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

NICHOLS HILL ROAD

Fair

Over: POND BROOK

0.09MI NH25A, Grafton, NH

Built 1940 Load: 20.9 t ADT: 90

WEST STREET

Fair

Over: ASHUELOT RIVER

0.6 MI FROM KEENE CENTER, Cheshire, NH

Built 1952 Load: 21.0 t ADT: 15,233

DWYER ROAD

Fair

Over: POND OUTLET

0.3 MI FR US RTE 302, Grafton, NH

Built 1930 Load: 21.0 t ADT: 90

BEAN MOUNTAIN ROAD

Fair

Over: LOVELL RIVER

0.01 MI W PINE HILL ROAD, Carroll, NH

Built 1999 Load: 21.0 t ADT: 90

MILL ROAD

Fair

Over: GRIDLEY RIVER

0.5 MI FROM JAFFREY TL, Hillsborough, NH

Built 1927 Load: 21.0 t ADT: 94

WADLEIGH HILL ROAD

Fair

Over: LANE RIVER

0.96 MI SOUTH N. SUTTON, Merrimack, NH

Built 1985 Load: 21.0 t ADT: 90

NEAL MINE ROAD

Fair

Over: LITTLE SUGAR RIVER

80 FT FROM STAGE ROAD 72, Sullivan, NH

Built 2011 Load: 21.0 t ADT: 90

FDR 352

Fair

Over: BOWEN BROOK

MAP 28, Grafton, NH

Built 1984 Load: 21.1 t ADT: 50

FDR 123

Fair

Over: OLIVERIAN BROOK

MAP 27, Grafton, NH

Built 1965 Load: 21.1 t ADT: 50

FDR 86

Fair

Over: N.BR. SAWYER RIVER

MAP 31, Carroll, NH

Built 1976 Load: 21.1 t ADT: 50

PARADE HILL ROAD

Fair

Over: SUNCOOK RIVER

0.1 MI S RTE 28, Belknap, NH

Built 1948 Load: 21.2 t ADT: 368

NH 27

Fair

Over: LAMPREY RIVER

.65 MI. SE RAYMOND TL, Rockingham, NH

Built 1935 Load: 21.4 t ADT: 4,848

US202

Fair

Over: CONTOOCOOK RIVER

2.0 MI FROM PETERBORO TL, Cheshire, NH

Built 1937 Load: 21.4 t ADT: 7,296

NH 77

Fair

Over: MID BR PISCATAQUOG RIVER

0.2 MI S OF WEARE TL, Hillsborough, NH

Built 1949 Load: 21.4 t ADT: 2,726

QUINTTOWN ROAD

Fair

Over: JACOBS BROOK

.45 MI. SO. MOUSLEY BR RD, Grafton, NH

Built 2007 Load: 21.4 t ADT: 90

FDR 233

Fair

Over: WILDCAT BROOK

MAP 23, Carroll, NH

Built 1977 Load: 21.4 t ADT: 50

NH130

Fair

Over: VILLAGE BROOK

.5 MI JCT RT 13, Hillsborough, NH

Built 1935 Load: 21.6 t ADT: 4,313

OLD STATE ROAD

Fair

Over: JABES MEADOW BROOK

0.3 MI S JCT NH 12A, Sullivan, NH

Built 1993 Load: 21.6 t ADT: 480

NH120

Fair

Over: GREAT BROOK

2.3 MI FROM PLAINFIELD TL, Grafton, NH

Built 1935 Load: 21.6 t ADT: 2,619

NH 10

Fair

Over: GILES BROOK

0.4 MI FROM GOSHEN TL, Sullivan, NH

Built 1934 Load: 21.8 t ADT: 1,715

NH 11

Fair

Over: PLEASANT STREAM

.3 MI FROM WILMOT T.L., Merrimack, NH

Built 1959 Load: 21.9 t ADT: 5,015

WATER STREET

Fair

Over: MINNEWAWA BROOK

.09 MI. N. JCT. NH 101, Cheshire, NH

Built 1930 Load: 21.9 t ADT: 546

WILTON ROAD

Fair

Over: SOUHEGAN RIVER

200 W OF ELM ST (NH101), Hillsborough, NH

Built 1917 Load: 21.9 t ADT: 6,615

NH 18

Fair

Over: GALE RIVER

1.6 MI FROM SUGAR HILL TL, Grafton, NH

Built 1930 Load: 22.0 t ADT: 690

US202 NH124

Fair

Over: CONTOOCOOK RIVER

3.0 MI PETERBORO TL, Cheshire, NH

Built 1938 Load: 22.1 t ADT: 11,890

