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

COUNTY ROAD

Good

Over: I-89 SB

2.2 MI FROM SUTTON TL, Merrimack, NH

Built 1967 Load: 28.1 t ADT: 90

NH140

Good

Over: TIOGA RIVER

0.1 MI W BELMONT TL, Merrimack, NH

Built 1968 Load: 28.1 t ADT: 9,060

NH113A

Good

Over: WONALANCET RIVER

1.6 MI FROM SANDWICH TL, Carroll, NH

Built 1966 Load: 28.1 t ADT: 251

VILLAGE ROAD

Good

Over: CASCADE BROOK

0.43MI NH11, Merrimack, NH

Built 1935 Load: 28.1 t ADT: 323

NH 43

Good

Over: LAMPREY RIVER

0.1 MI FROM JCT RTE 107, Rockingham, NH

Built 1938 Load: 28.4 t ADT: 4,915

I-89 NH 10 NB

Good

Over: US 4

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

Built 1966 Load: 28.6 t ADT: 15,942

I-89 NH 10 SB

Good

Over: US 4

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

Built 1966 Load: 28.6 t ADT: 21,507

NH112 KANCAMAGUS

Good

Over: LEDGE BROOK

4.0 MI E. LINCOLN T.L., Grafton, NH

Built 1953 Load: 28.6 t ADT: 5,273

RIVER ROAD

Good

Over: I-93

0.01 S HOOK-MANCH TL, Hillsborough, NH

Built 1975 Load: 28.6 t ADT: 4,044

NH 4A

Good

Over: KIMPTON BROOK

1.9 MI FROM ANDOVER TL, Merrimack, NH

Built 1955 Load: 28.6 t ADT: 534

BEAR NOTCH ROAD

Good

Over: DOUGLAS BROOK

2.4 MI N. JCT 112, Carroll, NH

Built 1964 Load: 28.8 t ADT: 975

NH108

Good

Over: POWWOW RIVER

0.1 MI FROM JCT RTE 107A, Rockingham, NH

Built 1926 Load: 28.8 t ADT: 2,096

NH111A

Good

Over: BEAVER BROOK

.43 MI N PELHAM VILLAGE, Hillsborough, NH

Built 1966 Load: 28.8 t ADT: 6,239

NH 16 SP TPK

Good

Over: BRANCH RIVER

0.8 MI S. OF WAKEFIELD TL, Strafford, NH

Built 1981 Load: 28.9 t ADT: 14,303

US202

Good

Over: RICKERS BROOK

0.6 MI JCT RTE 16, Strafford, NH

Built 1939 Load: 28.9 t ADT: 7,782

GERRISH ROAD

Good

Over: NH 16 SP TPK

0.1 MI FROM JCT. 16, Strafford, NH

Built 1956 Load: 29.0 t ADT: 321

NH 25

Good

Over: OUTLET LOON POND

1.5 MI E NH-ME STATE LINE, Carroll, NH

Built 1941 Load: 29.0 t ADT: 3,402

ARCH STREET

Good

Over: BLACK BROOK

2.3 MI NE FROM JCT NH 9, Cheshire, NH

Built 1992 Load: 29.0 t ADT: 2,913

I-89 NH 10 NB

Good

Over: RIVERSIDE DR MASCOMA RIV

2.0 MIFROM ENFIELD T.L., Grafton, NH

Built 1966 Load: 29.0 t ADT: 15,942

I-89 NB

Good

Over: STONEY BROOK ROAD

0.1 MI FROM SUNAPEE TL, Sullivan, NH

Built 1968 Load: 29.0 t ADT: 9,340

I-89 SB

Good

Over: STONEY BROOK ROAD

AT SUNAPEE TL, Sullivan, NH

Built 1968 Load: 29.0 t ADT: 9,549

NO DATA ENTERED

Good

Over: EASTSIDE TRIB 1

NO DATA ENTERED, Grafton, NH

Built 2015 Load: 29.2 t ADT: 10

I-89 SB

Good

Over: MASCOMA R RIVERSIDE DR

2.0MI FROM ENFIELD T.L., Grafton, NH

Built 1966 Load: 29.4 t ADT: 16,350

US 4 NH 16 SP TPK

Good

Over: NB RAMP

N SP TPK I-95 INTERCHANGE, Rockingham, NH

Built 1971 Load: 29.4 t ADT: 12,592

NH113

Good

Over: BEARCAMP RIVER

JCT NH113/OLD NH 25, Carroll, NH

Built 2018 Load: 29.4 t ADT: 2,230

I-95 SB CONNECTOR

Good

Over: I-95 NB RAMP

SP TPK I-95 INTERCHANGE, Rockingham, NH

Built 1972 Load: 29.6 t ADT: 5,150

NH 32

Good

Over: MARTIN BROOK

1.61 MI S SWANZEY TL, Cheshire, NH

Built 1970 Load: 29.6 t ADT: 1,617

I-93 NB

Good

Over: NH132

3.0 MI FROM MEREDITH TL, Belknap, NH

Built 1963 Load: 29.7 t ADT: 10,714

PAYNE ROAD

Good

Over: RECREATION TRAIL(RR BED)

