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

BREAKFAST HILL RD

Fair

Over: I-95

1.1 MI NORTH HAMPTON TL, Rockingham, NH

Built 1972 Load: 24.7 t ADT: 3,003

US 3 NH 25

Fair

Over: BAKER RIVER

4.3 MI FM BRIDGEWATER TL, Grafton, NH

Built 1930 Load: 24.7 t ADT: 4,270

US 3

Fair

Over: CONE BROOK

3.7 MI NE STRATFORD TL, Coos, NH

Built 1952 Load: 24.9 t ADT: 3,178

BASE STATION ROAD

Fair

Over: BLACK BROOK

2.98 MI NE JCT RTE US 302, Coos, NH

Built 1934 Load: 24.9 t ADT: 1,775

LAKE SHORE DRIVE

Fair

Over: SUCKER BROOK

.37 MI. N. OF JCT. NH 11, Merrimack, NH

Built 1942 Load: 24.9 t ADT: 363

POVERTY LANE

Fair

Over: I-89

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

Built 1966 Load: 24.9 t ADT: 984

NH110

Fair

Over: MILL BROOK

3.8 MI NORTHUMBERLAND TL, Coos, NH

Built 1963 Load: 24.9 t ADT: 1,923

FDE 92

Fair

Over: S.BR.GALE RIVER

MAP 19, Grafton, NH

Built 1972 Load: 24.9 t ADT: 50

NO DATA ENTERED

Fair

Over: CLAYBANK BROOK

NO DATA ENTERED, Carroll, NH

Built 1974 Load: 24.9 t ADT: 99

NH120

Fair

Over: BLOW-ME-DOWN BROOK

0.8 MI FROM PLAINFIELD TL, Sullivan, NH

Built 1933 Load: 25.1 t ADT: 2,172

NH104

Fair

Over: SMITH RIVER

1.0 MI FROM HILL TL, Merrimack, NH

Built 1940 Load: 25.1 t ADT: 3,469

CRAIG ROAD

Fair

Over: STANLEY BROOK

0.5 MI. RTE 137, Cheshire, NH

Built 1935 Load: 25.1 t ADT: 232

NH 63

Fair

Over: KILBURN BROOK

4.4 MI S CHESTERFIELD TL, Cheshire, NH

Built 1936 Load: 25.1 t ADT: 1,619

GREAT BROOK ROAD

Fair

Over: GREAT BROOK

380 FT FR NH RTE 120, Grafton, NH

Built 1936 Load: 25.1 t ADT: 105

NH 31

Fair

Over: BLOOD BROOK

0.2 MI FROM JCT RTE 101, Hillsborough, NH

Built 1937 Load: 25.1 t ADT: 4,322

NH112 LOST RIV RD

Fair

Over: CLAY BROOK

3.5 MI FROM LANDAFF TL, Grafton, NH

Built 1932 Load: 25.2 t ADT: 1,652

GRANDVIEW ROAD

Fair

Over: I-93 FEE TPK

0.4 MI JCT I-89, Merrimack, NH

Built 1978 Load: 25.3 t ADT: 1,116

BUTTER HILL ROAD

Fair

Over: MCDONOUGH BROOK

0.4 MI FR NH RTE 113, Carroll, NH

Built 1955 Load: 25.3 t ADT: 90

NUTTING ROAD

Fair

Over: CONTOOCOOK RIVER

215 FT FR NH RTE 137, Cheshire, NH

Built 1905 Load: 25.3 t ADT: 90

BESSIE PIERCE ROAD

Fair

Over: PARTRIDGE BROOK

1.48MI NH 63, Cheshire, NH

Built 1936 Load: 25.3 t ADT: 10

NO DATA ENTERED

Fair

Over: INDIGO SALE

NO DATA ENTERED, Grafton, NH

Built 2015 Load: 25.3 t ADT: 99

NH111A

Fair

Over: LITTLE RIVER

1.75 MI. TO BRENTWOOD TL, Rockingham, NH

Built 1934 Load: 25.4 t ADT: 2,463

NH108

Fair

Over: EXETER RIVER

0.3 MI FROM KENSINGTON TL, Rockingham, NH

Built 1935 Load: 25.4 t ADT: 5,591

OLD COUNTY RD S

Fair

Over: BRENNAN BROOK

TOWN RD, Hillsborough, NH

Built 1930 Load: 25.4 t ADT: 27

EAST MADISON ROAD

Fair

Over: FORREST BROOK

420 FT FROM NH RTE 113 ^, Carroll, NH

Built 1958 Load: 25.4 t ADT: 842

