US Bridges

US 1 over Patapsco River

Fair

Baltimore County, Maryland · On Howard CO Line · Structure no. 100000030010010

Built
1915
110 years old, rebuilt 1952
Condition
Fair
inspected March 2024
Type
Arch - Deck
Concrete
Length
272 ft
2 main spans
Daily traffic
25,532
2009 count
Owner
State
State Highway Agency

About this bridge

US 1 over Patapsco River is a concrete arch - deck carrying US 1 over Patapsco River in Baltimore County, Maryland. It was built in 1915 and reconstructed in 1952, so it is 110 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 25,532 vehicles a day, roughly 8% of them trucks, projected to reach 29,173 by 2033. The structure is 272 ft (82.9 m) long and 70 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesUS 1
CrossesPatapsco River
LocationOn Howard CO Line
RouteU.S. Route 1
CountyBaltimore County
StateMaryland
Coordinates39.21793, -76.70629
Functional classUrban Other Principal 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 protection4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionMarch 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 adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating91.9 US tons
Inventory rating55 US tons

Structure

Structure typeArch - Deck
MaterialConcrete
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length272 ft (82.9 m)
Longest span100 ft (30.5 m)
Deck width70 ft (21.4 m)
Roadway width58 ft (17.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic25,532 (2009)
Projected traffic29,173 by 2033
Trucks8%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemYes

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 over Patapsco River built?

It was built in 1915, making it 110 years old in 2025. It was reconstructed in 1952.

What condition is US 1 over Patapsco 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 March 2024.

How much traffic does US 1 over Patapsco River carry?

About 25,532 vehicles per day (2009 count), of which roughly 8% are trucks.

How long is US 1 over Patapsco River?

The structure is 272 ft (82.9 m) long with a longest span of 100 ft (30.5 m) and a deck 70 ft wide.

Who owns US 1 over Patapsco River?

It is owned by the State Highway Agency.