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

MCINDOES STREET

Fair

Over: CONNECTICUT RIVER

VERMONT STATE LINE, Grafton, NH

Built 1930 Load: 19.0 t ADT: 435

US 3 NH 11

Fair

Over: WINNIPESAUKEE RIVER

5.2MI FROM FRANKLIN T.L., Merrimack, NH

Built 1940 Load: 19.1 t ADT: 13,926

COTTON ROAD

Fair

Over: BAKER BROOK

0.9 MI FROM SHAKER ST #8, Merrimack, NH

Built 1945 Load: 19.1 t ADT: 90

WEST BRANCH ROAD

Fair

Over: MAD RIVER

0.18 MI FROM NH RTE 49, Grafton, NH

Built 1950 Load: 19.1 t ADT: 145

NH112

Fair

Over: GORDON POND BROOK

0.3 MI WEST OF JCT RTE 3, Grafton, NH

Built 1940 Load: 19.1 t ADT: 2,740

POOR FARM ROAD

Fair

Over: S BR PISCATAQUOG RIVER

0.8MI. RTE 136, Hillsborough, NH

Built 2004 Load: 19.2 t ADT: 172

ISLAND STREET

Fair

Over: ASHUELOT RIVER

DOWNTOWN KEENE, Cheshire, NH

Built 1979 Load: 19.2 t ADT: 5,953

DANIEL WEBSTER HWY

Fair

Over: NASHUA RIVER

0.02 MI FROM PEARSON AVE, Hillsborough, NH

Built 1925 Load: 19.2 t ADT: 16,408

NH 31

Fair

Over: ASHUELOT RIVER

1.85 MI. S. GOSHEN TL, Sullivan, NH

Built 1935 Load: 19.2 t ADT: 487

ELLSWORTH HILL RD

Fair

Over: POND BROOK

0.11 MI NH25, Grafton, NH

Built 1930 Load: 19.2 t ADT: 103

MASON ROAD

Fair

Over: NISSITISSIT RIVER

.49 MI NW JCT 13, Hillsborough, NH

Built 1932 Load: 19.4 t ADT: 3,105

HADLEY ROAD

Fair

Over: CONTOOCOOK RIVER

0.9MI. TL PETERBORO, Cheshire, NH

Built 1939 Load: 19.4 t ADT: 67

LEWIS ROAD

Fair

Over: ASHUELOT RIVER

50 FT JCT NH 10, Cheshire, NH

Built 1960 Load: 19.4 t ADT: 90

NH175

Fair

Over: MAD RIVER

6.6 MI N JCT US 3, Grafton, NH

Built 1927 Load: 19.8 t ADT: 1,912

NH149

Fair

Over: CONTOOCOOK RIVER

.1 MI. FROM JCT. US 202, Hillsborough, NH

Built 1893 Load: 19.8 t ADT: 4,440

NH 77 TRUCK ROUTE

Fair

Over: PISCATAQUOG RIVER

0.02 MI S JCT NH 77, Hillsborough, NH

Built 1940 Load: 19.8 t ADT: 3,283

NH 31

Fair

Over: STONY BROOK

0.4 MI FROM JCT RTE 101, Hillsborough, NH

Built 1905 Load: 19.8 t ADT: 2,840

CROSS ROAD

Fair

Over: S BR PISCATAQUOG RIVER

TOWN RD, Hillsborough, NH

Built 1930 Load: 20.0 t ADT: 90

DELAGE FARM ROAD

Fair

Over: HAM BRANCH

0.43 MI. RTE 116, Grafton, NH

Built 2001 Load: 20.0 t ADT: 90

SURRY RD

Fair

Over: ASHUELOT RIVER

2.52 MI E SURRY TL, Cheshire, NH

Built 1863 Load: 20.0 t ADT: 1,214

LINK ROAD

Fair

Over: FERGUSON BROOK

0.3 MI FR NH RTE 123, Hillsborough, NH

Built 1995 Load: 20.0 t ADT: 105

LARCOMB ROAD

Fair

Over: ISRAEL RIVER

0.2 MI FR NH RTE 115, Coos, NH

Built 1975 Load: 20.0 t ADT: 90

CURRIER ROAD

Fair

Over: SOUCOOK RIVER

0.6 MI FR OLD NH 106, Merrimack, NH

Built 1930 Load: 20.0 t ADT: 90

US 3

Fair

Over: CONNECTICUT RIVER

17.4 MI E OF ROUTE 145, Coos, NH

Built 1961 Load: 20.0 t ADT: 217

PIERCES ISLAND RD

Fair

Over: LITTLE HARBOR

