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

NH112

Fair

Over: WILD AMMONOOSUC RIVER

1.3 MI WEST OF EASTON TL, Grafton, NH

Built 1932 Load: 23.5 t ADT: 1,061

NH 25A

Fair

Over: CONNECTICUT RIVER

VERMONT STATE LINE, Grafton, NH

Built 1937 Load: 23.5 t ADT: 3,554

GREENHILL ROAD

Fair

Over: ISINGLASS RIVER

3.1 MI FR DOVER TL, Strafford, NH

Built 1955 Load: 23.6 t ADT: 2,031

NH 12 NH101

Fair

Over: ASHUELOT RIVER PED TRAIL

1.0 MI. FROM KEENE CENTER, Cheshire, NH

Built 1961 Load: 23.6 t ADT: 22,443

FDR 381

Fair

Over: TUTTLE BROOK

MAP 10, Grafton, NH

Built 1980 Load: 23.7 t ADT: 50

FDR 211

Fair

Over: E.BR. BAKER RIVER

MAP 36, Grafton, NH

Built 1976 Load: 23.7 t ADT: 100

BASE STATION ROAD

Fair

Over: AMMONOOSUC RIVER

4.3 MI NE US302, Coos, NH

Built 1937 Load: 23.9 t ADT: 1,775

CANAL STREET

Fair

Over: NASHUA RIVER

0.6 MI FROM ROUTE 3, Hillsborough, NH

Built 1928 Load: 23.9 t ADT: 14,567

CUTLER ROAD

Fair

Over: BLOODS BROOK

175 FT FR BLOODBROOK RD, Sullivan, NH

Built 1940 Load: 23.9 t ADT: 90

NH202A

Fair

Over: ISINGLASS RIVER

2.5 MI FROM NORTHWOOD TL, Strafford, NH

Built 1923 Load: 23.9 t ADT: 2,179

NH101

Fair

Over: THORNTONS FERRY ROAD

2.3 MI MILFORD TL, Hillsborough, NH

Built 1971 Load: 24.0 t ADT: 11,617

NORTH WILMOT ROAD

Fair

Over: KIMPTON BROOK

0.04MI NH4A, Merrimack, NH

Built 1968 Load: 24.0 t ADT: 371

FDR 15

Fair

Over: TRIB. TO AMMONOOSUC

MAP 02, Coos, NH

Built 1949 Load: 24.0 t ADT: 99

NO DATA ENTERED

Fair

Over: LOUISEVILLE BROOK

MAP 32, Carroll, NH

Built 1953 Load: 24.0 t ADT: 50

NH 11

Fair

Over: BK BAY LA WINNIPESAUKEE

0.25 MI N ALTON BAY, Belknap, NH

Built 1942 Load: 24.1 t ADT: 6,245

NH 13

Fair

Over: S BR PISCATAQUOG RIVER

0.8 MI S OF JCT RTE 136, Hillsborough, NH

Built 1947 Load: 24.1 t ADT: 4,777

GOVE ROAD

Fair

Over: FOWLER RIVER

0.1 MI FR NO RIVER RD, Grafton, NH

Built 1965 Load: 24.3 t ADT: 90

US 3

Fair

Over: MAPLE ST NHRR

2.3 MI FROM LACONIA T.L., Belknap, NH

Built 1947 Load: 24.3 t ADT: 17,678

SHARON ROAD

Fair

Over: CONTOOCOOK RIVER

1.28 MI SHARON TL, Hillsborough, NH

Built 1925 Load: 24.3 t ADT: 636

NH103

Fair

Over: WARNER RIVER

SUTTON TL, Merrimack, NH

Built 1936 Load: 24.3 t ADT: 3,704

NH103

Fair

Over: WARNER RIVER

0.1 MI FROM JCT I-89, Merrimack, NH

Built 1936 Load: 24.3 t ADT: 3,704

NH 31

Fair

Over: CONTOOCOOK RIVER

1.24 MI. NE HANCOCK TL, Hillsborough, NH

Built 1934 Load: 24.5 t ADT: 1,650

BOND STREET

Fair

Over: NISSITISSIT RIVER

2.15 MI FROM MASS. SL, Hillsborough, NH

Built 1946 Load: 24.5 t ADT: 937

CROSS ROAD

Fair

Over: CATSBANE BROOK

TOWN RD, Cheshire, NH

Built 1963 Load: 24.5 t ADT: 539

CITIZENS STREET

Fair

Over: SUGAR RIVER

100 FT JCT RTE 12, Sullivan, NH

Built 1959 Load: 24.5 t ADT: 1,325

RIVER ROAD

Fair

Over: SACO RIVER

2.1 MI FROM BARTLETT TL, Carroll, NH

Built 1950 Load: 24.5 t ADT: 4,565

FORBES MTN ROAD

Fair

Over: WILD MEADOW BROOK

2.2 MI FR NORTH RD, Merrimack, NH

Built 1950 Load: 24.5 t ADT: 90

NORTH ROAD

Fair

Over: SMITH RIVER

.36 MI. NW JCT. 104 AND 4, Merrimack, NH

Built 1936 Load: 24.5 t ADT: 501

US 4

Fair

Over: NHRR(ABD)

