County profile · official public datasets

Washington County, MD

300 public highway bridges tracked in the FHWA National Bridge Inventory: 28.3% rated Good, 67% Fair, 4.7% Poor.

300
Public bridges
28.3%
Good condition
4.7%
Poor condition

The verdict

According to the Federal Highway Administration's 2024 National Bridge Inventory.

Washington County pairs a better-than-median Poor-condition share among rated counties in the state with an older average build year than the state inventory.

Top 50%
lowest Poor share in state
4.7%
Poor-condition share
300
public highway bridges
1956
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.

Washington County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Washington County ranks #12 of 24 Maryland counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 4.7%). Washington County, Maryland contains 300 public highway bridges. Roughly 28.3% are rated “Good,” 67% “Fair,” and 4.7% “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

300

Public highway bridges in Washington County

Good condition

28.3%

85 of 300 rated 7-9

Fair condition

67%

201 of 300 rated 5-6

Poor condition

4.7%

14 of 300 rated 4 or below

In-state Poor-share rank

#12 of 24

Among Maryland counties with 5+ bridges, lower share ranks better

Condition distribution

Share of 300 NBI-tracked bridges by lowest applicable component rating.

Good
28.3% (85)
Fair
67% (201)
Poor
4.7% (14)

Washington County's Poor-condition bridges carry 324,080 vehicle crossings a day

That is 6.7% of the county's reported daily bridge traffic on 4.7% of its bridges: Poor-condition structures carry more traffic than their share of the inventory. Each Poor bridge averages 23,149 crossings a day against 15,321 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 300 of 300 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

76.3% of Washington County's bridges have passed the 50-year mark

229 of the 300 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 28.3% 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 19.3% of the county's Poor-condition bridge traffic

IS 70 EB over US 11, built 1965, carries 62,680 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 14-bridge count understates how much of the daily burden sits on a single crossing.

Share is of the 324,080 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

When Washington County's bridges were built

300 bridges with a recorded construction year, grouped by decade

bridges

What this shows Construction peaked in the 1960s, when 118 of the county's bridges still in the inventory were built, which is 39.3% of those with a recorded year. That cohort is now 55 to 64 years old in the 2024 inventory. Its average build year is 1956, 16 years older than the Maryland average of 1972.

Source FHWA National Bridge Inventory (year built) As of 2024 NBI release

How Washington County compares with Maryland's closest counties by inventory size

The 5 Maryland counties nearest Washington County in number of bridges, with their condition splits. Its 4.7% Poor share is the 2nd-lowest of these 6. Its average build year of 1956 against a peer-group mean of 1973 is 17 years older.

Showing the 5 closest of 23 Maryland counties eligible for comparison.

Bridge inventory size and condition shares for Washington County and the 5 Maryland counties closest to it in inventory size
County Bridges Poor
Anne Arundel County 389 1.5%
Baltimore city County 374 8.6%
Howard County 309 5.8%
Washington County (this page) 300 4.7%
Harford County 275 4.7%
Allegany County 245 6.1%

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 Washington 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 Washington County, both outside Maryland so the neighborhoods are not the same-state size table above.

Similar inventory size

Nearest county inventories outside MD (300 bridges here).

Similar average build year

Nearest mean year-built outside MD (1956 here).

Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.

All 300 Good 85 Fair 201 Poor 14

Good-condition bridges (85)

