US Bridges

US 40 Alt over Antietam Creek

Fair

Washington County, Maryland · 0.42 M E of Kenly Avenue · Structure no. 100000210018010

Built
1823
202 years old, rebuilt 1930
Condition
Fair
inspected January 2024
Type
Arch - Deck
Masonry
Length
131 ft
3 main spans
Daily traffic
6,082
2009 count
Owner
State
State Highway Agency

About this bridge

US 40 Alt over Antietam Creek is a masonry arch - deck carrying US 40 Alt over Antietam Creek in Washington County, Maryland. It was built in 1823 and reconstructed in 1930, so it is 202 years old, older than the Maryland average of 52.6 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 6,082 vehicles a day, roughly 8% of them trucks, projected to reach 9,123 by 2029. The structure is 131 ft (39.9 m) long and 34 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesUS 40 Alt
CrossesAntietam Creek
Location0.42 M E of Kenly Avenue
RouteU.S. Route 40AL
CountyWashington County
StateMaryland
Coordinates39.61262, -77.71017
Functional classUrban Minor Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJanuary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating54 US tons
Inventory rating45 US tons

Structure

Structure typeArch - Deck
MaterialMasonry
DeckConcrete, cast-in-place
Main spans3
Design loadUnknown
Structure length131 ft (39.9 m)
Longest span47 ft (14.3 m)
Deck width34 ft (10.3 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,082 (2009)
Projected traffic9,123 by 2029
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusPossibly eligible for the National Register; requires further investigation
Work proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$293,000
NavigationNo navigation control on waterway

Frequently asked questions

When was US 40 Alt over Antietam Creek built?

It was built in 1823, making it 202 years old in 2025. It was reconstructed in 1930.

What condition is US 40 Alt over Antietam Creek in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in January 2024.

How much traffic does US 40 Alt over Antietam Creek carry?

About 6,082 vehicles per day (2009 count), of which roughly 8% are trucks.

How long is US 40 Alt over Antietam Creek?

The structure is 131 ft (39.9 m) long with a longest span of 47 ft (14.3 m) and a deck 34 ft wide.

Who owns US 40 Alt over Antietam Creek?

It is owned by the State Highway Agency.