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-89 SB

Fair

Over: KING HILL ROAD

.3 MI FROM SUTTON TL, Merrimack, NH

Built 1967 Load: 41.8 t ADT: 9,249

I-89 NB

Fair

Over: KING HILL ROAD

0.3 MI FROM SUTTON TL, Merrimack, NH

Built 1967 Load: 41.8 t ADT: 9,260

I-93 NB

Fair

Over: SKOOKUMCHUCK BROOK

4 MI N. LINCOLN T.L., Grafton, NH

Built 1987 Load: 42.1 t ADT: 5,052

NH112

Fair

Over: HANCOCK BROOK

4.0 MI E OF LIVERMORE TL, Grafton, NH

Built 1938 Load: 42.1 t ADT: 3,061

NH 3A BROWN AVE

Fair

Over: COHAS BROOK

1.2 MI S OF JCT I-193, Hillsborough, NH

Built 1986 Load: 42.1 t ADT: 16,175

US 4

Fair

Over: NHRR(ABD)

0.075 MI W.OF RTE. 11, Merrimack, NH

Built 1959 Load: 42.3 t ADT: 2,163

MOO CORNERS RD

Fair

Over: OWL BROOK

200 OFF OWL BK RD, Grafton, NH

Built 1930 Load: 42.3 t ADT: 90

I-393 US 4 US202

Fair

Over: MERRIMACK RIVER

0.6 MI EAST OF JCT I-93, Merrimack, NH

Built 1978 Load: 42.3 t ADT: 39,922

NH 13

Fair

Over: TURKEY RIVER

2.75MI E BOW TL, Merrimack, NH

Built 1960 Load: 42.3 t ADT: 9,884

NH112 KANCAMAGUS

Fair

Over: E BR PEMIGEWASSET RIVER

3.8 MI EAST OF JCT 3A, Grafton, NH

Built 1938 Load: 42.3 t ADT: 3,061

LEBANON STREET

Fair

Over: SALMON FALLS RIVER

NH.-ME. SL, Strafford, NH

Built 1920 Load: 42.3 t ADT: 684

NH113

Fair

Over: SWIFT RIVER

1.2 MI NE JCT NH 25, Carroll, NH

Built 1987 Load: 42.3 t ADT: 2,216

JAMESTOWN ROAD

Fair

Over: WINNIPESAUKEE RIVER

AT BELMONT TOWN LINE, Belknap, NH

Built 1982 Load: 42.3 t ADT: 3,362

J CONNOR ROAD

Fair

Over: PISCATAQUOG RIVER

0.18 MI FROM NH RTE 114, Hillsborough, NH

Built 2003 Load: 42.4 t ADT: 90

NH 16TRK 12TH ST

Fair

Over: ANDROSCOGGIN RIVER

12TH ST BERLIN, Coos, NH

Built 1975 Load: 42.5 t ADT: 3,317

JEFFERSON NOTCH RD

Fair

Over: S BRANCH ISRAEL RIVER

1.3 MI S JEFFERSON TL, Coos, NH

Built 1939 Load: 42.5 t ADT: 90

PINNACLE HILL ROAD

Fair

Over: I-93

1.1 MI MEREDITH TL, Belknap, NH

Built 1963 Load: 42.5 t ADT: 142

BODWELL ROAD

Fair

Over: COHAS BROOK

0.1 MI E FROM I-93 NB, Hillsborough, NH

Built 1962 Load: 42.6 t ADT: 3,415

MAIN STREET

Fair

Over: SUGAR RIVER

115 FT FROM GARNETT ST, Sullivan, NH

Built 1920 Load: 42.6 t ADT: 2,144

US 3 FEE TPK NB

Fair

Over: NASHUA RIVER

0.3 MI FROM NH 130, Hillsborough, NH

Built 1955 Load: 42.8 t ADT: 71,603

FDR 12

Fair

Over: BLUE BROOK

MAP 14, Coos, NH

Built 1947 Load: 42.8 t ADT: 50

GOLDMINE ROAD

Fair

Over: STANLEY BROOK

TOWN RD., Cheshire, NH

Built 1985 Load: 42.9 t ADT: 370

JEWETT ROAD

Fair

Over: I-89

1.8 MI E JCT 202, Merrimack, NH

Built 1959 Load: 42.9 t ADT: 1,677

I-93 FEE TPK

Fair

Over: NH 9 LOUDON ROAD

1.6 MI N JCT RTE 3, Merrimack, NH

Built 1966 Load: 43.1 t ADT: 53,224

NH 16TRK UNITY ST

Fair

Over: ANDROSCOGGIN RIVER

120FT FROM RTE 16, Coos, NH

Built 1982 Load: 43.3 t ADT: 3,983

NH 12A

Fair

Over: BLOOD BROOK

.4 MI. FROM PLAINFIELD TL, Grafton, NH

