US Bridges

Patterson Avenue over Tributary to Gwynns Fall

FairPosted for load

Baltimore County, Maryland · 0.75 MI NE of Liberty RD · Structure no. 200000B-0101010

Built
1960
65 years old
Condition
Fair
inspected November 2023
Type
Slab
Concrete
Length
54 ft
2 main spans
Daily traffic
12,265
2023 count
Owner
County
County Highway Agency

About this bridge

Patterson Avenue over Tributary to Gwynns Fall is a concrete slab carrying Patterson Avenue over Tributary to Gwynns Fall in Baltimore County, Maryland. It was built in 1960, so it is 65 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. Its operating status is: posted for load restriction.

It carries about 12,265 vehicles a day, roughly 5% of them trucks, projected to reach 16,587 by 2045. The structure is 54 ft (16.5 m) long and 60 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesPatterson