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

NH123A

Good

Over: BOWERS BROOK

IN S ACWORTH VILLAGE, Sullivan, NH

Built 2018 Load: 43.5 t ADT: 1,214

NH122

Good

Over: SOUHEGAN RIVER REC PATH

2.35 MI N HOLLIS TL, Hillsborough, NH

Built 1956 Load: 43.5 t ADT: 6,692

NH 3A

Good

Over: NEWFOUND RIVER

0.7 MI N OF JCT RTE 104, Grafton, NH

Built 1999 Load: 43.5 t ADT: 6,806

RIVER ROAD

Good

Over: MASCOMA RIVER

2.6 MI FROM DORCHESTERTL, Grafton, NH

Built 2010 Load: 43.5 t ADT: 90

US 4

Good

Over: MASCOMA RIVER

3.0 MI FROM ENFIELD TL, Grafton, NH

Built 2004 Load: 43.5 t ADT: 6,828

NH 12A

Good

Over: NH 12 NECRR

2.1 MI. FROM WALPOLE TL, Sullivan, NH

Built 1970 Load: 43.5 t ADT: 1,804

WEBSTER MILLS ROAD

Good

Over: SANBORN BROOK

0.8MI. PITTSFIELD TL, Merrimack, NH

Built 2006 Load: 43.5 t ADT: 518

MAPLE STREET

Good

Over: HORNES BROOK

0.2MI. NH102, Rockingham, NH

Built 1998 Load: 43.5 t ADT: 1,485

MANSION ROAD

Good

Over: STARK BROOK

TOWN RD, Merrimack, NH

Built 2018 Load: 43.5 t ADT: 90

US 4 US202 NH 9

Good

Over: SUNCOOK RIVER

.3 MI EAST JCT RT 28, Merrimack, NH

Built 1971 Load: 43.5 t ADT: 16,677

BIBLE HILL ROAD

Good

Over: NH 9 RAMP A

NH 9 under Bible Hill Ro, Hillsborough, NH

Built 2000 Load: 43.5 t ADT: 90

I-293 WB NH101

Good

Over: NH 3A BROWN AVE

1.2MI W JCT RTE 28, Hillsborough, NH

Built 2004 Load: 43.5 t ADT: 44,045

DAVIS CROSSING RD

Good

Over: ELA RIVER

1/4 MI. NORTH FROM RT. 11, Carroll, NH

Built 2010 Load: 43.5 t ADT: 90

NH 85

Good

Over: CSX

.45 MI SW JCT 108, Rockingham, NH

Built 2006 Load: 43.5 t ADT: 5,963

US 1

Good

Over: SAGAMORE CREEK

3.0MI N. OF RYE TL, Rockingham, NH

Built 2000 Load: 43.5 t ADT: 15,546

NH 32

Good

Over: S BRANCH ASHUELOT RIVER

2.79MI. S. KEENE TL, Cheshire, NH

Built 2002 Load: 43.5 t ADT: 3,652

STAGE ROAD

Good

Over: LITTLE SUGAR RIVER

2.9 MI. CHARLESTOWN TL, Sullivan, NH

Built 1999 Load: 43.5 t ADT: 241

STANTON FARM RD

Good

Over: RAZOR BROOK

0.2 MI FR COBB RD, Carroll, NH

Built 1991 Load: 43.6 t ADT: 90

I-93 PARKWAY SB

Good

Over: I-93(RAMP 3S-F)

4.7 MI NO WOODSTOCK TL, Grafton, NH

Built 1986 Load: 43.6 t ADT: 5,020

I-93 PARKWAY NB

Good

Over: I-93(RAMP 3S-F)

4.6 MI NO WOODSTOCK TL, Grafton, NH

Built 1986 Load: 43.6 t ADT: 5,250

I-93 NB

Good

Over: HANSON BROOK

3.2 MI NO WOODSTOCK TL, Grafton, NH

Built 1984 Load: 43.6 t ADT: 5,250

REDINGTON STREET

Good

Over: AMMONOOSUC RIVER

0.3 MI FR BETHLEHEM TL, Grafton, NH

Built 2011 Load: 43.6 t ADT: 2,102

OSSIPEE MT ROAD

Good

Over: HALFWAY BROOK

1.6 MI. SANDWICH TL, Carroll, NH

Built 1949 Load: 43.6 t ADT: 354

NH 28

Good

Over: CSX(ABD)

