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

NH115A

Good

Over: CHERRY MILL BROOK

3.1 MI CARROLL TL, Coos, NH

Built 1950 Load: 33.7 t ADT: 514

NH 49

Good

Over: DRAKES BROOK

4.5 MI. E. OF THORNTON TL, Grafton, NH

Built 1967 Load: 33.7 t ADT: 2,043

PATTEN HILL ROAD

Good

Over: NH101

1.7 MI FROM RAYMOND TL, Rockingham, NH

Built 1981 Load: 33.8 t ADT: 536

NH123

Good

Over: TOWN LINE BROOK

.05 MI. NW SHARON TL, Hillsborough, NH

Built 1939 Load: 33.8 t ADT: 1,775

HILLTOP ROAD

Good

Over: I-93

0.24MI. FROM RD. #14, Grafton, NH

Built 1985 Load: 33.9 t ADT: 349

DEERFIELD ROAD

Good

Over: BACK CREEK

2.3 MI. W.OF NH156, Rockingham, NH

Built 2010 Load: 33.9 t ADT: 1,214

ALDRICH ROAD

Good

Over: MILL BROOK

0.02MI NH12, Cheshire, NH

Built 1996 Load: 33.9 t ADT: 90

US 4 NH 10

Good

Over: MASCOMA RIVER CSX

4.3 MI LEBANON T.L., Grafton, NH

Built 1945 Load: 34.0 t ADT: 13,417

NH 11B

Good

Over: GUNSTOCK RIVER

0.2 MI E NH RTE 11, Belknap, NH

Built 1970 Load: 34.1 t ADT: 7,598

BAILEY ROAD

Good

Over: BOG BROOK

1.5 MI FROM BRISTOL TL, Grafton, NH

Built 1989 Load: 34.3 t ADT: 510

INDUSTRIAL PARK RD

Good

Over: AMMONOOSUC RIVER

0.1 MI FROM US302, Grafton, NH

Built 1995 Load: 34.3 t ADT: 2,201

JEFFERSON NOTCH RD

Good

Over: S BRANCH BAKER RIVER

1.0 MI S JEFFERSON TL, Coos, NH

Built 1939 Load: 34.3 t ADT: 90

FRONT STREET

Good

Over: BLACK BROOK

2.2MI S HOOKSETT TL, Hillsborough, NH

Built 1974 Load: 34.3 t ADT: 9,085

BASKET STREET

Good

Over: BEARCAMP RIVER

0.05 MI FR SANDWICH NOTCH, Carroll, NH

Built 2020 Load: 34.3 t ADT: 90

WEST FARM ROAD

Good

Over: I-93

1.7 MI SUGARHILL TL, Grafton, NH

Built 1959 Load: 34.5 t ADT: 166

I-93 SB

Good

Over: FORDWAY EXTENSION

0.8 MI S. LONDONDERRY T L, Rockingham, NH

Built 1962 Load: 34.5 t ADT: 40,312

I-93 SB

Good

Over: NH 3A

1.0 MI N MANCHESTER CL, Merrimack, NH

Built 1976 Load: 34.5 t ADT: 28,486

CHURCH STREET

Good

Over: WINNIPESAUKEE RIVER

1.4 MI FROM BELMONT TL, Belknap, NH

Built 1981 Load: 34.5 t ADT: 5,413

TUFTONBORO ROAD

Good

Over: BEECH RIVER

3.3 MI FR TUFTONBORO TL, Carroll, NH

Built 1928 Load: 34.5 t ADT: 897

SMITH BRIDGE ROAD

Good

Over: BAKER RIVER

.31 MI N JCT NH 3-A, Grafton, NH

Built 2001 Load: 34.5 t ADT: 2,090

BEAR NOTCH ROAD

Good

Over: DOUGLAS BROOK

.53 MI N. JCT 112, Carroll, NH

Built 1964 Load: 34.7 t ADT: 975

I-93 NB

Good

Over: FORDWAY EXTENSION

0.8 MI SO. LONDONDERRY TL, Rockingham, NH

Built 1962 Load: 34.7 t ADT: 40,201

I-93 NB

Good

Over: NH141

4.2 MI SUGARHILL TL, Grafton, NH

Built 1972 Load: 34.7 t ADT: 2,401

I-93 SB

Good

Over: US 3

1.74 MI N WOODSTOCK TL, Grafton, NH

Built 1973 Load: 34.7 t ADT: 5,700

NH101A

Good

Over: FEE TPK

0.01 MI CYPRESS LANE, Hillsborough, NH

Built 1999 Load: 34.7 t ADT: 20,047

