Total bridges
300
Public highway bridges in Washington County
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.
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
- pre-1900 22
Built before 1900
22 bridges
- 1900s 11
1900–1909
11 bridges
- 1910s 6
1910–1919
6 bridges
- 1920s 11
1920–1929
11 bridges
- 1930s 15
1930–1939
15 bridges
- 1940s 9
1940–1949
9 bridges
- 1950s 29
1950–1959
29 bridges
- 1960s
1960–1969
118 bridges
- 1970s 15
1970–1979
15 bridges
- 1980s 25
1980–1989
25 bridges
- 1990s 13
1990–1999
13 bridges
- 2000s 16
2000–2009
16 bridges
- 2010s 5
2010–2019
5 bridges
- 2020s 5
2020–2029
5 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.
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.
| County | Bridges | Good | Fair | Poor | Avg. built |
|---|---|---|---|---|---|
| Anne Arundel County | 389 | 32.6% | 65.8% | 1.5% | 1980 |
| Baltimore city County | 374 | 16% | 75.4% | 8.6% | 1964 |
| Howard County | 309 | 35.9% | 58.3% | 5.8% | 1978 |
| Washington County (this page) | 300 | 28.3% | 67% | 4.7% | 1956 |
| Harford County | 275 | 38.2% | 57.1% | 4.7% | 1973 |
| Allegany County | 245 | 36.7% | 57.1% | 6.1% | 1971 |
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).
- DeKalb County, AL · 300 bridges
- Christian County, KY · 300 bridges
- Newton County, MO · 300 bridges
- Dawson County, NE · 300 bridges
Similar average build year
Nearest mean year-built outside MD (1956 here).
- Philadelphia County, PA · avg 1956 · 585 bridges
- Cochise County, AZ · avg 1956 · 501 bridges
- Hampden County, MA · avg 1956 · 428 bridges
- Stanislaus County, CA · avg 1956 · 386 bridges
Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.
Fair-condition bridges (201)
LICKING CREEK ROAD
FairOver: LANES RUN
0.9 MI N OF US RTE 40, Washington, MD
Built 1960 Load: 10.0 t ADT: 40
CRYSTAL FALLS DRIV
FairOver: BEAVER CREEK
0.36 MI N OF MD RTE 64, Washington, MD
Built 1890 Load: 10.9 t ADT: 678
MILLBROOK ROAD
FairOver: LITTLE ANTIETAM CREEK
0.5 MI W OF MD RTE 67, Washington, MD
Built 1920 Load: 10.9 t ADT: 1,173
PARK ROAD 2
FairOver: LITTLE TONOLOWAY CREEK
0.16 MI N MD RT 144, Washington, MD
Built 1950 Load: 12.8 t ADT: 123
KEEDYSVILLE ROAD
FairOver: ANTIETAM CREEK
0.8 MI NW OF MD RTE 34, Washington, MD
Built 1830 Load: 13.6 t ADT: 1,173
DOGSTREET ROAD
FairOver: LITTLE ANTIETAM CREEK
1.89 MI W OF MD RTE 67, Washington, MD
Built 1850 Load: 13.6 t ADT: 1,560
US 340
FairOver: POTOMAC RIVER CSX TRANS
ON VIRGINIA STATE LINE, Washington, MD
Built 1946 Load: 14.5 t ADT: 20,830
PROSPECT STREET
FairOver: ANTIETAM STREET
1000 FT W OF US RTE 40 E, Washington, MD
Built 1836 Load: 15.0 t ADT: 2,730
WOLFSVILLE ROAD
FairOver: BEAVER CREEK
0.2 MI S OF MD RTE 844, Washington, MD
Built 1915 Load: 16.7 t ADT: 1,500
RODMAN AVENUE
FairOver: SHERRICKS RUN
0.16km (0.1 MILES) TO ROH, Washington, MD
Built 1965 Load: 18.1 t ADT: 4,300
GAPLAND ROAD
FairOver: ISRAEL CREEK
0.08 MI W OF MD RTE 67, Washington, MD
Built 1922 Load: 22.7 t ADT: 160
MILLBROOK ROAD
FairOver: LITTLE ANTIETAM CREEK
0.4 MI W OF MD RTE 67, Washington, MD
Built 1965 Load: 22.7 t ADT: 1,467
MD 34
FairOver: ANTIETAM CREEK
1.2 MILES EAST OF MD 65, Washington, MD
Built 1958 Load: 23.1 t ADT: 4,951
US 40
FairOver: LICKING CREEK
0.26 MILE EAST OF IS 70, Washington, MD
Built 1938 Load: 23.6 t ADT: 1,455
HIGH GERMANY ROAD
FairOver: SIDELING HILL CREEK
0.3 MI N OF IS 68, Washington, MD
Built 1961 Load: 24.0 t ADT: 153
ROWE ROAD
FairOver: LITTLE ANTIETAM CREEK
0.13 MI SW OF MD RTE 64, Washington, MD
Built 1974 Load: 25.4 t ADT: 934
US 40
FairOver: IS 70
0.03 MI W OF FREDERICK CO, Washington, MD
Built 1968 Load: 25.8 t ADT: 7,477
IS 70 EB
FairOver: GR TONOLOWAY CK CO RDS