NH111A

Fair

Over: DUDLEY BROOK

.6 MI. FROM BRENTWOOD TL, Rockingham, NH

Built 1936 Load: 25.5 t ADT: 1,626

WESTPORT ROAD

Fair

Over: ASHUELOT RIVER

.68 MI NE WINCHESTER TL, Cheshire, NH

Built 1862 Load: 25.5 t ADT: 780

NO DATA ENTERED

Fair

Over: INDIGO SALE

NO DATA ENTERED, Grafton, NH

Built 2008 Load: 25.6 t ADT: 99

FDR 229

Fair

Over: MOOSILAUKE BROOK

MAP 29, Grafton, NH

Built 1979 Load: 25.6 t ADT: 50

JIM TOWN ROAD

Fair

Over: MOOSE BROOK

0.45 MI W JCT US 2, Coos, NH

Built 1975 Load: 25.7 t ADT: 604

NH 28A MAMMOTH RD

Fair

Over: COHAS BROOK

1.3 MI N LONDONDERRY TL, Hillsborough, NH

Built 1935 Load: 25.7 t ADT: 11,711

ALLDS STREET

Fair

Over: SALMON BROOK

.2 MI E OF MAIN ST, Hillsborough, NH

Built 1892 Load: 25.7 t ADT: 8,913

MARKET STREET WB

Fair

Over: TIDAL BASIN

.5 MI E JCT I-95, Rockingham, NH

Built 1971 Load: 25.7 t ADT: 8,968

DONATI DRIVE

Fair

Over: I-93

0.1 MI MANCHESTER CL, Merrimack, NH

Built 1976 Load: 25.8 t ADT: 2,108

NH107

Fair

Over: LAMPREY RIVER

.4 MI S JCT RT 101, Rockingham, NH

Built 1962 Load: 25.8 t ADT: 13,430

WADLEIGH HILL ROAD

Fair

Over: KEZAR LAKE OUTLET

0.17MI NH 114, Merrimack, NH

Built 1940 Load: 25.8 t ADT: 359

MADBURY ROAD

Fair

Over: CSX

.2 MI JCT RTE 4, Strafford, NH

Built 1980 Load: 25.9 t ADT: 4,618

SOUTH ROAD

Fair

Over: I-89

.8 MI E OF JCT US 202, Merrimack, NH

Built 1959 Load: 25.9 t ADT: 90

MOUNTAIN ROAD

Fair

Over: ASHUELOT RIVER

0.45 MI. TL WASHINGTON, Sullivan, NH

Built 1936 Load: 25.9 t ADT: 1,214

NH 33

Fair

Over: CSX

.8 MI JCT I-95, Rockingham, NH

Built 1971 Load: 25.9 t ADT: 13,782

I-93 SB ON RAMP

Fair

Over: NHRR CONSTITUTION AV.

0.1 MI WEST OF JCT I-93, Merrimack, NH

Built 1949 Load: 26.1 t ADT: 3,483

NH116

Fair

Over: HAM BRANCH

2.01 MI S FRANCONIA T.L., Grafton, NH

Built 1932 Load: 26.1 t ADT: 404

SAW MILL ROAD

Fair

Over: BEARDS BROOK

1.4 MI. RTE. 9, Hillsborough, NH

Built 1919 Load: 26.3 t ADT: 583

MESSER STREET

Fair

Over: WINNIPESAUKEE RIVER

1.0 MI. JCT 106, Belknap, NH

Built 1980 Load: 26.3 t ADT: 5,460

NH135

Fair

Over: I-93

4 MI N OF BETHLEHEM TL, Grafton, NH

Built 1981 Load: 26.3 t ADT: 4,836

CLIFFORD BROOK RD

Fair

Over: CLIFFORD BROOK

0.6 MI. JCT FISH HATCH RD, Grafton, NH

Built 1983 Load: 26.3 t ADT: 90

BROOK ROAD

Fair

Over: JACOBS BROOK

210 FT. RTE. 25A, Grafton, NH

Built 1930 Load: 26.4 t ADT: 52

NH125

Fair

Over: EXETER RIVER

.03 MI FR NH 111 A, Rockingham, NH

Built 1960 Load: 26.5 t ADT: 11,753

OLD NH 9

Fair

Over: BEARDS BROOK

0.3MI JCT 9-31-202, Hillsborough, NH

Built 1951 Load: 26.5 t ADT: 2,998

NH111

Fair

Over: NASHUA RIVER

.7 MI FROM NASHUA TL, Hillsborough, NH

Built 1950 Load: 26.5 t ADT: 12,691

Showing 301-350 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.