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

NH110

Good

Over: JERICHO BROOK

3.3 MI JCT NH 110 & NH 16, Coos, NH

Built 1954 Load: 36.2 t ADT: 1,878

STILLWATER CIRCLE

Good

Over: BROOK

600FT S JCT FLAGG RD, Strafford, NH

Built 1988 Load: 36.2 t ADT: 780

US302

Good

Over: DECEPTION BROOK

3.6 MI E. JCT US3, Coos, NH

Built 1974 Load: 36.3 t ADT: 3,804

NH101

Good

Over: GOLDMINE ROAD

0.6 MI PETERBOROUGH TL, Cheshire, NH

Built 1967 Load: 36.3 t ADT: 6,746

BOROUGH ROAD

Good

Over: SMITH RIVER

AT BRISTOL T/L, Merrimack, NH

Built 2010 Load: 36.3 t ADT: 90

NH152

Good

Over: NORTH RIVER

0.1 MI NOTTINGHAM TL, Strafford, NH

Built 1928 Load: 36.3 t ADT: 2,873

I-93 SB

Good

Over: I-293 EBN

1.4 MI E JCT NH 28, Hillsborough, NH

Built 1961 Load: 36.3 t ADT: 25,680

DOLLY COPP ROAD

Good

Over: PEABODY RIVER

.46 MI. S. GORHAM T.L., Coos, NH

Built 1950 Load: 36.3 t ADT: 437

TRICNIT ROAD

Good

Over: FURNACE BROOK

0.1 MI FR NH RTE 124, Hillsborough, NH

Built 2009 Load: 36.3 t ADT: 453

VALLEY ROAD

Good

Over: DAN HOLE RIVER

0.11 MI FR MOULTONVILLE, Carroll, NH

Built 2018 Load: 36.3 t ADT: 90

US 4 NH 16 TPK SB

Good

Over: LITTLE BAY RD

DOVER-NEWINGTON T.L., Strafford, NH

Built 2018 Load: 36.6 t ADT: 33,175

NH111

Good

Over: CSX

3.04MI NW JCT 1-A, Rockingham, NH

Built 1927 Load: 36.6 t ADT: 4,335

NH101

Good

Over: BLOOD BROOK

1.6 MI FROM WILTON TL, Hillsborough, NH

Built 1930 Load: 36.6 t ADT: 7,557

NH115A

Good

Over: PRISCILLA BROOK

1.8 MI S JCT US 2, Coos, NH

Built 1967 Load: 36.7 t ADT: 819

NH 63

Good

Over: PARTRIDGE BROOK

2.0 MI FM CHESTERFIELD TL, Cheshire, NH

Built 1969 Load: 36.7 t ADT: 1,594

OAK HILL ROAD

Good

Over: GRAFTON POND OUTLET

AT GRAFTON RD INTER., Grafton, NH

Built 2023 Load: 36.9 t ADT: 90

MILL STREET

Good

Over: LAMPREY RIVER

TOWN RD, Rockingham, NH

Built 2004 Load: 36.9 t ADT: 1,112

GARDEN ROAD

Good

Over: LITTLE RIVER

0.5 MI. RTE.125, Rockingham, NH

Built 2010 Load: 36.9 t ADT: 1,856

NH 43 NH107

Good

Over: LAMPREY RIVER

6.0 MI FROM RAYMOND TL, Rockingham, NH

Built 1984 Load: 37.1 t ADT: 6,447

EAST SIDE RIVER RD

Good

Over: CHICKWOLNEPY STREAM

1.7 MI S DUMMER TL, Coos, NH

Built 1950 Load: 37.1 t ADT: 261

US 2

Good

Over: PEABODY RIVER

4.8 MI FROM RANDOLPH TL, Coos, NH

Built 1982 Load: 37.2 t ADT: 4,291

NH 9

Good

Over: CONRAD ROAD

0.3 MI EAST SULLIVAN TL, Cheshire, NH

Built 1994 Load: 37.2 t ADT: 7,186

BRIDGE STREET

Good

Over: SUNCOOK RIVER

0.3 MI FROM NH RTE 107, Merrimack, NH

Built 1909 Load: 37.2 t ADT: 90

NH101 WB

Good

Over: MAIN STREET

4.2MI E OF CANDIA TL, Rockingham, NH

Built 1982 Load: 37.2 t ADT: 20,577

RIVERDALE ROAD

Good

Over: PISCATAQUOG RIVER

320 FT FR NEW BOSTON TL, Hillsborough, NH

Built 1940 Load: 37.2 t ADT: 627

NH 12A

Good

