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)

OWINGS MILLS BOULE

Good

Over: HORSEHEAD BRANCH

2.7 MI SW OF MD 140, Baltimore, MD

Built 2012 Load: 34.0 t ADT: 41,030

HESS ROAD

Good

Over: LITTLE GUNPOWDER FALLS

1.8 MI E OLD YORK ROAD, Baltimore, MD

Built 1978 Load: 34.3 t ADT: 2,699

CROSBY ROAD

Good

Over: IS 695

0.6 MI S OF IS 70, Baltimore, MD

Built 2018 Load: 34.7 t ADT: 12,625

GREENSPRING AVENUE

Good

Over: SLAUGHTERHOUSE BRANCH

0.3 MI N BALTO BELTWAY, Baltimore, MD

Built 1984 Load: 34.9 t ADT: 5,193

IS 695

Good

Over: MILFORD MILL ROAD

0.74 MILE NORTH OF MD 26, Baltimore, MD

Built 2017 Load: 35.0 t ADT: 189,237

MD 43

Good

Over: BIRD RIVER ROAD

0.939 MILE EAST OF US 40, Baltimore, MD

Built 2005 Load: 35.4 t ADT: 13,012

I695E RAMP TO I95N

Good

Over: I95/ I695 (INTERCHANGE)

I695 I95 Interchange, Baltimore, MD

Built 2008 Load: 35.4 t ADT: 21,567

US 1

Good

Over: CSX TRANSPORTATION

0.78 MI N OF IS 895, Baltimore, MD

Built 2021 Load: 35.6 t ADT: 23,100

IS 695

Good

Over: BENSON AVENUE

0.18 MI S OF US 1, Baltimore, MD

Built 2004 Load: 35.6 t ADT: 177,072

DAIRY ROAD

Good

Over: TRIBUTARY TO OWL BRANCH

0.45 MI W OF IS 83, Baltimore, MD

Built 1963 Load: 35.8 t ADT: 350

JOPPA ROAD

Good

Over: I-95

Milepost M68.5, Baltimore, MD

Built 2005 Load: 35.8 t ADT: 3,799

LOCH RAVEN DRIVE

Good

Over: LOCH RAVEN RESERVOIR

0.9 MI N PROVIDENCE RD, Baltimore, MD

Built 1988 Load: 36.0 t ADT: 4,990

IS 695 RAMP 8

Good

Over: LEEDS AVE & HERBERT RUN

0.92 MI N OF I-95, Baltimore, MD

Built 2016 Load: 36.3 t ADT: 3,975

IS 795 RAMP 1

Good

Over: MD 940

0.68 MI S OF MD 940, Baltimore, MD

Built 1986 Load: 36.3 t ADT: 18,960

MD 43

Good

Over: WINDLASS RUN

1.587 MILE EAST OF US 40, Baltimore, MD

Built 2005 Load: 36.3 t ADT: 13,012

ENSOR ROAD

Good

Over: THIRD MINE BRANCH

1.85 MILES SW OF MD 439, Baltimore, MD

Built 2016 Load: 36.3 t ADT: 75

MARSHANE ROAD

Good

Over: TRIBUTARY TO NORRIS RUN

0.5 MI E OF NICODEMUS RD, Baltimore, MD

Built 2015 Load: 36.6 t ADT: 200

IS 695

Good

Over: EDMONDSON AVENUE

0.48 MILE NORTH OF MD 144, Baltimore, MD

Built 2021 Load: 36.9 t ADT: 180,306

MD 140

Good

Over: IS 695

0.6 M S OF MT WILSON LANE, Baltimore, MD

Built 2002 Load: 37.2 t ADT: 42,450

IS 795 NBR

Good

Over: COCKEYS MILL ROAD

0.65 MILE SOUTH OF MD 140, Baltimore, MD

Built 1985 Load: 37.2 t ADT: 55,810

IS 795 SBR

Good

Over: COCKEYS MILL ROAD

0.65 MILE SOUTH OF MD 140, Baltimore, MD

Built 1985 Load: 37.2 t ADT: 55,810

CAMPBELL BOULEVARD

Good

Over: TRIBUTARY TO WHITE MARSH

0.5 Miles East of US 40, Baltimore, MD

Built 2015 Load: 37.3 t ADT: 4,393

RAPHEL ROAD

Good

Over: I-95

Milepost M70.7, Baltimore, MD

Built 2023 Load: 37.3 t ADT: 5,392

MD 43

Good

Over: WHITE MARSH RUN

0.197 MILE EAST OF US 40, Baltimore, MD

Built 2004 Load: 37.6 t ADT: 13,012

PAINTERS MILL ROAD

Good

Over: GWYNN FALLS

0.5 MI SW REISTERSTOWN RD, Baltimore, MD

Built 1954 Load: 37.6 t ADT: 22,643

MD 150

Good

Over: MIDDLE RIVER

