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 EB NH101 EB

Fair

Over: NH 28A

1.0 MI E JCT RT 28, Hillsborough, NH

Built 1961 Load: 48.5 t ADT: 43,507

ALVAH WILSON ROAD

Fair

Over: GUNSTOCK RIVER

0.29 MI FR NH RTE 11A, Belknap, NH

Built 1973 Load: 48.6 t ADT: 480

I-93 FEE TPK

Fair

Over: CROSS ROAD

2.2 MI NO. MANCHESTER TL, Merrimack, NH

Built 1956 Load: 48.8 t ADT: 80,184

NH110

Fair

Over: NORTH BRANCH BROOK

0.8 MI FROM DUMMER TL, Coos, NH

Built 1954 Load: 48.8 t ADT: 1,676

SECOND STREET

Fair

Over: PISCATAQUOG (NORTH BR)

0.2 MI N QUEEN CITY BRDGE, Hillsborough, NH

Built 1915 Load: 49.0 t ADT: 6,373

NH 25 NH118

Fair

Over: BAKER RIVER

AT WENTWORTH TOWNLINE, Grafton, NH

Built 2006 Load: 49.0 t ADT: 2,099

I-293 WB NH101 WB

Fair

Over: NH 28A

1 MI E JCT RTE 28, Hillsborough, NH

Built 1961 Load: 49.1 t ADT: 45,051

CIRC HWY EB

Fair

Over: DANIEL WEBSTER HWY

.3 MI EAST FEE TPK, Hillsborough, NH

Built 1993 Load: 49.2 t ADT: 17,702

I-93 SB

Fair

Over: COTTAGE STREET

0.4 MI BETHLEHEM TL, Grafton, NH

Built 1959 Load: 49.9 t ADT: 5,432

I-93 NB

Fair

Over: COTTAGE STREET

0.4 MI BETHLEHEM TL, Grafton, NH

Built 1959 Load: 49.9 t ADT: 4,854

WINTER STREET

Fair

Over: ROARING BROOK

0.3 MI E NH RTE 110, Coos, NH

Built 1956 Load: 50.0 t ADT: 579

I-93 SB

Fair

Over: I-93 NB RAMPS

0.4 MI FROM HOLDERNESS TL, Grafton, NH

Built 1964 Load: 50.0 t ADT: 11,400

I-93 NB

Fair

Over: I-93 NB RAMPS

0.4 MI FR HOLDERNESS TL, Grafton, NH

Built 1964 Load: 50.0 t ADT: 11,292

I-93 FEE TPK

Fair

Over: ROBINSON ROAD

2.6 MI JCT RT 89, Merrimack, NH

Built 1957 Load: 50.2 t ADT: 75,591

NH 16 SP TPK

Fair

Over: NEW BELLAMY LANE

0.6 MI FROM JCT. RT. 16, Strafford, NH

Built 1955 Load: 50.2 t ADT: 41,164

WASHINGTON STREET

Fair

Over: CANAL INLET

0.6 MI FR US 3, Merrimack, NH

Built 1975 Load: 50.4 t ADT: 2,781

US 3

Fair

Over: MERRIMACK RIVER

0.1 MI EAST JCT I-93, Merrimack, NH

Built 1998 Load: 50.8 t ADT: 26,107

I-93 FEE TPK NB

Fair

Over: HALL STREET

.5 MI FROM JCT 3-A, Merrimack, NH

Built 1958 Load: 50.8 t ADT: 36,716

OLD TROY ROAD

Fair

Over: BROOK

2.25MI. MARLBORO TL, Cheshire, NH

Built 1940 Load: 50.8 t ADT: 90

GROUT HILL ROAD

Fair

Over: COLD RIVER

202 FT FROM JCT NH123A, Sullivan, NH

Built 1930 Load: 51.0 t ADT: 90

MILL ROAD

Fair

Over: EXETER RIVER

.10 MI FROM RT 111-A, Rockingham, NH

Built 1967 Load: 51.1 t ADT: 442

I-93 FEE TPK SB

Fair

Over: HALL STREET

.5 MI FROM JCT 3-A, Merrimack, NH

Built 1958 Load: 51.1 t ADT: 36,812

RAMP E(CAMP ST)