US302 NH 16

Good

Over: EAST BRANCH SACO RIVER

1.7 MI CONWAY TL, Carroll, NH

Built 1961 Load: 34.8 t ADT: 11,844

I-293 FEE TPK

Good

Over: I-293 NB ON RAMP

.6 MI BEDFORD TL, Hillsborough, NH

Built 2016 Load: 34.8 t ADT: 62,482

I-93 NB

Good

Over: NH135

1.4MI VT LINE, Grafton, NH

Built 1982 Load: 34.9 t ADT: 3,307

I-93 SB

Good

Over: NH135

1.4MI. VT LINE, Grafton, NH

Built 1982 Load: 34.9 t ADT: 3,262

MAIN STREET

Good

Over: MASCOMA LAKE

.13 MI. FROM JCT RTE 4-A, Grafton, NH

Built 2012 Load: 35.1 t ADT: 1,331

NH 32

Good

Over: MARTIN BROOK

2.38MI N RICHMOND TL, Cheshire, NH

Built 1929 Load: 35.3 t ADT: 2,912

SHINDAGEN ROAD

Good

Over: BROOK

.05 MI FROM VILLAGE ROAD, Merrimack, NH

Built 1940 Load: 35.3 t ADT: 143

I-93 SB

Good

Over: BLAIR ROAD

2.1 MI FROM PLYMOUTH TL, Grafton, NH

Built 1967 Load: 35.4 t ADT: 10,181

NH 10

Good

Over: CLARK BROOK

4.6 MI N. PIERMONT T.L., Grafton, NH

Built 1940 Load: 35.4 t ADT: 3,661

I-93 NB

Good

Over: NH 18

6.7 MI FROM VT SL, Grafton, NH

Built 1986 Load: 35.4 t ADT: 3,652

I-93 SB

Good

Over: NH 18

6.6 MI FROM VT SL, Grafton, NH

Built 1986 Load: 35.4 t ADT: 3,868

CONNORS MILL ROAD

Good

Over: SCHOODAC BROOK

0.9 MI FROM WEBSTER TL, Merrimack, NH

Built 2009 Load: 35.4 t ADT: 90

US302 NH 10

Good

Over: AMMONOOSUC RIVER

2.9 MI FROM CARROLL TL, Grafton, NH

Built 1983 Load: 35.5 t ADT: 3,217

NH 9 NH 10

Good

Over: NH 12

NORTH JCT OF NH 9 10 &12, Cheshire, NH

Built 1978 Load: 35.6 t ADT: 8,128

NH 26

Good

Over: WEST BRANCH CLEAR STREAM

0.6 MI FROM DIXVILLE TL, Coos, NH

Built 1953 Load: 35.6 t ADT: 971

TEAGUE DRIVE

Good

Over: SPICKET RIVER

100 SOUTH PARKER CIR., Rockingham, NH

Built 2014 Load: 35.6 t ADT: 446

NH132

Good

Over: I-93

0.5MI FROM CANTERBURY T.L, Merrimack, NH

Built 1959 Load: 35.7 t ADT: 1,036

NORTHWOOD ROAD

Good

Over: BUZZELS RUN BROOK

TOWN RD 1.1MI NORWD TL, Strafford, NH

Built 2010 Load: 35.7 t ADT: 652

NH 25 NH118

Good

Over: BAKER RIVER

5.8 MI FROM BENTON TL, Grafton, NH

Built 1962 Load: 35.7 t ADT: 3,654

WASHBURN ROAD

Good

Over: PATTEN BROOK

2.3 MI FROM BRISTOL TL, Grafton, NH

Built 1952 Load: 35.9 t ADT: 702

I-93 SB

Good

Over: BOG BROOK

1.1 MI FROM PLYMOUTH T.L., Grafton, NH

Built 1968 Load: 35.9 t ADT: 10,181

US 302

Good

Over: BEMIS BROOK

5.8 MI CARROLL TL, Carroll, NH

Built 1950 Load: 35.9 t ADT: 2,100

NH128

Good

Over: BEAVER BROOK

WINDHAM TL, Hillsborough, NH

Built 1935 Load: 35.9 t ADT: 4,716

US 3 NH 25

Good

Over: OWL BROOK

0.8 MI ASHLAND-HOLDERNESS, Grafton, NH

Built 1958 Load: 36.1 t ADT: 6,267

SANDOWN ROAD

Good

Over: EXETER RIVER

.1 MI EAST SANDOWN TL, Rockingham, NH

Built 2010 Load: 36.1 t ADT: 187

Showing 1,351-1,400 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.