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

US 3 BUS NH107

Fair

Over: BLACK BROOK

3.75 MI N BELMONT TL, Belknap, NH

Built 1975 Load: 40.0 t ADT: 14,041

I-93 PARKWAY SB

Fair

Over: TRAIL PEMIGEWASSET RIVER

5.1 MI NO WOODSTOCK TL, Grafton, NH

Built 1986 Load: 40.0 t ADT: 5,704

NH 10

Fair

Over: SAWYER BROOK

2.2 MI. FROM CROYDON TL, Sullivan, NH

Built 1968 Load: 40.2 t ADT: 6,794

BEAN BROOK ROAD

Fair

Over: BEAN BROOK

0.27 MI. RTE.10, Grafton, NH

Built 2009 Load: 40.2 t ADT: 90

NH113

Fair

Over: CHANDLER BROOK

3.0 MI S OF MAINE SL, Carroll, NH

Built 1931 Load: 40.4 t ADT: 343

PENACOOK ROAD

Fair

Over: CONTOOCOOK RIVER

1.0 MI FR WEBSTER TL, Merrimack, NH

Built 1980 Load: 40.4 t ADT: 1,218

NH101 EB

Fair

Over: LAMPREY RIVER

.1 MI RAYMOND T.L., Rockingham, NH

Built 1963 Load: 40.5 t ADT: 22,645

NEWBURY ROAD

Fair

Over: CONNECTICUT RIVER

VERMONT STATE LINE, Grafton, NH

Built 1970 Load: 40.5 t ADT: 2,094

GARAGE WAY

Fair

Over: SALMON FALLS RIVER

NH-ME SL, Strafford, NH

Built 1950 Load: 40.5 t ADT: 2,320

I-93 SB

Fair

Over: US 3

0.2 MI CAMPTON TL, Grafton, NH

Built 1968 Load: 40.6 t ADT: 7,703

TUNNEL STREAM ROAD

Fair

Over: TUNNEL BROOK

.7 MI FR EASTON TL, Grafton, NH

Built 1928 Load: 40.8 t ADT: 57

NH 3A

Fair

Over: SMITH RIVER

HILL BRISTOL TL, Grafton, NH

Built 1940 Load: 40.8 t ADT: 2,570

NH175

Fair

Over: WINTER BROOK

6.2 MI N JCT US 3, Grafton, NH

Built 1974 Load: 40.8 t ADT: 1,912

NH 12 NH103

Fair

Over: SUGAR RIVER

3.8 MI FROM VERMONT SL, Sullivan, NH

Built 1996 Load: 40.8 t ADT: 6,023

NH 16 SP TPK NB

Fair

Over: BMRR

.4 MI. FROM JCT RT 9, Strafford, NH

Built 1957 Load: 40.8 t ADT: 22,053

EASTMAN HILL ROAD

Fair

Over: I-89 NH 10

0.2 MI LEBANON T.L., Grafton, NH

Built 1961 Load: 40.8 t ADT: 2,148

NH108 NH111 NH 27

Fair

Over: EXETER RIVER

.1 MI FROM JCT RT 101C, Rockingham, NH

Built 1934 Load: 40.8 t ADT: 16,688

NH 10

Fair

Over: GUNNISON BROOK

1.78 MI N LEMPSTER TL, Sullivan, NH

Built 1975 Load: 40.8 t ADT: 2,767

NH 10A WHEELOCK ST

Fair

Over: CONNECTICUT RIVER

0.1 MI FROM VERMONT SL, Grafton, NH

Built 1998 Load: 40.8 t ADT: 11,311

NH 3A

Fair

Over: NEEDLE SHOP BROOK

1.4 MI FROM FRANKLIN, Merrimack, NH

Built 1940 Load: 40.8 t ADT: 2,612

NH127

Fair

Over: I-89

1.9 MI N JCT US202, Merrimack, NH

Built 1994 Load: 40.8 t ADT: 3,779

JEFFERSON NOTCH RD

Fair

Over: S BRANCH ISRAEL RIVER

1.7 MI S JEFFERSON TL, Coos, NH

Built 1934 Load: 40.8 t ADT: 90

NH101 WB

Fair

Over: I-93 SB OFF RAMP

AT STEVENS POND, Hillsborough, NH

Built 1961 Load: 40.8 t ADT: 16,739

RAMP H

Fair

Over: FEE TPK

AT EXIT 2, Hillsborough, NH

Built 1993 Load: 40.8 t ADT: 8,802

NH156

Fair

Over: PAWTUCKAWAY RIVER

.5 MI. N. RAYMOND TL, Rockingham, NH

Built 1942 Load: 40.8 t ADT: 3,238

TUTTLE HILL ROAD

Fair

Over: ORANGE BROOK