UNNAMED ROAD

Good

Over: LITTLE CONOCOCHEAGUE CRE

250 FT W OF BLAIRS VALLEY, Washington, MD

Built 2002 Load: 15.0 t ADT: 10

UNNAMED ROAD

Good

Over: RATTLE RUN

500FT N OF MOORESVILLE RD, Washington, MD

Built 1997 Load: 15.9 t ADT: 10

DAM #4 ROAD

Good

Over: C&O CANAL

0.9 miles from Dam #4 on, Washington, MD

Built 1971 Load: 22.7 t ADT: 212

WARNER HOLLOW ROAD

Good

Over: TRIBUTARY OF EDGEMONT RE

0.95 MI SE OF MD RTE 491, Washington, MD

Built 1985 Load: 28.1 t ADT: 96

BARTOW DRIVE

Good

Over: TRIBUTARY TO CONOCOCHEAG

0.17 MI NORTH OF US RT 40, Washington, MD

Built 2000 Load: 32.2 t ADT: 2,418

MD 144WB

Good

Over: LITTLE TONOLOWAY CREEK

0.4 MILE EAST OF IS 68, Washington, MD

Built 1965 Load: 32.7 t ADT: 972

HOPEWELL ROAD

Good

Over: BR OF CONOCOCHEAGUE CREE

NW OF IS 81/US 11, Washington, MD

Built 1965 Load: 32.7 t ADT: 2,454

HOPEWELL ROAD

Good

Over: TRIBUTARY OF SEMPLE RUN

0.34 MI NE OF US RTE 11, Washington, MD

Built 1964 Load: 32.7 t ADT: 7,648

GOVERNOR LANE BOUL

Good

Over: TRIBUTARY OF CONOCOCHEAG

0.3 MI N OF MD RTE 68, Washington, MD

Built 1972 Load: 32.7 t ADT: 7,589

NORTH HAWBAKER CIR

Good

Over: TOMS RUN

0.09 MI. W. OF N MILL ST., Washington, MD

Built 1977 Load: 32.7 t ADT: 56

IS 70 RAMP B

Good

Over: BEAVER CREEK

0.08 MI W OF MD 66, Washington, MD

Built 1968 Load: 34.0 t ADT: 7,850

MARBLE QUARRY ROAD

Good

Over: LITTLE ANTIETAM CREEK

0.4 MI NW OF MD RTE 67, Washington, MD

Built 1920 Load: 34.7 t ADT: 178

GARRETTS MILL ROAD

Good

Over: ISRAEL CREEK

0.25 MI W OF MD RTE 67, Washington, MD

Built 2019 Load: 36.3 t ADT: 590

FROG EYE ROAD

Good

Over: ISRAEL CREEK

0.1M W OF ROHRERSVILLE RD, Washington, MD

Built 2021 Load: 36.8 t ADT: 100

IS 68

Good

Over: LITTLE TONOLOWAY CREEK

1.46 MILES E OF MD 144WB, Washington, MD

Built 1965 Load: 37.2 t ADT: 19,000

IS 70 EB

Good

Over: CONOCOCHEAGUE CREEK

1.34 MILES WEST OF MD 63, Washington, MD

Built 1966 Load: 38.9 t ADT: 17,276

IS 70 WB

Good

Over: CONOCOCHEAGUE CREEK

1.34 MILES WEST OF MD 63, Washington, MD

Built 1966 Load: 38.9 t ADT: 17,276

IS 81 RAMP 8

Good

Over: BR OF CONOCOCHEAGUE CREE

0.10 MI N OF US 11, Washington, MD

Built 1965 Load: 39.9 t ADT: 3,561

IS 70 EB

Good

Over: MD 65

1.35 MILES EAST OF MD 632, Washington, MD

Built 2023 Load: 40.8 t ADT: 60,800

LANDIS ROAD

Good

Over: TRIB. OF LANDIS SPRING

JCT. LONDONTOWNE DR, Washington, MD

Built 2001 Load: 40.8 t ADT: 423

LEITERS MILL ROAD

Good

Over: ANTIETAM CREEK

0.2 MI N OF MD RTE 60, Washington, MD

Built 1839 Load: 41.7 t ADT: 1,470

IS 70 EB

Good

Over: IS 70 RAMP A

0.01 MILE WEST OF US 522, Washington, MD

Built 1965 Load: 42.1 t ADT: 19,400

EARTH CARE ROAD

Good

Over: CONOCOCHEAGUE CREEK

0.4 MI NORTH OF US 40, Washington, MD

Built 2000 Load: 42.2 t ADT: 721

KIRK WOODS PARK RO

Good

Over: LITTLE TONOLOWAY CREEK

0.76 MI. W OF US 40, Washington, MD

Built 2008 Load: 42.6 t ADT: 53

MD 67

Good

Over: US 340

0.24 MILE SOUTH OF MD 67D, Washington, MD