RIVER ROAD

Fair

Over: BROOK

.72 MI. SW JCT. 10 AND 25, Grafton, NH

Built 1951 Load: 22.2 t ADT: 1,084

CREAMERY ROAD

Fair

Over: JACOBS BROOK

0.4 MI FR ARCHERTOWN RD, Grafton, NH

Built 1950 Load: 22.4 t ADT: 90

RIVER ROAD

Fair

Over: PERRY STREAM

0.5 MI FROM US RTE 3, Coos, NH

Built 1984 Load: 22.5 t ADT: 90

NH 9 NH 31

Fair

Over: NORTH BRANCH RIVER

4.5 MI FROM STODDARD TL, Hillsborough, NH

Built 1951 Load: 22.7 t ADT: 6,761

EASTERN CORNER RD

Fair

Over: BEEBE RIVER

2.2MI FR NH ROUTE 175, Grafton, NH

Built 1920 Load: 22.7 t ADT: 90

FEE TPK NB

Fair

Over: PENNICHUCK BROOK

NASHUA-MERRIMACK TL, Hillsborough, NH

Built 1954 Load: 22.7 t ADT: 47,314

GRANT ROAD

Fair

Over: PISCASSIC RIVER

.61 MI. SW JCT. 152, Rockingham, NH

Built 1947 Load: 22.7 t ADT: 2,332

FDR 11

Fair

Over: MILL BROOK

MAP 01, Coos, NH

Built 1983 Load: 22.7 t ADT: 50

RED WATER BROOK RD

Fair

Over: RED WATER BROOK

0.9MI NH11, Sullivan, NH

Built 1925 Load: 22.9 t ADT: 311

NH 10

Fair

Over: STOCKER BROOK

1.6 MI. FROM CROYDON TL, Sullivan, NH

Built 1936 Load: 22.9 t ADT: 6,794

NH 25

Fair

Over: NORTH BRANCH RIVER

1.0 MI FROM BENTON TL, Grafton, NH

Built 1928 Load: 22.9 t ADT: 1,051

NH 16B

Fair

Over: GREAT BROOK

1.7 MI JCT 16-A, Carroll, NH

Built 1937 Load: 22.9 t ADT: 459

MOUNTAIN ROAD

Fair

Over: ANDREW BROOK

1.25 MI. RTE. 103, Merrimack, NH

Built 1936 Load: 22.9 t ADT: 235

WELTON FALLS ROAD

Fair

Over: FOWLER RIVER

0.8 MI FR RED SCHOOL RD, Grafton, NH

Built 1965 Load: 23.0 t ADT: 90

LEBRUN ROAD

Fair

Over: S BRANCH BAKER RIVER

1.1 MI NH 118, Grafton, NH

Built 1930 Load: 23.0 t ADT: 90

OLD HILLSBORO ROAD

Fair

Over: US202 NH 9

1.71 M. HILLSBORO TL, Merrimack, NH

Built 1974 Load: 23.0 t ADT: 90

NH 25 NH118

Fair

Over: BAKER RIVER

3.6 MI FROM RUMNEY TL, Grafton, NH

Built 1937 Load: 23.0 t ADT: 3,351

FDR 39

Fair

Over: LANGDON BROOK

MAP 24, Carroll, NH

Built 1970 Load: 23.0 t ADT: 50

JEFFERS HILL ROAD

Fair

Over: OLIVERIAN BROOK

0.12 MI FR NH RTE 25, Grafton, NH

Built 1978 Load: 23.1 t ADT: 90

NH 10

Fair

Over: ASHUELOT RIVER

4.0 MI NORTH OF KEENE TL, Cheshire, NH

Built 1949 Load: 23.2 t ADT: 2,420

NH 10

Fair

Over: OLIVERIAN BROOK

1.0 MI EAST VERMONT SL, Grafton, NH

Built 1937 Load: 23.2 t ADT: 2,288

EAST SURRY ROAD

Fair

Over: ASHUELOT RIVER

TOWN RD 0.33MI KEENE TL, Cheshire, NH

Built 1940 Load: 23.2 t ADT: 817

BARNET ROAD

Fair

Over: CONNECTICUT RIVER

VERMONT STATE LINE, Grafton, NH

Built 1937 Load: 23.3 t ADT: 973

FDR 20

Fair

Over: GARDINER BROOK

MAP 33, Carroll, NH

Built 1981 Load: 23.3 t ADT: 50

BICKFORD HILL ROAD

Fair

Over: HAM BRANCH

0.07MI. RTE 116, Grafton, NH

Built 1973 Load: 23.5 t ADT: 90

Showing 201-250 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.