US Bridges

US 1 SB over Little Patuxent River

Fair

Howard County, Maryland · 0.38 Mile South of Md 32 · Structure no. 100000130007012

Built
1900
125 years old, rebuilt 1929
Condition
Fair
inspected July 2024
Type
Arch - Deck
Concrete
Length
97 ft
1 main span
Daily traffic
20,330
2013 count
Owner
State
State Highway Agency

About this bridge

US 1 SB over Little Patuxent River is a concrete arch - deck carrying US 1 SB over Little Patuxent River in Howard County, Maryland. It was built in 1900 and reconstructed in 1929, so it is 125 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 20,330 vehicles a day, roughly 8% of them trucks, projected to reach 24,697 by 2032. The structure is 97 ft (29.7 m) long and 44 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesUS 1 SB
CrossesLittle Patuxent River
Location0.38 Mile South of Md 32
RouteU.S. Route 1
CountyHoward County
StateMaryland
Coordinates39.1345, -76.81632
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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 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 geometry7: Better than present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating110.1 US tons
Inventory rating110.1 US tons

Structure

Structure typeArch - Deck
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length97 ft (29.7 m)
Longest span97 ft (29.6 m)
Deck width44 ft (13.3 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic20,330 (2013)
Projected traffic24,697 by 2032
Trucks8%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 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$284,000
NavigationNo navigation control on waterway

Frequently asked questions

When was US 1 SB over Little Patuxent River built?

It was built in 1900, making it 125 years old in 2025. It was reconstructed in 1929.

What condition is US 1 SB over Little Patuxent 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 July 2024.

How much traffic does US 1 SB over Little Patuxent River carry?

About 20,330 vehicles per day (2013 count), of which roughly 8% are trucks.

How long is US 1 SB over Little Patuxent River?

The structure is 97 ft (29.7 m) long with a longest span of 97 ft (29.6 m) and a deck 44 ft wide.

Who owns US 1 SB over Little Patuxent River?

It is owned by the State Highway Agency.