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 NB

Fair

Over: NH 10

4.9 MI FROM SPRINGFIELD T, Sullivan, NH

Built 1959 Load: 33.3 t ADT: 10,644

NH106 MAIN ST

Fair

Over: WINNIPESAUKEE RIVER

1.0 MI BELMONT T.L., Belknap, NH

Built 1970 Load: 33.3 t ADT: 18,428

I-93 SB

Fair

Over: NH132

2.5MI S. TILTON TL, Merrimack, NH

Built 1959 Load: 33.3 t ADT: 17,641

I-95(RAMP B-D)

Fair

Over: I-95

0.2 MI N OF HAMPTON TL, Rockingham, NH

Built 1976 Load: 33.3 t ADT: 19,199

I-95

Fair

Over: PISCATAQUA RIVER

I-95 AT MAINE STATE LINE, Rockingham, NH

Built 1971 Load: 33.4 t ADT: 73,085

TOWN HOUSE ROAD

Fair

Over: MILL BROOK

2.4 MI. FROM JCT. 12-A, Sullivan, NH

Built 1940 Load: 33.5 t ADT: 632

I-93 SB

Fair

Over: NH175A

1.0 MI ASHLAND T.L., Grafton, NH

Built 1963 Load: 33.5 t ADT: 11,400

I-93 NB

Fair

Over: NH175A

1.0 MI ASHLAND T.L., Grafton, NH

Built 1963 Load: 33.5 t ADT: 10,709

ELM AVENUE

Fair

Over: NORTH BRANCH RIVER

0.06MI NH9, Hillsborough, NH

Built 1984 Load: 33.6 t ADT: 535

I-89(RAMP F)

