County profile · official public datasets

Baltimore County, MD

783 public highway bridges tracked in the FHWA National Bridge Inventory: 29.9% rated Good, 66.9% Fair, 3.2% Poor.

783
Public bridges
29.9%
Good condition
3.2%
Poor condition

The verdict

According to the Federal Highway Administration's 2024 National Bridge Inventory.

Baltimore County posts a better-than-median Poor-condition share among rated counties in the state across large county bridge inventory.

Top 33%
lowest Poor share in state
3.2%
Poor-condition share
783
public highway bridges
1971
avg year built

Poor is an FHWA condition category from the lowest applicable component rating (4 or below), not a live crossing-safety or closure decision. Rankings cover counties with at least five public highway bridges.

Baltimore County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Baltimore County ranks #8 of 24 Maryland counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 3.2%). Baltimore County, Maryland contains 783 public highway bridges. Roughly 29.9% are rated “Good,” 66.9% “Fair,” and 3.2% “Poor.” Poor means the lowest applicable deck, superstructure, substructure, or culvert rating is 4 or below on the 0–9 NBI scale. It is a condition category, not a live safety or closure decision.

Responsible agencies inspect covered bridges on risk-based intervals under current NBIS rules and submit inventory data to FHWA annually. The list below shows every NBI-tracked bridge in the county. Use the “Sort by” controls to change the ordering, and click any row for its reported inspection date, traffic count, and condition fields.

Source: FHWA National Bridge Inventory. See methodology for full definitions.

Total bridges

783

Public highway bridges in Baltimore County

Good condition

29.9%

234 of 783 rated 7-9

Fair condition

66.9%

524 of 783 rated 5-6

Poor condition

3.2%

25 of 783 rated 4 or below

In-state Poor-share rank

#8 of 24

Among Maryland counties with 5+ bridges, lower share ranks better

Condition distribution

Share of 783 NBI-tracked bridges by lowest applicable component rating.

Good
29.9% (234)
Fair
66.9% (524)
Poor
3.2% (25)

Baltimore County's Poor-condition bridges carry 185,852 vehicle crossings a day

That is 0.8% of the county's reported daily bridge traffic on 3.1% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 7,744 crossings a day against 25,748 for a Good-condition one. A Poor rating is a condition category, not a closure or a live safety judgement; it means the lowest applicable component rating is 4 or below.

Computed over the 782 of 783 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

55.8% of Baltimore County's bridges have passed the 50-year mark

437 of the 783 bridges with a recorded construction year were built in 1974 or earlier. Age alone is not a defect: a well-maintained older bridge can rate Good, and 29.9% of this county's inventory does. Even so, this older cohort is the population from which future Poor ratings are drawn, which is why the age profile below matters alongside the condition split above.

Cutoff derives from the 2024 release year minus a 50-year design life. Source: FHWA National Bridge Inventory, 2024 release.

One structure carries 18.7% of the county's Poor-condition bridge traffic

ROLLING ROAD over TRIBUTARY TO DEAD RUN, built 1961, carries 34,803 vehicles a day, the most of any Poor-rated structure here. The county's Poor-condition exposure is concentrated rather than evenly spread, so the 25-bridge count understates how much of the daily burden sits on a single crossing.

Share is of the 185,852 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

When Baltimore County's bridges were built

783 bridges with a recorded construction year, grouped by decade

bridges

What this shows Construction peaked in the 1960s, when 152 of the county's bridges still in the inventory were built, which is 19.4% of those with a recorded year. That cohort is now 55 to 64 years old in the 2024 inventory. Its average build year (1971) matches the Maryland average (1972).

Source FHWA National Bridge Inventory (year built) As of 2024 NBI release

How Baltimore County compares with Maryland's closest counties by inventory size

The 5 Maryland counties nearest Baltimore County in number of bridges, with their condition splits. Its 3.2% Poor share is the 4th-lowest of these 6. Its average build year of 1971 against a peer-group mean of 1974 is in line with the group.

