Total bridges
783
Public highway bridges in Baltimore County
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.
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
- pre-1900 9
Built before 1900
9 bridges
- 1900s 7
1900–1909
7 bridges
- 1910s 12
1910–1919
12 bridges
- 1920s 37
1920–1929
37 bridges
- 1930s 33
1930–1939
33 bridges
- 1940s 22
1940–1949
22 bridges
- 1950s
1950–1959
95 bridges
- 1960s
1960–1969
152 bridges
- 1970s
1970–1979
118 bridges
- 1980s
1980–1989
114 bridges
- 1990s
1990–1999
67 bridges
- 2000s
2000–2009
66 bridges
- 2010s 42
2010–2019
42 bridges
- 2020s 9
2020–2029
9 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).
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.
| County | Bridges | Good | Fair | Poor | Avg. built |
|---|---|---|---|---|---|
| Baltimore County (this page) | 783 | 29.9% | 66.9% | 3.2% | 1971 |
| Prince George's County | 576 | 36.6% | 60.2% | 3.1% | 1976 |
| Montgomery County | 515 | 38.8% | 56.3% | 4.9% | 1978 |
| Frederick County | 486 | 43.2% | 54.1% | 2.7% | 1971 |
| Anne Arundel County | 389 | 32.6% | 65.8% | 1.5% | 1980 |
| Baltimore city County | 374 | 16% | 75.4% | 8.6% | 1964 |
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).
- Hamilton County, OH · 783 bridges
- El Paso County, TX · 783 bridges
- Johnson County, KS · 781 bridges
- Fulton County, GA · 775 bridges
Similar average build year
Nearest mean year-built outside MD (1971 here).
- Wayne County, MI · avg 1971 · 1,026 bridges
- Washington County, PA · avg 1971 · 655 bridges
- Linn County, OR · avg 1971 · 566 bridges
- Monmouth County, NJ · avg 1971 · 505 bridges
Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.
Fair-condition bridges (524)
THORNTON ROAD
FairOver: TRIBUTARY TO ROLAND RUN
0.6 MI N OF JOPPA RD, Baltimore, MD
Built 1923 Load: 31.3 t ADT: 8,249
HUNTER MILL ROAD
FairOver: TRIBUTARY TO FIRST MINE
100 FT W OF VERNON ROAD, Baltimore, MD
Built 1988 Load: 31.3 t ADT: 325
STRINGTOWN ROAD
FairOver: BLACKROCK RUN
0.2 MI E OF FALLS RD, Baltimore, MD
Built 1931 Load: 31.3 t ADT: 332
US 1 ALT
FairOver: US1 NBR AMTRAK HERBERT
1.40 MI S OF IS 695, Baltimore, MD
Built 1936 Load: 31.7 t ADT: 18,083
MD 26
FairOver: BRANCH OF GWYNNS FALLS
0.48 MILE EAST OF IS 695, Baltimore, MD
Built 1965 Load: 31.7 t ADT: 46,342
LONG GREEN ROAD
FairOver: LONG GREEN CREEK
100 FT W LONG GREEN PIKE, Baltimore, MD
Built 1970 Load: 31.7 t ADT: 1,621
JOPPA ROAD
FairOver: ROLAND RUN
0.2 MI W OF BELLONA AVE, Baltimore, MD
Built 1970 Load: 31.7 t ADT: 5,886
STEVENSON ROAD
FairOver: IS 695
0.50 MI N OF MD 129, Baltimore, MD
Built 1961 Load: 32.2 t ADT: 8,404
IS 695 RAMP C
FairOver: IS 95 RAMP G
0.92 MI N OF US 1, Baltimore, MD
Built 1969 Load: 32.2 t ADT: 25,791
IS 95 NBR
FairOver: IS 695 RAMPS 3 & 5
0.75 MILE NORTH OF US 1, Baltimore, MD
Built 1969 Load: 32.2 t ADT: 184,000
TAYLOR AVENUE
FairOver: TRIB TO HERRING RUN
.03 MI. W. OF MD 41, Baltimore, MD
Built 1963 Load: 32.2 t ADT: 6,328
STABLERSVILLE ROAD
FairOver: FOURTH MINE BRANCH
0.2 MI E OF YORK RD, Baltimore, MD
Built 1950 Load: 32.2 t ADT: 600
GWYNNDALE AVENUE
FairOver: POWDER MILL BRANCH
0.12 MI N OF MD 126, Baltimore, MD
Built 1956 Load: 32.2 t ADT: 5,903
US 1
FairOver: STEMMERS RUN
0.23 MILE SOUTH OF IS 695, Baltimore, MD
Built 1960 Load: 32.7 t ADT: 39,242
MD 7 AND SPURS
FairOver: STEMMERS RUN
0.38 MI E OF MD 695, Baltimore, MD
Built 1973 Load: 32.7 t ADT: 39,620
MD 26
FairOver: GWYNNS FALLS
0.08 MI E OF ST LUKES LA, Baltimore, MD
Built 1965 Load: 32.7 t ADT: 34,042
MD 45
FairOver: GUNPOWDER FALLS
1.75 MILE NORTH OF MD 137, Baltimore, MD
Built 1924 Load: 32.7 t ADT: 5,350
IS 83
FairOver: BEAVERDAM RUN
0.31 MI N OF WARREN RD, Baltimore, MD
