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 SP TPK SB

Good

Over: COCHECO RIVER

0.2 MI N JCT RT 11, Strafford, NH

Built 2012 Load: 46.4 t ADT: 8,922

NH 16 SP TPK NB

Good

Over: COCHECO RIVER

1.2 MI FROM JCT RT 16, Strafford, NH

Built 2012 Load: 46.4 t ADT: 13,180

NH119

Good

Over: ASHUELOT RIVER

.1 MI. FROM JCT. NH 10, Cheshire, NH

Built 1962 Load: 46.4 t ADT: 3,594

VERRY BROOK ROAD

Good

Over: WHEELOCK BROOK

0.8 MI FR SWANZEY TL, Cheshire, NH

Built 2007 Load: 46.4 t ADT: 90

CHESTER TURNPIKE

Good

Over: NH101

0.4 MI AUBURN TL, Rockingham, NH

Built 1984 Load: 46.5 t ADT: 538

FREMONT ROAD

Good

Over: EXETER RIVER

1.3MI. FREMONT TL, Rockingham, NH

Built 1988 Load: 46.5 t ADT: 801

BROOK STREET

Good

Over: CATSBANE BROOK

0.38 MI. NW JCT. NH 9, Cheshire, NH

Built 1950 Load: 46.5 t ADT: 554

US 3 FEE TPK SB

Good

Over: NASHUA RIVER

0.2 MI FROM SERVICE RD, Hillsborough, NH

Built 1959 Load: 46.5 t ADT: 68,668

NH101 EB

Good

Over: LAMPREY RIVER

4.7MI E OF CANDIA TL, Rockingham, NH

Built 1983 Load: 46.5 t ADT: 20,902

US202 NH 16 SP TPK

Good

Over: NH202A (WALNUT STREET)

1.0 MI FROM JCT RT 11, Strafford, NH

Built 1957 Load: 46.5 t ADT: 20,334

NH 16 SP TPK

Good

Over: COCHECO RIVER

1.0 MI FROM RT 16, Strafford, NH

Built 2010 Load: 46.5 t ADT: 25,146

NH123

Good

Over: WARREN BROOK

3.16 MI. SE JCT. NH 123-A, Cheshire, NH

Built 2006 Load: 46.6 t ADT: 1,253

CHARCOAL ROAD

Good

Over: CHARCOAL BROOK

0.7 MI. RTE 101, Cheshire, NH

Built 2016 Load: 46.6 t ADT: 90

SARGENT HILL ROAD

Good

Over: SMITH RIVER

0.67 MI. DANBURY TL, Grafton, NH

Built 2003 Load: 46.7 t ADT: 90

NEW BOSTON ROAD

Good

Over: POWWOW RIVER

0.6 MI FR NH RTE 117, Rockingham, NH

Built 2009 Load: 46.7 t ADT: 2,235

HIGH STREET

Good

Over: NORTH RIVER

0.6 MI. TL EPPING, Strafford, NH

Built 2012 Load: 46.7 t ADT: 161

OLD GREENFIELD RD

Good

Over: BOGLIE BROOK

2.05 MI FR GREENFIELD TL, Hillsborough, NH

Built 2008 Load: 46.7 t ADT: 313

RIVER ROAD

Good

Over: SUNCOOK RIVER

.8 MI. FROM N.H. RTE.140, Belknap, NH

Built 2004 Load: 46.8 t ADT: 90

NH114

Good

Over: STOCKER BROOK

.1 MI. EAST OF JCT. NH 10, Sullivan, NH

Built 1941 Load: 46.8 t ADT: 1,519

PLEASANT VALLEY RD

Good

Over: OTTER BROOK

AT LOST NATION INV. 51, Coos, NH

Built 2004 Load: 46.8 t ADT: 90

I-89(RAMP D)

