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.
All bridges (783)
IS 95 SBR & RAMP
FairOver: SULPHUR SPRING ROAD
0.32 MILE SOUTH OF IS 695, Baltimore, MD
Built 1971 Load: 33.6 t ADT: 176,796
MALVERN AVENUE
FairOver: TOWSON RUN
0.1 MI W CHARLES ST, Baltimore, MD
Built 1910 Load: 33.6 t ADT: 2,373
MD 695 IL
FairOver: MD 695 RMP 1(MERRITT BL)
0.26 MILE SOUTH OF MD 151, Baltimore, MD
Built 1966 Load: 34.0 t ADT: 41,012
SELFORD ROAD
FairOver: IS 95
0.13 MI N OF IS 195, Baltimore, MD
Built 1970 Load: 34.0 t ADT: 4,011
MANTUA MILL ROAD
FairOver: WESTERN RUN
0.07 MI E OF MD 128, Baltimore, MD
Built 1986 Load: 34.0 t ADT: 450
OREMS ROAD
FairOver: MIDDLE RIVER
0.3 MI S. OF MARTIN BLVD., Baltimore, MD
Built 1980 Load: 34.0 t ADT: 5,165
DANVILLE ROAD DAL
FairOver: TRIBUTARY TO REDHOUSE CR
1.0MI SW US1 AND I-695, Baltimore, MD
Built 1948 Load: 34.0 t ADT: 12,981
MD 30
FairOver: MARYLAND MIDLAND RR
0.62 MILE NORTH OF MD 795, Baltimore, MD
Built 1936 Load: 34.5 t ADT: 18,070
IS 695 & RAMPS 4
FairOver: DEAD RUN
0.19 M N OF CROSBY ROAD, Baltimore, MD
Built 1961 Load: 34.5 t ADT: 188,860
IS 70 WBR
FairOver: ROLLING ROAD
0.54 MILE WEST OF IS 695, Baltimore, MD
Built 1964 Load: 34.5 t ADT: 94,221
WOODLAWN DRIVE
FairOver: DEAD RUN
0.87 MI N OF IS 70, Baltimore, MD
Built 1960 Load: 34.5 t ADT: 18,500
TOM DAY BOULEVARD
FairOver: EAST BRANCH HERBERT RUN
0.02 MI W OF US 1, Baltimore, MD
Built 1960 Load: 34.5 t ADT: 3,484
MD 166 SBR
FairOver: RAMP 5 FROM UMBC
0.38 MILE NORTH OF IS 195, Baltimore, MD
Built 1975 Load: 34.9 t ADT: 9,143
I-895 NB
FairOver: HAMMONDS FERRY RD
Milepost M3.8, Baltimore, MD
Built 1957 Load: 34.9 t ADT: 10,671
I-895 SB
FairOver: HAMMONDS FERRY RD
I-895 SB Milepost 3.8, Baltimore, MD
Built 1957 Load: 34.9 t ADT: 10,334
MD 7
FairOver: GUNPOWDER FALLS
1.74 MI S OF HARFORD CO, Baltimore, MD
Built 1987 Load: 35.4 t ADT: 8,863
MD 41
FairOver: TRIB TO HERRING RUN
0.95 MI N OF BALT CITY, Baltimore, MD
Built 1963 Load: 35.4 t ADT: 29,990
IS 95 RAMP E
FairOver: IS 195 SBR
0.79 MI N OF HOWARD CO, Baltimore, MD
Built 1970 Load: 35.4 t ADT: 6,452
MD 146
FairOver: LOCH RAVEN RESERVOIR
0.48 M N OF OLD BOSLEY RD, Baltimore, MD
Built 1976 Load: 35.4 t ADT: 20,421
CUB HILL ROAD
FairOver: TRIBUTARY TO GUNPOWDER F
0.2 MI E OF CROMWELL BR R, Baltimore, MD
Built 1920 Load: 35.4 t ADT: 7,580
BEETREE ROAD
FairOver: BEETREE RUN
1.4 MI W OF MD RTE 45, Baltimore, MD
Built 1979 Load: 35.4 t ADT: 87
RUTHERFORD ROAD
FairOver: DEAD RUN
0.38 MI S OF WINDSOR BLVD, Baltimore, MD
Built 1968 Load: 35.4 t ADT: 3,998
MD 7
FairOver: HONEYGO RUN
0.07 MI S OF EBENEZER RD, Baltimore, MD
Built 1950 Load: 35.8 t ADT: 16,450
MD 147
FairOver: LITTLE GUNPOWDER FALLS
ON HARFORD CO LINE, Baltimore, MD
Built 1928 Load: 35.8 t ADT: 10,192
MD 695 OL
FairOver: AMTRAK & BACK RIVER
0.75 MILE SOUTH OF MD 150, Baltimore, MD
Built 1968 Load: 35.8 t ADT: 49,829