Fair

Over: CSX

0.3 MI W JCT US 3, Hillsborough, NH

Built 1970 Load: 51.1 t ADT: 6,427

GREENFIELD PARKWAY

Fair

Over: RIDDLE BROOK

.1 WEST OF LIBERTY HILL R, Hillsborough, NH

Built 2000 Load: 51.2 t ADT: 538

MINE ROAD

Fair

Over: POUCHAUG BROOK

0.18MI MASS. SL, Cheshire, NH

Built 1994 Load: 51.4 t ADT: 322

FAIRGROUNDS ROAD

Fair

Over: WEST BRANCH BROOK

1.9 MI FROM NEWBURY TL, Merrimack, NH

Built 2001 Load: 51.7 t ADT: 394

NH135

Fair

Over: AMMONOOSUC RIVER

Bath and Haverhill TL, Grafton, NH

Built 1998 Load: 51.8 t ADT: 1,526

NH 16

Fair

Over: BRANCH RIVER

3.5MI FROM MILTON T.L., Carroll, NH

Built 1959 Load: 51.8 t ADT: 9,869

NH 10

Fair

Over: ASHUELOT RIVER

3.2 MI NORTH OF KEENE TL, Cheshire, NH

Built 1935 Load: 51.9 t ADT: 3,259

COLLINS STREET

Fair

Over: SQUAM RIVER

0.4 MI FR NH RTE 132, Grafton, NH

Built 1983 Load: 52.3 t ADT: 459

US302

Fair

Over: CRAWFORD BROOK

2.4Mi E Harts Locat.T/L, Coos, NH

Built 1965 Load: 52.4 t ADT: 3,804

US 4 WB(HOIT RD)

Fair

Over: I-93 US 4 WB

.6 MI EAST CANTERBURY TL, Merrimack, NH

Built 1958 Load: 52.6 t ADT: 7,347

LADIEU ROAD

Fair

Over: BLOODS BROOK

55 FT FR HOUSER LN, Sullivan, NH

Built 1920 Load: 52.7 t ADT: 90

NH 12

Fair

Over: TARBELL BROOK

0.5 MI FROM MASS SL, Cheshire, NH

Built 1958 Load: 53.3 t ADT: 4,685

I-89 NB

Fair

Over: STEVENS BROOK ROAD

0.2MI WARNER T.L., Merrimack, NH

Built 1967 Load: 53.3 t ADT: 9,150

PROSPECT STREET

Fair

Over: AMMONOOSUC RIVER

6.6 MI FROM LITTLETON TL, Grafton, NH

Built 1928 Load: 53.4 t ADT: 175

CILLEYVILLE ROAD

Fair

Over: BLACKWATER RIVER

0.6 MI NH 11, Merrimack, NH

Built 1934 Load: 53.5 t ADT: 255

NH 12 NH103

Fair

Over: RED WATER BROOK

2.3 MI FROM VT. SL, Sullivan, NH

Built 1997 Load: 53.5 t ADT: 9,498

NH101 WB

Fair

Over: FEE TPK

.3 MI JCT RT 3, Hillsborough, NH

Built 1993 Load: 53.7 t ADT: 34,846

NH 27

Fair

Over: BEAN BROOK

1.4MI JCT RT 27, Rockingham, NH

Built 1937 Load: 53.7 t ADT: 3,419

NH130 BROAD STREET

Fair

Over: US 3 FEE TPK

.2 MI FROM COLISEUM AVE, Hillsborough, NH

Built 1999 Load: 53.9 t ADT: 26,304

I-93 SB

Fair

Over: COAL HILL RD GALE RIVER

1.9 MI SUGARHILL TL, Grafton, NH

Built 1959 Load: 54.2 t ADT: 2,599

I-89 SB

Fair

Over: US202 NH 9 WB

1.9 MI E. JCT RT 127, Merrimack, NH

Built 1959 Load: 54.4 t ADT: 11,944

NH120

Fair

Over: GREAT BROOK

1.0 MI FROM PLAINFIELD TL, Grafton, NH

Built 1930 Load: 54.5 t ADT: 2,614

NH113

Fair

Over: CHOCORUA RIVER

5.1 MI NE JCT 25 & 113, Carroll, NH

Built 1925 Load: 54.5 t ADT: 2,127

DURAND ROAD

Fair

Over: CARLTON BROOK

0.2 MI FROM US RTE2, Coos, NH

Built 2010 Load: 54.7 t ADT: 256

NO DATA ENTERED

Fair

Over: JACKMAN BROOK

MAP 36, Grafton, NH

Built 1993 Load: 54.8 t ADT: 99

SCHOOL STREET

Fair

Over: NHRR

0.1 MI FROM US 3, Belknap, NH

Built 1924 Load: 54.9 t ADT: 1,377

TROY ROAD

Fair

Over: SHAKER BROOK

1.3 MI. FROM TROY TL, Cheshire, NH

Built 1939 Load: 55.1 t ADT: 479

NH 10

Fair

Over: JACOBS BROOK

3.4 MI FROM LYME TL, Grafton, NH

Built 1938 Load: 55.2 t ADT: 1,348

Showing 901-950 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.