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

ELM STREET

Good

Over: WINNIPESAUKEE RIVER

NORTHFIELD TL., Belknap, NH

Built 1977 Load: 30.7 t ADT: 9,224

COUNTY ROAD

Good

Over: MELVIN RIVER

0.5 MI FROM NH RTE 109, Carroll, NH

Built 1936 Load: 30.7 t ADT: 97

NH101

Good

Over: MERRIMACK ROAD

0.7 MI MILFORD TL, Hillsborough, NH

Built 1969 Load: 30.8 t ADT: 14,854

I-93 SB

Good

Over: NH 49

0.7 MI THORNTON TL, Grafton, NH

Built 1968 Load: 30.8 t ADT: 7,500

I-89 NH 10 NB

Good

Over: NHRR(ABD)

2.1MI. FROM ENFIELD T.L., Grafton, NH

Built 1966 Load: 30.8 t ADT: 15,942

I-89 SB

Good

Over: COLUMBUS AVENUE

2.9 MI SUTTON T.L, Merrimack, NH

Built 1967 Load: 30.8 t ADT: 9,665

I-89 SB

Good

Over: GEORGES MILLS ROAD

0.5MI FROM NEW LONDON TL, Sullivan, NH

Built 1968 Load: 30.8 t ADT: 9,263

PATTERSON ROAD

Good

Over: KIMPTON BROOK

100 YDS N RT 4A, Merrimack, NH

Built 1994 Load: 30.8 t ADT: 90

I-93 NB

Good

Over: NH112 NHRR

0.29 MI LINCOLN TL, Grafton, NH

Built 1972 Load: 30.8 t ADT: 7,054

US302

Good

Over: AMMONOOSUC RIVER

2.7 MI E. INT. US 3, Coos, NH

Built 1974 Load: 31.0 t ADT: 4,613

I-393 US 4 US202W

Good

Over: PORTSMOUTH STREET

0.7 MI E EASTSIDE DRIVE, Merrimack, NH

Built 1978 Load: 31.0 t ADT: 16,485

I-393 US 4 US202E

Good

Over: PORTSMOUTH STREET

0.7 MI E EASTSIDE DRIVE, Merrimack, NH

Built 1978 Load: 31.0 t ADT: 15,866

MASCOMA STREET

Good

Over: I-89 NH 10

5.5 MI ENFIELD TL, Grafton, NH

Built 1966 Load: 31.0 t ADT: 1,155

I-93 NB

Good

Over: NH132

1.7MI S TILTON TL, Merrimack, NH

Built 1959 Load: 31.0 t ADT: 15,272

SCOBY ROAD

Good

Over: HAUNTED LAKE OUTLET

0.7 MI SOUTH JCT NH 136, Hillsborough, NH

Built 2015 Load: 31.2 t ADT: 90

NH 4

Good

Over: SALMON FALLS RIVER

AT MAINE STATE LINE, Strafford, NH

Built 1970 Load: 31.2 t ADT: 10,271

I-93 NB

Good

Over: MIRROR LAKE ROAD

0.24 MI THORNTON TL, Grafton, NH

Built 1970 Load: 31.2 t ADT: 6,997

COBB FARM ROAD

Good

Over: RAZOR BROOK

1.9 MI FR HARTS LOCATION, Carroll, NH

Built 1935 Load: 31.4 t ADT: 315

US302

Good

Over: SACO RIVER

5.3 MI FROM CARROLL TL, Carroll, NH

Built 1976 Load: 31.4 t ADT: 2,100

NH 16 SP TPK

Good

Over: MCKEAGHNEY ROAD

0.9 MI N OF ROCHESTER TL, Strafford, NH

Built 1978 Load: 31.4 t ADT: 16,271

I-93 NB

Good

Over: NH104 NH132

1.1 MI MEREDITH TL, Belknap, NH

Built 1963 Load: 31.4 t ADT: 14,051

NH101

Good

Over: SOUHEGAN RIVER

0.04 MI MILFORD TL, Hillsborough, NH

Built 1971 Load: 31.5 t ADT: 14,854

NH106

Good

Over: SOUCOOK RIVER

CANTERBURY-LOUDON TL, Merrimack, NH

Built 1952 Load: 31.5 t ADT: 8,087

DEPOT STREET

Good

Over: SUNCOOK RIVER

0.06 MI FR EPSOM TL, Merrimack, NH

Built 1981 Load: 31.5 t ADT: 443

LYMAN ROAD

Good

Over: MILL BROOK

.59 MI N.W. JCT. 302, Grafton, NH

Built 1974 Load: 31.5 t ADT: 825

I-95

