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 151

Fair

Over: MD 695

1.01 MILES N OF MD 20B, Baltimore, MD

Built 1971 Load: 37.6 t ADT: 15,651

I-895 NB

Fair

Over: AMTRAK

Milepost M2.0, Baltimore, MD

Built 1957 Load: 37.6 t ADT: 7,507

IS 95 RAMP 5

Fair

Over: IS 195 NBR

0.79 MI N OF HOWARD CO, Baltimore, MD

Built 1970 Load: 38.1 t ADT: 8,984

IS 95 NBR

Fair

Over: OAKLAND ROAD

0.76 MILE NORTH OF IS 195, Baltimore, MD

Built 1969 Load: 38.1 t ADT: 176,796

MD 158

Fair

Over: MUD FLATS

1.44 MILE WEST OF MD 151, Baltimore, MD

Built 1976 Load: 38.1 t ADT: 12,161

SUSSEX ROAD

Fair

Over: TRIBUTARY TO GWYNNS FALL

0.07 MI N OF MD 26, Baltimore, MD

Built 1969 Load: 38.1 t ADT: 442

MD 7

Fair

Over: LITTLE GUNPOWDER FALLS

ON HARFORD CO LINE, Baltimore, MD

Built 1928 Load: 38.5 t ADT: 8,520

MD 128

Fair

Over: SLADE RUN

3.05 MI E OF MD 30, Baltimore, MD

Built 1990 Load: 38.5 t ADT: 2,991

RUXTON ROAD

Fair

Over: JONES FALLS

0.02 MI W OF MD 25, Baltimore, MD

Built 1961 Load: 38.5 t ADT: 5,329

IS 70 EBR

Fair

Over: ROLLING ROAD

0.54 MILE WEST OF IS 695, Baltimore, MD

Built 1964 Load: 38.5 t ADT: 94,221

MT. WILSON LANE

Fair

Over: GWYNNS FALLS

0.03 MI S OF MD 400, Baltimore, MD

Built 1973 Load: 38.5 t ADT: 1,800

MD 25

Fair

Over: JONES FALLS

0.06 MILE SOUTH OF MD 133, Baltimore, MD

Built 1932 Load: 39.0 t ADT: 10,911

US 40

Fair

Over: STEMMERS RUN

0.39 MILES EAST OF I-695, Baltimore, MD

Built 1935 Load: 39.0 t ADT: 54,850

IS 95 SBR

Fair

Over: IS 695 RAMP C

0.68 MILE NORTH OF US 1, Baltimore, MD

Built 1969 Load: 39.0 t ADT: 176,796

FRANCIS AVENUE

Fair

Over: WEST BRANCH OF HERBERT R

0.06 MI W OF OREGON AVE, Baltimore, MD

Built 1955 Load: 39.0 t ADT: 8,130

OWINGS MILLS BOULE

Fair

Over: REISTERSTOWN ROAD (MD 14

0.4 MI NW OF OWINGS MILLS, Baltimore, MD

Built 1986 Load: 39.0 t ADT: 29,024

IS 95 RAMP 5

Fair

Over: IS 695

0.84 MI N OF US 1, Baltimore, MD

Built 1969 Load: 39.5 t ADT: 12,942

IS 83 SBR

Fair

Over: GUNPOWDER FALLS

1.92 M N OF MD 137, Baltimore, MD

Built 1958 Load: 39.5 t ADT: 59,820

IS 70

Fair

Over: MD 122

0.04 MI W OF BALT CITY, Baltimore, MD

Built 1968 Load: 39.5 t ADT: 12,590

MD 702 WBR

Fair

Over: NORTHEAST CREEK

0.10 MILE WEST OF MD 695, Baltimore, MD

Built 1972 Load: 39.5 t ADT: 19,406

CEDAR AVENUE

Fair

Over: IS 195

0.24 MI N OF MD 466, Baltimore, MD

Built 1972 Load: 39.5 t ADT: 2,664

MD 695 IL

Fair

Over: NORFOLK SRN RR MORSE LN

0.37 MILE SOUTH OF MD 151, Baltimore, MD

Built 1974 Load: 39.5 t ADT: 34,762

IS 795 RAMP G

Fair

Over: IS 695 RAMP B

1.55 MI S OF MD 37, Baltimore, MD

Built 1983 Load: 39.5 t ADT: 110,982

BEAVER DAM ROAD

Fair

Over: BEAVER DAM RUN

0.1 MI N COCKEYSVILLE RD, Baltimore, MD

Built 1976 Load: 39.5 t ADT: 27,012

BLACK FRIARS ROAD

Fair

Over: TRIBUTARY TO DEAD RUN

0.06 MI S OF CHESWORTH RD, Baltimore, MD

Built 1960 Load: 39.5 t ADT: 400

I-895 SB

Fair

Over: AMTRAK

Milepost M2.0, Baltimore, MD

Built 1957 Load: 39.5 t ADT: 8,846

IS 695

Fair

Over: DOGWOOD ROAD

1.12 MILE NORTH OF IS 70, Baltimore, MD

Built 1961 Load: 39.9 t ADT: 203,902

MD 695 OL

Fair

Over: MD 695 RMP 1(MERRITT BL)

0.26 MILE SOUTH OF MD 151, Baltimore, MD

Built 1966 Load: 39.9 t ADT: 41,012

MD 695 RAMP 4F

Fair

Over: FORCE MAIN

0.19 MI E OF MD 695, Baltimore, MD

Built 1973 Load: 39.9 t ADT: 5,141

ILCHESTER ROAD

Fair

Over: PATAPSCO RIVER

1.58 MI S OF MD RTE 144, Baltimore, MD

Built 1955 Load: 39.9 t ADT: 2,052

CORBETT ROAD

Fair

Over: CARROLL BRANCH

0.29 MI E OF CARROLL ROAD, Baltimore, MD

Built 1922 Load: 39.9 t ADT: 252

OWINGS MILLS BOULE

Fair

Over: GWYNNS FALLS

1 MI N OF MD 140, Baltimore, MD

Built 1989 Load: 39.9 t ADT: 29,343

IS 83 NBR

Fair

Over: OLD PIMLICO ROAD

0.95 MI S OF MD 25, Baltimore, MD

Built 1962 Load: 40.4 t ADT: 96,870

IS 83 SBR

Fair

Over: OLD PIMLICO ROAD

0.95 MI S OF MD 25, Baltimore, MD

Built 1962 Load: 40.4 t ADT: 96,870

IS 695

Fair

Over: MD 41

1.06 MILE NORTH OF MD 542, Baltimore, MD

Built 1961 Load: 40.4 t ADT: 157,940

IS 95 RAMP 3

Fair

Over: IS 695

0.84 MI N OF US 1, Baltimore, MD

Built 1969 Load: 40.4 t ADT: 26,722

MD 7

Fair

Over: MD 43

0.52 M W OF BR NO 0301400, Baltimore, MD

Built 1963 Load: 40.4 t ADT: 16,450

BEACHWOOD ROAD

Fair

Over: MD 695

1.78 MI N OF MD 20D, Baltimore, MD

Built 1970 Load: 40.4 t ADT: 999

MD 695 IL

Fair

Over: AMTRAK

1.12 MILE NORTH OF MD 702, Baltimore, MD

Built 1972 Load: 40.4 t ADT: 74,892

MANTUA MILL ROAD

Fair

Over: WESTERN RUN

0.1 MI S GREEN RD, Baltimore, MD

Built 1981 Load: 40.4 t ADT: 743

I-95

Fair

Over: REDHOUSE RUN

0.6 MI S OF MD 588, Baltimore, MD

Built 1960 Load: 40.4 t ADT: 168,940

IS 695

Fair

Over: CROMWELL BRIDGE ROAD

0.17 MILE WEST OF MD 542, Baltimore, MD

Built 1957 Load: 40.8 t ADT: 149,261

MD 45

Fair

Over: FOURTH MINE BRANCH

0.14 M N OF BR NO 0304600, Baltimore, MD

Built 1930 Load: 40.8 t ADT: 5,340

IS 795 RAMP 3

Fair

Over: IS 695 MTA METRO

@ IS 795 & IS 695, Baltimore, MD

Built 1983 Load: 40.8 t ADT: 69,900

JEROME JAY DRIVE

Fair

Over: BEAVERDAM RUN BAISMAN R

0.3 MI SE OF IVY HILL RD, Baltimore, MD

Built 1988 Load: 40.8 t ADT: 700

NEW FORGE ROAD

Fair

Over: I-95

Milepost M69.7, Baltimore, MD

Built 1990 Load: 40.8 t ADT: 2,862

IS 83

Fair

Over: BELFAST ROAD

1.09 MI S OF COLD BOT RD, Baltimore, MD

Built 1955 Load: 41.3 t ADT: 62,891

IS 83 NBR

Fair

Over: SHAWAN ROAD EBR

0.91 MI N OF BEAVERDAM RD, Baltimore, MD

Built 1953 Load: 41.3 t ADT: 33,380

IS 195 WBR

Fair

Over: US 1

0.58 MI N OF AA CO LINE, Baltimore, MD

Built 1987 Load: 41.3 t ADT: 41,831

GLEN FALLS ROAD

Fair

Over: TRIBUTARY TO NORTH BRANC

ON CARROLL COUNTY LINE, Baltimore, MD

Built 2008 Load: 41.3 t ADT: 214

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.