Showing the 5 closest of 23 Maryland counties eligible for comparison.

Bridge inventory size and condition shares for Baltimore County and the 5 Maryland counties closest to it in inventory size
County Bridges Poor
Baltimore County (this page) 783 3.2%
Prince George's County 576 3.1%
Montgomery County 515 4.9%
Frederick County 486 2.7%
Anne Arundel County 389 1.5%
Baltimore city County 374 8.6%

Each share is of that county's own total tracked bridges; peers are the counties with 5 or more bridges whose inventory size is closest to Baltimore County's. Source: FHWA National Bridge Inventory, 2024 release.

Nationwide counties with similar inventory size or average build year

Two NBI-derived peer sets for Baltimore County, both outside Maryland so the neighborhoods are not the same-state size table above.

Similar inventory size

Nearest county inventories outside MD (783 bridges here).

Similar average build year

Nearest mean year-built outside MD (1971 here).

Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.

All 783 Good 234 Fair 524 Poor 25

All bridges (783)

IS 695 & RAMPS 4

Fair

Over: HERBERT RUN

0.021 MI S WILKENS AVENUE, Baltimore, MD

Built 1956 Load: 99.9 t ADT: 192,180

OLD VALLEY ROAD

Fair

Over: JONES FALLS

0.16 MI. S. OF MD 130, Baltimore, MD

Built 1920 Load: 99.9 t ADT: 3,531

PERRY HALL BOULEVA

Fair

Over: TRIBUTARY TO WHITE MARSH

0.1 MI N WHITE MARSH BLVD, Baltimore, MD

Built 1981 Load: 99.9 t ADT: 8,604

PERRY HALL BOULEVA

Fair

Over: WHITE MARSH RUN

0.87 MI W. EX. 67 I-95, Baltimore, MD

Built 1981 Load: 99.9 t ADT: 16,415

HONEYGO BOULEVARD

Fair

Over: WHITE MARSH RUN

0.3 MI SOUTH OF MD RTE 43, Baltimore, MD

Built 1980 Load: 99.9 t ADT: 23,813

HEATHCOTE ROAD

Fair

Over: TRIBUTARY TO BEETREE RUN

0.11 MI S OF MD 409, Baltimore, MD

Built 1974 Load: 99.9 t ADT: 135

HAZELWOOD AVENUE

Fair

Over: REDHOUSE CREEK

0.07 MILES WEST OF I-95, Baltimore, MD

Built 1959 Load: 99.9 t ADT: 12,388

LILLIAN HOLT DRIVE

Fair

Over: STEMMERS RUN

0.20 MI S. OF I695, Baltimore, MD

Built 1965 Load: 99.9 t ADT: 24,581

BEACONSFIELD DRIVE

Fair

Over: TRIBUTARY TO WHITE MARSH

.1 M E OF PERRY HALL BLVD, Baltimore, MD

Built 1975 Load: 99.9 t ADT: 11,478

HIGH FALCON ROAD

Fair

Over: TRIBUTARY TO GWYNNS FALL

0.41 MI N OF MD 140, Baltimore, MD

Built 1967 Load: 99.9 t ADT: 9,000

PADONIA ROAD

Fair

Over: MERRYMAN BRANCH

1.90 MI E OF MD RTE 45, Baltimore, MD

Built 1975 Load: 99.9 t ADT: 13,820

JOHNNYCAKE ROAD

Fair

Over: CEDAR BRANCH

CEDAR BRANCH, Baltimore, MD

Built 1975 Load: 99.9 t ADT: 3,309

