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

I-293 FEE TPK

Good

Over: N BR PISCATAQUOG RIVER

.3 MI SECOND ST, Hillsborough, NH

Built 2016 Load: 55.0 t ADT: 67,263

I-89 NH 10 SB

Good

Over: HARDY HILL ROAD

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

Built 1966 Load: 55.1 t ADT: 16,350

I-89 NH 10 NB

Good

Over: HARDY HILL ROAD

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

Built 1966 Load: 55.1 t ADT: 15,942

BEAN ROAD

Good

Over: BABOOSIC BROOK

365 FT FR PROFILE DRIVE, Hillsborough, NH

Built 2016 Load: 55.1 t ADT: 1,132

NH 25C

Good

Over: EASTMAN BROOK

2.51 MI. NW OF WARREN TL, Grafton, NH

Built 1936 Load: 55.1 t ADT: 442

TASKER HILL ROAD

Good

Over: PEQUAWKET POND

IN CONWAY VILLAGE, Carroll, NH

Built 2010 Load: 55.2 t ADT: 90

STAGE ROAD

Good

Over: NIGHTHAWK HOLLOW BROOK

TOWN RD., Belknap, NH

Built 2021 Load: 55.2 t ADT: 1,214

BEDFORD ROAD

Good

Over: BABOOSIC BROOK

1.7 MI FR BEDFORD TL, Hillsborough, NH

Built 2020 Load: 55.2 t ADT: 7,152

NH135

Good

Over: JOHNS RIVER

4.8 MI FROM LITTLETON TL, Coos, NH

Built 1997 Load: 55.3 t ADT: 937

I-89 NB

Good

Over: GILE POND ROAD

3.7MI NEW LONDON T.L., Merrimack, NH

Built 1967 Load: 55.3 t ADT: 9,150

LYNDEBOROUGH ROAD

Good

Over: S BR PISCATAQUOG RIVER

0.4 MI FR BUTTERFIELD RD, Hillsborough, NH

Built 2010 Load: 55.5 t ADT: 90

SULLIVAN DRIVE

Good

Over: MILL BROOK

0.19 MI FR MILLBROOK RD, Grafton, NH

Built 1986 Load: 55.5 t ADT: 90

OLD NO BRANCH ROAD

Good

Over: NORTH BRANCH RIVER

0.1MI. NH9, Hillsborough, NH

Built 2011 Load: 55.7 t ADT: 39

NH115A

Good

Over: CHERRY MILL BROOK

3.6 MI FROM JCT RTE 2, Coos, NH

Built 1936 Load: 55.9 t ADT: 514

NH 9

Good

Over: OTTER BROOK

0.5 MI SW TO ROXBURY TL, Cheshire, NH

Built 2020 Load: 55.9 t ADT: 7,791

I-89 SB

Good

Over: SILK FARM ROAD

.5 MI N. OF JCT. RT. 13, Merrimack, NH

Built 1959 Load: 56.0 t ADT: 19,953

I-89 NB

Good

Over: SILK FARM ROAD

.5 MI NW OF JCT RT 13, Merrimack, NH

Built 1959 Load: 56.0 t ADT: 19,586

NH114

Good

Over: STOCKER POND OUTLET

.67 MI. SW SPRINGFIELD TL, Sullivan, NH

Built 1934 Load: 56.0 t ADT: 701

PADDY ACRE ROAD

Good

Over: BROOK

0.14 MI FR MOULTONVILLE, Carroll, NH

Built 2017 Load: 56.0 t ADT: 90

I-89 NB

Good

Over: COUNTY ROAD

2.2 MI FROM SUTTON T.L., Merrimack, NH

Built 1967 Load: 56.2 t ADT: 9,607

CEDAR STREAM ROAD

Good

Over: DEAD WATER STREAM

TOWN RD, Coos, NH

Built 2004 Load: 56.3 t ADT: 90

I-93 SB

Good

Over: STONEHENGE ROAD

1.0 MI SO JCT RT 28, Rockingham, NH

Built 1996 Load: 56.3 t ADT: 36,875

WOODBURY AVENUE

Good

Over: SP TPK US 4 NH 16

0.8 MI FR PISCATAQUA DR, Rockingham, NH

Built 2015 Load: 56.3 t ADT: 10,544

I-89 NB

Good

Over: NH 13

1.4 MI NW OF BOW T.L., Merrimack, NH

Built 1959 Load: 56.5 t ADT: 19,586

NH112 KANCAMAGUS

Good

Over: HOBBS BROOK

3.3 MI FROM CONWAY TL, Carroll, NH

