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)

BEAVERDAM ROAD

Fair

Over: IS 83

AT IS 83, Baltimore, MD

Built 1973 Load: 45.4 t ADT: 5,584

IS 695 IL

Fair

Over: EDMONDSON AVENUE

0.48 MILE NORTH OF MD 144, Baltimore, MD

Built 1957 Load: 45.4 t ADT: 180,306

IS 695

Fair

Over: US 40

1.23 MILE NORTH OF MD 144, Baltimore, MD

Built 1958 Load: 45.4 t ADT: 188,860

IS 70 EBR

Fair

Over: RAMPS C & G

0.54 M E OF ROLLING ROAD, Baltimore, MD

Built 1966 Load: 45.4 t ADT: 25,300

IS 70 WBR

Fair

Over: RAMPS C & G

0.54 M E OF ROLLING ROAD, Baltimore, MD

Built 1966 Load: 45.4 t ADT: 25,300

IS 95 SBR

Fair

Over: IS 695

0.85 MILE NORTH OF US 1, Baltimore, MD

Built 1969 Load: 45.4 t ADT: 91,742

IS 695 RAMP B

Fair

Over: IS 83 RAMP C

0.40 MI S OF MD 139, Baltimore, MD

Built 1973 Load: 45.4 t ADT: 11,150

SHELBOURNE ROAD

Fair

Over: WEST BRANCH HERBERT RUN

0.5 MI N SULPHUR SPRING R, Baltimore, MD

Built 1920 Load: 45.4 t ADT: 3,710

MD 25

Fair

Over: BLACKROCK RUN

1.46 MILE SOUTH OF MD 137, Baltimore, MD

Built 1995 Load: 45.8 t ADT: 3,551

IS 695

Fair

Over: GREENSPRING AVENUE

1.37 MILE SOUTH OF MD 25, Baltimore, MD

Built 1961 Load: 45.8 t ADT: 176,700

MASEMORE ROAD

Fair

Over: BUSH CABIN RUN

1.4 MI N OF MT CARMEL RD, Baltimore, MD

Built 1910 Load: 45.8 t ADT: 275

I-895 NB

Fair

Over: TRANSWAY ROAD

I-895 NB Milepost 3.28, Baltimore, MD

Built 1957 Load: 45.8 t ADT: 7,507

I-895 SB

Fair

Over: TRANSWAY ROAD

I-895 SB Milepost 3.28, Baltimore, MD

Built 1957 Load: 45.8 t ADT: 8,846

US 40

Fair

Over: WHITEMARSH RUN

0.67 MILE WEST OF MD 43, Baltimore, MD

Built 1935 Load: 46.3 t ADT: 29,100

IS 83

Fair

Over: BUFFALO CREEK

2.80 MI S OF MD 137, Baltimore, MD

Built 1955 Load: 46.3 t ADT: 64,381

IS 695 RAMP E

Fair

Over: MD 122 RAMP M

0.39 MI N OF IS 70, Baltimore, MD

Built 1965 Load: 46.3 t ADT: 38,070

MD 7

Fair

Over: MD 695

0.27 MILE NORTH OF MD 588, Baltimore, MD

Built 1958 Load: 46.3 t ADT: 35,080

IS 795

Fair

Over: IS 795 RAMP 1

@ MD 140, Baltimore, MD

Built 1985 Load: 46.3 t ADT: 55,810

IS 195 EBR

Fair

Over: IS 895

0.38 MI N OF AA CO LINE, Baltimore, MD

Built 1987 Load: 46.3 t ADT: 39,015

GLEN ARM ROAD

Fair

Over: HAYSTACK BRANCH

0.6 MI W OF HARFORD RD, Baltimore, MD

Built 1976 Load: 46.3 t ADT: 7,740

IS 695

Fair

Over: JOPPA ROAD

0.34 MILE SOUTH OF MD 41, Baltimore, MD

Built 1961 Load: 46.7 t ADT: 144,880

MD 940

Fair

Over: CSX TRANS & GWYNNS FALLS

0.08 MILE SOUTH OF MD 140, Baltimore, MD

Built 1985 Load: 46.7 t ADT: 45,921

MERRITT BOULEVARD

Fair

Over: BREAD AND CHEESE CREEK

0.31 MI S. OF MD 208, Baltimore, MD

Built 1958 Load: 46.7 t ADT: 45,947

I-895 NB

Fair

Over: HERBERT RUN

I-895 Milepost 2.0, Baltimore, MD

Built 1957 Load: 47.2 t ADT: 7,507

I-895 SB

Fair

Over: HERBERT RUN

Milepost M2.0, Baltimore, MD

Built 1957 Load: 47.2 t ADT: 8,846

MD 295 SB