Built 1954 Load: 43.3 t ADT: 3,516

I-89 NB

Fair

Over: PLAZA CONNECTOR ROAD

0.4 MI EAST OF VT/NH LINE, Grafton, NH

Built 2012 Load: 43.3 t ADT: 28,128

BRIDGE STREET WB

Fair

Over: I-293 NH 3A CSX MERR R

0.4 MI FROM ELM ST INV#8, Hillsborough, NH

Built 1990 Load: 43.3 t ADT: 4,290

BRIDGE STREET EB

Fair

Over: I-293 NH 3A CSX MERR R

0.4 MI FROM ELM ST INV#8, Hillsborough, NH

Built 1988 Load: 43.3 t ADT: 4,290

NH 9

Fair

Over: OLD NH 9 GRANITE LK OUT

1.1 MI E SULLIVAN TL, Cheshire, NH

Built 1994 Load: 43.3 t ADT: 6,028

I-93 SB

Fair

Over: OWL STREET

0.7 MI THORNTON TL, Grafton, NH

Built 1968 Load: 43.5 t ADT: 7,500

NH 16 SP TPK

Fair

Over: LONG HILL ROAD

1.5 MI. ROCHESTER TL., Strafford, NH

Built 1956 Load: 43.5 t ADT: 29,795

I-93 PARKWAY

Fair

Over: TRAM ACCESS ROAD

2.2 MI. N. LINCOLN T.L., Grafton, NH

Built 1986 Load: 43.5 t ADT: 11,427

CHAPEL ROAD

Fair

Over: LOVELL RIVER

0.5 MI FR OSSIPEE RD, Carroll, NH

Built 1940 Load: 43.5 t ADT: 90

I-93 PARKWAY NB

Fair

Over: TRAIL PEMIGEWASSET RIVER

5.0 MI NO WOODSTOCK TL, Grafton, NH

Built 1985 Load: 43.6 t ADT: 5,723

I-93 SB ON RAMP

Fair

Over: I-93

4.9 MI LINCOLN TL, Grafton, NH

Built 1959 Load: 43.7 t ADT: 2,607

TRIPOLI ROAD

Fair

Over: MAD RIVER

.29 MI. FROM JCT. RTE. 49, Grafton, NH

Built 1968 Load: 43.7 t ADT: 409

NH136

Fair

Over: OTTER BROOK

1.9 MI E GREENFIELD TL, Hillsborough, NH

Built 1968 Load: 43.8 t ADT: 2,481

BIBLE HILL ROAD

Fair

Over: US202

Bible Hill Road / US202, Hillsborough, NH

Built 2000 Load: 43.9 t ADT: 90

I-93 NB

Fair

Over: US 3

0.2 MI CAMPTON TL, Grafton, NH

Built 1968 Load: 43.9 t ADT: 7,928

I-89 NH 10

Fair

Over: BROOK ATV TRAIL

0.4MI S LEBANON T/L, Grafton, NH

Built 1959 Load: 44.0 t ADT: 24,571

NH103

Fair

Over: I-89 NB

3.6 MI N. HOPKINTON T.L., Merrimack, NH

Built 1966 Load: 44.2 t ADT: 1,345

BOSTON POST ROAD

Fair

Over: BEAVER BROOK

1.6 MI MONT VERNON TL, Hillsborough, NH

Built 1970 Load: 44.5 t ADT: 2,458

BLACKWATER ROAD

Fair

Over: CRYSTAL LAKE BROOK

0.8 MI FROM ENFIELD TL, Grafton, NH

Built 1988 Load: 44.5 t ADT: 470

JEFFERSON NOTCH RD

Fair

Over: S BRANCH ISRAEL RIVER

1.5 MI S JEFFERSON TL, Coos, NH

Built 1990 Load: 44.5 t ADT: 90

SALMON STREET WB

Fair

Over: MERRIMACK RIVER CSX RD

.3MI W JCT US 3, Hillsborough, NH

Built 1970 Load: 44.5 t ADT: 12,785

NH 28 S WILLOW ST

Fair

Over: COHAS BROOK

1.2 MI N LONDONDERRY TL, Hillsborough, NH

Built 1989 Load: 44.5 t ADT: 15,874

HILLDALE LANE

Fair

Over: S BR PISCATAQUOG RIVER

0.07 MI FR RIVER RD, Hillsborough, NH

Built 1920 Load: 44.5 t ADT: 90

TREMONT STREET

Fair

Over: CONTOOCOOK RIVER

CONCORD TL, Merrimack, NH

Built 1955 Load: 44.7 t ADT: 5,247

TOLL PLAZA ACCESS

Fair

Over: FEE TPK NB ON-RAMP

1/4 SOUTH OF PLAZA, Hillsborough, NH

Built 2010 Load: 44.9 t ADT: 50

Showing 801-850 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.