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

NH152

Poor

Over: NORTH RIVER

5.15MI. NW LEE TL, Rockingham, NH

Built 1925 Load: 30.2 t ADT: 3,415

NH 11

Poor

Over: MERRYMEETING RIVER

8.5 MI FROM GILFORD TL, Belknap, NH

Built 1934 Load: 30.6 t ADT: 10,193

PERCH POND ROAD

Poor

Over: RYAN BROOK

1.9 MI FR HOLDERNESS TL, Grafton, NH

Built 1940 Load: 30.7 t ADT: 90

NH 12

Poor

Over: NECRR

4.9 MI. FROM WALPOLE TL, Sullivan, NH

Built 1959 Load: 31.0 t ADT: 3,766

SALMON STREET EB

Poor

Over: MERRIMACK R CSX RD RAMP

0.3MI W OF JCT RT 3, Hillsborough, NH

Built 1970 Load: 31.4 t ADT: 12,854

NH 9(LOUDON ROAD)

Poor

Over: MERRIMACK RIVER

0.1 MI EAST JCT I-93, Merrimack, NH

Built 1966 Load: 31.7 t ADT: 23,188

NH 11

Poor

Over: SUCKER BROOK

0.4 MI FROM FRANKLIN T.L., Merrimack, NH

Built 1929 Load: 32.3 t ADT: 2,622

NH 11

Poor

Over: SUCKER BROOK

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

Built 1929 Load: 32.3 t ADT: 2,622

NH 25A

Poor

Over: BRACKETT BROOK

9.9 MI FROM VERMONT SL, Grafton, NH

Built 1929 Load: 32.3 t ADT: 805

FOWLER RIVER ROAD

Poor

Over: FOWLER RIVER

5.2MI FR TUFTONBORO TL, Grafton, NH

Built 1930 Load: 32.7 t ADT: 234

BEALS ROAD

Poor

Over: BABOOSIC BROOK

33 FT FR MERRIMACK TL, Hillsborough, NH

Built 1928 Load: 32.7 t ADT: 481

PLAINS ROAD

Poor

Over: SUGAR RIVER

0.1 MI JCT RTE 12, Sullivan, NH

Built 1974 Load: 32.7 t ADT: 1,356

NH120 PARK LOT PED

Poor

Over: NHRR(ABD)

.1 MI FROM JCT RTE 4, Grafton, NH

Built 1969 Load: 32.7 t ADT: 7,709

NH 18

Poor

Over: CONNECTICUT RIVER

NH-VT SL, Grafton, NH

Built 1934 Load: 32.7 t ADT: 1,486

HALL ROAD

Poor

Over: LITTLE COHAS BROOK

0.73 MI FR HARVEY RD, Rockingham, NH

Built 1974 Load: 32.7 t ADT: 1,920

NH 49

Poor

Over: MAD RIVER

1.9 MI SW WATERVILLE T L, Grafton, NH

Built 1979 Load: 32.7 t ADT: 2,786

US 4 MECHANIC ST

Poor

Over: MASCOMA RIVER

5.4 MI FROM HANOVER TL, Grafton, NH

Built 1977 Load: 32.8 t ADT: 12,552

DUPAW GOULD ROAD

Poor

Over: LANCY BROOK

1.4 MI FR MCINTOSH RD, Hillsborough, NH

Built 1987 Load: 33.0 t ADT: 443

US202

Poor

Over: NHRR CONSTITUTION AV.

