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

Fair-condition bridges (524)

MD 695

Fair

Over: MD 151

I-695 AT MD 151, Baltimore, MD

Built 1995 Load: 63.0 t ADT: 21,732

IS 795 SBR

Fair

Over: CSX TRANSPORTATION

0.71 MILE NORTH OF IS 695, Baltimore, MD

Built 1983 Load: 63.5 t ADT: 110,982

COWPENS AVENUE

Fair

Over: MINEBANK RUN

0.11 M N OF CROMWEL BR RD, Baltimore, MD

Built 1968 Load: 63.5 t ADT: 7,165

IS 695 RAMP A

Fair

Over: HERBERT RUN

RP 3 TO LEEDS AVE, Baltimore, MD

Built 1957 Load: 64.4 t ADT: 4,779

MD 43 EBR

Fair

Over: IS 695 OL

0.97 MILE WEST OF US 1, Baltimore, MD

Built 1989 Load: 64.4 t ADT: 35,082

US 40 EBR

Fair

Over: GUNPOWDER FALLS

0.31 MI W OF JONES RD, Baltimore, MD

Built 1935 Load: 64.8 t ADT: 14,805

US 40 WBR

Fair

Over: GUNPOWDER FALLS

0.31 MI W OF JONES RD, Baltimore, MD

Built 1935 Load: 64.8 t ADT: 14,805

MD 122

Fair

Over: IS 695 RAMP 1

0.45 MI N OF IS 70, Baltimore, MD

Built 1961 Load: 64.9 t ADT: 34,910

KERNAN DRIVE

Fair

Over: DEAD RUN

50 FT E SECURITY BLVD, Baltimore, MD

Built 1948 Load: 64.9 t ADT: 11,216

RUXTON ROAD

Fair

Over: ROLAND RUN

0.42 MI E OF MD 134, Baltimore, MD

Built 1959 Load: 64.9 t ADT: 6,375

IS 83

Fair

Over: WESTERN RUN

0.81 M S OF BR NO 0305600, Baltimore, MD

Built 1953 Load: 65.3 t ADT: 60,263

MILFORD MILL ROAD

Fair

Over: GWYNNS FALLS

250 FT E SCOTTS HILL DR, Baltimore, MD

Built 1983 Load: 65.3 t ADT: 24,976

WEYBURN ROAD

Fair

Over: REDHOUSE RUN

300 FT W. OF ELLINWOOD RD, Baltimore, MD

Built 1963 Load: 66.2 t ADT: 4,687

OLD COURT ROAD

Fair

Over: BENS RUN

0.4 MI SOUTH OF MD 26, Baltimore, MD

Built 1972 Load: 66.4 t ADT: 8,650

MD 146

Fair

Over: LITTLE GUNPOWDER FALLS

ON HARFORD CO LINE, Baltimore, MD

Built 1931 Load: 67.1 t ADT: 13,621

IS 695 IL

Fair

Over: GWYNNS FALLS

0.12 MILE NORTH OF IS 795, Baltimore, MD

Built 1961 Load: 67.1 t ADT: 188,352

IS 195 SBR

Fair

Over: FRANCIS AVENUE

0.35 MILE SOUTH OF IS 95, Baltimore, MD

Built 1969 Load: 67.1 t ADT: 41,831

BRENBROOK DRIVE

Fair

Over: SCOTTS LEVEL BRANCH

0.67 MI N OF MD 26, Baltimore, MD

Built 1982 Load: 67.1 t ADT: 13,165

FALLS ROAD

Fair

Over: GRAVES RUN

0.6 MI N OF BECKLEYSVILLE, Baltimore, MD

Built 1991 Load: 67.1 t ADT: 1,846

IS 83 NBR

Fair

Over: TIMONIUM ROAD

1.005 MI N OF MD 131, Baltimore, MD

Built 1954 Load: 68.0 t ADT: 137,301

IS 83 SBR

Fair

Over: TIMONIUM ROAD

1.005 MI N OF MD 131, Baltimore, MD

Built 1954 Load: 68.0 t ADT: 137,301

CORBETT ROAD

Fair

Over: GUNPOWDER FALLS

1.0 MI NW OF CARROLL ROAD, Baltimore, MD

Built 1945 Load: 68.9 t ADT: 1,149

MD 700

Fair

Over: US 40

1.89 MI N OF MD 150, Baltimore, MD

Built 1941 Load: 69.8 t ADT: 8,661

MD 45

Fair

Over: NCR TRAIL

0.12 MI N OF FREDERICK RD, Baltimore, MD

Built 1930 Load: 70.3 t ADT: 5,350

LONGNECKER ROAD

Fair

Over: SLADE RUN

0.74 MI N OF MD 128, Baltimore, MD

Built 1920 Load: 70.7 t ADT: 315

IS 695 & BELMONT A

Fair

Over: DEAD RUN

