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)

RIDGEFIELD ROAD

Fair

Over: LONG QUARTER BRANCH

0.30 MI E OF MD 45, Baltimore, MD

Built 1955 Load: 24.9 t ADT: 715

CAVES ROAD

Fair

Over: NORTH BRANCH JONES FALLS

0.12 MI SW OF MD 129, Baltimore, MD

Built 1910 Load: 24.9 t ADT: 3,208

WISE AVENUE

Fair

Over: BEAR CREEK

0.9 MI W OF NORTH PT RD, Baltimore, MD

Built 1948 Load: 25.4 t ADT: 14,960

DUTTON AVENUE AND

Fair

Over: TRIBUTARY TO PATAPSCO RI

200 S. OF EDMONDSON AVE., Baltimore, MD

Built 1979 Load: 25.4 t ADT: 6,048

LINDEN AVENUE

Fair

Over: EAST BRANCH HERBERT RUN

0.06 MI S OF EAST DR, Baltimore, MD

Built 1982 Load: 25.8 t ADT: 4,590

DULANEY VALLEY ROA

Fair

Over: DULANEY BRANCH

0.3 MI N MD RTE 542, Baltimore, MD

Built 1952 Load: 25.8 t ADT: 6,872

AVONDALE ROAD

Fair

Over: WHITE MARSH RUN

0.02 M N OF I 695, Baltimore, MD

Built 1971 Load: 25.8 t ADT: 4,232

GREEN ROAD

Fair

Over: LITTLE GUNPOWDER FALLS

1.0 MI N SWEET AIR RD, Baltimore, MD

Built 1990 Load: 26.3 t ADT: 603

HICKS ROAD

Fair

Over: LITTLE FALLS

1 MI SE OF BIG FALLS RD, Baltimore, MD

Built 1988 Load: 26.3 t ADT: 3,000

WESTERN RUN ROAD

Fair

Over: WESTERN RUN

1.3 MI N OF SHAWAN RD, Baltimore, MD

Built 1988 Load: 26.3 t ADT: 2,299

FREELAND ROAD

Fair

Over: LITTLE FALLS

1.3 MI NW OF MIDDLETOWN R, Baltimore, MD

Built 1986 Load: 26.3 t ADT: 1,699

HARTLEY MILL ROAD

Fair

Over: LONG GREEN CREEK

0.2 MI SE OF GLEN ARM RD, Baltimore, MD

Built 1988 Load: 26.3 t ADT: 1,841

BENTLEY ROAD

Fair

Over: BEETREE RUN

200 FEET N OF EAGLE MILL, Baltimore, MD

Built 1988 Load: 26.3 t ADT: 300

TAYLOR AVENUE

Fair

Over: TRIBUTARY TO HERRING RUN

0.14 MI SE OF MD 41, Baltimore, MD

Built 1969 Load: 26.8 t ADT: 14,881

US 1

Fair

Over: HERBERT RUN

0.49 MI S OF MD 644A, Baltimore, MD

Built 1949 Load: 27.2 t ADT: 11,542

IS 95 SBR

Fair

Over: CSX PATAPSCO RIVER CO

ON HOWARD CO LINE, Baltimore, MD

Built 1968 Load: 27.2 t ADT: 172,509

OAKLEIGH ROAD

Fair

Over: HERRING RUN

0.2 MI S OF PERRING PKWY, Baltimore, MD

Built 1953 Load: 27.2 t ADT: 7,961

HYDES ROAD

Fair

Over: LONG GREEN CREEK

0.5 M W OF LONG GREEN PKE, Baltimore, MD

Built 1952 Load: 27.2 t ADT: 5,400

LITTLE CREEK DRIVE

Fair

Over: DEAD RUN

250 FT W DOGWOOD RD, Baltimore, MD

Built 1952 Load: 27.2 t ADT: 773

BECKLEYSVILLE ROAD

Fair

Over: PRETTYBOY RESERVOIR

3 MI W MIDDLETOWN RD, Baltimore, MD

Built 1931 Load: 27.2 t ADT: 1,100

I-695 IL

Fair

Over: BEAR CREEK

MILEPOST M46.2, Baltimore, MD

Built 1975 Load: 27.5 t ADT: 14,819

MD 151 WBR

Fair

Over: MERRITT BOULEVARD

0.21 MI N OF MD 695, Baltimore, MD

Built 1968 Load: 27.7 t ADT: 30,031

POT SPRING ROAD

Fair

Over: SPRING BRANCH

0.5 MI S OF TIMONIUM RD, Baltimore, MD

Built 1973 Load: 27.7 t ADT: 13,676

WOODLAWN DRIVE

Fair

Over: TRIBUTARY TO GWYNNS FALL

.09 MI N WINDSOR MILL, Baltimore, MD

Built 1963 Load: 28.1 t ADT: 15,620

MD 695 IL

Fair

Over: MD 151 NBR

0.62 MILE NORTH OF MD 150, Baltimore, MD

Built 1967 Load: 28.6 t ADT: 41,012

MD 695 OL

Fair

Over: MD 151 NBR

0.62 MILE NORTH OF MD 150, Baltimore, MD

Built 1967 Load: 28.6 t ADT: 41,012

DIAMOND POINT ROAD

Fair

Over: MD 695

0.47 MI W OF MD 150, Baltimore, MD

Built 1970 Load: 28.6 t ADT: 999

PLEASANTVILLE ROAD

Fair

Over: LITTLE GUNPOWDER FALLS

1.0 MI NE LONG GREEN PIKE, Baltimore, MD

Built 1987 Load: 28.6 t ADT: 4,715

BOND ROAD

Fair

Over: DEER CREEK

200 FT W OF WEST LIBERTY, Baltimore, MD

Built 1988 Load: 28.6 t ADT: 812

CIRCLE ROAD

Fair

Over: ROLAND RUN

100 FT WEST OF RUXTON RD, Baltimore, MD

Built 1988 Load: 28.6 t ADT: 1,255

PLEASANT GROVE ROA

Fair

Over: MCGILL RUN

0.3 MI S OF DOVER RD, Baltimore, MD

Built 1920 Load: 28.6 t ADT: 510

LHIRONDELLE CLUB

Fair

Over: ROLAND RUN

2.77 MI S OF RUXTON RD, Baltimore, MD

Built 1992 Load: 28.6 t ADT: 104

TWILIGHT COURT

Fair

Over: REDHOUSE CREEK

0.2 MILES WEST OF IS 95, Baltimore, MD

Built 1990 Load: 28.6 t ADT: 227

CHESACO AVENUE

Fair

Over: CSX RAILROAD

0.2 MI S US RTE 40, Baltimore, MD

Built 1957 Load: 29.0 t ADT: 3,260

BIRMINGHAM AVENUE

Fair

Over: TRIBUTARY TO HERRING RUN

0.10 MI N. OF TAYLOR AVE., Baltimore, MD

Built 1954 Load: 29.0 t ADT: 630

MD 695 OL

Fair

Over: NORFOLK SOUTHERN RR

0.18 MILE SOUTH OF MD 151, Baltimore, MD

Built 1966 Load: 29.5 t ADT: 41,012

MD 695 OL

Fair

Over: MD 150

0.62 MILE SOUTH OF MD 151, Baltimore, MD

Built 1965 Load: 29.5 t ADT: 41,012

SELFORD ROAD

Fair

Over: MD 166

0.08 MI N OF IS 195, Baltimore, MD

Built 1975 Load: 29.5 t ADT: 4,011

I-895 NB

Fair

Over: I-695

I-895 NB Milepost 3.5, Baltimore, MD

Built 1957 Load: 29.5 t ADT: 9,352

IS 70 EBR

Fair

Over: PATAPSCO RIVER CSX TRAN

ON HOWARD CO LINE, Baltimore, MD

Built 1965 Load: 29.9 t ADT: 89,503

IS 70 WBR

Fair

Over: PATAPSCO RIVER CSX TRAN

ON HOWARD CO LINE, Baltimore, MD

Built 1965 Load: 29.9 t ADT: 89,503

WENDOVER AVENUE

Fair

Over: TRIBUTARY TO HERRING RUN

0.2 MI N OF TAYLOR AVE, Baltimore, MD

Built 1968 Load: 29.9 t ADT: 400

SHEPHERD AVENUE

Fair

Over: TRIBUTARY TO HERRING RUN

0.02 MI N OF TAYLOR AVE, Baltimore, MD

Built 1969 Load: 29.9 t ADT: 439

MD 157 (PENINSULA

Fair

Over: BEAR CREEK

1.39 MILE NORTH OF MD 158, Baltimore, MD

Built 1960 Load: 30.4 t ADT: 9,414

NORTH FOREST PARK

Fair

Over: DOGWOOD ROAD AND DEAD RU

300 FT E OF SECURITY BLVD, Baltimore, MD

Built 1963 Load: 30.4 t ADT: 23,080

DOGWOOD ROAD

Fair

Over: BRICE RUN

0.92 MI S OF MD 125, Baltimore, MD

Built 1930 Load: 30.4 t ADT: 1,300

MD 695 IL

Fair

Over: MD 150

0.62 MILE SOUTH OF MD 151, Baltimore, MD

Built 1965 Load: 30.8 t ADT: 41,012

OFFUTT ROAD

Fair

Over: SCOTTS LEVEL BRANCH

0.09 MI N OF ZETA WAY, Baltimore, MD

Built 1968 Load: 30.8 t ADT: 9,455

MD 25

Fair

Over: JONES FALLS

0.20 MILE SOUTH OF IS 83, Baltimore, MD

Built 1930 Load: 31.3 t ADT: 10,911

MD 702 EBR

Fair

Over: NORTHEAST CREEK

0.10 MILE WEST OF MD 695, Baltimore, MD

Built 1972 Load: 31.3 t ADT: 18,645

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.