2.4 MI FROM WILMOT TL, Merrimack, NH

Built 1937 Load: 24.5 t ADT: 2,454

SEVEN ISLANDS BR

Fair

Over: ANDROSCOGGIN RIVER

Adjacent to Errol 071/030, Coos, NH

Built 1951 Load: 24.5 t

NH 11B

Fair

Over: GUNSTOCK RIVER

0.3 MI N JCT NH 11-A, Belknap, NH

Built 1931 Load: 24.5 t ADT: 2,650

NH 11A

Fair

Over: POOR FARM BROOK

5.9 MI EAST LACONIA TL, Belknap, NH

Built 1936 Load: 24.5 t ADT: 5,198

NH 16

Fair

Over: PEABODY RIVER

1.1 MI NE MARTINS LOC TL, Coos, NH

Built 1950 Load: 24.5 t ADT: 4,107

US202 NH 9

Fair

Over: HATFIELD ROAD

.7 MI EAST HENNIKER T.L., Merrimack, NH

Built 1961 Load: 24.5 t ADT: 16,732

US202

Fair

Over: MOUNTAIN BROOK

1.0 MI TO RINDGE TL, Cheshire, NH

Built 1939 Load: 24.5 t ADT: 8,103

NH152

Fair

Over: LAMPREY RIVER

1.0 MI FROM NEWMARKET TL, Strafford, NH

Built 1933 Load: 24.5 t ADT: 1,860

CLOUGH HILL ROAD

Fair

Over: SOUCOOK RIVER

0.1 MI FR NH 106, Merrimack, NH

Built 1960 Load: 24.5 t ADT: 1,627

NH 10 NH123

Fair

Over: ASHUELOT RIVER

3.0 MI FROM GILSUM TL, Cheshire, NH

Built 1949 Load: 24.5 t ADT: 2,419

NH 13

Fair

Over: S BR PISCATAQUOG RIVER

.1 MI FROM JCT RT 136, Hillsborough, NH

Built 1937 Load: 24.5 t ADT: 3,692

NH 1B

Fair

Over: PISCATAQUA ESTUARY

1.1 MI FROM JCT RT 1A, Rockingham, NH

Built 1955 Load: 24.5 t ADT: 2,973

MORRISON ROAD

Fair

Over: CONTOOCOOK RIVER

0.8 MI FR OLD SHARON RD9, Hillsborough, NH

Built 1958 Load: 24.5 t ADT: 1,387

YEATON ROAD

Fair

Over: SPENCER BROOK

0.9 MI N JCT NH 3-A, Grafton, NH

Built 1919 Load: 24.5 t ADT: 307

EPPING STREET

Fair

Over: LAMPREY RIVER

0.3 MI FROM NH RTE 107, Rockingham, NH

Built 1948 Load: 24.5 t ADT: 2,762

NH 12

Fair

Over: NHRR(ABD)

.5 MI E WESTMORELAND TL, Cheshire, NH

Built 1948 Load: 24.5 t ADT: 8,010

NH112

Fair

Over: SABBADAY BROOK

0.8 MI WEST OF ALBANY TL, Grafton, NH

Built 1953 Load: 24.5 t ADT: 5,273

NH112 LOST RIV RD

Fair

Over: LOST RIVER

1.9 MI W OF JCT RT 118, Grafton, NH

Built 1957 Load: 24.5 t ADT: 1,652

ACCESS ROAD

Fair

Over: JOE ENGLISH BROOK

0.8 MILES FROM ON-ORBIT D, Hillsborough, NH

Built 2008 Load: 24.5 t ADT: 10

FDR 30

Fair

Over: MAD RIVER

MAP 38, Grafton, NH

Built 1949 Load: 24.6 t ADT: 50

NH101

Fair

Over: JOE ENGLISH BROOK

1.15 MI SW BEDFORD TL, Hillsborough, NH

Built 1936 Load: 24.7 t ADT: 17,501

US202

Fair

Over: CSX

.1 MI. WEST OF JCT I-93, Merrimack, NH

Built 1949 Load: 24.7 t ADT: 44,531

Showing 251-300 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.