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)

OLD INGLESIDE AVEN

Fair

Over: DEAD RUN

200 FT E SECURITY BLVD, Baltimore, MD

Built 1928 Load: 5.0 t ADT: 7,940

SHAWAN ROAD

Fair

Over: TRIBUTARY OF OREGON BRAN

0.7 MI E OF FALLS RD, Baltimore, MD

Built 1920 Load: 13.6 t ADT: 16,772

THISTLE ROAD

Fair

Over: TRIBUTARY TO PATAPSCO RI

0.57 MI S OF MD 144, Baltimore, MD

Built 1920 Load: 13.6 t ADT: 2,400

CUBA ROAD

Fair

Over: WESTERN RUN

0.3 MI S WESTERN RUN RD, Baltimore, MD

Built 1893 Load: 15.0 t ADT: 3,524

RESEARCH AVENUE

Fair

Over: TRIBUTARY TO PATAPSCO RI

0.08 MI W OF HMDS FERY RD, Baltimore, MD

Built 1955 Load: 15.0 t ADT: 224

WRIGHTS MILL ROAD

Fair

Over: GRANITE BRANCH

0.46 MI N OF DAVIS AVE, Baltimore, MD

Built 1920 Load: 15.4 t ADT: 239

MOUNT GILEAD ROAD

Fair

Over: TRIBUTARY TO NORTH BRANC

1.28 MILES NW OF MD 30, Baltimore, MD

Built 1975 Load: 16.3 t ADT: 338

RACE ROAD

Fair

Over: STEMMERS RUN

0.14 MI S OF ROSSVIL BLVD, Baltimore, MD

Built 1929 Load: 16.8 t ADT: 1,700

ROSSVILLE BOULEVAR

Fair

Over: BRIEN RUN

0.60 MI S OF US 40, Baltimore, MD

Built 1970 Load: 16.8 t ADT: 22,664

MD 45

Fair

Over: WESTERN RUN

0.75 MILE NORTH OF MD 145, Baltimore, MD

Built 1917 Load: 17.7 t ADT: 23,992

JOPPA ROAD

Fair

Over: FORMER HUTZLERS DEPARTM

E OF DULANEY VALLEY RD, Baltimore, MD

Built 1951 Load: 17.7 t ADT: 27,568

TULSMERE ROAD

Fair

Over: SCOTTS LEVEL BRANCH

0.4 MI S OF WINANDS RD, Baltimore, MD

Built 1969 Load: 17.7 t ADT: 1,844

CLEARWOOD ROAD

Fair

Over: TRIBUTARY TO HERRING RUN

0.20 MI E OF OAKLEIGH RD, Baltimore, MD

Built 1963 Load: 17.7 t ADT: 100

MASEMORE ROAD

Fair

Over: GUNPOWDER FALLS

0.6 MI SW BUNKER HILL RD, Baltimore, MD

Built 1898 Load: 18.1 t ADT: 344

MD 147

Fair

Over: BR OF LONG GREEN CREEK

0.46 MI N OF SHARON DR, Baltimore, MD

Built 1916 Load: 19.0 t ADT: 5,752

MD 128

Fair

Over: MCGILL RUN

3.00 MI W OF MD 25, Baltimore, MD

Built 1929 Load: 19.5 t ADT: 2,991

OREMS ROAD SUNNYS

Fair

Over: TRIBUTARY TO BRIEN RUN

0.1 MI NE OF ROSSVILLE BL, Baltimore, MD

Built 1970 Load: 19.5 t ADT: 5,180

OFFUTT ROAD

Fair

Over: TRIBUTARY TO BRICE RUN

0.92 MI S OF MD 26, Baltimore, MD

Built 1920 Load: 20.4 t ADT: 3,037

MD 165

Fair

Over: LITTLE GUNPOWDER FALLS

ON HARFORD CO LINE, Baltimore, MD

Built 1931 Load: 20.9 t ADT: 7,011

TRAPPE ROAD

Fair

Over: TRIBUTARY TO BEAR CREEK

0.8 MI EAST OF MD 157, Baltimore, MD

Built 1970 Load: 20.9 t ADT: 18,600

IS 95 SBR

Fair

Over: IS 195

0.81 MI N OF HOWARD CO, Baltimore, MD

Built 1970 Load: 21.3 t ADT: 176,796

MD 25

Fair

Over: DEEP RUN

0.05 MILE SOUTH OF MD 130, Baltimore, MD

Built 1961 Load: 21.8 t ADT: 26,821

MD 128

Fair

Over: CSX TRANSPORTATION

0.48 MILES EAST OF MD 30, Baltimore, MD

Built 1947 Load: 22.2 t ADT: 15,840

JOPPA ROAD

Fair

Over: MD 139

2.76 MI S OF IS 695, Baltimore, MD

Built 1958 Load: 22.2 t ADT: 7,031

RUXTON ROAD

Fair

Over: MTA LIGHT RAIL

100 FEET W OF BELLONA AVE, Baltimore, MD

Built 1960 Load: 22.2 t ADT: 9,190

DANCE MILL ROAD

Fair

