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

NH101 WB

Good

Over: NH107

4.7MI EAST OF CANDIA TL, Rockingham, NH

Built 1983 Load: 49.4 t ADT: 20,577

NORTH STREET

Good

Over: MILLERS RIVER

0.5 MI. RTE.119, Cheshire, NH

Built 2003 Load: 49.4 t ADT: 400

BRIDGE STREET

Good

Over: COCHECO RIVER

0.03MI RTE 202A, Strafford, NH

Built 1920 Load: 49.4 t ADT: 1,261

AYERS POND ROAD

Good

Over: WOODWARD BROOK

0.7 MI FR EAST WASH. RD, Sullivan, NH

Built 2020 Load: 49.4 t ADT: 90

PERKINS POND ROAD

Good

Over: PEACOCK BROOK

100 yds south jct NH149, Hillsborough, NH

Built 1998 Load: 49.4 t ADT: 90

LOON COVE ROAD

Good

Over: WATSON BROOK

200 FT EAST NH 11, Belknap, NH

Built 2022 Load: 49.5 t ADT: 90

SECOND NH TPK

Good

Over: S BR PISCATAQUOG RIVER

1.72MI. RTE 47, Hillsborough, NH

Built 2014 Load: 49.5 t ADT: 1,214

RIVER ROAD

Good

Over: CSX

1.4 MI FROM HOOKSETT TL, Merrimack, NH

Built 1989 Load: 49.6 t ADT: 639

NH101 EB

Good

Over: PISCASSIC RIVER

1.1MI E NH101/NH125 JCT, Rockingham, NH

Built 1997 Load: 49.6 t ADT: 20,167

NH101 EB

Good

Over: NH125

.4 MI N BRENTWOOD TL, Rockingham, NH

Built 1997 Load: 49.6 t ADT: 23,992

NH101

Good

Over: LITTLE RIVER

EXETER, Rockingham, NH

Built 2000 Load: 49.6 t ADT: 41,682

LINDEN STREET

Good

Over: LITTLE RIVER

0.39MI. RTE 111, Rockingham, NH

Built 2015 Load: 49.6 t ADT: 2,854

WOODBURY AVENUE

Good

Over: US 1 BYPASS

0.6 MI FROM MAINE SL, Rockingham, NH

Built 2020 Load: 49.6 t ADT: 5,073

I-93 FEE TPK SB

Good

Over: I-89 TURKEY RIVER PED

BOW INTERCHANGE, Merrimack, NH

Built 2014 Load: 49.8 t ADT: 34,773

I-93 FEE TPK NB

Good

Over: I-89 TURKEY RIVER

BOW INTERCHANGE., Merrimack, NH

Built 2014 Load: 49.8 t ADT: 34,022

GOOSE POND ROAD

Good

Over: GOOSE POND BROOK

3.8 MI FROM HANOVER TL, Grafton, NH

Built 2014 Load: 49.9 t ADT: 815

NH101 EB

Good

Over: OLD CANDIA ROAD

.85 MI.E. OF CHESTER TPK, Rockingham, NH

Built 1985 Load: 49.9 t ADT: 25,607

NH101 WB

Good

Over: OLD CANDIA ROAD

.09 MI. EAST OF B&MRR, Rockingham, NH

Built 1985 Load: 49.9 t ADT: 25,607

US 4

Good

Over: NHRR(ABD)