200 FT FROM MECHANIC ST, Rockingham, NH

Built 1958 Load: 20.0 t ADT: 1,243

STINSON LAKE ROAD

Fair

Over: STINSON BROOK

1.8 MI JCT 25, Grafton, NH

Built 1955 Load: 20.0 t ADT: 840

FOWLERS MILL ROAD

Fair

Over: SWIFT RIVER

0.13 MI. RTE.113A, Carroll, NH

Built 1920 Load: 20.0 t ADT: 90

SODOM ROAD

Fair

Over: MELVIN RIVER

1.5 MI. RTE. 109A, Carroll, NH

Built 1970 Load: 20.0 t ADT: 526

COLD POND ROAD

Fair

Over: LITTLE SUGAR RIVER

2.3 MI. ACWORTH TL, Sullivan, NH

Built 1930 Load: 20.0 t ADT: 339

TYLER ROAD

Fair

Over: BLACKWATER RIVER

3.0 MI N OF HOPKINTON TL, Merrimack, NH

Built 1951 Load: 20.0 t ADT: 270

ROADWAY

Fair

Over: DECEPTION BROOK

MAP 11, Coos, NH

Built 1949 Load: 20.1 t ADT: 100

FDR 22

Fair

Over: TRIB. HUBBARD BROOK

MAP 36, Grafton, NH

Built 1966 Load: 20.1 t ADT: 99

VALLEY ROAD

Fair

Over: REC TRAIL(RR BED)

0.2 MI NH 11, Merrimack, NH

Built 1930 Load: 20.2 t ADT: 90

DIAMOND POND ROAD

Fair

Over: E BRANCH MOHAWK RIVER

0.83 N JCT RT 26, Coos, NH

Built 1930 Load: 20.2 t ADT: 90

PATTERSON HILL RD

Fair

Over: CONTOOCOOK RIVER

3.6 MI FR DEERING TL, Merrimack, NH

Built 1915 Load: 20.2 t ADT: 145

NH103 NH127

Fair

Over: CONTOOCOOK RIVER

1.6 MI S WARNER TL, Merrimack, NH

Built 1935 Load: 20.2 t ADT: 6,814

FDR 92

Fair

Over: N.BR. GALE RIVER

MAP 19, Grafton, NH

Built 1971 Load: 20.4 t ADT: 50

FDR 15

Fair

Over: UPPER AMMONOOSUC

MAP 02, Coos, NH

Built 1949 Load: 20.4 t ADT: 50

FDR 38

Fair

Over: SLIPPERY BROOK

MAP 24, Carroll, NH

Built 1963 Load: 20.4 t ADT: 50

COLDBROOK ROAD

Fair

Over: MOOSE RIVER

0.4 MI FROM US RTE 2, Coos, NH

Built 1949 Load: 20.6 t ADT: 90

FDR 127

Fair

Over: WITCHER BROOK

MAP 27, Coos, NH

Built 1977 Load: 20.7 t ADT: 99

FDR 203

Fair

Over: OSCEOLA BROOK

MAP 38, Grafton, NH

Built 1976 Load: 20.7 t ADT: 50

BLAKE ROAD

Fair

Over: LAMPREY RIVER

TOWN RD, Rockingham, NH

Built 1952 Load: 20.8 t ADT: 555

MCINTYRE ROAD

Fair

Over: ARBORETUM DRIVE

TOWN RD, Rockingham, NH

Built 1972 Load: 20.8 t ADT: 1,413

US 4

Fair

Over: INDIAN RIVER

4.7 MI FROM ENFIELD TL, Grafton, NH

Built 1930 Load: 20.9 t ADT: 5,839

US 3 ELM ST

Fair

Over: CSX(ABD)

.2 MI N OF JCT RT 3A, Hillsborough, NH

Built 1915 Load: 20.9 t ADT: 13,386

FRONT STREET

Fair

Over: SALMON FALLS RIVER

ME.-NH STATE LINE, Strafford, NH

Built 1962 Load: 20.9 t ADT: 2,003

MARLBORO ROAD

Fair

Over: FARRAR POND

.59 MI. S. MARLBOROUGH TL, Cheshire, NH

Built 1933 Load: 20.9 t ADT: 479

NEW ROAD

Fair

Over: MELVIN RIVER

0.8 MI FROM NH RTE 109, Carroll, NH

Built 1940 Load: 20.9 t ADT: 240

NH118

Fair

Over: BAKER RIVER

0.9 MI FROM JCT RTE 25, Grafton, NH

Built 1947 Load: 20.9 t ADT: 1,127

Showing 151-200 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.