GWYNNWEST ROAD

Fair

Over: TRIBUTARY TO GWYNNS FALL

1.0 MI. E OF MD 140, Baltimore, MD

Built 1996 Load: 99.9 t ADT: 1,442

HONEYGO BOULEVARD

Fair

Over: HONEYGO RUN

0.5 Mile S. of Joppa Rd., Baltimore, MD

Built 2001 Load: 99.9 t ADT: 25,109

KINTORE DRIVE

Fair

Over: TRIBUTARY TO WHITE MARSH

0.2 MI SW OF DUNFIELD RD, Baltimore, MD

Built 1975 Load: 99.9 t ADT: 2,100

EBONY ROAD

Fair

Over: TRIBUTARY TO GUNPOWDER F

2 MI NE EXIT 30 I-695, Baltimore, MD

Built 1980 Load: 99.9 t ADT: 244

BELLBECK ROAD

Fair

Over: TRIBUTARY TO GUNPOWDER F

1.4 MI N OF JOPPA RD, Baltimore, MD

Built 1980 Load: 99.9 t ADT: 200

GUNVIEW ROAD

Fair

Over: BRANCH OF GUNPOWDER FALL

0.7 MI W OF BELAIR RD, Baltimore, MD

Built 1978 Load: 99.9 t ADT: 2,323

PINEDALE DRIVE

Fair

Over: BRANCH OF GUNPOWDER FALL

0.4 MI. W OF JCT US 1, Baltimore, MD

Built 1980 Load: 99.9 t ADT: 6,723

LORD BALTIMORE DRI

Fair

Over: BRANCH OF DEAD RUN

0.5 MI N OF RT 122, Baltimore, MD

Built 1977 Load: 99.9 t ADT: 12,413

JACOBO LANE

Fair

Over: BRANCH OF HERRING RUN

0.1 MI S. OF GOUCHER BLVD, Baltimore, MD

Built 1975 Load: 99.9 t ADT: 454

SUNNYMEADOW LANE

Fair

Over: TRIBUTARY TO RED RUN

1.0 MI W OF I-795, Baltimore, MD

Built 1950 Load: 99.9 t ADT: 1,000

I-95

Fair

Over: WHITEMARSH RUN

0.44 MI S OF MD RTE 43, Baltimore, MD

Built 1962 Load: 99.9 t ADT: 181,802

I-95

Fair

Over: GUNPOWDER FALLS

3.5 MI N OF MD 43, Baltimore, MD

Built 1963 Load: 99.9 t ADT: 172,113

SUMMIT AVENUE

Good

Over: JENNIFER BRANCH

0.05 MI W OF HOMELAND AVE, Baltimore, MD

Built 1978 Load: 14.1 t ADT: 563

JERICHO ROAD

Good

Over: LITTLE GUNPOWDER FALLS

0.2 MI S JERUSALEM ROAD, Baltimore, MD

Built 1865 Load: 15.9 t ADT: 530

WARDS CHAPEL ROAD

Good

Over: LOCUST RUN

0.57 MI N OF MD 26, Baltimore, MD

Built 1969 Load: 16.3 t ADT: 7,143

HOMELAND AVENUE

Good

Over: JENNIFER BRANCH

0.2 MI E OF MD RTE 147, Baltimore, MD

Built 1978 Load: 18.1 t ADT: 660

TIVERTON ROAD

Good

Over: SCOTTS LEVEL BRANCH

0.34 MI N OF MD 26, Baltimore, MD

Built 1966 Load: 20.0 t ADT: 3,116

DAIRY ROAD

Good

Over: LITTLE FALLS

0.3 MI W OF YORK RD, Baltimore, MD

Built 1900 Load: 23.6 t ADT: 521

MD 695 OL

Good

Over: CHESACO AVENUE

0.94 MILE SOUTH OF MD 150, Baltimore, MD

Built 1970 Load: 24.0 t ADT: 69,922

VERNON ROAD

Good

Over: FIRST MINE BRANCH

0.8 MI S OF WHITE HALL RD, Baltimore, MD

Built 1988 Load: 24.9 t ADT: 666

MD 695 IL

Good

Over: CHESACO AVENUE

0.94 MILE SOUTH OF MD 150, Baltimore, MD

Built 1970 Load: 25.4 t ADT: 69,922

HOUCKS MILL ROAD

