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

NORTH ROAD

Good

Over: NH101

0.5 MI WEST JCT NH 27, Rockingham, NH

Built 1992 Load: 48.4 t ADT: 3,503

I-393 US 4 US202E

Good

Over: SOUCOOK RIVER

CONCORD PEMBROOK TL, Merrimack, NH

Built 1988 Load: 48.4 t ADT: 8,657

NH116

Good

Over: GALE RIVER

4.4 MI N. EASTON T.L., Grafton, NH

Built 1992 Load: 48.4 t ADT: 2,272

US 3

Good

Over: INDIAN STREAM

2.5 MI N OF CLARKSVILLETL, Coos, NH

Built 1976 Load: 48.4 t ADT: 1,406

STAGE ROAD

Good

Over: LITTLE SUGAR RIVER

1.5 MI. CHARLESTOWN TL, Sullivan, NH

Built 2008 Load: 48.4 t ADT: 90

I-89 NH 10 SB

Good

Over: NHRR(ABD)

2.1MI FROM ENFIELD T.L., Grafton, NH

Built 1966 Load: 48.5 t ADT: 16,350

PERCY ROAD

Good

Over: STRATFORD BOG BROOK

220 FT FROM BOG ROAD 50, Coos, NH

Built 2002 Load: 48.5 t ADT: 90

I-293 EB NH101 EB

Good

Over: FEE TPK

.3 MI E JCT US 3, Hillsborough, NH

Built 1993 Load: 48.6 t ADT: 35,970

NH 28

Good

Over: TRIBUTARY G

200 S OF BRADFORD ST, Rockingham, NH

Built 2015 Load: 48.6 t ADT: 10,443

NH101

Good

Over: NH 28 BYPASS

.2 MI W. AUBURN T.L., Hillsborough, NH

Built 1961 Load: 48.6 t ADT: 54,289

HUSE ROAD

Good

Over: I-293 NH101

1.3 MI E JCT RTE 28, Hillsborough, NH

Built 1960 Load: 48.6 t ADT: 7,045

CASTLE HILL ROAD

Good

Over: BEAVER BROOK

0.02 MI FR PELHAM TL, Rockingham, NH

Built 2021 Load: 48.6 t ADT: 273

DEPOT STREET

Good

Over: RELIEF

0.2MI BENNINGTON TL, Hillsborough, NH

Built 1914 Load: 48.7 t ADT: 985

US 3 WATER ST

Good

Over: CSX

0.3 MI WEST OF JCT I-93, Merrimack, NH

Built 2000 Load: 48.8 t ADT: 20,082

DANIEL WEBSTER HWY

Good

Over: US 3 FEE TPK NB RAMP

0.02 MI FROM ROBINSON RD, Hillsborough, NH

Built 1955 Load: 48.8 t ADT: 5,029

MAPLEWOOD AVENUE

Good

Over: US 1 BYPASS

.8 MI FROM JCT NH 16, Rockingham, NH

Built 2015 Load: 48.8 t ADT: 8,045

BERRY ROAD

Good

Over: SMITH RIVER

.25 MI EAST NH 104, Grafton, NH

Built 2005 Load: 49.0 t ADT: 271

DYERS CROSSING RD

Good

Over: SUCKER BROOK

0.05 MI NH 11, Merrimack, NH

Built 2005 Load: 49.0 t ADT: 102

RIVER STREET

Good

Over: SQUAM RIVER

100 FT FR NH RTE 25, Grafton, NH

Built 1941 Load: 49.0 t ADT: 90

FEE TPK

Good

Over: WIECZOREK DR

1/4 MILE SOUTH FROM TOLL, Hillsborough, NH

Built 2010 Load: 49.0 t ADT: 50,555

PINE ROAD

Good

Over: LITTLE RIVER

.3 mi s jct old 101, Rockingham, NH

Built 1998 Load: 49.0 t ADT: 187

NH 26

Good

Over: MOHAWK RIVER

8MI EAST OF JCT US3, Coos, NH

Built 2007 Load: 49.0 t ADT: 917

PLEASANT POND ROAD

Good

Over: PISCATAQUOG RIVER

0.9MI. FRANCESTOWN TL, Hillsborough, NH

Built 1939 Load: 49.0 t ADT: 90

NH 87

Good

Over: LAMPREY RIVER OVERFLOW

1.25 MI SE JCT NH 125, Rockingham, NH

Built 2004 Load: 49.0 t ADT: 2,629

NH101 EB RAMP

Good

Over: CSX

0.2 MI E JCT NH 85, Rockingham, NH

Built 1998 Load: 49.0 t ADT: 25,332

NH101 EB

