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

FDR 19

Good

Over: JEFFERS BROOK

MAP 35, Grafton, NH

Built 2001 Load: 80.4 t ADT: 50

I-93 NB

Good

Over: CONNECTOR ROAD

0.23 MI N WOODSTOCK TL, Grafton, NH

Built 1973 Load: 80.7 t ADT: 5,375

NH 9

Good

Over: BOYS CAMP ROAD

1.0 MI WEST STODDARD TL, Cheshire, NH

Built 1994 Load: 81.1 t ADT: 6,028

US 4 NH 16 SP TPK

Good

Over: SHAWAYTTUCK

2.5 MI FROM PORTSMOUTH T, Rockingham, NH

Built 1983 Load: 81.6 t ADT: 66,702

MANCHESTER ROAD

Good

Over: BEAVER BROOK

0.5 MI JCT 101, Hillsborough, NH

Built 2015 Load: 81.8 t ADT: 948

WAUKEWAN RD

Good

Over: WAUKEWAN LAKE INLET

NEW HAMPTON T/L, Belknap, NH

Built 2022 Load: 81.8 t ADT: 478

FDR 19

Good

Over: JEFFERS BROOK

MAP 35, Grafton, NH

Built 2001 Load: 83.6 t ADT: 50

HIGH HAITH ROAD

Good

Over: SQUAM LAKE CHANNEL

0.5 MI FR SQUAM LAKE RD, Belknap, NH

Built 2010 Load: 83.9 t ADT: 267

NH 10

Good

Over: ABBOTT BROOK

1.9 MI. FROM GILSUM TL, Cheshire, NH

Built 1964 Load: 84.5 t ADT: 1,841

MALLEGO ROAD

Good

Over: MALLEGO BROOK

0.7 MI FR RTE 125&9, Strafford, NH

Built 2020 Load: 84.7 t ADT: 722

BROAD BROOK ROAD

Good

Over: BROAD BROOK

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

Built 1900 Load: 85.1 t ADT: 90

GRIFFIN ROAD

Good

Over: GRIFFIN BROOK

1/4 MI CENTER HILL RD JCT, Merrimack, NH

Built 2008 Load: 85.3 t ADT: 90

NH 10

Good

Over: ASH SWAMP BROOK

4.3 MI. N. OF NEWPORT TL, Sullivan, NH

Built 1927 Load: 86.0 t ADT: 3,480

STAGE COACH ROAD

Good

Over: BURTON POND OUTLET

TOWN RD, Hillsborough, NH

Built 2021 Load: 86.2 t ADT: 90

NORTH PEMBROKE RD

Good

Over: SOUCOOK RIVER

AT PEMBROKE TL, Merrimack, NH

Built 1959 Load: 86.5 t ADT: 4,598

DEPOT STREET

Good

Over: CONTOOCOOK RIVER

AT BENNINGTON TL, Hillsborough, NH

Built 2013 Load: 87.5 t ADT: 1,970

AREA ROAD

Good

Over: POOR FARM BROOK

0.16 Mi. From NH RTE 11-A, Belknap, NH

Built 2011 Load: 89.0 t ADT: 160

US 3

Good

Over: CARROLL STREAM

3.4 MI S WHITEFIELD T/L, Coos, NH

Built 1957 Load: 89.8 t ADT: 3,070

NH111

Good

Over: SPICKET RIVER

0.3 MI W ATKINSON TL, Rockingham, NH

Built 1978 Load: 89.8 t ADT: 15,832

ELLSWORTH POND RD

Good

Over: ELLSWORTH POND OUTLET

4.9 MI S RUMNEY TL, Grafton, NH

Built 1986 Load: 89.8 t ADT: 69

NH125

Good

Over: NORTH RIVER

0.1 MI. S. JCT. 155, Rockingham, NH

Built 1977 Load: 89.8 t ADT: 16,427

US 3

Good

Over: NHRR(ABD)