Good

Over: LITTLE GUNPOWDER FALLS

0.8 MI E. of OLD YORK RD, Baltimore, MD

Built 1989 Load: 26.3 t ADT: 869

McDONOGH ROAD

Good

Over: TRIBUTARY TO HORSEHEAD B

AT LAMBORN RD INTERSECT, Baltimore, MD

Built 2012 Load: 27.2 t ADT: 14,121

WEST LIBERTY ROAD

Good

Over: DEER CREEK

0.2 MI S OF GORSUCH RD, Baltimore, MD

Built 1992 Load: 28.1 t ADT: 348

MD 131

Good

Over: ROLAND RUN

0.874 MILE WEST OF MD 45, Baltimore, MD

Built 1992 Load: 28.5 t ADT: 12,051

WRIGHTS MILL ROAD

Good

Over: BRICE RUN

0.37 MI N OF DAVIS AVENUE, Baltimore, MD

Built 1986 Load: 28.6 t ADT: 320

COLD BOTTOM ROAD

Good

Over: BUFFALO CREEK

1.5 MI W OF I 83, Baltimore, MD

Built 1920 Load: 29.9 t ADT: 408

I-695 OL

Good

Over: BEAR CREEK

MILEPOST M46.2, Baltimore, MD

Built 1997 Load: 31.1 t ADT: 15,948

MD 145

Good

Over: GREENE BRANCH

0.3 MILE E OF COOPER ROAD, Baltimore, MD

Built 1915 Load: 32.2 t ADT: 12,432

IS 795 NBR

Good

Over: MD 940 RAMP 7

0.13 MILE NORTH OF MD 940, Baltimore, MD

Built 1985 Load: 32.7 t ADT: 68,761

OSLER DRIVE

Good

Over: TOWSON RUN

0.04 M S OF TWSNTOWN BLVD, Baltimore, MD

Built 1964 Load: 32.7 t ADT: 16,241

ROLLING ROAD

Good

Over: SCOTTS LEVEL BRANCH

0.38 MI S OF OLD COURT RD, Baltimore, MD

Built 1982 Load: 32.7 t ADT: 9,595

GILROY ROAD

Good

Over: OREGON BRANCH

0.28 MI E OF IS 83, Baltimore, MD

Built 1966 Load: 32.7 t ADT: 5,083

OWINGS MILLS BLVD

Good

Over: BRANCH OF GWYNNS FALLS

2.5 MI. NW OF JCT. SR 140, Baltimore, MD

Built 1996 Load: 32.7 t ADT: 8,600

NEW FORGE ROAD

Good

Over: TRIBUTARY TO GUNPOWDER F

0.3 MI W OF JCT SR 7, Baltimore, MD

Built 1963 Load: 32.7 t ADT: 2,500

WEST ENTRANCE

Good

Over: TRIB OF GWYNNS FALLS

MILFORD MILL METRO, Baltimore, MD

Built 1986 Load: 32.7 t ADT: 300

IS 695

Good

Over: US 1 AMTRAK LEEDS AVE

0.65 MILE NORTH OF IS 95, Baltimore, MD

Built 2004 Load: 33.4 t ADT: 197,216

VALLEY MILL ROAD

Good

Over: LITTLE FALLS

0.59 MI N OF WALKER RD, Baltimore, MD

Built 1975 Load: 34.0 t ADT: 210

Read our methodology - how this data is sourced, computed, and verified.

Related

Browse all → | Rankings →
Data sourced from official public datasets. See our methodology for details. Retrieved and formatted by PlainBridges

Every figure on PlainBridges is rendered directly from federal source data, no number is typed in by an editor. This page draws directly on federal source data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. NBI condition categories reflect the latest reported inventory record, not a live safety, closure, or travel decision.