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

PRESCOTT ROAD

Good

Over: LAMPREY RIVER

0.07 MI FR RIVERSIDE DR, Rockingham, NH

Built 1990 Load: 40.8 t ADT: 819

SPAULDING AVENUE

Good

Over: SALMON FALLS RIVER

MAINE SL, Strafford, NH

Built 1990 Load: 40.8 t ADT: 990

NH125

Good

Over: AXE HANDLE BROOK

.1 MI FROM JCT SP. TPK., Strafford, NH

Built 1983 Load: 40.8 t ADT: 16,118

STINSON LAKE ROAD

Good

Over: STINSON BROOK

3.2 MI N OF JCT RTE 25, Grafton, NH

Built 1948 Load: 40.8 t ADT: 840

BROOKDALE ROAD

Good

Over: I-93

4 MI S WINDHAM TL, Rockingham, NH

Built 2012 Load: 40.8 t ADT: 1,099

I-93 SB

Good

Over: NH 38

2.0 ML N. OF MASS SL., Rockingham, NH

Built 2013 Load: 40.8 t ADT: 45,625

BLACK BROOK ROAD

Good

Over: BLACK BROOK

0.1 MI FROM LOWER BAY RD, Belknap, NH

Built 2013 Load: 40.8 t ADT: 90

BELL HILL ROAD

Good

Over: UPPER AMMONOOSUC RIVER

.06 MI FROM NH110, Coos, NH

Built 1990 Load: 40.8 t ADT: 90

DEWEY HILL ROAD

Good

Over: PHILLIPS BROOK

0.5 MI FR DUMMER TL, Coos, NH

Built 1996 Load: 40.8 t ADT: 43

TREATMENT ROAD

Good

Over: SUGAR RIVER

0.06 MI N NH 11, Sullivan, NH

Built 2009 Load: 40.8 t ADT: 90

I-93 SB

Good

Over: MERRILL ACCESS RD

3.9 MI CAMPTON TL, Grafton, NH

Built 1969 Load: 40.8 t ADT: 7,156

I-93 NB

Good

Over: MERRILL ACCESS RD

3.8 MI CAMPTON TL, Grafton, NH

Built 1969 Load: 40.8 t ADT: 6,997

US 3 NH 11 NH132

Good

Over: I-93

.1 MI WINNIPESAUKEE RIVER, Belknap, NH

Built 2000 Load: 40.8 t ADT: 22,764

VALLEY ROAD

Good

Over: HIGHLAND LAKE INLET

150 SOUTHEAST OF COVE RO, Sullivan, NH

Built 2015 Load: 40.8 t ADT: 90

DOLE SCHOOL HS RD

Good

Over: HIGHLAND LAKE OUTLET

0.09MI NH 31, Sullivan, NH

Built 2012 Load: 40.8 t ADT: 90

ABIJAH BRIDGE ROAD

Good

Over: DUDLEY BROOK

0.11 MI FROM DEERING TL, Hillsborough, NH

Built 1999 Load: 40.8 t ADT: 90

THAYER MTN ROAD

Good

Over: S BRANCH BAKER RIVER

.09 MI FR NO DORCHESTER, Grafton, NH

Built 1999 Load: 40.8 t ADT: 90

SOUTH VILLAGE ROAD

Good

Over: MILL BROOK

0.02MI. RTE 12, Cheshire, NH

Built 2015 Load: 40.8 t ADT: 1,077

KEYES HILL ROAD

Good

Over: BLOOD BROOK

0.58MI TEMPLE TL, Hillsborough, NH

Built 1999 Load: 40.8 t ADT: 186

I-93 NB

Good

Over: NORTH LOWELL ROAD

.6 MI S OF DERRY TL, Rockingham, NH

Built 1998 Load: 40.8 t ADT: 40,201

NH111

Good

Over: HARRIS RD FLATROCK BK

0.5MI EAST NH 28, Rockingham, NH

Built 2007 Load: 40.8 t ADT: 18,190

CHESLEY HILL ROAD

Good

Over: AXE HANDLE BROOK

CITY ST, Strafford, NH

Built 2008 Load: 41.0 t ADT: 566

BIRCHDALE ROAD

Good

Over: WHITE BROOK

1.25 MI SE JCT NH 13, Merrimack, NH

Built 2018 Load: 41.2 t ADT: 459

JEFFERSON NOTCH RD

Good

Over: AMMONOOSUC RIVER

.4MIJCT 42 + 44, Coos, NH

Built 1982 Load: 41.2 t ADT: 90

CAMPGROUND ROAD

Good

Over: MOOSE BROOK

.25 MI S JIM TOWN ROAD, Coos, NH

Built 1964 Load: 41.2 t

