US Bridges

US 1 Alt over Anacostia River

Fair

Prince George's County, Maryland · 0.05 Mile South of Md 450 · Structure no. 100000160008010

Built
1955
70 years old, rebuilt 2006
Condition
Fair
inspected April 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
275 ft
3 main spans
Daily traffic
22,252
2009 count
Owner
State
State Highway Agency

About this bridge

US 1 Alt over Anacostia River is a steel continuous stringer/multi-beam or girder carrying US 1 Alt over Anacostia River in Prince George's County, Maryland. It was built in 1955 and reconstructed in 2006, so it is 70 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 6 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 22,252 vehicles a day, roughly 8% of them trucks, projected to reach 24,261 by 2026. The structure is 275 ft (83.8 m) long and 71 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesUS 1 Alt
CrossesAnacostia River
Location0.05 Mile South of Md 450
RouteU.S. Route 1
CountyPrince George's County
StateMaryland
Coordinates38.93852, -76.9433
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
Deck8 Very GoodNo problems noted.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
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 rating81 US tons
Inventory rating48.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length275 ft (83.8 m)
Longest span104 ft (31.7 m)
Deck width71 ft (21.5 m)
Roadway width58 ft (17.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic22,252 (2009)
Projected traffic24,261 by 2026
Trucks8%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$1.3 million
NavigationNo navigation control on waterway

Frequently asked questions

When was US 1 Alt over Anacostia River built?

It was built in 1955, making it 70 years old in 2025. It was reconstructed in 2006.

What condition is US 1 Alt over Anacostia River 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 April 2024.

How much traffic does US 1 Alt over Anacostia River carry?

About 22,252 vehicles per day (2009 count), of which roughly 8% are trucks.

How long is US 1 Alt over Anacostia River?

The structure is 275 ft (83.8 m) long with a longest span of 104 ft (31.7 m) and a deck 71 ft wide.

Who owns US 1 Alt over Anacostia River?

It is owned by the State Highway Agency.