IS 70
FairOver: WOODLAWN DRIVE
0.53 MI E OF IS 695, Baltimore, MD
Built 1968 Load: 35.8 t ADT: 25,300
BEAVER DAM ROAD
FairOver: OREGON BRANCH
0.3 MI S OF SHAWAN ROAD, Baltimore, MD
Built 1952 Load: 35.8 t ADT: 6,171
SULPHUR SPRING ROA
FairOver: EAST BRANCH HERBERT RUN
INTER SELMA & SUL SPRNG, Baltimore, MD
Built 1962 Load: 35.8 t ADT: 20,845
FITCH AVENUE
FairOver: TRIBUTARY TO STEMMERS RU
0.2 MI E OF BELAIR RD, Baltimore, MD
Built 1979 Load: 35.8 t ADT: 2,860
I-895 NB
FairOver: HALETHORPE FARMS RD
Milepost M2.4, Baltimore, MD
Built 1957 Load: 35.8 t ADT: 7,507
MD 139
FairOver: TOWSON RUN
0.05 M N/TOWSONTOWN BLVD, Baltimore, MD
Built 1957 Load: 36.3 t ADT: 39,381
HOLLINS FERRY ROAD
FairOver: I-695
0.27 MI W OF HOLLINS FERR, Baltimore, MD
Built 1957 Load: 36.3 t ADT: 19,562
IS 83 RAMP C
FairOver: IS 695 MTA LIGHT RAIL
0.22 MILE SOUTH OF MD 131, Baltimore, MD
Built 1973 Load: 36.3 t ADT: 49,349
COVE ROAD
FairOver: MD 695
1.03 MI S OF MD 151, Baltimore, MD
Built 1971 Load: 36.3 t ADT: 5,699
MD 695 OL
FairOver: MD702 NE CR &RP 7 A
0.34 MI N OF US 40, Baltimore, MD
Built 1972 Load: 36.3 t ADT: 69,922
MD 166 NBR
FairOver: RAMP 5 FROM UMBC
0.38 MILE NORTH OF IS 195, Baltimore, MD
Built 1975 Load: 36.3 t ADT: 11,636
MARRIOTTSVILLE ROA
FairOver: FALLS RUN
0.28 MI W OF W CHAPEL RD, Baltimore, MD
Built 1984 Load: 36.3 t ADT: 4,050
RAMP X
FairOver: OWINGS MILLS BOULEVARD
0.4 MI SW OF IS 795, Baltimore, MD
Built 1986 Load: 36.3 t ADT: 3,131
COVERED BRIDGE ROA
FairOver: TRIBUTARY TO GUNPOWDER F
0.25 NE OF NORTH END MD41, Baltimore, MD
Built 1960 Load: 36.3 t ADT: 1,947
MD 140
FairOver: GWYNNS FALLS
0.20 MI N OF MD 940, Baltimore, MD
Built 1973 Load: 36.7 t ADT: 33,480
MD 41
FairOver: TRIB TO HERRING RUN
0.4 M N OF TAYLOR AVENUE, Baltimore, MD
Built 1963 Load: 36.7 t ADT: 31,890
FOREST & PARKS ROA
FairOver: IS 70
1.4 MI W OF IS 70, Baltimore, MD
Built 1965 Load: 36.7 t ADT: 3
MD 702 EBR
FairOver: MD 150
1.20 MI E OF MD 695, Baltimore, MD
Built 1970 Load: 36.7 t ADT: 25,819
IS 95
FairOver: WEST BRANCH HERBERT RUN
0.22 MILE SOUTH OF US 1, Baltimore, MD
Built 1969 Load: 36.7 t ADT: 176,834
HARTLEY MILL ROAD
FairOver: LONG GREEN CREEK
0.2 MI NW OF HARFORD RD, Baltimore, MD
Built 1975 Load: 36.7 t ADT: 306
DEANWOOD ROAD
FairOver: TRIBUTARY TO HERRING RUN
0.2 MI E OF MD RTE 542, Baltimore, MD
Built 1966 Load: 36.7 t ADT: 4,715
MD 695 IL
FairOver: KELSO DRIVE
0.02 MILE SOUTH OF MD 702, Baltimore, MD
Built 1969 Load: 37.2 t ADT: 96,082
MD 695 IL
FairOver: AMTRAK & BACK RIVER
0.75 MILE SOUTH OF MD 150, Baltimore, MD
Built 1968 Load: 37.6 t ADT: 49,829
MD 702 WBR
FairOver: MACE AVENUE
0.29 MILE EAST OF MD 695, Baltimore, MD
Built 1970 Load: 37.6 t ADT: 19,406
IS 95 SBR
FairOver: OAKLAND ROAD
0.76 MILE NORTH OF IS 195, Baltimore, MD
Built 1969 Load: 37.6 t ADT: 176,796
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.