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

CENTURY LANE

Good

Over: COLBY BROOK

1/10 EAST OF ALBUQUERQUE, Hillsborough, NH

Built 2000 Load: 32.7 t ADT: 481

I-93 NB

Good

Over: CONNECTICUT RIVER

@VERMONT STATE LINE, Grafton, NH

Built 1976 Load: 32.7 t ADT: 3,307

I-93 NB

Good

Over: NH 18 NH135

AT JCT NH 18 AND NH 135, Grafton, NH

Built 1983 Load: 32.7 t ADT: 4,127

MANTER MILL ROAD

Good

Over: COHAS BROOK

0.25ML JUNC. OLD DERRY RD, Rockingham, NH

Built 2000 Load: 32.7 t ADT: 481

HUNTER MILL WAY

Good

Over: COHAS BROOK

.3 M SOUTH OLD DERRY RD, Rockingham, NH

Built 2000 Load: 32.7 t ADT: 481

SOUTH ROAD

Good

Over: BEAVER BROOK

2.6 MI FR HUDSON TL, Rockingham, NH

Built 1970 Load: 32.7 t ADT: 5,166

PETTYBORO ROAD

Good

Over: PETTYBORO BROOK

0.8 MI FROM BATH TL, Grafton, NH

Built 1985 Load: 32.7 t ADT: 208

OSSIPEE LAKE ROAD

Good

Over: W BR SILVER RIVER

290 FT FR FREEDOM TL, Carroll, NH

Built 1979 Load: 32.7 t ADT: 3,298

I-293 NB OFF RAMP

Good

Over: MERRIMACK RIVER

AT GRANITE ST BRIDGE, Hillsborough, NH

Built 1983 Load: 32.7 t ADT: 9,505

COUNTY ROAD

Good

Over: SOUHEGAN RIVER

0.23MI AMHERST TL, Hillsborough, NH

Built 1987 Load: 32.7 t ADT: 3,124

APPLEBEE ROAD

Good

Over: BRANCH RIVER

370 FROM INT OF NH 125, Strafford, NH

Built 1966 Load: 32.7 t ADT: 2,640

SARGENT ROAD

Good

Over: WILLIAMS BROOK

190 FT FR ZION HILL RD, Merrimack, NH

Built 1985 Load: 32.7 t ADT: 2,389

FOREST ROAD

Good

Over: WILLIAMS BROOK

0.10 MI FR SARGENT ST, Merrimack, NH

Built 1960 Load: 32.7 t ADT: 573

WALNUT AVE

Good

Over: I-95

0.5 MI JCT NH151, Rockingham, NH

Built 1975 Load: 32.7 t ADT: 1,016

VALLEY ROAD

Good

Over: DAN HOLE RIVER

2.8 MI FR OLD NH RTE 16, Carroll, NH

Built 2007 Load: 32.7 t ADT: 421

MOULTONVILLE ROAD

Good

Over: DAN HOLE RIVER

1.54 MI N. JCT. 16, Carroll, NH

Built 1976 Load: 32.7 t ADT: 1,022

NH 16 NH 25

Good

Over: LOVELL RIVER

4.3 MI S TAMWORTH T/L, Carroll, NH

Built 2021 Load: 32.7 t ADT: 11,527

NH 16 NH 25

Good

Over: OLD NH 16 OLD NH 25

NEW NH 16 OVER OLD NH 16, Carroll, NH

Built 1970 Load: 32.7 t ADT: 11,527

BEAN ROAD

Good

Over: BLOODS BROOK

45 FT FROM NH RTE 120, Sullivan, NH

Built 1969 Load: 32.7 t ADT: 474

US 1 BYPASS

Good

Over: HODGSON BROOK

0.3 MI JCT I-95, Rockingham, NH

Built 1940 Load: 32.7 t ADT: 15,307

FAY MARTIN ROAD

Good

Over: TULLY BROOK

0.25 MI. FROM NH119, Cheshire, NH

Built 2013 Load: 32.7 t ADT: 90

SPAULDING AVE

Good

Over: CANAL

200 FT FROM 030/097, Strafford, NH

Built 2012 Load: 32.7 t ADT: 990

MAIN STREET

Good

Over: COCHECO RIVER

3.1 MI DOVER TL, Strafford, NH

Built 1986 Load: 32.7 t ADT: 8,160

NH 1A

Good

Over: PARSONS CREEK

4.0 MI FROM N HAMPTON TL, Rockingham, NH

Built 1986 Load: 32.7 t ADT: 1,894

SCHOOLHOUSE ROAD

Good

Over: RED HILL RIVER

0.6 MI FROM RED HILL RD, Carroll, NH