RUDDSBORO ROAD

Good

Over: MINK BROOK

4.2 MI FR LEBANON TL, Grafton, NH

Built 1940 Load: 41.2 t ADT: 90

I-93 SB

Good

Over: US 3

0.9 MI FROM HOLDERNESS TL, Grafton, NH

Built 1964 Load: 41.2 t ADT: 10,181

I-93 NB

Good

Over: US 3

0.9 MI FROM HOLDERNESS TL, Grafton, NH

Built 1964 Load: 41.2 t ADT: 10,268

US 3

Good

Over: KIMBALL BROOK

8.5 MI TO NORTHUMBERLAND, Coos, NH

Built 1956 Load: 41.2 t ADT: 2,621

STEELE BRIDGE ROAD

Good

Over: MILL BROOK

190 FT FROM MILLBROOK RD, Grafton, NH

Built 2003 Load: 41.2 t ADT: 90

I-93 SB

Good

Over: NH111

3 MI SOUTH OF DERRY TL, Rockingham, NH

Built 2014 Load: 41.2 t ADT: 40,312

MERIDEN HILL ROAD

Good

Over: LYMAN BROOK

0.7 MI FROM US RTE 3, Coos, NH

Built 2014 Load: 41.3 t ADT: 134

BRIDGE HILL ROAD

Good

Over: CONNECTICUT RIVER

NH-VT STATE LINE, Coos, NH

Built 1997 Load: 41.3 t ADT: 857

NH 9

Good

Over: BMRR

2 MI. FROM MADBURY TL6, Strafford, NH

Built 2011 Load: 41.3 t ADT: 11,839

COURT STREET

Good

Over: ASHUELOT RIVER

2.3 MI FROM KEENE CENTER, Cheshire, NH

Built 2010 Load: 41.3 t ADT: 8,625

COLD RIVER ROAD

Good

Over: GREAT BROOK

0.5MI WALPOLE TL, Sullivan, NH

Built 1982 Load: 41.3 t ADT: 90

BRAEMOOR WOODS RD

Good

Over: SPICKET RIVER TRIBUTARY

4 TENTHS MIL EAST NH 28, Hillsborough, NH

Built 2006 Load: 41.4 t ADT: 446

WASHBURN ROAD

Good

Over: MOHAWK RIVER

110 FT FROM NH RTE 26, Coos, NH

Built 1920 Load: 41.5 t ADT: 90

BRADFORD STREET

Good

Over: TRIBUTARY G

DERRY, Rockingham, NH

Built 2006 Load: 41.5 t ADT: 989

WHITTIER STREET

Good

Over: COCHECO RIVER

OFF DOWNTOWN DOVER, Strafford, NH

Built 2018 Load: 41.5 t ADT: 4,293

CROSS ROAD

Good

Over: GUNNISON BROOK

AT JCT OF BROOK RD, Sullivan, NH

Built 2013 Load: 41.5 t ADT: 90

US302

Good

Over: SAWYER RIVER

1.8 MI FROM BARTLETT TL, Carroll, NH

Built 2013 Load: 41.5 t ADT: 2,768

BEDFORD ROAD

Good

Over: FEE TPK

1.8 MI BEDFORD T.L., Hillsborough, NH

Built 1990 Load: 41.5 t ADT: 10,814

FEE TPK NB OFFRAMP

Good

Over: FEE TPK SB OFF RAMP

1/8 MI WEST OF D W HYW., Hillsborough, NH

Built 2000 Load: 41.5 t ADT: 9,252

NH123 NH124

Good

Over: SOUHEGAN RIVER BYP HIST

1.4 MI FROM GREENVILLE TL, Hillsborough, NH

Built 2015 Load: 41.5 t ADT: 5,402

US 1 SCOTT AVENUE

Good

Over: DANIEL STREET

0.1 MI SOUTH MAINE-NH SL, Rockingham, NH

Built 1921 Load: 41.5 t ADT: 13,887

I-93 NB

Good

Over: NH111A

.2 M EAST OF ARMSTRONG RD, Rockingham, NH

Built 2011 Load: 41.5 t ADT: 50,799

FDR 34

Good

Over: WHITEFACE BROOK

MAP 32, Carroll, NH

Built 2005 Load: 41.5 t ADT: 50

COFFIN BROOK ROAD

Good

Over: COFFIN BROOK

1.0 MI NH 140, Belknap, NH

Built 1999 Load: 41.6 t ADT: 90

FAIRGROUNDS ROAD

Good

Over: WEST BRANCH BROOK

0.03 MI FR JOHNSON HILL R, Merrimack, NH

Built 2003 Load: 41.6 t ADT: 90

Showing 1,551-1,600 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.