Over: GREAT BROOK

1.0 MI FROM CHARLESTOWN T, Sullivan, NH

Built 1949 Load: 37.6 t ADT: 943

CROSS STREET

Good

Over: I-93

1.2 MI N OF MASS SL, Rockingham, NH

Built 2007 Load: 37.6 t ADT: 6,750

US 3 NH 11

Good

Over: WINNISQUAM LAKE

SANBORNTON-BELMONT TL, Belknap, NH

Built 1973 Load: 37.6 t ADT: 16,081

I-93 NB

Good

Over: NH132

2.5MI S. TILTON T.L., Merrimack, NH

Built 1959 Load: 37.7 t ADT: 17,977

US 1 BYPASS

Good

Over: PISCATAQUA RIVER RR

MAINE STATELINE, Rockingham, NH

Built 2017 Load: 37.8 t ADT: 10,864

NORTH RIVER ROAD

Good

Over: SOUHEGAN RIVER

300 FT. JCT 101, Hillsborough, NH

Built 1992 Load: 37.9 t ADT: 6,598

US 1

Good

Over: PISCATAQUA RIVER

NH-MAINE SL, Rockingham, NH

Built 1921 Load: 37.9 t ADT: 9,258

NH112

Good

Over: PINE BEND BROOK

1.0 MI NW WATERVILLE T.L., Grafton, NH

Built 1948 Load: 38.0 t ADT: 5,273

OLD CONCORD ROAD

Good

Over: GRANITE LAKE OUTLET

0.4 MI FROM NELSON TL, Cheshire, NH

Built 1932 Load: 38.0 t ADT: 180

I-93 NB

Good

Over: NH111

0.2 EAST OF WYMAN ROAD, Rockingham, NH

Built 2011 Load: 38.0 t ADT: 40,201

FARR ROAD

Good

Over: CATSBANE BROOK

TOWN RD, Cheshire, NH

Built 1955 Load: 38.1 t ADT: 90

STEELE ROAD

Good

Over: NUBANUSIT BROOK

70 FT FR BRIGGS ST NO 23, Hillsborough, NH

Built 2000 Load: 38.1 t ADT: 90

NH 25C

Good

Over: EASTMAN BROOK

2.25 MI. FROM JCT. NH 10, Grafton, NH

Built 1965 Load: 38.1 t ADT: 679

MAIN STREET

Good

Over: LAMPREY RIVER

0.4 Mi Fr.NH Rte.27&107, Rockingham, NH

Built 1999 Load: 38.1 t ADT: 3,248

TEBBETTS ROAD

Good

Over: NH 16 SP TPK

1.7 MI FROM DOVER TL, Strafford, NH

Built 1957 Load: 38.1 t ADT: 4,556

MILL ROAD

Good

Over: BEARCAMP RIVER

0.08 MI. RTE.25, Carroll, NH

Built 1930 Load: 38.1 t ADT: 20

NH137

Good

Over: NUBANUSIT BROOK

1.24 MI. NW DUBLIN TL, Cheshire, NH

Built 1970 Load: 38.2 t ADT: 1,751

NH 49

Good

Over: HIGH BROOK

2.4 MI. NE THORNTON TL, Grafton, NH

Built 1967 Load: 38.2 t ADT: 2,043

NH126

Good

Over: SUNCOOK RIVER

3.5 MI FROM STRAFFORD TL, Belknap, NH

Built 1929 Load: 38.3 t ADT: 3,634

GARLAND ROAD

Good

Over: NH 28

1.0 MI FROM PITTSFIELD TL, Belknap, NH

Built 1969 Load: 38.4 t ADT: 192

NH 16 NH 25

Good

Over: RELIEF BEARCAMP RIVER

2.3 MI S TAMWORTH T/L, Carroll, NH

Built 2021 Load: 38.4 t ADT: 11,527

NH 28

Good

Over: COFFIN BROOK

3.0 MI N OF BARNSTEAD TL, Belknap, NH

Built 1930 Load: 38.6 t ADT: 7,376

OLDE FARMS ROAD

Good

Over: SKINNER BROOK

0.06MI. RTE 10, Sullivan, NH

Built 2015 Load: 38.6 t ADT: 90

NH101 EB

Good

Over: MAIN STREET

4.2MI E OF CANDIA TL, Rockingham, NH

Built 1982 Load: 38.6 t ADT: 20,902

WHITTIER ROAD

Good

Over: STONY BROOK

5.7 MI E TAMWORTH TL, Carroll, NH

Built 2016 Load: 38.6 t ADT: 441

Showing 1,401-1,450 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.