Fair

Over: TURKEY RIVER

BOW INTERCHANGE, Merrimack, NH

Built 1959 Load: 33.6 t ADT: 4,580

NH104

Fair

Over: BOG POND BROOK

2.4 MI SW HILL TL, Merrimack, NH

Built 1930 Load: 33.6 t ADT: 3,469

US202 NH 9

Fair

Over: ELM BROOK

2.4 MI E. HENNIKER T.L., Merrimack, NH

Built 1961 Load: 33.6 t ADT: 16,732

NORTHSIDE ROAD

Fair

Over: NASH STREAM

1.3 MI. NORTHUMBERLAND TL, Coos, NH

Built 1977 Load: 33.6 t ADT: 342

MILL STREET

Fair

Over: MILL TAIL RACE

.25 MI JCT NH 12, Cheshire, NH

Built 1936 Load: 33.6 t ADT: 90

I-95 RAMP

Fair

Over: NH101

AT I-95 INTERCHANGE, Rockingham, NH

Built 1976 Load: 33.7 t ADT: 20,496

NH 10

Fair

Over: EASTMAN BROOK

1.4 MI FROM ORFORD T.L., Grafton, NH

Built 1952 Load: 33.7 t ADT: 1,223

BROOK ROAD

Fair

Over: BROCK BROOK

0.3 MI FR SHIN VALLEY RD, Grafton, NH

Built 1930 Load: 33.8 t ADT: 90

WEST SHORE ROAD

Fair

Over: FOWLER RIVER

0.7 MI FROM ALEXANDRIA TL, Grafton, NH

Built 1931 Load: 33.8 t ADT: 1,710

WEST SHORE ROAD

Fair

Over: NEWFOUND RIVER

2.7 MI FROM DANBURY TL, Grafton, NH

Built 1944 Load: 33.8 t ADT: 3,898

FDR 15

Fair

Over: W.BR.AMMONOOSUC RIVER

MAP 02, Coos, NH

Built 2005 Load: 34.0 t ADT: 99

OLD NH 11

Fair

Over: MERRYMEETING RIVER

0.2 MI SE ALTON TL, Strafford, NH

Built 1926 Load: 34.1 t ADT: 785

WESTGATE ROAD

Fair

Over: BLOW-ME-DOWN BROOK

0.5 MI. RTE.12A, Sullivan, NH

Built 1981 Load: 34.1 t ADT: 180

NORTH RAMP

Fair

Over: I-293 FEE TPK

.5MI FROM STARK LANE, Hillsborough, NH

Built 1957 Load: 34.3 t ADT: 13,831

PRESCOTT ROAD

Fair

Over: SALMON BROOK

250FT. RTE. 127, Belknap, NH

Built 1969 Load: 34.3 t ADT: 1,268

NH118

Fair

Over: BLODGETT BROOK

3.3 MI FROM WOODSTOCK TL, Grafton, NH

Built 1960 Load: 34.3 t ADT: 1,127

SAUNDERS HILL ROAD

Fair

Over: BAKER RIVER

0.06 MI. W OF NH 25, Grafton, NH

Built 1928 Load: 34.3 t ADT: 21

FDR 400

Fair

Over: BEEBE RIVER

MAP 45, Carroll, NH

Built 1982 Load: 34.3 t ADT: 50

RIVER ROAD

Fair

Over: LOVEJOY BROOK

1.6 MI FROM BARTLETT TL, Carroll, NH

Built 1961 Load: 34.5 t ADT: 4,565

NH 26

Fair

Over: CLEAR STREAM

0.2 MI NW MILLSFIELD TL, Coos, NH

Built 1951 Load: 34.5 t ADT: 971

I-93 NB

Fair

Over: NH 3A

1.0 MI N MANCHESTER CL, Merrimack, NH

Built 1976 Load: 34.5 t ADT: 25,134

STREETER POND ROAD

Fair

Over: AMMONOOSUC RIVER

30 FT FROM RTE 302, Grafton, NH

Built 1980 Load: 34.5 t ADT: 789

SANDWICH NOTCH RD

Fair

Over: BEARCAMP RIVER

5.4 MI FR THORNTON TL, Carroll, NH

Built 1983 Load: 34.5 t ADT: 90

SANDWICH NOTCH RD

Fair

Over: BEARCAMP RIVER

5.1 MI FR THORNTON TL, Carroll, NH

Built 1983 Load: 34.5 t ADT: 90

CHASE ROAD

Fair

Over: POWWOW RIVER

.2 MI. SW OF NH 107-A, Rockingham, NH

Built 1967 Load: 34.5 t ADT: 688

NH 31

Fair

Over: STONY BROOK

1.5 MI FM LYNDEBOROUGH TL, Hillsborough, NH

Built 1928 Load: 34.5 t ADT: 3,806

NH101

Fair

Over: DRAKESIDE ROAD

0.6 MI FROM JCT 101C, Rockingham, NH

Built 1963 Load: 34.6 t ADT: 11,203

RAMSDELL ROAD

Fair

Over: CONTOOCOOK RIVER

.09 MI FR NH RTE 114, Merrimack, NH

Built 1937 Load: 34.6 t ADT: 523

NH 12A

Fair

Over: MASCOMA RIVER

2.7 MI. N. PLAINFIELD TL, Grafton, NH

Built 1977 Load: 34.7 t ADT: 12,592

NH127

Fair

Over: SPILLWAY CHANNEL

2.77 MI JCT US 202, Merrimack, NH

Built 1961 Load: 35.1 t ADT: 3,357

WENTWORTH ROAD

Fair

Over: GREAT BROOK

1.9 MI FR WESTMORELAND T, Cheshire, NH

Built 1950 Load: 35.1 t ADT: 319

NH 77 NH114

Fair

Over: PISCATAQUOG RIVER

1.9 MI S OF HENNIKER TL, Hillsborough, NH

Built 1939 Load: 35.1 t ADT: 7,655

EAST MILAN ROAD

Fair

Over: HORNE BROOK

0.98 MI MILAN, Coos, NH

Built 1932 Load: 35.3 t ADT: 1,101

I-95

Fair

Over: PREBLE WAY CSX

Approach to High Level Br, Rockingham, NH

Built 1971 Load: 35.3 t ADT: 73,085

PLEASANT VALLEY RD

Fair

Over: OTTER BROOK

.7 MI FR LOST NATION #51, Coos, NH

Built 1980 Load: 35.4 t ADT: 90

SLAYTON HILL ROAD

Fair

Over: MASCOMA RIVER

.09 MI FROM US RTE NO 4, Grafton, NH

Built 1972 Load: 35.4 t ADT: 1,365

I-93 SB

Fair

Over: NH 18 NH135

AT JCT NH 18 AND NH 135, Grafton, NH

Built 1983 Load: 35.4 t ADT: 3,262

NORTH ROAD

Fair

Over: LEADMINE BROOK

1.1 MI N JCT US 2, Coos, NH

Built 1960 Load: 35.5 t ADT: 90

US 3 NH 11 NH132

Fair

Over: GULF BROOK

3.3 MI NE FRANKLIN TL, Belknap, NH

Built 1936 Load: 35.5 t ADT: 22,764

NH101

Fair

Over: US 1 SB

2.3 MI. FROM JCT. RT 95, Rockingham, NH

Built 1963 Load: 35.6 t ADT: 8,448

NH104

Fair

Over: PEMIGEWASSET RIVER

NEW HAMPTON TL, Grafton, NH

Built 1987 Load: 35.7 t ADT: 9,160

Showing 651-700 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.