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

NH 97

Fair

Over: SPICKET RIVER

.5MI W MASS SL, Rockingham, NH

Built 1958 Load: 44.9 t ADT: 15,781

JEFFERSON NOTCH RD

Fair

Over: S BRANCH ISRAEL RIVER

1.1 M S JEFFERSON TL, Coos, NH

Built 1939 Load: 45.3 t ADT: 90

GUILDHALL ROAD

Fair

Over: CONNECTICUT RIVER

VERMONT STATE LINE, Coos, NH

Built 1984 Load: 45.3 t ADT: 807

I-89 SB

Fair

Over: STEVENS BROOK ROAD

0.2MI WARNER T.L., Merrimack, NH

Built 1967 Load: 45.3 t ADT: 9,144

I-93 FEE TPK NB

Fair

Over: CSX

.2MINJCT RT3-A, Merrimack, NH

Built 1957 Load: 45.4 t ADT: 41,887

I-93 PARKWAY

Fair

Over: BIKE PATH LAFAYETTE BK

3.3 MI N. LINCOLN TL, Grafton, NH

Built 1987 Load: 45.4 t ADT: 10,069

NH 63

Fair

Over: ASHUELOT RIVER

0.1 MI FROM JCT 119 & 63, Cheshire, NH

Built 1940 Load: 45.4 t ADT: 1,908

US 3 FEE TPK NB

Fair

Over: CANAL SERVICE ROAD

0.5 MI FROM NH 130, Hillsborough, NH

Built 1955 Load: 45.4 t ADT: 57,702

NH 33

Fair

Over: I-95

3.0MI S OF MAINE S/L, Rockingham, NH

Built 1971 Load: 45.4 t ADT: 20,029

I-93 SB RAMPS

Fair

Over: I-93 NB

.2 MI S OF JCT NH 38, Rockingham, NH

Built 2008 Load: 45.4 t ADT: 18,539

COTTON ROAD

Fair

Over: LAMPREY RIVER

0.05 MI. RTE 107, Rockingham, NH

Built 1986 Load: 45.5 t ADT: 745

US 4

Fair

Over: NH155A

.5 MI. FROM LEE T.L., Strafford, NH

Built 1968 Load: 45.5 t ADT: 13,086

BLACK HALL ROAD

Fair

Over: LITTLE SUNCOOK RIVER

.09 MI SW JCT US4, Merrimack, NH

Built 1924 Load: 45.5 t ADT: 2,085

EAST DUNSTABLE RD

Fair

Over: FEE TPK RAMP 4CD

0.01 MI FROM SALMON BK, Hillsborough, NH

Built 1996 Load: 45.5 t ADT: 27,787

US 4

Fair

Over: HUPPE BROOK

0.08 MI. FROM ENFIELD TL, Grafton, NH

Built 1945 Load: 45.7 t ADT: 10,800

PARKER ROAD

Fair

Over: S BR PISCATAQUOG RIVER

177 FT FR RIVER ROAD, Hillsborough, NH

Built 1937 Load: 45.7 t ADT: 1,174

SOUTH RIVER ROAD

Fair

Over: GREAT BROOK

1.4 MI FR WESTMORELAND T, Cheshire, NH

Built 1950 Load: 45.7 t ADT: 119

MAIN STREET

Fair

Over: CSX PEDESTRIAN

1.6 MI SE LEE T.L., Strafford, NH

Built 1936 Load: 45.9 t ADT: 7,598

I-89 SB

Fair

Over: STICKNEY HILL ROAD

1.7 MI NW JCT RT 13, Merrimack, NH

Built 1959 Load: 46.2 t ADT: 19,523

I-89 NB

Fair

Over: STICKNEY HILL ROAD

1.7 MI NW JCT RTE 13, Merrimack, NH

Built 1959 Load: 46.2 t ADT: 19,086

NH123

Fair

Over: BAILEY BROOK

0.4 MI SE NELSON TL, Cheshire, NH

Built 1939 Load: 46.2 t ADT: 1,331

NO DATA ENTERED

Fair

Over: AMMONOOSUC RIVER

MAP 10, Grafton, NH

Built 2006 Load: 46.3 t ADT: 100

I-89 SB

Fair

Over: CONTOOCOOK RIVER

1.2 MI N.W. JCT RT 127, Merrimack, NH

Built 1959 Load: 46.5 t ADT: 11,347

CIRC HWY WB

Fair

Over: DANIEL WEBSTER HWY

.3 MI EAST FEE TPK, Hillsborough, NH

Built 1993 Load: 46.5 t ADT: 21,128

NH286

Fair

Over: BLACKWATER RIVER

.1 MI JCT RT 1-A, Rockingham, NH

Built 1991 Load: 46.5 t ADT: 13,388

QUAKER WHITEFACE R

Fair

Over: WHITEFACE RIVER

0.45 MI. RTE. 113A, Carroll, NH

Built 1953 Load: 46.7 t ADT: 90

BORDEAU ROAD

Fair

Over: STRATFORD BOG BROOK

3.1 MI. US3, Coos, NH

Built 1970 Load: 46.7 t ADT: 90

NH101 WB

Fair

Over: I-293(RAMP D)