Built 1949 Load: 32.7 t ADT: 85,051
MD 125
FairOver: BRICE RUN
0.22 MI W OF OLD COURT RD, Baltimore, MD
Built 1930 Load: 32.7 t ADT: 5,551
GWYNN OAK AVENUE
FairOver: GWYNNS FALLS
0.29 MI W OF BALT CITY, Baltimore, MD
Built 1900 Load: 32.7 t ADT: 20,280
MD 144
FairOver: PATAPSCO RIVER
ON HOWARD CO LINE, Baltimore, MD
Built 1914 Load: 32.7 t ADT: 10,511
MD 147
FairOver: HAYSTACK BRANCH
1.01 MI S OF MT VISTA RD, Baltimore, MD
Built 1915 Load: 32.7 t ADT: 5,752
YORK ROAD
FairOver: LITTLE FALLS
0.07 MI S OF MD 45, Baltimore, MD
Built 1809 Load: 32.7 t ADT: 499
MD 746A
FairOver: JONES FALLS
0.09 MILE NORTH OF MD 25, Baltimore, MD
Built 1992 Load: 32.7 t ADT: 220
WINDSOR MILL ROAD
FairOver: IS 695
1.11 MI S OF MD 26, Baltimore, MD
Built 1961 Load: 32.7 t ADT: 19,171
IS 95 NBR
FairOver: CSX PATAPSCO RIVER CO
ON HOWARD CO LINE, Baltimore, MD
Built 1968 Load: 32.7 t ADT: 172,509
MD 122
FairOver: BRANCH OF DEAD RUN
0.55 MILE EAST OF IS 695, Baltimore, MD
Built 1961 Load: 32.7 t ADT: 34,910
DARK HOLLOW ROAD
FairOver: LITTLE PINEY RUN
1.2 MI N OF DOVER ROAD, Baltimore, MD
Built 1925 Load: 32.7 t ADT: 382
RIDGE ROAD
FairOver: BENS RUN
0.2 MI S OF KRATZ LA, Baltimore, MD
Built 1920 Load: 32.7 t ADT: 3,923
BELMONT AVENUE
FairOver: DELAWARE RUN
0.59 MI S OF MD 128, Baltimore, MD
Built 1940 Load: 32.7 t ADT: 900
HUTCHINS MILL ROAD
FairOver: NELSON BRANCH
0.41 MI N OF HESS RD, Baltimore, MD
Built 1920 Load: 32.7 t ADT: 135
MANOR ROAD
FairOver: SAWMILL BRANCH
1.1 MI S OF JARRETTSV. PK, Baltimore, MD
Built 1962 Load: 32.7 t ADT: 4,207
CINDER ROAD
FairOver: SPRING BRANCH
0.88 MI E OF MD 45, Baltimore, MD
Built 1959 Load: 32.7 t ADT: 1,134
ELM ROAD
FairOver: WEST BRANCH HERBERT RUN
0.08 MI W OF OREGON AVE, Baltimore, MD
Built 1953 Load: 32.7 t ADT: 2,600
GWYNN OAK AVENUE
FairOver: DEAD RUN
0.05 MI S OF DOGWOOD RD, Baltimore, MD
Built 1956 Load: 32.7 t ADT: 6,000
SULPHUR SPRING ROA
FairOver: WEST BRANCH HERBERT RUN
0.40 MI W OF US 1, Baltimore, MD
Built 1959 Load: 32.7 t ADT: 4,355
TOWSONTOWN BOULEVA
FairOver: TOWSON RUN
0.15 MI E OF MD 139, Baltimore, MD
Built 1964 Load: 32.7 t ADT: 34,307
REGESTER AVENUE
FairOver: HERRING RUN
0.25 MI W OF MD 542, Baltimore, MD
Built 1965 Load: 32.7 t ADT: 2,765
SPARKS ROAD
FairOver: TRIBUTARY TO CARROLL BRA
0.3 MI W OF CARROLL RD, Baltimore, MD
Built 1990 Load: 32.7 t ADT: 2,525
SCOTT ADAM ROAD
FairOver: TRIBUTARY OF BEAVER DAM
0.09 MI E OF MD 45, Baltimore, MD
Built 1965 Load: 32.7 t ADT: 2,200
EAST HOMBERG AVENU
FairOver: TRIBUTARY TO DEEP CREEK
50 FT. SW. OF MD RTE 702, Baltimore, MD
Built 1975 Load: 32.7 t ADT: 2,638
WALTHER BOULEVARD
FairOver: WHITE MARSH RUN
0.6 MI E. EX. 31C I-695, Baltimore, MD
Built 1990 Load: 32.7 t ADT: 11,638
McDONOGH ROAD
FairOver: GWYNNS FALLS
0.15 MI W OF IS 795, Baltimore, MD
Built 1941 Load: 32.7 t ADT: 16,775
PRETTYBOY DAM ROAD
FairOver: PRETTYBOY RESERVOIR
2.6 MI N MOUNT CARMEL RD, Baltimore, MD
Built 1932 Load: 32.7 t ADT: 400
MILFORD MILL EAST
FairOver: TRIB OF GWYNNS FALLS
MILFORD MILL METRO, Baltimore, MD
Built 1986 Load: 32.7 t ADT: 300
I-95
FairOver: HONEYGO RUN
0.6 MI N OF MD 43, Baltimore, MD
Built 1963 Load: 32.7 t ADT: 172,113
I-895 SB
FairOver: I-695
I-895 SB Milepost 3.5, Baltimore, MD
Built 1957 Load: 32.7 t ADT: 8,846
IS 695
FairOver: IS 83 NBR
0.62 MILE SOUTH OF MD 139, Baltimore, MD
Built 1955 Load: 33.1 t ADT: 179,082
IS 83 NBR
FairOver: BUNKER HILL ROAD
1.08 MI N OF MD 137, Baltimore, MD
Built 1955 Load: 33.6 t ADT: 59,820
MD 147
FairOver: GUNPOWDER FALLS
0.03 MI S OF NOTCH CLIFF, Baltimore, MD
Built 1929 Load: 33.6 t ADT: 7,982
Read our methodology - how this data is sourced, computed, and verified.
Related
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.