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

NH 16

Good

Over: ELLIS RIVER

0.7 MI FROM JACKSON TL, Carroll, NH

Built 1990 Load: 50.8 t ADT: 9,125

CRAWLEY FALLS ROAD

Good

Over: EXETER RIVER

1.6 MI FROM KINGSTON TL, Rockingham, NH

Built 2014 Load: 50.8 t ADT: 546

BOHANNON BRIDGE RD

Good

Over: NISSITISSIT RIVER

0.99 MI FROM MASS. SL, Hillsborough, NH

Built 1940 Load: 50.8 t ADT: 574

SANDOWN ROAD

Good

Over: EXETER RIVER

130FT RTE 107, Rockingham, NH

Built 1998 Load: 50.8 t ADT: 2,168

NH101 EB

Good

Over: I-95

2.0 MI FROM EXETER TL, Rockingham, NH

Built 1999 Load: 50.8 t ADT: 9,219

I-95 SB

Good

Over: TAYLOR RIVER

3.75 MI N of MA S/L, Rockingham, NH

Built 2018 Load: 50.8 t ADT: 42,489

I-95 NB

Good

Over: TAYLOR RIVER

3.75 MI N of MA S/L, Rockingham, NH

Built 2018 Load: 50.8 t ADT: 41,997

NH114

Good

Over: AMEY BROOK

1.17 M. SE WARNER TL, Merrimack, NH

Built 1951 Load: 50.8 t ADT: 3,984

WEST STREET

Good

Over: CALIFORNIA BROOK

0.41MI RTE 10, Cheshire, NH

Built 2005 Load: 50.8 t ADT: 262

I-93 NB

Good

Over: BOG BROOK

1.1 MI FROM PLYMOUTH TL, Grafton, NH

Built 1963 Load: 51.0 t ADT: 10,268

POND ROAD

Good

Over: BEAVER BROOK

0.3MI NH102, Rockingham, NH

Built 1935 Load: 51.1 t ADT: 481

US202 NH 11 SP TPK

Good

Over: CHESTNUT HILL ROAD

2.9 MI S OF MILTON TL, Strafford, NH

Built 1978 Load: 51.1 t ADT: 15,051

US 3

Good

Over: LITTLE RIVER

0.5 MI FROM BETHLEHEM TL, Coos, NH

Built 1990 Load: 51.3 t ADT: 3,142

NH145

Good

Over: CONNECTICUT RIVER

PITTSBURG TL, Coos, NH

Built 2006 Load: 51.3 t ADT: 686

STINSON LAKE ROAD

Good

Over: BROWN BROOK

0.88 MI N RUMNEY TL, Grafton, NH

Built 1900 Load: 51.3 t ADT: 253

FEE TPK NB RAMP

Good

Over: WIECZOREK DR RAMP

0.2 MILES WEST OF TPK, Hillsborough, NH

Built 2011 Load: 51.4 t ADT: 5,733

SECOND NH TPK

Good

Over: BROOK

1.0 MI. ANTRIM TL, Hillsborough, NH

Built 1900 Load: 51.4 t ADT: 710

CHRISTINE LAKE RD

Good

Over: CHRISTINE LAKE OUTLET

0.8 MI N NH 110 VIA INV60, Coos, NH

Built 1940 Load: 51.4 t ADT: 90

THORNTON GORE RD

Good

Over: EASTMAN BROOK

0.3 MI FROM WOODSTOCK TL, Grafton, NH

Built 1988 Load: 51.4 t ADT: 219

MORRILL HILL ROAD

Good

Over: ELBOW BROOK

0.3 MI FR SLEEPER HILL R, Merrimack, NH

Built 2018 Load: 51.6 t ADT: 121

NH 10

Good

Over: CROYDON BRANCH SUGAR R

4.4 MI FROM NEWPORT TL, Sullivan, NH

Built 1935 Load: 51.6 t ADT: 3,480

NH101 WB

Good

Over: I-95

HAMPTON, Rockingham, NH

Built 2000 Load: 51.6 t ADT: 9,219

VT114 MAIN STREET

Good

Over: CONNECTICUT RIVER

AT VERMONT STATE LINE, Coos, NH

Built 1990 Load: 51.6 t ADT: 2,111

HALFMOON POND RD

Good

Over: HALFMOON POND OUTLET

0.55 MI NH 31, Sullivan, NH

Built 2009 Load: 51.6 t ADT: 90

BRADLEY LAKE ROAD

Good

Over: BRADLEY BROOK

2.3 MI FR NH RTE 4, Merrimack, NH

Built 1960 Load: 51.7 t ADT: 90