0.66 M N OF SECURITY BLVD, Baltimore, MD

Built 1961 Load: 73.5 t ADT: 206,852

IS 795 RAMP 4

Fair

Over: IS 795 RAMP NBR 10

0.43 MI S OF MD 940, Baltimore, MD

Built 1986 Load: 73.5 t ADT: 15,802

BUCKINGHAM ROAD

Fair

Over: GWYNNS FALLS

0.4 MI NE LIBERTY RD, Baltimore, MD

Built 1972 Load: 76.2 t ADT: 2,209

I-695 OL

Fair

Over: PENINSULA EXPRESSWAY

1.2 MI W OF MD 151, Baltimore, MD

Built 1998 Load: 76.2 t ADT: 11,760

RED RUN BOULEVARD

Fair

Over: RED RUN

0.6 MI SOUTH OF I-795, Baltimore, MD

Built 1997 Load: 77.5 t ADT: 10,305

INDIA AVENUE

Fair

Over: COULTON RUN

0.13 MI WEST OF US RT. 1, Baltimore, MD

Built 1978 Load: 79.8 t ADT: 100

RASPE AVENUE

Fair

Over: REDHOUSE CREEK

0.79 MILES EAST OF US 1, Baltimore, MD

Built 1948 Load: 81.6 t ADT: 604

EBENEZER ROAD

Fair

Over: WHITE MARSH RUN

0.22 MI S OF US 40, Baltimore, MD

Built 1988 Load: 83.4 t ADT: 12,715

MD 145

Fair

Over: GREENE BRANCH

0.73 MILE W OF COOPER RD, Baltimore, MD

Built 1929 Load: 87.1 t ADT: 12,712

BEAVER DAM ROAD

Fair

Over: GOODWIN RUN

0.30 MI. N OF PADONIA RD., Baltimore, MD

Built 1997 Load: 87.1 t ADT: 10,960

MD 25

Fair

Over: INDIAN RUN

0.55 MI S OF MD 88, Baltimore, MD

Built 1979 Load: 99.9 t ADT: 8,321

MD 25

Fair

Over: BEAVERDAM RUN

2.5 MI N OF MD 131, Baltimore, MD

Built 1993 Load: 99.9 t ADT: 5,031

IS 70 RAMPS 3 &

Fair

Over: DEAD RUN

@ I-695 & I-70 INTERCHANG, Baltimore, MD

Built 1961 Load: 99.9 t ADT: 188,860

IS 695 & COUNTY RO

Fair

Over: SCOTTS LEVEL BRANCH

0.063 M N MILFORD MILL RD, Baltimore, MD

Built 1961 Load: 99.9 t ADT: 189,237

IS 695

Fair

Over: SLAUGHTERHOUSE BRANCH

0.72 MILE SOUTH OF MD 25, Baltimore, MD

Built 1961 Load: 99.9 t ADT: 176,700

I 695 & RAMPS 5

Fair

Over: BRANCH OF ROLAND RUN

0.33 MILE WEST OF MD 139, Baltimore, MD

Built 1955 Load: 99.9 t ADT: 179,082

I 70 RAMPS 4 &

Fair

Over: DEAD RUN

@ I-695 & I-70 INTERCHANG, Baltimore, MD

Built 1961 Load: 99.9 t ADT: 35,422

IS 70 RAMPS 3 &

Fair

Over: DEAD RUN

IS 70 WB TO IS 695 IL, Baltimore, MD

Built 1961 Load: 99.9 t ADT: 39,171

IS 83

Fair

Over: OWL BRANCH

1.11 MILE SOUTH OF MD 45, Baltimore, MD

Built 1958 Load: 99.9 t ADT: 50,431

IS 95

Fair

Over: EAST BRANCH HERBERT RUN

0.05 MILE SOUTH OF US 1, Baltimore, MD

Built 1969 Load: 99.9 t ADT: 176,796

US 1

Fair

Over: WHITEMARSH RUN

0.24 MI N OF MD 43, Baltimore, MD

Built 1971 Load: 99.9 t ADT: 35,092

MD 146

Fair

Over: LONG QUARTER BRANCH

0.89 MILE NORTH OF IS 695, Baltimore, MD

Built 1979 Load: 99.9 t ADT: 15,952

MD 43

Fair

Over: BRANCH OF WHITEMARSH RUN

0.46 MILE WEST OF IS 95, Baltimore, MD

Built 1979 Load: 99.9 t ADT: 53,732

IS 695 RAMP 1

Fair

Over: BRANCH OF GWYNNS FALLS

.287 M N OF OLD COURT RD, Baltimore, MD

Built 1982 Load: 99.9 t ADT: 34,582

IS 795

Fair

Over: BRANCH OF GWYNNS FALLS

1.04 MI N OF MCDONOUGH RD, Baltimore, MD

Built 1984 Load: 99.9 t ADT: 110,982

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.