0.27 MI SW OF MD 700, Baltimore, MD

Built 1993 Load: 38.1 t ADT: 38,470

US 40

Good

Over: PATAPSCO RIVER

ON HOWARD CO LINE, Baltimore, MD

Built 1936 Load: 38.1 t ADT: 37,530

TRENTON ROAD

Good

Over: LITTLE PINEY RUN

0.4 MI. W DARK HOLLOW RD, Baltimore, MD

Built 2007 Load: 38.1 t ADT: 722

GWYNNBROOK AVENUE

Good

Over: TRIBUTARY TO GWYNNS FALL

0.09 MI E OWINGS MILLS BL, Baltimore, MD

Built 2018 Load: 38.5 t ADT: 4,304

I95 SOUTHBOUND

Good

Over: I695 STEMMERS RUN

2.8 Mile North of I-895, Baltimore, MD

Built 2008 Load: 38.5 t ADT: 55,243

RIVER ROAD

Good

Over: TRIBUTARY TO PATAPSCO RI

1.24 MILES S OF MD 144, Baltimore, MD

Built 2020 Load: 38.9 t ADT: 956

GLEN ARM ROAD

Good

Over: GUNPOWDER FALLS

0.02 MI E OF MD 567, Baltimore, MD

Built 1998 Load: 39.5 t ADT: 14,402

I695W RAMP TO I95S

Good

Over: I95/I695 (INTERCHANGE)

I-695/I-95 Interchange, Baltimore, MD

Built 2008 Load: 39.5 t ADT: 10,671

IS 83 SBR

Good

Over: NCR TRAIL & LITTLE FALLS

0.55 MILE SOUTH OF MD 45, Baltimore, MD

Built 2005 Load: 39.9 t ADT: 50,431

MD 695 OL

Good

Over: AMTRAK

1.12 MILE NORTH OF MD 702, Baltimore, MD

Built 1972 Load: 40.4 t ADT: 74,892

VERNON ROAD

Good

Over: SECOND MINE BRANCH

0.5 M NW WHITE HALL ROAD, Baltimore, MD

Built 2012 Load: 40.5 t ADT: 268

OWINGS MILLS BOULE

Good

Over: SCOTTS LEVEL BRANCH

2.5 MI. S. OF IS 795, Baltimore, MD

Built 2015 Load: 40.5 t ADT: 7,431

THORNTON MILL ROAD

Good

Over: TRIBUTARY TO WESTERN RUN

0.4 MI S OF QUAKER BOTTOM, Baltimore, MD

Built 2010 Load: 40.8 t ADT: 300

PINEY HILL ROAD

Good

Over: TRIBUTARY TO GUNPOWDER F

0.4 MI S OF MONKTON ROAD, Baltimore, MD

Built 2003 Load: 40.8 t ADT: 244

I-95 NORTHBOUND

Good

Over: I-695 STEMMERS RUN

I695 IS95 Interchange, Baltimore, MD

Built 2008 Load: 40.8 t ADT: 52,628

MD 43 EB

Good

Over: I-95

I-95 Mile Marker 66.8, Baltimore, MD

Built 2014 Load: 40.8 t ADT: 6,068

MARSHANE ROAD

Good

Over: TRIBUTARY TO NORRIS RUN

0.35 MI E OF NICODEMUS RD, Baltimore, MD

Built 2015 Load: 41.1 t ADT: 200

US 1

Good

Over: MD 43

0.85 MILE EAST OF IS 695, Baltimore, MD

Built 1993 Load: 41.3 t ADT: 35,092

MILFORD MILL ROAD

Good

Over: MTA CSX RAILROAD

0.4 MI W OF MD RTE 140, Baltimore, MD

Built 1984 Load: 41.3 t ADT: 17,445

I95S TO I695E

Good

Over: I95/I695 INTERCHANGE

I-95/I-695 Interchange, Baltimore, MD

Built 2008 Load: 41.3 t ADT: 14,826

GORE MILL ROAD

Good

Over: LITTLE FALLS

1.2 MI N MIDDLETOWN RD, Baltimore, MD

Built 2018 Load: 41.5 t ADT: 172

MD 45

Good

Over: BEAVERDAM RUN

0.11 M N OF RAILROAD AVE, Baltimore, MD

Built 1990 Load: 41.7 t ADT: 30,482

MD 129

Good

Over: IS 695

0.05 MI N OF MD 129A, Baltimore, MD

Built 1961 Load: 41.7 t ADT: 20,000

MD 695 RAMP 7A

Good

Over: NORTHEAST CREEK

@ MD 695 & MD 702, Baltimore, MD

Built 1972 Load: 41.7 t ADT: 7,951

OWINGS MILLS BOULE

Good

Over: RED RUN

1 MI SOUTH OF IS 795, Baltimore, MD

Built 1990 Load: 41.7 t ADT: 36,114

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.