Fair

Over: I-895

I-895 Milepost 4.5, Baltimore, MD

Built 1957 Load: 47.2 t ADT: 53,767

MD 88

Fair

Over: INDIAN RUN

0.05 MILE WEST OF MD 25, Baltimore, MD

Built 1930 Load: 47.6 t ADT: 4,651

IS 83 NBR

Fair

Over: MD 25 JONES FALLS

0.03 MI S OF MD 25, Baltimore, MD

Built 1962 Load: 47.6 t ADT: 96,870

IS 83 SBR

Fair

Over: MD 25 JONES FALLS

0.03 MI S OF MD 25, Baltimore, MD

Built 1962 Load: 47.6 t ADT: 96,870

MD 130

Fair

Over: NORTH BRANCH

1.50 MILE EAST OF MD 129, Baltimore, MD

Built 1900 Load: 47.6 t ADT: 5,500

IS 195 WBR

Fair

Over: IS 895

0.38 MI N OF AA CO LINE, Baltimore, MD

Built 1987 Load: 47.6 t ADT: 39,015

WISEBURG ROAD

Fair

Over: SECOND MINE BRANCH

100 FT NW WHITEHALL RD, Baltimore, MD

Built 1926 Load: 47.6 t ADT: 2,118

FALLS ROAD

Fair

Over: GUNPOWDER FALLS

1.1 MI S MIDDLETOWN RD, Baltimore, MD

Built 1884 Load: 47.6 t ADT: 300

I-895 NBR

Fair

Over: CALVERT ACCESS ROAD S

Milepost M1.8, Baltimore, MD

Built 1957 Load: 47.6 t ADT: 7,507

I- 895 SBR

Fair

Over: CALVERT ACCESS ROAD S

Milepost M1.8, Baltimore, MD

Built 1957 Load: 47.6 t ADT: 8,846

MD 295 NB

Fair

Over: I-895

I-895 Milepost 4.5, Baltimore, MD

Built 1957 Load: 47.6 t ADT: 48,605

IS 695 RAMP 1

Fair

Over: WHITEMARSH BRANCH

0.04 MI N OF MD 147, Baltimore, MD

Built 1961 Load: 48.1 t ADT: 3,892

ENSOR MILL ROAD

Fair

Over: PINEY CREEK

0.5 MI N OF BELFAST ROAD, Baltimore, MD

Built 1978 Load: 48.1 t ADT: 1,356

JOPPA ROAD

Fair

Over: MTA LIGHT RAIL

50 FT W BELLONA AVE, Baltimore, MD

Built 1986 Load: 48.1 t ADT: 21,549

TRENTON ROAD

Fair

Over: PINEY RUN

0.8 MI SW OF BLACKROCK RD, Baltimore, MD

Built 1970 Load: 48.1 t ADT: 1,050

IS 83 SBR

Fair

Over: Bunker Hill Road

1.08 MI N OF MD 137, Baltimore, MD

Built 1955 Load: 48.5 t ADT: 59,820

OLD COURT ROAD

Fair

Over: IS 695

0.38 MI S OF IS 795, Baltimore, MD

Built 1983 Load: 48.5 t ADT: 15,090

MD 151 EBR

Fair

Over: MERRITT BOULEVARD

0.21 MI N OF MD 695, Baltimore, MD

Built 1968 Load: 48.5 t ADT: 30,031

COVE ROAD

Fair

Over: NORFOLK SOUTHERN RR

500 N. OF MD 695, Baltimore, MD

Built 1971 Load: 48.5 t ADT: 5,699

MCDONOGH ROAD

Fair

Over: SCOTTS LEVEL BRANCH

0.5 MI N OF MD RTE 26, Baltimore, MD

Built 1993 Load: 48.5 t ADT: 4,750

CHESACO AVENUE

Fair

Over: I-95

Milepost M61.7, Baltimore, MD

Built 1996 Load: 48.5 t ADT: 12,525

IS 83 NBR

Fair

Over: THORNTON MILL ROAD

0.9 M S OF BR NO 0305500, Baltimore, MD

Built 1953 Load: 49.0 t ADT: 60,263

IS 70 RAMP H

Fair

Over: IS 695 RAMP J

0.39 MI N OF IS 70, Baltimore, MD

Built 1965 Load: 49.0 t ADT: 39,171

IS 95 NBR

Fair

Over: CARVILLE & OREGON AVENUE

0.14 MILE SOUTH OF US 1, Baltimore, MD

Built 1970 Load: 49.0 t ADT: 176,796

IS 795 & RAMP 4

Fair

Over: IS 795 RAMP 10

0.62 MILE SOUTH OF MD 940, Baltimore, MD

Built 1983 Load: 49.0 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.