Over: DULANEY VALLEY BRANCH

0.17 MI N OF DUL VALL RD, Baltimore, MD

Built 1920 Load: 22.2 t ADT: 1,195

GUNPOWDER ROAD

Fair

Over: COMPASS RUN

0.3 MI S. OF BCKLYSVIL RD, Baltimore, MD

Built 1920 Load: 22.2 t ADT: 1,755

CROMWELL VALLEY PA

Fair

Over: TRIBUTARY TO MINEBANK RU

0.4 MI. NW CROMWELL BR RD, Baltimore, MD

Built 2005 Load: 22.2 t ADT: 100

BOTTOM ROAD

Fair

Over: LITTLE GUNPOWDER FALLS

1.8 MI NE OF FORK ROAD, Baltimore, MD

Built 1886 Load: 22.7 t ADT: 223

WESTERN RUN ROAD

Fair

Over: BLACKROCK RUN

0.1 MI E OF FALLS RD, Baltimore, MD

Built 1974 Load: 22.7 t ADT: 1,230

STABLERS CHURCH RO

Fair

Over: LITTLE FALLS

0.8 MI W OF YORK ROAD, Baltimore, MD

Built 1975 Load: 22.7 t ADT: 604

MARRIOTTSVILLE RD

Fair

Over: NORTH BRANCH OF PATAPSCO

AT BALT-CARROLL CO LINE, Baltimore, MD

Built 1976 Load: 22.7 t ADT: 5,500

PATTERSON AVENUE

Fair

Over: TRIBUTARY TO GWYNNS FALL

0.75 MI NE OF LIBERTY RD, Baltimore, MD

Built 1960 Load: 22.7 t ADT: 12,265

RIPPLE ROAD

Fair

Over: TRIBUTARY TO GWYNNS FALL

0.1 MI S OF LYNN HAVEN DR, Baltimore, MD

Built 1954 Load: 22.7 t ADT: 8,752

IS 95 NBR

Fair

Over: IS 195

0.81 MI N OF HOWARD CO, Baltimore, MD

Built 1970 Load: 23.1 t ADT: 176,796

CARROLL ROAD

Fair

Over: CARROLL BRANCH

0.5 MI S OF SPARKS RD, Baltimore, MD

Built 1879 Load: 23.1 t ADT: 2,534

KIDDS SCHOOLHOUSE

Fair

Over: PRETTYBOY RESERVOIR

0.7 MI E BECKLEYS RD, Baltimore, MD

Built 1932 Load: 23.1 t ADT: 124

MD 129

Fair

Over: NORTH BRANCH

1.81 MI N OF MD 130, Baltimore, MD

Built 1900 Load: 23.6 t ADT: 900

HOLLIFIELD ROAD

Fair

Over: PATAPSCO RIVER

0.1 MI S JOHNNYCAKE ROAD, Baltimore, MD

Built 1934 Load: 23.6 t ADT: 11,453

WESTCHESTER AVENUE

Fair

Over: NO. 9 TROLLEY TRAIL

0.2 MI N FREDERICK RD, Baltimore, MD

Built 1900 Load: 23.6 t ADT: 1,741

VINEGAR HILL ROAD

Fair

Over: LITTLE GUNPOWDER FALLS

0.29 MI SE OF JERICHO RD, Baltimore, MD

Built 1894 Load: 24.0 t ADT: 552

GLENCOE ROAD

Fair

Over: GUNPOWDER FALLS

1 MI E OF YORK RD, Baltimore, MD

Built 1976 Load: 24.0 t ADT: 364

GWYNN OAK AVENUE

Fair

Over: TRIBUTARY TO DEAD RUN

0.18 MI N OF SECURITY BLV, Baltimore, MD

Built 1956 Load: 24.0 t ADT: 6,450

BACON ROAD

Fair

Over: FIRST MINE BRANCH

0.3 MI S OF HUNTER MILL R, Baltimore, MD

Built 1990 Load: 24.5 t ADT: 234

WINDEMERE PARKWAY

Fair

Over: DULANEY VALLEY BRANCH

0.1 MI S OF DULANEY VALLE, Baltimore, MD

Built 1959 Load: 24.5 t ADT: 643

FALLS ROAD

Fair

Over: CHARLES RUN

0.1 MI S MONKTON RD, Baltimore, MD

Built 1988 Load: 24.9 t ADT: 1,200

BLUE MOUNT ROAD

Fair

Over: GUNPOWDER FALLS

1.3 MI E OF MONKTON RD, Baltimore, MD

Built 1989 Load: 24.9 t ADT: 360

HUNTER MILL ROAD

Fair

Over: FIRST MINE BRANCH

0.4 MI NE OF BACON RD, Baltimore, MD

Built 1988 Load: 24.9 t ADT: 392

COCKEYSVILLE ROAD

Fair

Over: PARKS RUN

0.17 MI W OF MD 45, Baltimore, MD

Built 1949 Load: 24.9 t ADT: 3,390

TENBURY ROAD

Fair

Over: LONG QUARTER BRANCH

100 FEET W OF MEADOWVALE, Baltimore, MD

Built 1955 Load: 24.9 t ADT: 553

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.