Good

Over: MARKET STREET

1.5 MI FROM MAINE SL, Rockingham, NH

Built 1970 Load: 31.5 t ADT: 68,986

I-89 SB

Good

Over: NH114

0.6 MI FROM SPRINGFIELD T, Sullivan, NH

Built 1967 Load: 31.7 t ADT: 9,549

I-89 NB

Good

Over: NH114

0.6MI FROM SPRINGFIELD TL, Sullivan, NH

Built 1967 Load: 31.7 t ADT: 9,340

I-93 SB

Good

Over: NH132

1.7MI S OF TILTON TL, Merrimack, NH

Built 1959 Load: 31.7 t ADT: 15,211

I-89 NB

Good

Over: GEORGES MILLS ROAD

0.5 FROM NEW LONDON T.L., Sullivan, NH

Built 1967 Load: 31.7 t ADT: 9,100

NH101 RAMP A-B

Good

Over: NH101

1.9MI E OF AUBURN TL, Rockingham, NH

Built 1981 Load: 31.8 t ADT: 5,936

FARAWAY ROAD

Good

Over: JOHNS RIVER

131 FT FR SMITH FOREST R, Coos, NH

Built 1976 Load: 31.8 t ADT: 90

NH101

Good

Over: NHRR(ABD)

.1 MI. FROM JCT RT 1, Rockingham, NH

Built 1963 Load: 31.8 t ADT: 8,448

NH 9 NH 10 NH 12

Good

Over: WEST STREET

1.0 MI TO KEENE CENTER, Cheshire, NH

Built 1967 Load: 31.8 t ADT: 16,495

I-93 NB

Good

Over: CLARKS RR PEMIGEWASSET R

1.5 MI N WOODSTOCK TL, Grafton, NH

Built 1981 Load: 31.8 t ADT: 5,375

NH106

Good

Over: SOUCOOK RIVER

2.6 MI FROM CONCORD TL, Merrimack, NH

Built 1977 Load: 31.8 t ADT: 12,344

NH 16 SP TPK

Good

Over: BETTS ROAD

1.1 MI S OF MILTON TL, Strafford, NH

Built 1978 Load: 31.8 t ADT: 16,271

I-93 SB

Good

Over: HALE ROAD

4.5MI TILTON T.L., Belknap, NH

Built 1963 Load: 31.8 t ADT: 14,007

I-93 NB

Good

Over: HALE ROAD

4.5 MI FROM TILTON TL, Belknap, NH

Built 1963 Load: 31.8 t ADT: 14,051

I-93 SB

Good

Over: MIRROR LAKE ROAD

0.24 MI THORNTON TL, Grafton, NH

Built 1970 Load: 31.8 t ADT: 7,156

I-93 SB

Good

Over: CLARKS RR PEMIGEWASSET R

1.56 MI N WOODSTOCK TL, Grafton, NH

Built 1973 Load: 32.0 t ADT: 5,700

I-93 SB

Good

Over: WELLINGTON ROAD

0.2 MI E JCT RTE 28, Hillsborough, NH

Built 1976 Load: 32.0 t ADT: 41,481

NH 16 SP TPK

Good

Over: SILVER STREET

3.5 MI N OF ROCHESTER TL, Strafford, NH

Built 1980 Load: 32.0 t ADT: 14,303

NORTH ROAD

Good

Over: OTTER BROOK

2.9 MI NW JEFFERSON TL, Coos, NH

Built 1958 Load: 32.2 t ADT: 1,214

I-93 SB

Good

Over: CONNECTICUT RIVER

VERMONT STATE LINE, Grafton, NH

Built 1981 Load: 32.2 t ADT: 3,262

NH106

Good

Over: SOUCOOK RIVER

1.3 MI FROM CONCORD TL, Merrimack, NH

Built 1977 Load: 32.2 t ADT: 15,134

CANAAN STREET

Good

Over: MASCOMA RIVER

0.3 MI. SE JCT. RTE. 50, Grafton, NH

Built 1936 Load: 32.3 t ADT: 691

I-93 SB

Good

Over: NH127

2.2MI FROM TILTON T.L., Belknap, NH

Built 1962 Load: 32.3 t ADT: 14,007

I-93 NB

Good

Over: NH127

2.2MI FROM TILTON-SANBORN, Belknap, NH

Built 1962 Load: 32.3 t ADT: 14,857

MAIN STREET

Good

Over: MERRIMACK RIVER CSX RD

0.7 MI N JCT US 3, Merrimack, NH

Built 1976 Load: 32.4 t ADT: 18,306

Showing 1,201-1,250 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.