1.6 MI WOLFEBORO T.L., Carroll, NH

Built 1959 Load: 43.6 t ADT: 4,489

PRESCOTT ROAD

Good

Over: NH101

.2 MI WEST EPPING TL, Rockingham, NH

Built 1985 Load: 43.6 t ADT: 819

US 2

Good

Over: RATTLE RIVER

2.9 MI EAST OF GORHAM T/L, Coos, NH

Built 1973 Load: 43.6 t ADT: 3,361

I-93 SB

Good

Over: NHRR

0.6MI FR NEW HAMPTON T.L., Grafton, NH

Built 1963 Load: 43.7 t ADT: 10,717

I-93 NB

Good

Over: NHRR

0.6 MI FROM NEW HAMPTON T, Grafton, NH

Built 1963 Load: 43.7 t ADT: 10,714

US302 NH 10

Good

Over: WILD AMMONOOSUC RIVER

2.0 MI FR HAVERHILL TL, Grafton, NH

Built 1989 Load: 43.7 t ADT: 3,481

NH 9

Good

Over: I-393 US 4 US202

.2 MI W PEMBROOK TL, Merrimack, NH

Built 1988 Load: 43.7 t ADT: 9,207

NH 3A SO MAIN ST

Good

Over: PISCATAQUOG RIVER

0.04 MI FROM VARNEY ST, Hillsborough, NH

Built 1894 Load: 43.7 t ADT: 12,960

MEREDITH CENTER RD

Good

Over: OUTLET WICKWAS POND

1.3 MI NW LACONIA TL, Belknap, NH

Built 2019 Load: 43.7 t ADT: 4,167

NH101A BP SOMERSET

Good

Over: FEE TPK

1.3 MI FR MERRIMACK TL, Hillsborough, NH

Built 1989 Load: 43.7 t ADT: 17,545

ROWENTOWN ROAD

Good

Over: S BRANCH BAKER RIVER

.2 MI FR NO DORCHESTER R, Grafton, NH

Built 1995 Load: 43.7 t ADT: 90

WARMAC ROAD

Good

Over: PERRY BROOK

0.83MI RTE 32, Cheshire, NH

Built 2013 Load: 43.8 t ADT: 90

US 4 NH 16 TPK NB

Good

Over: LITTLE BAY RD

DOVER-NEWINGTON T.L., Strafford, NH

Built 1966 Load: 43.9 t ADT: 33,527

ACCESS ROAD

Good

Over: I-93 NB OFF RAMP

2.6 M NORTH MANCHESTER TL, Merrimack, NH

Built 1978 Load: 43.9 t ADT: 500

ELM STREET

Good

Over: PAUGUS BAY

0.1 MI UNION AVE, Belknap, NH

Built 2003 Load: 43.9 t ADT: 5,633

DUNBARTON ROAD

Good

Over: BLACK BROOK

0.2 MI GOFFSTOWN TL, Hillsborough, NH

Built 1989 Load: 43.9 t ADT: 3,088

I-93 NB

Good

Over: US 3 NH 25

0.8 MI FROM NEW HAMPTON T, Grafton, NH

Built 1963 Load: 44.1 t ADT: 10,709

WEST ROAD

Good

Over: HOYT BROOK

6.6 MI FROM WARNER TL, Merrimack, NH

Built 2010 Load: 44.1 t ADT: 1,214

NH 9

Good

Over: CONNECTICUT RIVER

RT9 NH/VT BORDER, Cheshire, NH

Built 2003 Load: 44.1 t ADT: 11,201

ECHO VALLEY FARM R

Good

Over: GRIFFIN BROOK

TOWN RD, Merrimack, NH

Built 2017 Load: 44.1 t ADT: 90

NH115

Good

Over: ISRAEL RIVER

1.2 MI SW JCT US RTE 2, Coos, NH

Built 1984 Load: 44.1 t ADT: 3,637

SPRING STREET

Good

Over: GREAT BROOK

0.3 MI FR NH ROUTE 120, Grafton, NH

Built 1953 Load: 44.1 t ADT: 579

I-93 SB

Good

Over: NHRR

0.3 MI HOLDERNESS TL, Grafton, NH

Built 1964 Load: 44.1 t ADT: 11,400

I-93 NB

Good

Over: NHRR

0.3 MI HOLDERNESS TL, Grafton, NH

Built 1964 Load: 44.1 t ADT: 11,292

COBBLE HILL ROAD

Good

Over: CALIFORNIA BROOK

0.10MI RTE 10, Cheshire, NH

Built 2013 Load: 44.1 t ADT: 419

HAZEN ROAD

Good

Over: JOHNS RIVER

2.3 MI FR JEFFERSON TL, Coos, NH

Built 2020 Load: 44.1 t ADT: 90

JENNISON ROAD

Good

Over: HARTSHORN BROOK

1.1 MI FR MT VERNON TL, Hillsborough, NH

Built 2015 Load: 44.2 t ADT: 1,414

Showing 1,701-1,750 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.