3.2 MI FRANKLIN TL, Merrimack, NH

Built 1955 Load: 89.8 t ADT: 9,836

I-89 NH 10 SB

Good

Over: MILLER POND ROAD

4.61 MI SPRINGFIELD T.L., Sullivan, NH

Built 1972 Load: 89.8 t ADT: 10,825

I-89 NH 10 SB

Good

Over: STONY BROOK

5.06 MI SPRINGFIELD TL, Sullivan, NH

Built 1972 Load: 89.8 t ADT: 10,825

KING ROAD

Good

Over: MINK BROOK

1.0 MI FROM GREENSBORO R, Grafton, NH

Built 1973 Load: 89.8 t ADT: 90

NH 12

Good

Over: BEAVER BROOK

.97 MI NW SWANZEY TL, Cheshire, NH

Built 2019 Load: 89.8 t ADT: 19,665

WELLINGTON ROAD

Good

Over: VALLEY BROOK

0.1 MILE W OF NH 28 BYP, Hillsborough, NH

Built 2013 Load: 89.8 t ADT: 13,819

BODWELL ROAD

Good

Over: COHAS BROOK

0.3 MI N LONDONDERRY TL, Hillsborough, NH

Built 1984 Load: 89.8 t ADT: 2,518

NH 16 SP TPK

Good

Over: JONES ACCESS ROAD

6.6 MI N OF ROCHESTER TL, Strafford, NH

Built 1980 Load: 89.8 t ADT: 14,303

NH 33

Good

Over: CSX

0.75 MI FROM JCT I-95, Rockingham, NH

Built 2010 Load: 89.8 t ADT: 15,705

US 2

Good

Over: MOOSE RIVER

3.6 MI FROM JEFFERSON TL, Coos, NH

Built 1966 Load: 89.8 t ADT: 5,144

NH 16 SP TPK

Good

Over: AXEHANDLE BROOK

1.2 MI FROM JCT. RT 202A, Strafford, NH

Built 1957 Load: 89.8 t ADT: 28,210

I-93 REST EXIT

Good

Over: POLICY BROOK

REST AREA EXIT ROAD, Rockingham, NH

Built 1967 Load: 89.8 t ADT: 1,800

I-93 REST ENTRANCE

Good

Over: POLICY BROOK

REST AREA ENTRANCE ROAD, Rockingham, NH

Built 1967 Load: 89.8 t ADT: 1,800

US 3

Good

Over: STRATFORD BOG BROOK

0.9 MI NORTHUMBERLAND TL, Coos, NH

Built 2001 Load: 89.8 t ADT: 2,993

I-93 NB

Good

Over: INDIAN CREEK

0.9 MI FRANCONIA TL, Grafton, NH

Built 1972 Load: 89.8 t ADT: 2,684

NH 16

Good

Over: CHOCORUA RIVER

7.1 MI FROM OSSIPEE T.L., Carroll, NH

Built 1939 Load: 89.8 t ADT: 7,428

NH 25 NH113

Good

Over: SANGER BROOK

3.4 MI FROM OSSIPEE TL, Carroll, NH

Built 1986 Load: 89.8 t ADT: 5,018

MILL BROOK ROAD

Good

Over: MILL BROOK

20 WEST OF BR. #165/151, Grafton, NH

Built 2019 Load: 89.8 t ADT: 90

HIGH STREET

Good

Over: MELVIN RIVER

0.2 MI. RTE.109, Carroll, NH

Built 1977 Load: 89.8 t ADT: 263

POOCHAM ROAD

Good

Over: OX BROOK

2.35 MI CHESTERFLD TL, Cheshire, NH

Built 1984 Load: 89.8 t ADT: 90

RIVER ROAD

Good

Over: OX BROOK

1.8 Mi Fr. NH 63, Cheshire, NH

Built 1986 Load: 89.8 t ADT: 362

NH 12

Good

Over: WHITE BRIDGE BROOK

1.3 MI SURRY TL, Cheshire, NH

Built 1941 Load: 89.8 t ADT: 6,382

OLD NH110

Good

Over: UPPER AMMONOOSUC RIVER

0.22 MI. STARK TL, Coos, NH

Built 2020 Load: 95.4 t ADT: 163

OLD ROUTE 3A

Good

Over: SMITH RIVER

3.54 KM S OF BRISTOL, Grafton, NH

Built 1926 Load: 97.2 t ADT: 50

DEPOT STREET

Good

Over: RELIEF

0.07MI BENNINGTON TL, Hillsborough, NH

Built 2013 Load: 99.9 t ADT: 985

I-93 EBS RAMP

Good

Over: COHAS BROOK

1.6 MI E JCT RTE 28, Hillsborough, NH

Built 1962 Load: 99.9 t ADT: 14,269

GOFFS FALLS ROAD

Good

Over: CSX(ABD)

0.3 MI WEST JCT NH 28, Hillsborough, NH

Built 2021 Load: 99.9 t ADT: 4,456

I-93 NB

Good

Over: COHAS BROOK

.4MI N LONDONDERRY T.L., Hillsborough, NH

Built 1962 Load: 99.9 t ADT: 37,900

SAND HILL ROAD

Good

Over: BROOK

1.4 MI. CROYDON TL, Sullivan, NH

Built 1984 Load: 99.9 t ADT: 156

Showing 2,301-2,350 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.