0.16 MI FR ORANGE RD, Grafton, NH

Built 1995 Load: 40.8 t ADT: 118

SPRING ROAD

Fair

Over: NUBANUSIT BROOK

0.2 MI FR DUBLIN TL, Hillsborough, NH

Built 1940 Load: 40.8 t ADT: 226

ROCKNHAM MALL ENTR

Fair

Over: ROCKHAM BLVD BK PARKNLOT

ROCKINGHAM MALL, Rockingham, NH

Built 1991 Load: 40.8 t ADT: 4,527

VT105 BRIDGE ST

Fair

Over: CONNECTICUT RIVER

VERMONT STATE LINE, Coos, NH

Built 1947 Load: 40.8 t ADT: 1,113

NH 12 NH123

Fair

Over: COLD RIVER

.1MI FROM JCT RT 123, Cheshire, NH

Built 1960 Load: 40.8 t ADT: 5,983

ISAAC FRYE HIGHWAY

Fair

Over: SOUHEGAN RIVER

.14 MI SE JCT 31, Hillsborough, NH

Built 1993 Load: 40.8 t ADT: 838

NH101 WB

Fair

Over: BRIDGE STREET

1.2 MI W JCT RTE 28 BYP, Hillsborough, NH

Built 1961 Load: 40.9 t ADT: 16,739

NH101 EB

Fair

Over: BRIDGE STREET

1.2 MI W. JCT RTE 28 BYP, Hillsborough, NH

Built 1961 Load: 40.9 t ADT: 19,515

WINN HILL ROAD

Fair

Over: SUGAR RIVER

2.1 MI. CROYDON TL, Sullivan, NH

Built 1910 Load: 41.1 t ADT: 90

WEST PORTSMOUTH ST

Fair

Over: I-93 US 4

1.4 MI N. JCT 132, Merrimack, NH

Built 2000 Load: 41.2 t ADT: 4,337

NH 13 NH114

Fair

Over: PISCATAQUOG RIVER

.3 MI S JCT RT 13, Hillsborough, NH

Built 1928 Load: 41.2 t ADT: 13,265

OCEAN ROAD

Fair

Over: I-95

0.3 MI PORTSMOUTH TL, Rockingham, NH

Built 1972 Load: 41.2 t ADT: 9,300

NH109

Fair

Over: SHANNON BROOK

3.3 MI FROM TUFTONBORO TL, Carroll, NH

Built 1929 Load: 41.2 t ADT: 3,457

ELM STREET

Fair

Over: NUBANUSIT BROOK

0.04 MI FR MAIN ST, Hillsborough, NH

Built 2003 Load: 41.2 t ADT: 2,297

I-89 SB

Fair

Over: WARNER RIVER

1.0 MI HOPKINTON TL, Merrimack, NH

Built 1966 Load: 41.3 t ADT: 10,378

I-89 NB

Fair

Over: WARNER RIVER

1.0 MI HOPKINTON T.L., Merrimack, NH

Built 1966 Load: 41.3 t ADT: 10,031

BEAR NOTCH ROAD

Fair

Over: SWIFT RIVER

.35 MI NORTH JCT 112, Carroll, NH

Built 1961 Load: 41.5 t ADT: 975

US302

Fair

Over: AMMONOOSUC RIVER

4.46 MI E JCT US 3, Coos, NH

Built 1987 Load: 41.5 t ADT: 3,804

DEPOT ROAD

Fair

Over: S BR PISCATAQUOG RIVER

3.8 MI N OF VERNON TL, Hillsborough, NH

Built 1993 Load: 41.5 t ADT: 107

NH101 WB

Fair

Over: KING STREET

3.5 MI JCT RT. 28, Rockingham, NH

Built 1961 Load: 41.7 t ADT: 26,632

DODGE ROAD

Fair

Over: PETTYBORO BROOK

1.5 MI FR LISBON TL, Grafton, NH

Built 1972 Load: 41.7 t ADT: 235

GARLAND ROAD

Fair

Over: BUNNEL BROOK

0.5 MI FR MCGARY ROAD, Coos, NH

Built 1981 Load: 41.7 t ADT: 90

LINDEN STREET

Fair

Over: EXETER RIVER

1.36MI. RTE 111, Rockingham, NH

Built 1993 Load: 41.8 t ADT: 504

I-89 NH 10 NB

Fair

Over: I-89 RAMP

0.1 MI FROM ENFIELD TL, Sullivan, NH

Built 1972 Load: 41.8 t ADT: 10,644

CHAMBERLAIN ROAD

Fair

Over: CONTOOCOOK RIVER

OFF HADLEY STATION ROAD, Cheshire, NH

Built 1950 Load: 41.8 t ADT: 50

Showing 751-800 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.