Built 1990 Load: 56.7 t ADT: 1,855

THRASHER ROAD

Good

Over: RED WATER BROOK

1.4MI NH12, Sullivan, NH

Built 1900 Load: 56.7 t ADT: 567

STAGE ROAD

Good

Over: BROOK

0.25MI LOUDON TL, Belknap, NH

Built 2021 Load: 56.7 t ADT: 824

CROSS ROAD

Good

Over: PEMIGEWASSET RIVER

0.18 MI. E. OF JCT US 3, Grafton, NH

Built 1973 Load: 56.7 t ADT: 764

BARTON ROAD

Good

Over: EASTMAN BROOK

50FT. RTE.25C, Grafton, NH

Built 2011 Load: 56.8 t ADT: 90

NH 12A

Good

Over: BLOW-ME-DOWN BROOK

1.6MI. FROM PLAINFIELD TL, Sullivan, NH

Built 1959 Load: 57.0 t ADT: 2,737

STEVENS ROAD

Good

Over: MINK BROOK

1.3 MI N LEBANON TL, Grafton, NH

Built 1973 Load: 57.1 t ADT: 90

HORACE GREELEY RD

Good

Over: PULPIT BROOK

0.1 MI BEDFORD TL, Hillsborough, NH

Built 2018 Load: 57.2 t ADT: 776

COHAS AVENUE

Good

Over: COHAS BROOK

0.8 MI S ISLAND POND RD, Hillsborough, NH

Built 1900 Load: 57.2 t ADT: 2,502

NH 3A

Good

Over: WILDLIFE STREAM

0.1 MI. SOUTH OF MAAR, Hillsborough, NH

Built 2011 Load: 57.2 t ADT: 10,060

NH 16

Good

Over: PINE RIVER

2.8 MI FROM WAKEFIELD TL, Carroll, NH

Built 1976 Load: 57.2 t ADT: 7,426

NEW HEBRON ROAD

Good

Over: CLAY BROOK

0.3 MI FROM TEXAS RD., Grafton, NH

Built 2002 Load: 57.2 t ADT: 189

I-95 NB

Good

Over: WOODBURY AVENUE

E. SP TPKE I-95 INTERCH., Rockingham, NH

Built 1970 Load: 57.2 t ADT: 33,905

BRACKETT ROAD

Good

Over: BERRY BROOK

.07 MI. SW JCT. 1-A, Rockingham, NH

Built 1986 Load: 57.2 t ADT: 1,635

I-293 NB OFF RAMP

Good

Over: I-293 NH 3A FEE TPK

1.5 E JCT RT 28, Hillsborough, NH

Built 2016 Load: 57.3 t ADT: 5,352

NH101 WB

Good

Over: NH111

.2 mi Hampton TL, Rockingham, NH

Built 2000 Load: 57.5 t ADT: 22,676

MILLER POND ROAD

Good

Over: SKINNER BROOK

TOWN RD, Sullivan, NH

Built 1964 Load: 57.8 t ADT: 90

US302

Good

Over: NANCY BROOK

8.3 MI CARROLL TL, Carroll, NH

Built 1978 Load: 57.8 t ADT: 2,768

STINSON LAKE ROAD

Good

Over: SUCKER BROOK

.06 MI. N. OF RUMNEY TL, Grafton, NH

Built 1900 Load: 58.0 t ADT: 253

RIVERSIDE DRIVE

Good

Over: STONY BROOK

.21 MI. FROM JCT. US 4, Grafton, NH

Built 1997 Load: 58.0 t ADT: 1,683

OLD TEMPLE ROAD

Good

Over: STONY BROOK

1.6 MI FR TEMPLE TL, Hillsborough, NH

Built 2005 Load: 58.0 t ADT: 206

I-93 NB

Good

Over: EASTMAN BROOK

2.51 MI THORNTON TL, Grafton, NH

Built 1972 Load: 58.0 t ADT: 6,913

RUSSELL STATION RD

Good

Over: RAND BROOK

1.9MI LYNDEBORO TL, Hillsborough, NH

Built 2011 Load: 58.1 t ADT: 119

SPUR ROAD

Good

Over: STRATFORD BOG BROOK

0.4 MI N JCT US 3, Coos, NH

Built 1984 Load: 58.2 t ADT: 116

RUSSELL HILL ROAD

Good

Over: BLOOD BROOK

ADJACENT TO 101, Hillsborough, NH

Built 2003 Load: 58.2 t ADT: 90

I-95 SB

Good

Over: WOODBURY AVENUE

E SP. TPKE-I-95 INTERCH., Rockingham, NH

Built 1970 Load: 58.3 t ADT: 35,081

Showing 2,151-2,200 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.