.2 MI JCT RT 3, Hillsborough, NH

Built 1959 Load: 46.9 t ADT: 24,425

NH 16

Fair

Over: CLAY BROOK

0.7 MI NE MARTINS LOC., Coos, NH

Built 1932 Load: 46.9 t ADT: 5,025

US 3 CD ROAD

Fair

Over: SPIT BROOK ROAD

0.5 MI NORTH MASS SL, Hillsborough, NH

Built 1993 Load: 47.0 t ADT: 4,801

NH 11 NH103

Fair

Over: SUGAR RIVER PED TRAIL

2.2 MI FROM CLAREMONT TL, Sullivan, NH

Built 1998 Load: 47.0 t ADT: 9,812

NH 12

Fair

Over: MILL BROOK

3.5 MI TO WALPOLE TL, Cheshire, NH

Built 1928 Load: 47.0 t ADT: 6,382

US302 NH 18 NH116

Fair

Over: I-93

2.1 MI SUGARHILL TL, Grafton, NH

Built 1959 Load: 47.2 t ADT: 3,037

US 1

Fair

Over: TAYLOR RIVER

0.1 MI HAMPTON FALLS TL, Rockingham, NH

Built 1965 Load: 47.2 t ADT: 20,578

ROBINSON ROAD

Fair

Over: MOOSE BROOK

3.2 MI FROM GREENFIELD T, Hillsborough, NH

Built 1990 Load: 47.2 t ADT: 21

I-89 SB

Fair

Over: BOG ROAD

1.4 MI FROMSUTTON TL, Merrimack, NH

Built 1967 Load: 47.4 t ADT: 9,665

MARLOW ROAD

Fair

Over: ASHUELOT RIVER

TOWN RD 0.54 MI MARLOW TL, Sullivan, NH

Built 1920 Load: 47.4 t ADT: 64

US302

Fair

Over: ELLIS RIVER

0.20mi west of jct. NH16, Carroll, NH

Built 1998 Load: 47.7 t ADT: 6,003

US 4

Fair

Over: INDIAN RIVER

5.7 MI FROM ENFIELD TL, Grafton, NH

Built 1942 Load: 47.7 t ADT: 2,550

NH 43 NH107

Fair

Over: LAMPREY RIVER

0.1 MI FROM JCT RTE 107A, Rockingham, NH

Built 1989 Load: 47.7 t ADT: 7,000

BOYS CAMP ROAD

Fair

Over: BICKNELL BROOK

.9 MI FR NH RTE 4A, Grafton, NH

Built 1947 Load: 47.7 t ADT: 90

NH 25

Fair

Over: HALLS BROOK

200 FT FROM NH RTE 25, Grafton, NH

Built 1964 Load: 47.7 t ADT: 4,731

US 3

Fair

Over: AMMONOOSUC RIVER

1.9 MI BETHLEHEM TL, Coos, NH

Built 1972 Load: 48.0 t ADT: 5,127

I-89 SB

Fair

Over: PINE STREET

3.2 MI E. OF WARNER T.L., Merrimack, NH

Built 1959 Load: 48.0 t ADT: 11,347

NH 12

Fair

Over: MAPLE AVENUE

2.5 MI SURRY TL, Cheshire, NH

Built 1966 Load: 48.1 t ADT: 10,707

CONNECTOR ROAD

Fair

Over: PEMIGEWASSET RIVER

.04 MI S.E. JCT US 3, Grafton, NH

Built 1937 Load: 48.1 t ADT: 3,252

US 4

Fair

Over: RIVER ROAD BMRR(ABD)

0.4MI FROM CONCORD TL, Merrimack, NH

Built 1958 Load: 48.4 t ADT: 14,848

NH111

Fair

Over: US 3 FEE TPK

0.02 MI FROM NH111-A, Hillsborough, NH

Built 1998 Load: 48.4 t ADT: 38,879

VALLEY ROAD

Fair

Over: SNOWS BROOK

5.2 MI E THORNTONTTL TL, Grafton, NH

Built 1985 Load: 48.4 t ADT: 576

I-95

Fair

Over: ACCESS ROAD

.3 MI FROM JCT RT 101, Rockingham, NH

Built 1950 Load: 48.5 t ADT: 84,486

Showing 851-900 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.