GREGG LAKE ROAD

Good

Over: GREGG LAKE

TOWN RD, Hillsborough, NH

Built 1997 Load: 51.7 t ADT: 198

I-93 NB

Good

Over: BLAIR ROAD

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

Built 1963 Load: 51.7 t ADT: 10,268

NH 27

Good

Over: BLOODY BROOK

0.6 MI W JCT NH 27/NH101, Rockingham, NH

Built 1998 Load: 51.8 t ADT: 11,517

I-93 SB

Good

Over: NH142

1.4 MI S SUGAR HILL TL, Grafton, NH

Built 1959 Load: 51.8 t ADT: 2,362

I-93 NB

Good

Over: NH142

1.4 MI S SUGARHILL TL, Grafton, NH

Built 1973 Load: 51.8 t ADT: 2,282

TOWLE FARM ROAD

Good

Over: NH101

0.3 MI FROM JCT. RT 95, Rockingham, NH

Built 1995 Load: 51.8 t ADT: 2,192

NH 16

Good

Over: NHNCRR

.88MI S. OSSIPEE T.L., Carroll, NH

Built 1956 Load: 51.8 t ADT: 7,764

I-293 FEE TPK

Good

Over: S BR PISCATAQUOG RIVER

.8 MI BEDFORD TL, Hillsborough, NH

Built 2016 Load: 51.9 t ADT: 62,482

NH152

Good

Over: CSX

.1 MI FROM JCT RT 108, Rockingham, NH

Built 1927 Load: 51.9 t ADT: 8,892

PET SHOP DRIVE

Good

Over: LITTLE RIVER

.75 MI W NH125, Rockingham, NH

Built 2005 Load: 51.9 t

QUAKER CITY ROAD

Good

Over: LITTLE SUGAR RIVER

0.4 MI. ACWORTH TL, Sullivan, NH

Built 1930 Load: 51.9 t ADT: 90

MILTON ROAD

Good

Over: DAMES BROOK

0.60MI NE JCT NH153, Strafford, NH

Built 2002 Load: 52.0 t ADT: 90

TOWN POUND ROAD

Good

Over: BOG BROOK

.7 MI FROM BOG RD, Grafton, NH

Built 2003 Load: 52.1 t ADT: 580

NH 75 CENTRAL ST

Good

Over: COCHECO RIVER

.14 MI. W. JCT. NH 11, Strafford, NH

Built 1985 Load: 52.1 t ADT: 2,919

NORTH GROTON ROAD

Good

Over: COCKERMOUTH RIVER

0.5 MI FROM HEBRON TL, Grafton, NH

Built 1930 Load: 52.1 t ADT: 170

NH 28

Good

Over: I-293 NH101

1.8 MI N LONDONDERRY TL, Hillsborough, NH

Built 1960 Load: 52.1 t ADT: 34,439

SP TPK SB ON RAMP

Good

Over: COCHECO RIVER

.1 MILE SOUTH OF RT. 125, Strafford, NH

Built 2009 Load: 52.1 t ADT: 2,229

SCENIC DRIVE

Good

Over: POOR FARM BROOK

1.3 MI FR BELKNAP POINT, Belknap, NH

Built 1966 Load: 52.2 t ADT: 590

WELCH ROAD

Good

Over: LITTLE RIVER

0.6 MI FR STRAFFORD TL, Belknap, NH

Built 2010 Load: 52.3 t ADT: 90

NH101 WB

Good

Over: PISCASSIC RIVER

1.1MI E NH101/NH125 JCT, Rockingham, NH

Built 1997 Load: 52.3 t ADT: 19,677

NH101 WB

Good

Over: NH125

.41 MI N BRENTWOOD TL, Rockingham, NH

Built 1996 Load: 52.3 t ADT: 23,483

WIECZOREK DR

Good

Over: LITTLE COHAS BROOK

0.5 FROM MHT, Rockingham, NH

Built 2011 Load: 52.3 t ADT: 5,988

I-93 SB

Good

Over: NHRR

4.7 MI PLYMOUTH TL, Grafton, NH

Built 1968 Load: 52.4 t ADT: 9,903

I-393 US 4 US202W

Good

Over: SOUCOOK RIVER

CONCORD PEMBROOK TL, Merrimack, NH

Built 1988 Load: 52.4 t ADT: 7,980

OLD LAKE SHORE RD

Good

Over: GUNSTOCK RIVER

240 FT FR INTERVALE RD, Belknap, NH

Built 1927 Load: 52.4 t ADT: 662

Showing 2,051-2,100 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.