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

Poor-condition bridges (25)

TUFTON AVENUE

Poor

Over: WATERSPOUT RUN

2.63 MI. WEST MD 25, Baltimore, MD

Built 1920 Load: 7.7 t ADT: 7,735

MOHRS LANE

Poor

Over: CSX RAILROAD

0.1 MI NW OF US RTE 40, Baltimore, MD

Built 1912 Load: 9.1 t ADT: 1,600

DOGWOOD ROAD

Poor

Over: DOGWOOD RUN

200 SW OF HOLLIFIELD RD, Baltimore, MD

Built 1929 Load: 13.6 t ADT: 3,062

PINEY GROVE ROAD

Poor

Over: CSX RAILROAD

0.1 MI SE OF OLD HANOVER, Baltimore, MD

Built 1907 Load: 14.1 t ADT: 551

WILDWOOD AVENUE

Poor

Over: TRIBUTARY TO HERRING RUN

0.12 MI E OF OAKLEIGH AVE, Baltimore, MD

Built 1960 Load: 15.4 t ADT: 200

MANTUA MILL ROAD

Poor

Over: DEADMAN RUN

0.7 MI N OF TUFTON AVE, Baltimore, MD

Built 1930 Load: 17.2 t ADT: 388

PUTTY HILL AVENUE

Poor

Over: IS 695

@ IS 695, Baltimore, MD

Built 1961 Load: 20.0 t ADT: 12,400

HARRIS MILL ROAD

Poor

Over: LITTLE DEER CREEK

0.12 MI E OF LENTZ RD, Baltimore, MD

Built 1920 Load: 20.4 t ADT: 734

PHOENIX ROAD

Poor

Over: GUNPOWDER FALLS

1.3 MI E YORK RD, Baltimore, MD

Built 1922 Load: 21.8 t ADT: 2,132

STABLERS CHURCH RO

Poor

Over: LITTLE FALLS

1.0 MI W OF YORK RD, Baltimore, MD

Built 1975 Load: 22.7 t ADT: 690

SPARKS ROAD

Poor

Over: GUNPOWDER FALLS

0.5 MI E OF YORK RD, Baltimore, MD

Built 1888 Load: 23.1 t ADT: 1,100

WALKER ROAD

Poor

Over: LITTLE FALLS

200 FT S STABLERS CHURCH, Baltimore, MD

Built 1915 Load: 25.4 t ADT: 548

ROLLING ROAD

Poor

Over: TRIBUTARY TO DEAD RUN

0.68 MI N OF IS 70, Baltimore, MD

Built 1961 Load: 25.8 t ADT: 34,803

GLEN ARM ROAD

Poor

Over: LONG GREEN CREEK

1.52 MILES NW OF MD 147, Baltimore, MD

Built 1987 Load: 26.3 t ADT: 7,740

GOLDEN RING ROAD

Poor

Over: STEMMERS RUN

0.05 MI N OF OREMS RD, Baltimore, MD

Built 1933 Load: 27.2 t ADT: 3,841

ROSSVILLE BOULEVAR

Poor

Over: AMTRAK AND OREMS ROAD

0.8 MI SE OF PULASKI HWY, Baltimore, MD

Built 1971 Load: 34.0 t ADT: 20,575

DOUBLE ROCK ACCESS

Poor

Over: STEMMERS RUN

0.1 MILES NW OF BELAIR RD, Baltimore, MD

Built 1950 Load: 34.5 t

OLD COURT ROAD

Poor

Over: GWYNNS FALLS AND MTA MET

1.1 MI SW OF MD RTE 140, Baltimore, MD

Built 1961 Load: 36.3 t ADT: 16,335

IS 70

Poor

Over: INGLESIDE AVENUE

0.3 MI W OF BALTO CITY, Baltimore, MD

Built 1968 Load: 42.6 t ADT: 15,410

HAMMONDS FERRY ROA

Poor

Over: CSX RAILROAD

50 FT N LANSDOWNE RD, Baltimore, MD

Built 1961 Load: 43.5 t ADT: 7,077

PENINSULA EXPRESSW

Poor

Over: CSX RAILROAD

0.5 MI E MERRITT BLVD, Baltimore, MD

Built 1960 Load: 48.1 t ADT: 11,183

PENINSULA EXPRESSW

Poor

Over: CSX RAILROAD

0.5 MI E MERRITT BLVD, Baltimore, MD

Built 1960 Load: 48.1 t ADT: 11,183

CLIPPER MILL ROAD

Poor

Over: PRETTYBOY RESERVOIR

0.3 MI E GUNPOWDER RD, Baltimore, MD

Built 1931 Load: 48.1 t ADT: 302

LANSDOWNE BOULEVAR

Poor

Over: CSX RAILROAD

50 FT W HAMMONDS FERRY RD, Baltimore, MD

Built 1964 Load: 50.8 t ADT: 7,620

KING AVENUE

Poor

Over: BRANCH OF WHITE MARSH RU

0.5 MI NW OF SR 7, Baltimore, MD

Built 1978 Load: 99.9 t ADT: 18,643

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

Related

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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.