Built 1969 Load: 43.5 t ADT: 5,202

OLD FORGE ROAD

Good

Over: ANTIETAM CREEK

1.2 MI W OF MD RTE 62, Washington, MD

Built 1863 Load: 43.5 t ADT: 580

IS 81 NB

Good

Over: POTOMAC RIVER

ON WEST VIRGINIA LINE, Washington, MD

Built 1965 Load: 43.7 t ADT: 61,300

IS 81 SB

Good

Over: POTOMAC RIVER

ON WEST VIRGINIA LINE, Washington, MD

Built 1965 Load: 43.7 t ADT: 61,300

IS 70 EB

Good

Over: CRYSTAL FALLS DRIVE

1.98 MILES WEST OF MD 66, Washington, MD

Built 2024 Load: 44.1 t ADT: 70,975

MILLERS CHURCH RD

Good

Over: ANTIETAM CREEK

0.06 MI W OF MD RTE 60, Washington, MD

Built 1984 Load: 44.4 t ADT: 193

MD 34

Good

Over: BR OF LITTLE ANTIETAM CK

0.94 MILE EAST OF MD 845A, Washington, MD

Built 1956 Load: 45.4 t ADT: 4,951

MD 63

Good

Over: ST JAMES RUN

AT N/S RAILROAD, Washington, MD

Built 2017 Load: 46.0 t ADT: 650

IS 70 WB

Good

Over: CSX TRANS.

0.18 MILE EAST OF MD 65, Washington, MD

Built 1968 Load: 46.3 t ADT: 60,800

IS 70 EB

Good

Over: LITTLE CONOCOCHEAGUE CRE

1.34 MILES EAST OF MD 68, Washington, MD

Built 1965 Load: 47.2 t ADT: 40,770

MD 64

Good

Over: CSX TRANSPORTATION

0.06 MILE EAST OF MD 491, Washington, MD

Built 2000 Load: 47.6 t ADT: 6,732

MILLS ROAD

Good

Over: SHARMANS BRANCH

0.6 MI S OF BURNSIDE DR, Washington, MD

Built 2009 Load: 48.1 t ADT: 965

WILSON BOULEVARD

Good

Over: PINE STREET

0.05 MI E of Route 11, Washington, MD

Built 1983 Load: 49.0 t ADT: 16,448

HALFWAY BOULEVARD

Good

Over: TRIBUTARY OF CONOCOCHEAG

0.6 MI WEST OF I-81, Washington, MD

Built 2005 Load: 49.4 t ADT: 4,256

SOUTH POINTE DRIVE

Good

Over: TRIBUTARY OF ANTIETAM CR

.3 MI N OF E OAK RIDGE DR, Washington, MD

Built 2000 Load: 49.4 t ADT: 3,885

MARYLAND 63

Good

Over: CSX TRANS.

1.08 MILES NORTH OF US 11, Washington, MD

Built 1959 Load: 49.9 t ADT: 12,600

IS70/US40 RP A

Good

Over: IS 70 EBR & RAMP B

0.3 M E OF BR NO 2109200, Washington, MD

Built 1989 Load: 49.9 t ADT: 26,700

MARBLE QUARRY ROAD

Good

Over: LITTLE ANTIETAM CREEK

1.02 MI NW OF MD RTE 67, Washington, MD

Built 2007 Load: 49.9 t ADT: 223

IS 68 EB

Good

Over: MD 903

1.54 M E OF ALLEGANY CO, Washington, MD

Built 1984 Load: 50.3 t ADT: 19,950

IS 70

Good

Over: SEMPLE RUN

0.25 MILE WEST OF IS 81, Washington, MD

Built 1966 Load: 50.8 t ADT: 45,040

IS 70 WB CD

Good

Over: IS 81

0.35 MI W OF US 11, Washington, MD

Built 1964 Load: 50.8 t ADT: 6,988

SPRECHER ROAD

Good

Over: MARSH RUN

0.68 MI S OF BAKERSVILLE, Washington, MD

Built 1920 Load: 51.8 t ADT: 347

SPRECHER ROAD

Good

Over: MARSH RUN

0.07 MI S OF BAKERSVILLE, Washington, MD

Built 1986 Load: 51.8 t ADT: 380

IS 68 WB

Good

Over: MD 903

1.54 M E OF ALLEGANY CO, Washington, MD

Built 1984 Load: 52.2 t ADT: 19,950

BATTLETOWN ROAD

Good

Over: ANTIETAM CREEK

0.45 MI W OF MD RTE 60, Washington, MD

Built 1985 Load: 53.1 t ADT: 126

MCDADE RD

Good

Over: US 40

@ US 40, Washington, MD

Built 1960 Load: 54.0 t ADT: 150

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.