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

Good-condition bridges (234)

SOUTH DOLFIELD ROA

Good

Over: GWYNNS FALLS

0.3 M NW PAINTERS MILL RD, Baltimore, MD

Built 1965 Load: 56.2 t ADT: 8,948

I-95 NB

Good

Over: CAMPBELL ROAD

0.66 MI S OF MD RTE 43, Baltimore, MD

Built 1962 Load: 56.2 t ADT: 98,960

PROVIDENCE ROAD

Good

Over: IS 695

1.26 MI N OF MD 146, Baltimore, MD

Built 2001 Load: 56.7 t ADT: 10,140

US 1

Good

Over: LITTLE GUNPOWDER FALLS

ON HARFORD CO LINE, Baltimore, MD

Built 2010 Load: 57.1 t ADT: 22,152

MD 702

Good

Over: DEEP CREEK

0.68 MILE EAST OF MD 150, Baltimore, MD

Built 1989 Load: 57.1 t ADT: 27,871

IS 83 NBR

Good

Over: NCR TRAIL & LITTLE FALLS

0.55 MILE SOUTH OF MD 45, Baltimore, MD

Built 2006 Load: 57.6 t ADT: 50,431

MOUNT VISTA ROAD

Good

Over: BROAD RUN

0.35 MI E OF US ROUTE 1, Baltimore, MD

Built 1998 Load: 57.6 t ADT: 1,034

WHITE MARSH ROAD

Good

Over: TRIBUTARY TO WHITE MARSH

1.0 MI E OF MD RT 1, Baltimore, MD

Built 2005 Load: 58.0 t ADT: 3,320

I695W RAMP TO I95N

Good

Over: STEMMERS RUN

I95/I695 INTERCHANGE, Baltimore, MD

Built 2008 Load: 58.0 t ADT: 13,836

MD 140 SBR

Good

Over: IS 795 RAMPS 1 & 6

0.17 MILE NORTH OF MD 795, Baltimore, MD

Built 1985 Load: 59.4 t ADT: 18,840

RESH MILL ROAD

Good

Over: GRAVE RUN

0.56 MI N OF FALLS RD, Baltimore, MD

Built 2005 Load: 59.4 t ADT: 232

DOGWOOD ROAD

Good

Over: DOGWOOD RUN

2.74 MI. W. OF IS 695, Baltimore, MD

Built 2018 Load: 59.9 t ADT: 7,043

IS 695

Good

Over: SECURITY BOULEVARD

0.46 MILE NORTH OF IS 70, Baltimore, MD

Built 1961 Load: 60.3 t ADT: 203,902

IS 83/IS 695

Good

Over: MD 25A

0.36 MILE NORTH OF MD 25, Baltimore, MD

Built 2005 Load: 60.8 t ADT: 176,700

GWYNNBROOK AVENUE

Good

Over: GWYNNS FALLS

1.04 MILES E OF MD 140, Baltimore, MD

Built 1992 Load: 61.2 t ADT: 9,800

GREENSPRING AVENUE

Good

Over: MOORES BRANCH

0.65 MI S OF MD 133, Baltimore, MD

Built 1965 Load: 61.2 t ADT: 8,341

I95 NORTHBOUND

Good

Over: FUTURE RAMP MB

I695 IS95 Interchange, Baltimore, MD

Built 2008 Load: 61.2 t ADT: 52,628

LILLIAN HOLT DRIVE

Good

Over: IS 695

0.62 MILE NORTH OF MD 588, Baltimore, MD

Built 2008 Load: 61.7 t ADT: 13,000

MD 151 (SPARROWS P

Good

Over: MD 151B AND TRADEPOINT R

0.1 MI S. OF MD 158, Baltimore, MD

Built 1954 Load: 61.9 t ADT: 21,000

HARRIS MILL ROAD

Good

Over: DEER CREEK

0.59 MI E OF MASON-DIX RD, Baltimore, MD

Built 2006 Load: 62.1 t ADT: 298

BUSINESS PARK DRIV

Good

Over: TRIBUTARY TO ROLAND RUN

0.4 MI S OF TIMONIUM RD, Baltimore, MD

Built 1992 Load: 62.1 t ADT: 5,516

DAIRY ROAD

Good

Over: OWL BRANCH

1MI S. OF I-83 EXIT33, Baltimore, MD

Built 2011 Load: 62.6 t ADT: 727

IS 795 RAMP 9

Good

Over: MD 940 RAMP 7

@ IS 795 & MD 940, Baltimore, MD

Built 1985 Load: 63.9 t ADT: 2,633

FREELAND ROAD

Good

Over: IS 83

0.13 MI E OF MD 45, Baltimore, MD

Built 2007 Load: 64.4 t ADT: 1,024

PHOENIX ROAD

Good

Over: TRIBUTARY TO GUNPOWDER F

0.5 MI. NE OF SR 45, Baltimore, MD

Built 2002 Load: 64.4 t ADT: 1,607

IS 795 RAMP 1

Good

Over: IS 795 RAMP 7 & 9

@ MD 940, Baltimore, MD

Built 1985 Load: 64.9 t ADT: 18,960

I-695 RAMP to I95S

Good

Over: STEMMERS RUN

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

Built 2008 Load: 64.9 t ADT: 23,331

JOPPA ROAD

Good

Over: IS 83/IS 695 & RAMP 7

0.54 MILE EAST OF MD 25, Baltimore, MD

Built 2005 Load: 65.3 t ADT: 7,031

IS 83 RAMP 6

Good

Over: BRANCH OF BEAVERDAM RUN

RP FR PADONIA TO I 83 SB, Baltimore, MD

Built 1983 Load: 65.3 t ADT: 10,000

BUSINESS PARK DRIV

Good

Over: ROLAND RUN

0.4 MI S OF TIMONIUM RD, Baltimore, MD

Built 1992 Load: 66.2 t ADT: 5,625

WESTLAND BLVD

Good

Over: IS 695

AT IS 695, Baltimore, MD

Built 2003 Load: 67.1 t ADT: 1,155

MD 151B (Wharf Roa

Good

Over: Warehouse Road and Trade

0.4 Mi. S. of MD 158, Baltimore, MD

Built 2022 Load: 67.4 t ADT: 12,750

MD 146

Good

Over: IS 695

0.78 MI N OF MD 45, Baltimore, MD

Built 2001 Load: 67.6 t ADT: 24,902

GUN ROAD

Good

Over: PATAPSCO RIVER

PATAPSCO VALLEY ST PARK, Baltimore, MD

Built 1975 Load: 67.6 t ADT: 110

MD 25

Good

Over: GEORGES RUN

1.36 MI N OF MD 137, Baltimore, MD

Built 2015 Load: 67.7 t ADT: 4,400

CROMWELL VALLEY PA

Good

Over: MINEBANK RUN

0.3 MI. NW CROMWELL BR RD, Baltimore, MD

Built 2005 Load: 68.5 t ADT: 212

BENSON MILL ROAD

Good

Over: BLACKROCK RUN

0.3 MI E OF MD 25, Baltimore, MD

Built 2001 Load: 68.9 t ADT: 4,229

OWINGS MILLS BOULE

Good

Over: TRIBUTARY TO GWYNNS FALL

0.06 MI S OF GWYNBRK AVE, Baltimore, MD

Built 2003 Load: 68.9 t ADT: 29,024

MD-43

Good

Over: I-95 Ramps E & F

3.2 MI N OF I-695/I-95INT, Baltimore, MD

Built 2012 Load: 68.9 t ADT: 31,500

EARLS ROAD

Good

Over: AMTRAK RAILROAD

0.16 MI N OF MD RTE 150, Baltimore, MD

Built 2000 Load: 69.4 t ADT: 4,370

IS 795 SBR

Good

Over: MD 940 RAMP 7

0.13 MILE NORTH OF MD 940, Baltimore, MD

Built 1985 Load: 69.8 t ADT: 68,761

HARRIS MILL ROAD

Good

Over: EBAUGHS CREEK

0.15 MI N OF BOND ROAD, Baltimore, MD

Built 2011 Load: 69.8 t ADT: 370

IS 83 NBR

Good

Over: QUAKER BOTTOM ROAD

0.9 M N OF BR NO 0305600, Baltimore, MD

Built 1999 Load: 70.7 t ADT: 33,380

IS 695 OL RAMP 1

Good

Over: LEEDS AVE & HERBERT RUN

0.77 MILE NORTH OF IS 95, Baltimore, MD

Built 2004 Load: 71.2 t ADT: 5,696

US 1

Good

Over: IS 695

3.0 MI N OF IS 95, Baltimore, MD

Built 1995 Load: 71.7 t ADT: 46,322

IS 83 RAMP 7

Good

Over: IS 83

0.83 MI S OF BEAVERDAM RD, Baltimore, MD

Built 1991 Load: 73.0 t ADT: 15,300

IS 83 SB RAMP 7

Good

Over: MD 25A

0.36 MI N OF MD 25, Baltimore, MD

Built 2005 Load: 73.9 t ADT: 32,550

US 40 EBR

Good

Over: LITTLE GUNPOWDER FALLS

ON HARFORD CO LINE, Baltimore, MD

Built 1935 Load: 74.2 t ADT: 14,805

US 40 WBR

Good

Over: LITTLE GUNPOWDER FALLS

ON HARFORD CO LINE, Baltimore, MD

Built 1935 Load: 74.2 t ADT: 14,805

MD 439

Good

Over: IS 83

0.25 MI E OF MD 45, Baltimore, MD

Built 2002 Load: 74.4 t ADT: 7,650

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.