US Bridges

Mount Aetna Road over Antietam Creek

Fair

Washington County, Maryland · 0.8 MI W of US RTE 40 · Structure no. 200000W-H-32010

Built
1980
45 years old
Condition
Fair
inspected February 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
200 ft
2 main spans
Daily traffic
5,120
2024 count
Owner
City
City or Municipal Highway Agency

About this bridge

Mount Aetna Road over Antietam Creek is a steel continuous stringer/multi-beam or girder carrying Mount Aetna Road over Antietam Creek in Washington County, Maryland. It was built in 1980, so it is 45 years old, younger 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 5,120 vehicles a day, roughly 5% of them trucks, projected to reach 6,250 by 2044. The structure is 200 ft (61 m) long and 52 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesMount Aetna Road
CrossesAntietam Creek
Location0.8 MI W of US RTE 40
RouteCity Street 1750
CountyWashington County
StateMaryland
Coordinates39.63091, -77.71041
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
Deck7 GoodSome minor problems.
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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating91.9 US tons
Inventory rating55 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length200 ft (61 m)
Longest span100 ft (30.5 m)
Deck width52 ft (15.9 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,120 (2024)
Projected traffic6,250 by 2044
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Mount Aetna Road over Antietam Creek built?

It was built in 1980, making it 45 years old in 2025.

What condition is Mount Aetna Road 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 February 2024.

How much traffic does Mount Aetna Road over Antietam Creek carry?

About 5,120 vehicles per day (2024 count), of which roughly 5% are trucks.

How long is Mount Aetna Road over Antietam Creek?

The structure is 200 ft (61 m) long with a longest span of 100 ft (30.5 m) and a deck 52 ft wide.

Who owns Mount Aetna Road over Antietam Creek?

It is owned by the City or Municipal Highway Agency.