Good

Over: SQUAMSCOTT RIVER

At Stratham Town Line, Rockingham, NH

Built 1998 Load: 49.0 t ADT: 23,758

NH101 WB

Good

Over: SQUAMSCOTT RIVER

0.3 MI E JCT NH 85, Rockingham, NH

Built 1994 Load: 49.0 t ADT: 23,375

NH175A

Good

Over: PEMIGEWASSET RIVER

0.1 MI E JCT US 3, Grafton, NH

Built 2006 Load: 49.0 t ADT: 7,511

NH 12

Good

Over: BRANCH RIVER

1.0 MI FROM KEENE CENTER, Cheshire, NH

Built 1994 Load: 49.0 t ADT: 19,665

NH120

Good

Over: GREAT BROOK

2.2 MI FROM PLAINFIELD TL, Grafton, NH

Built 1944 Load: 49.0 t ADT: 2,619

RIDGE ROAD

Good

Over: SALMON BROOK

.5 MI W OF E DUNSTABLE RD, Hillsborough, NH

Built 1998 Load: 49.0 t ADT: 4,766

ROBY ROAD

Good

Over: LANE RIVER

1.2 MI. WARNER TL, Merrimack, NH

Built 2002 Load: 49.0 t ADT: 321

WEBSTER HIGHWAY

Good

Over: WHITING BROOK

0.30MI WILTON TL, Hillsborough, NH

Built 2000 Load: 49.0 t ADT: 181

NH118

Good

Over: BERRY BROOK

.1 MI. FROM JCT. NH 25, Grafton, NH

Built 1950 Load: 49.0 t ADT: 1,127

TWIN BRIDGE ROAD

Good

Over: MID BR PISCATAQUOG RIVER

0.3 MI FR NEW BOSTON TL, Hillsborough, NH

Built 1999 Load: 49.0 t ADT: 90

AIRPORT ROAD

Good

Over: AIRPORT MARSH OUTLET

0.6 MI FR NH RTE 116, Coos, NH

Built 2009 Load: 49.0 t ADT: 549

NH101 WB

Good

Over: BLOODY BROOK

0.3MI W NH 27 OVERPASS, Rockingham, NH

Built 1998 Load: 49.2 t ADT: 23,041

LOUDON RIDGE ROAD

Good

Over: ACADEMY BROOK

0.4 MI FR LOWERRIDGE RD, Merrimack, NH

Built 2023 Load: 49.2 t ADT: 278

NH 16 SP TPK RAMP

Good

Over: COCHECO RIVER

SB OFFRAMP OVER COCHECO, Strafford, NH

Built 2012 Load: 49.2 t ADT: 2,820

OLD MILL BROOK RD

Good

Over: MILL BROOK

0.16MI NH12, Cheshire, NH

Built 2005 Load: 49.2 t ADT: 90

NH 11

Good

Over: NHRR(ABD)

1.4 MILES FROM WILMOT T/L, Merrimack, NH

Built 2010 Load: 49.3 t ADT: 5,505

BRIDGE STREET

Good

Over: BRANCH RIVER

0.27MI. RTE 153, Carroll, NH

Built 2001 Load: 49.3 t ADT: 154

NH123A

Good

Over: WARREN BROOK

0.40 MI SW LANGDON TL, Cheshire, NH

Built 2020 Load: 49.4 t ADT: 1,092

I-293 SB OFF RAMP

Good

Over: US 3

NH101/US3/I-293 Intchg, Hillsborough, NH

Built 2006 Load: 49.4 t ADT: 7,841

NH101 WB

Good

Over: US 3

NH101 WB OVER US 3, Hillsborough, NH

Built 2006 Load: 49.4 t ADT: 24,425

NORTH SHORE ROAD

Good

Over: TAYLOR BROOK

2 TNS N. ISLAND POND RD, Rockingham, NH

Built 2020 Load: 49.4 t ADT: 446

NH 26

Good

Over: AKERS POND BROOK

1.0 MI W OF ERROL VILLAGE, Coos, NH

Built 1960 Load: 49.4 t ADT: 971

NH 75

Good

Over: MAD RIVER

.34 MI. FROM JCT. NH 11, Strafford, NH

Built 1900 Load: 49.4 t ADT: 858

I-93 SB

Good

Over: HARVARD BROOK

2.1 MI.NO.WOODSTOCK T/L, Grafton, NH

Built 1985 Load: 49.4 t ADT: 5,711

MILL POND ROAD

Good

Over: LITTLE RIVER

0.4 LEE TL, Rockingham, NH

Built 2009 Load: 49.4 t ADT: 919

Showing 1,951-2,000 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.