.1 MI WEST JCT I-93, Merrimack, NH

Built 1958 Load: 33.3 t ADT: 44,531

SPRING STREET

Poor

Over: COCHECO RIVER

1.38MI RTE 11, Strafford, NH

Built 1926 Load: 33.5 t ADT: 759

I-89 SB

Poor

Over: CONNECTICUT RIVER NECRR

0.04 MI FROM VT. SL., Grafton, NH

Built 1966 Load: 33.8 t ADT: 20,851

I-89 NB

Poor

Over: CONNECTICUT RIVER NECRR

0.04 MI FROM VT SL., Grafton, NH

Built 1966 Load: 33.8 t ADT: 21,851

LAST STREET

Poor

Over: SUCKER BROOK

0.03 MI NH 11, Merrimack, NH

Built 1936 Load: 35.9 t ADT: 90

NH 11

Poor

Over: POOR FARM BROOK

1.7 MI S ALTON TL, Belknap, NH

Built 1966 Load: 37.2 t ADT: 5,454

TIRRELL HILL ROAD

Poor

Over: BLACK BROOK

1.9MI Fr Goffstwn Back RD, Hillsborough, NH

Built 1994 Load: 37.2 t ADT: 1,273

FDR 304

Poor

Over: LITTLE RIVER

MAP 10, Grafton, NH

Built 1975 Load: 37.3 t ADT: 50

RECYCLE WAY

Poor

Over: ASHUELOT RIVER

0.04MI NH119, Cheshire, NH

Built 1947 Load: 37.6 t ADT: 25

SCHOOL STREET

Poor

Over: AMMONOOSUC RIVER

214 FT FROM NH RTE 112, Grafton, NH

Built 1960 Load: 38.1 t ADT: 1,702

NH119

Poor

Over: CONNECTICUT RIVER

0.3 MI E VERMONT SL, Cheshire, NH

Built 1920 Load: 38.6 t ADT: 8,409

I-89

Poor

Over: SOUTH STREET

BOW INTERCHANGE, Merrimack, NH

Built 1959 Load: 39.0 t ADT: 46,769

SHEPARD HOME ROAD

Poor

Over: EXETER RIVER

0.8MI. NH102, Rockingham, NH

Built 1986 Load: 39.2 t ADT: 446

NH 31

Poor

Over: STONY BROOK

0.1 MI FM LYNDEBOROUGH TL, Hillsborough, NH

Built 1929 Load: 39.2 t ADT: 3,444

BABOOSIC LAKE ROAD

Poor

Over: FEE TPK

.8 MI FROM SOUHEGAN R, Hillsborough, NH

Built 1954 Load: 39.4 t ADT: 6,216

NH 12

Poor

Over: S BRANCH ASHUELOT RIVER

1.5 MI S TO TROY CENTER, Cheshire, NH

Built 1941 Load: 41.7 t ADT: 8,843

WASHBURN ROAD

Poor

Over: PATTEN BROOK

8.11 MI FROM E HILL RD, Grafton, NH

Built 1950 Load: 44.7 t ADT: 314

BROOK ROAD

Poor

Over: SALMON BROOK

0.1 MI FROM HALE RD, Belknap, NH

Built 1900 Load: 45.4 t ADT: 90

I-89 SB

Poor

Over: TURKEY POND

1.5 MI NW JCT RT 13, Merrimack, NH

Built 1959 Load: 47.4 t ADT: 19,873

I-89 NB

Poor

Over: TURKEY POND

1.5 MI NW OF JCT RT 13, Merrimack, NH

Built 1959 Load: 47.4 t ADT: 19,523

FRYE MILL ROAD

Poor

Over: BURTON POND OUTLET

1.2Mi.Fr.Issac Frye Hwy., Hillsborough, NH

Built 1920 Load: 51.8 t ADT: 35

CARLETON HILL ROAD

Poor

Over: MOHAWK RIVER

0.15 MI SE JCT NH 26, Coos, NH

Built 1935 Load: 55.1 t ADT: 425

I-293 FEE TPK

Poor

Over: STARK WAY

1.9MI S HOOKSETT T.L., Hillsborough, NH

Built 1956 Load: 57.6 t ADT: 45,069

MAPLE AVE

Poor

Over: BLACK BROOK

DOWNTOWN KEENE, Cheshire, NH

Built 1961 Load: 89.8 t ADT: 3,140

Showing 2,501-2,542 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.