3.8 MI FROM ORANGE TL, Grafton, NH

Built 1941 Load: 49.9 t ADT: 1,822

NH109

Good

Over: MELVIN RIVER

6.5 MI FROM WOLFEBORO TL, Carroll, NH

Built 1921 Load: 49.9 t ADT: 2,119

RESERVOIR DRIVE

Good

Over: PISCATAQUOG RIVER

73 FT FR PAIGE HILL ROAD, Hillsborough, NH

Built 1993 Load: 49.9 t ADT: 2,002

GOVERNORS ROAD

Good

Over: CHURCHILL BROOK

0.2 MI S JCT 109, Carroll, NH

Built 1940 Load: 50.0 t ADT: 90

FORDWAY ROAD

Good

Over: BEAVER BROOK

0.4MI. NH102, Rockingham, NH

Built 2010 Load: 50.0 t ADT: 6,133

NH 9

Good

Over: ASH SWAMP BROOK

3.2 MI E WESTMORELAND TL, Cheshire, NH

Built 2006 Load: 50.0 t ADT: 22,086

I-93 NB ON RAMP

Good

Over: RECREATION TRAIL

1.5MI S Manchester T/L, Rockingham, NH

Built 2009 Load: 50.1 t ADT: 12,714

US302

Good

Over: ALBANY BROOK

1.0 MI FROM HARTS LOC. TL, Carroll, NH

Built 1928 Load: 50.2 t ADT: 2,719

US302

Good

Over: STONY BROOK

0.3 MI FROM BARTLETT TL, Carroll, NH

Built 1939 Load: 50.2 t ADT: 2,768

WOODWARD HILL ROAD

Good

Over: BRENNAN BROOK

TOWN RD, Hillsborough, NH

Built 2015 Load: 50.3 t ADT: 90

DAVIS PLACE

Good

Over: JEWETT BROOK

472 FT FR UNION AVE&US3, Belknap, NH

Built 2006 Load: 50.3 t ADT: 199

US 2 US 3

Good

Over: ISRAEL RIVER

4.6 MI FROM WHITEFIELD TL, Coos, NH

Built 1990 Load: 50.3 t ADT: 9,084

PARADISE ROAD

Good

Over: WENDELL BROOK

170 FT. SUNAPEE TL, Sullivan, NH

Built 1998 Load: 50.3 t ADT: 1,350

I-393 US 4 US202W

Good

Over: NH 9

.5 MI E CONCORD TL, Merrimack, NH

Built 1988 Load: 50.3 t ADT: 7,980

NH123

Good

Over: COLD RIVER

1.34MI SE VT SL, Cheshire, NH

Built 2008 Load: 50.3 t ADT: 2,763

DUFOUR ROAD

Good

Over: S BRANCH BAKER RIVER

0.19MI NH25, Grafton, NH

Built 1981 Load: 50.3 t ADT: 90

STONE ROAD

Good

Over: AYERS BROOK

4.32MI. RTE 107, Belknap, NH

Built 1999 Load: 50.4 t ADT: 90

RIVER ROAD

Good

Over: HEWES BROOK

1.2 MI. TL HANOVER, Grafton, NH

Built 2020 Load: 50.4 t ADT: 282

INDUSTRIAL DRIVE

Good

Over: FEE TPK

1.0 MI.FR. NASHUA T/L, Hillsborough, NH

Built 1990 Load: 50.4 t ADT: 9,318

WATER STREET

Good

Over: BEAVER BROOK

0.33 MI FROM MAIN ST, Cheshire, NH

Built 2001 Load: 50.5 t ADT: 2,557

OLD COUNTRY ROAD

Good

Over: WATERLOOM POND OUTLET

340 FT FR RIVER RD, Hillsborough, NH

Built 2005 Load: 50.5 t ADT: 90

I-93 NB

Good

Over: NHRR

4.6 MI PLYMOUTH TL, Grafton, NH

Built 1968 Load: 50.6 t ADT: 9,864

NH153

Good

Over: OSSIPEE RIVER

0.1 MI N JCT RTE 25, Carroll, NH

Built 1956 Load: 50.6 t ADT: 3,541

GUINEA ROAD

Good

Over: NH101

1.1 MI FROM HAMPTON TL, Rockingham, NH

Built 1995 Load: 50.6 t ADT: 2,632

BRALEY ROAD

Good

Over: COCKERMOUTH RIVER

0.16 MI FR WEST SHORE RD, Grafton, NH

Built 2009 Load: 50.6 t ADT: 60

NH121

Good

Over: LITTLE RIVER CSX

0.5 MI FROM JCT RTE 125, Rockingham, NH

Built 2006 Load: 50.6 t ADT: 10,556

NH101 EB

Good

Over: NH107

4.7MI EAST OF CANDIA TL, Rockingham, NH

Built 1983 Load: 50.6 t ADT: 26,105

NH 16 SP TPK

Good

Over: NH 16 CONNECTOR

2.5 MI S OF MILTON TL, Strafford, NH

Built 1978 Load: 50.6 t ADT: 23,219

ROLLINS ROAD

Good

Over: MAIN STREET CSX

1.0 MI FROM JCT NH 4, Strafford, NH

Built 2000 Load: 50.6 t ADT: 3,508

MOUNTAIN ROAD

Good

Over: BLACKWATER RIVER

TOWN RD 0.94 MI ANDOVER, Merrimack, NH

Built 2010 Load: 50.6 t ADT: 90

TILTON BRIDGE ROAD

Good

Over: SALMON BROOK

0.21 MI. RTE. 127, Belknap, NH

Built 1900 Load: 50.6 t ADT: 90

SPRING STREET

Good

Over: ELA RIVER

0.37 RTE 11, Strafford, NH

Built 1998 Load: 50.7 t ADT: 759

Showing 2,001-2,050 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.