0.1 MI JCT US 4, Grafton, NH

Built 1946 Load: 29.8 t ADT: 182

LANGFORD ROAD

Good

Over: LAMPREY RIVER

0.2 MI SW JCT 101, Rockingham, NH

Built 1964 Load: 29.8 t ADT: 1,227

I-93 SB

Good

Over: MAD RIVER

4.2 MI PLYMOUTH TL, Grafton, NH

Built 1968 Load: 29.9 t ADT: 9,903

I-93 NB

Good

Over: MAD RIVER

4.4 MI PLYMOUTH TL, Grafton, NH

Built 1968 Load: 29.9 t ADT: 9,864

THRASHER ROAD

Good

Over: BLOW-ME-DOWN BROOK

0.2 MI FROM PLAINFIELD T, Sullivan, NH

Built 1996 Load: 29.9 t ADT: 90

NH153

Good

Over: STONY BROOK

0.2 MI S MADISON TL, Carroll, NH

Built 1929 Load: 29.9 t ADT: 2,701

US 2

Good

Over: RECREATIONAL TRAIL

1.4 MI RANDOLPH TL, Coos, NH

Built 1960 Load: 29.9 t ADT: 5,144

COOLIDGE WOODS RD

Good

Over: PRESCOTT BROOK

0.13 MI FR BLAKE HILL RD, Belknap, NH

Built 1920 Load: 29.9 t ADT: 90

DEPOT ROAD

Good

Over: NH101

.5 MI E CANDIA RAYMOND TL, Rockingham, NH

Built 1981 Load: 30.0 t ADT: 3,062

NH175

Good

Over: PEMIGEWASSET RIVER

0.5 MI EAST JCT US 3, Grafton, NH

Built 1976 Load: 30.0 t ADT: 672

N DORCHESTER ROAD

Good

Over: ROCKY BROOK

1.8 MI WENTWORTH TL, Grafton, NH

Built 1975 Load: 30.2 t ADT: 44

I-93 SB

Good

Over: E BR PEMIGEWASSET RIVER

0.5 MI LINCOLN TL, Grafton, NH

Built 1972 Load: 30.2 t ADT: 7,177

NH101 EB

Good

Over: HOOKSETT ROAD

1.7 MI MANCHESTER TL, Rockingham, NH

Built 1972 Load: 30.4 t ADT: 27,657

NH101 WB

Good

Over: HOOKSETT ROAD

1.7 MI MANCHESTER TL, Rockingham, NH

Built 1972 Load: 30.4 t ADT: 25,607

NH155

Good

Over: BELLAMY RIVER

.2MI FROM DOVER TL, Strafford, NH

Built 1982 Load: 30.4 t ADT: 12,126

NH 16 SP TPK

Good

Over: LYMAN BROOK

1.8 MI N OF ROCHESTER TL, Strafford, NH

Built 1980 Load: 30.5 t ADT: 16,271

NH101

Good

Over: NH122

1.3 MI MILFORD TL, Hillsborough, NH

Built 1969 Load: 30.6 t ADT: 11,617

RUDDSBORO ROAD

Good

Over: MINK BROOK

3.8 MI FR LEBANON TL, Grafton, NH

Built 2004 Load: 30.6 t ADT: 90

NORTH RIVER ROAD

Good

Over: PURGATORY BROOK

.64 MI LYNDEBORO TL., Hillsborough, NH

Built 1978 Load: 30.6 t ADT: 2,641

MILL POND ROAD

Good

Over: COLLEGE BROOK

.2 MI WEST NH108 JCT, Strafford, NH

Built 1998 Load: 30.7 t ADT: 1,649

NH101

Good

Over: NH 13

1 MI S MILFORD VILLAGE, Hillsborough, NH

Built 1976 Load: 30.7 t ADT: 23,734

I-95 SB

Good

Over: NB RAMP

SP TPK I-95 INTERCHANGE, Rockingham, NH

Built 1972 Load: 30.7 t ADT: 29,977

Showing 1,151-1,200 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.