Built 2018 Load: 32.7 t ADT: 90

BENNETT ST LOOP

Good

Over: POND BROOK

0.04 MI FR BENNETT ST, Carroll, NH

Built 1994 Load: 32.7 t ADT: 90

BENNETT STREET

Good

Over: POND BROOK

0.9 MI FR INTERVALE RD, Carroll, NH

Built 1979 Load: 32.7 t ADT: 57

US 2

Good

Over: CLEMENT BROOK

5.1 MI FROM GORHAM TL, Coos, NH

Built 1967 Load: 32.7 t ADT: 3,495

US 2

Good

Over: CONNOR BROOK

0.2 MI FROM MAINE SL, Coos, NH

Built 1960 Load: 32.7 t ADT: 3,495

SILVER LAKE ROAD

Good

Over: HYDRO CANAL

.25 MI E OF US RTE. 3, Belknap, NH

Built 1984 Load: 32.7 t ADT: 1,681

NH 12

Good

Over: S BRANCH ASHUELOT RIVER

2.2MI TO TROY CENTER, Cheshire, NH

Built 1983 Load: 32.7 t ADT: 8,843

COUNTY ROAD

Good

Over: GREAT BROOK

5.52 MI SURRY TL, Cheshire, NH

Built 1968 Load: 32.7 t ADT: 355

MILL STREET

Good

Over: HALFMOON POND OUTLET

0.23 MI NH 31, Sullivan, NH

Built 2012 Load: 32.7 t ADT: 90

NH111

Good

Over: BEAVER BROOK

AT HUDSON TL, Rockingham, NH

Built 1961 Load: 32.7 t ADT: 13,884

NH124

Good

Over: MINNEWAWA BROOK

0.1 MI. FROM JCT. NH 101, Cheshire, NH

Built 1967 Load: 33.0 t ADT: 3,955

I-93 SB

Good

Over: BAY STREET

1.7MI S. TILTON T.L., Merrimack, NH

Built 1960 Load: 33.0 t ADT: 15,211

I-93 NB

Good

Over: BAY STREET

1.7 MI S. TILTON TL, Merrimack, NH

Built 1960 Load: 33.0 t ADT: 15,272

OLD NH 9

Good

Over: GRANITE LAKE OUTLET

200 FT. RTE.9, Cheshire, NH

Built 1932 Load: 33.1 t ADT: 180

OLD CONCORD ROAD

Good

Over: GRANITE LAKE OUTLET

0.1 MI FROM NELSON TL, Cheshire, NH

Built 1932 Load: 33.1 t ADT: 180

I-93 SB

Good

Over: I-293 FEE TPK

AT JCT WITH FEET, Merrimack, NH

Built 1977 Load: 33.3 t ADT: 20,756

LOON MOUNTAIN ROAD

Good

Over: E BR PEMIGEWASSET RIVER

315 FT FROM NH RTE 112, Grafton, NH

Built 2016 Load: 33.3 t ADT: 1,532

NO DATA ENTERED

Good

Over: EASTSIDE TRIB 4

NO DATA ENTERED, Grafton, NH

Built 2015 Load: 33.4 t ADT: 10

NH 9 NH 10

Good

Over: ASHUELOT RIVER

0.2 MI EAST OF JCT NH 12, Cheshire, NH

Built 1978 Load: 33.5 t ADT: 11,910

BANK STREET EXT.

Good

Over: MASCOMA RIVER

.07 MI. FROM JCT. US 4, Grafton, NH

Built 1985 Load: 33.5 t ADT: 2,334

ASHLAND ROAD

Good

Over: I-95 RAMPS

AUX. ENTRANCE TO PAFB, Rockingham, NH

Built 1972 Load: 33.5 t

GREEN ROAD

Good

Over: NH101

1.3 MI E OF CANDIA TL, Rockingham, NH

Built 1982 Load: 33.5 t ADT: 516

NORTH MASON ROAD

Good

Over: SPAULDING BROOK

1.7 MI FROM MASON TL, Hillsborough, NH

Built 1988 Load: 33.6 t ADT: 187

NH 12A

Good

Over: MILL BROOK

2.8 MI FROM CLAREMONT TL, Sullivan, NH

Built 1937 Load: 33.6 t ADT: 2,056

TUFTONBORO ROAD

Good

Over: BEECH RIVER

0.7 MI. TUFTONBORO TL, Carroll, NH

Built 1997 Load: 33.6 t ADT: 90

PACKERS FALLS ROAD

Good

Over: LAMPREY RIVER

1.1 MI. NEWMARKET TL, Strafford, NH

Built 1912 Load: 33.7 t ADT: 1,347

Showing 1,301-1,350 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.