Built 2005 Load: 42.9 t ADT: 495

CHICHESTER ROAD

Good

Over: BEE HOLE BROOK

0.4 MI S CHICHESTER TL, Merrimack, NH

Built 2006 Load: 43.0 t ADT: 1,701

MONT VERNON ROAD

Good

Over: CEASARS BROOK

0.7 MI E MOUNT VERNON TL, Hillsborough, NH

Built 2023 Load: 43.1 t ADT: 187

US302 NH 16

Good

Over: ARTIST FALLS BROOK

6.2 MI FROM ALBANY TL, Carroll, NH

Built 1900 Load: 43.1 t ADT: 15,384

GLENWOOD AVENUE

Good

Over: NH 16 SP TPK

.7 MI. FROM JCT. 16, Strafford, NH

Built 1957 Load: 43.1 t ADT: 2,600

US 4

Good

Over: BUNKER CREEK

1.8 MI W. MADBURY T.L., Strafford, NH

Built 2020 Load: 43.1 t ADT: 15,934

CHESHAM ROAD

Good

Over: MINNEWAWA BROOK

.91 MI. NE DUBLIN TL, Cheshire, NH

Built 1953 Load: 43.1 t ADT: 1,353

MANCHESTER STREET

Good

Over: PENNICHUCK RESERVOIR

AT NASHUA TL, Hillsborough, NH

Built 2015 Load: 43.1 t ADT: 4,378

QUINCY ROAD

Good

Over: STINSON BROOK

2.9 MI. N. OF PLYMOUTH TL, Grafton, NH

Built 1937 Load: 43.1 t ADT: 920

LUND LANE

Good

Over: ORE HILL BROOK

0.32 MI FROM NH RTE 25C, Grafton, NH

Built 2003 Load: 43.2 t ADT: 183

JENKINS ROAD

Good

Over: MCQUADE BROOK

0.3 MI N. OF Merr. T/L, Hillsborough, NH

Built 2012 Load: 43.3 t ADT: 2,319

CENTER ROAD

Good

Over: US202 NH 9

2.2MI W HENNIKER T/L, Hillsborough, NH

Built 2002 Load: 43.3 t ADT: 2,282

OLD HENNIKER ROAD

Good

Over: US202 NH 9

1.2MI W HENNIKER T/L, Hillsborough, NH

Built 2002 Load: 43.3 t ADT: 90

FEE TPK NB ON RAMP

Good

Over: FEE TPK SB OFF RAMPS

1.2 MI N MASS SL, Hillsborough, NH

Built 1996 Load: 43.3 t ADT: 55,063

NH 16B

Good

Over: BEECH RIVER

.3 MI JCT. 16, Carroll, NH

Built 1932 Load: 43.3 t ADT: 2,052

NH 16 SP TPK RAMP

Good

Over: NH125

3.25 MI N DOVER T/L, Strafford, NH

Built 2009 Load: 43.3 t ADT: 29,913

Showing 1,651-1,700 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.