Good

Over: TURKEY RIVER

BOW INTERCHANGE, Merrimack, NH

Built 1987 Load: 46.9 t ADT: 9,929

NH112 LOST RIV RD

Good

Over: BLACK BROOK

0.8 MI N.W.WOODSTOCK T.L., Grafton, NH

Built 2004 Load: 46.9 t ADT: 1,652

I-89 NB

Good

Over: CONTOOCOOK RIVER

1.2 MI N.W. JCT 127, Merrimack, NH

Built 1967 Load: 46.9 t ADT: 11,367

NH101 EB

Good

Over: NH108

.4 MI FROM EXETER TL, Rockingham, NH

Built 1999 Load: 46.9 t ADT: 20,528

NH101 WB

Good

Over: NH108

STRATHAM, Rockingham, NH

Built 2000 Load: 46.9 t ADT: 20,643

NORTH VILLAGE ROAD

Good

Over: SILVER BROOK

3.8 MI FR HENNIKER TL, Merrimack, NH

Built 2011 Load: 46.9 t ADT: 90

PLACES MILL ROAD

Good

Over: SUNSET LAKE OUTLET

0.4 GILMANTON TL, Belknap, NH

Built 2011 Load: 47.0 t ADT: 90

I-93 SB

Good

Over: US 3 NH 25

0.8 MI NEW HAMPTON T/L, Grafton, NH

Built 1963 Load: 47.0 t ADT: 10,610

NH101 EB

Good

Over: PINE ROAD

.2 MI EAST OF EXETER TL, Rockingham, NH

Built 1997 Load: 47.0 t ADT: 21,071

JUNIPER HILL ROAD

Good

Over: BRENNAN BROOK

TOWN RD, Hillsborough, NH

Built 2015 Load: 47.0 t ADT: 90

WESTERN AVE

Good

Over: CONTOOCOOK RIVER

2.7 MI FR HILLSBOROUGH T, Merrimack, NH

Built 2017 Load: 47.0 t ADT: 543

I-89 NB

Good

Over: NH 12A

0.5 MI FROM VT. S.L., Grafton, NH

Built 2012 Load: 47.0 t ADT: 18,913

THORNTON ROAD

Good

Over: PENNICHUCK BROOK

NASHUA/MERR TL, Hillsborough, NH

Built 2001 Load: 47.0 t ADT: 1,203

US 3 FEE TPK SB

Good

Over: SPIT BROOK ROAD

.5 MI FROM MASS S.L., Hillsborough, NH

Built 1995 Load: 47.0 t ADT: 45,069

US 3 FEE TPK NB

Good

Over: SPIT BROOK ROAD

0.5 MI FROM MASS SL., Hillsborough, NH

Built 1993 Load: 47.0 t ADT: 45,069

SUTTON ROAD

Good

Over: RING BROOK

0.2 MI. RTE. 103, Merrimack, NH

Built 2011 Load: 47.0 t ADT: 448

LOWER ASHBY ROAD

Good

Over: SOUHEGAN RIVER

0.2 MI FR NH RTE 123A, Hillsborough, NH

Built 2006 Load: 47.0 t ADT: 1,214

BROOKSIDE DRIVE

Good

Over: LION BROOK

600FT UPSTREAM OF 132/064, Merrimack, NH

Built 2020 Load: 47.0 t ADT: 90

HORACE GREELEY RD

Good

Over: JOE ENGLISH BROOK

2.2 MI BEDFORD TL, Hillsborough, NH

Built 1989 Load: 47.2 t ADT: 2,016

US 3

Good

Over: GALE RIVER

2.0 MI FROM FRANCONIA TL, Grafton, NH

Built 1990 Load: 47.2 t ADT: 5,754

NH101 WB

Good

Over: PINE ROAD

.2 MI EAST EXETER TL., Rockingham, NH

Built 1997 Load: 47.2 t ADT: 20,611

GOOSE POND ROAD

Good

Over: GOOSE POND BROOK

2.9 MI FROM HANOVER TL, Grafton, NH

Built 1991 Load: 47.2 t ADT: 815

NH 9

Good

Over: CATSBANE BROOK

2.5 MI FROM VT SL, Cheshire, NH

Built 1937 Load: 47.2 t ADT: 10,673

WEST DEERING ROAD

Good

Over: CONTOOCOOK RIVER

ANTRIM TL, Hillsborough, NH

Built 2010 Load: 47.2 t ADT: 796

NH101 EB

Good

Over: BLOODY BROOK

0.3MI W NH 27 OVERPASS, Rockingham, NH

Built 1998 Load: 47.2 t ADT: 21,071

STAGE ROAD

Good

Over: SUNCOOK RIVER

TOWN RD., Belknap, NH

Built 1992 Load: 47.2 t ADT: 1,155

NH137

Good

Over: MOOSE BROOK

1.1 MI W JCT US202, Hillsborough, NH

Built 1939 Load: 47.2 t ADT: 1,235

US202 NH 9

Good

Over: RUSH ROAD

.5 MI E. JCT. RT 114, Merrimack, NH

Built 1962 Load: 47.2 t ADT: 15,572

US302 NH 10

Good

Over: I-93

2.4 MI BETHLEHEM TL, Grafton, NH

Built 1960 Load: 47.2 t ADT: 14,948

I-293 EB NH101

Good

Over: FRONTAGE RD CSX(ABD)

0.6MI E JCT RTE 3A, Hillsborough, NH

Built 1958 Load: 47.2 t ADT: 40,972

Showing 1,851-1,900 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.