0.67 MILE W OF MD 144WB, Washington, MD
Built 1965 Load: 26.3 t ADT: 19,611
MARBLE QUARRY ROAD
FairOver: LITTLE ANTIETAM CREEK
0.81 MI NW OF MD RTE 67, Washington, MD
Built 1985 Load: 26.3 t ADT: 178
JEFFERSON BOULEVAR
FairOver: HAMILTON RUN
0.5 MI E CANNON AVE, Washington, MD
Built 1929 Load: 26.3 t ADT: 9,505
SERVICE ROAD
FairOver: BEAVER CREEK
0.11 MILE WEST OF MD 66, Washington, MD
Built 1968 Load: 26.8 t ADT: 150
US 40
FairOver: CONOCOCHEAGUE CREEK
1.92 MILES EAST OF MD 57, Washington, MD
Built 1936 Load: 27.2 t ADT: 11,832
US 40 ALT
FairOver: LITTLE BEAVER CREEK
2.06 MILES WEST OF MD 68, Washington, MD
Built 1949 Load: 27.2 t ADT: 6,082
BURNSIDE BRIDGE RO
FairOver: ANTIETAM CREEK
0.83 MI SW OF MD RTE 34, Washington, MD
Built 1965 Load: 27.2 t ADT: 461
US 40 WB
FairOver: ANTIETAM CREEK
AT EASTERN BOULEVARD, Washington, MD
Built 1936 Load: 29.5 t ADT: 21,558
SECURITY ROAD
FairOver: HAMILTON RUN
AT INT OF BROOKLINE AVE, Washington, MD
Built 1957 Load: 29.5 t ADT: 2,518
GARDENHOUR RD
FairOver: LITTLE ANTIETAM CREEK
0.45 MI W OF MD RTE 64, Washington, MD
Built 1910 Load: 29.9 t ADT: 315
IS 70 EB
FairOver: RAMP E2 FROM MD 615
2.3 MILES E OF MD 144WB, Washington, MD
Built 1960 Load: 30.4 t ADT: 34,830
IS 70 WB
FairOver: RAMP E2 FROM MD 615
2.3 MILES E OF MD 144WB, Washington, MD
Built 1960 Load: 30.4 t ADT: 34,830
IS 81 NB
FairOver: SHOWALTER ROAD
1.66 MILES S OF PA LINE, Washington, MD
Built 1958 Load: 30.8 t ADT: 47,030
IS 81 SB
FairOver: SHOWALTER ROAD
1.66 MILES S OF PA LINE, Washington, MD
Built 1958 Load: 30.8 t ADT: 47,030
WALNUT POINT RD
FairOver: IS 70
1.17 MILES S OF US 40, Washington, MD
Built 1965 Load: 30.8 t ADT: 566
GOSSARD MILL ROAD
FairOver: ROCKDALE RUN
0.8 MI SE OF MD 494, Washington, MD
Built 1977 Load: 30.8 t ADT: 330
US 40
FairOver: LITTLE CONOCOCHEAGUE CRE
1.12 MILES WEST OF MD 57, Washington, MD
Built 1900 Load: 32.7 t ADT: 3,912
MD 56
FairOver: LITTLE CONOCOCHEAGUE CRE
0.88 MILE WEST OF MD 68, Washington, MD
Built 1907 Load: 32.7 t ADT: 681
MD 64
FairOver: BEAVER CREEK
0.37 MILE WEST OF MD 66, Washington, MD
Built 1957 Load: 32.7 t ADT: 8,922
MD 64
FairOver: LITTLE ANTIETAM CREEK
2.07 MILES WEST OF MD 418, Washington, MD
Built 1958 Load: 32.7 t ADT: 6,732
MD 64
FairOver: LITTLE ANTIETAM CREEK
1.38 MILES WEST OF MD 418, Washington, MD
Built 1958 Load: 32.7 t ADT: 6,732
MD 68
FairOver: LITTLE CONOCOCHEAGUE CRE
0.75 MILE WEST OF MD 56, Washington, MD
Built 1974 Load: 32.7 t ADT: 2,482
MD 68
FairOver: BEAVER CREEK
2.24 MILES EAST OF MD 65, Washington, MD
Built 1824 Load: 32.7 t ADT: 2,592
MD 550
FairOver: TRIB TO LAKE ROYER
0.42 MILE NORTH OF MD 491, Washington, MD
Built 1945 Load: 32.7 t ADT: 1,630
MD 844
FairOver: BEAVER CREEK
0.09 MILE EAST OF MD 64, Washington, MD
Built 1900 Load: 32.7 t ADT: 599
MD 63
FairOver: BR OF CONOCOCHEAGUE CREE
0.2 MILE SOUTH OF IS 70, Washington, MD
Built 1959 Load: 32.7 t ADT: 9,581
MD 67
FairOver: DOG CREEK
1.87 MILES N OF MD 67A, Washington, MD
Built 1959 Load: 32.7 t ADT: 5,422
MD 67
FairOver: LITTLE ANTIETAM CREEK
0.41 MILE S OF MD 858F, Washington, MD
Built 1959 Load: 32.7 t ADT: 5,422
MD 491
FairOver: LITTLE ANTIETAM CREEK
1.21 MILES NORTH OF MD 64, Washington, MD
Built 1961 Load: 32.7 t ADT: 2,130
MD 632
FairOver: ST JAMES RUN
0.02 MILE SOUTH OF IS 70, Washington, MD
Built 1966 Load: 32.7 t ADT: 5,601
MD 66
FairOver: BLACKROCK CREEK
0.27 MILE SOUTH OF IS 70, Washington, MD
Built 1968 Load: 32.7 t ADT: 5,291
BOYD ROAD
FairOver: CAMP SPRING RUN
0.88 M S 0F US RTE 40, Washington, MD
Built 1950 Load: 32.7 t ADT: 1,116
HOPEWELL ROAD
FairOver: SEMPLE RUN
0.19 MI S OF IS 70, Washington, MD
Built 1966 Load: 32.7 t ADT: 933
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.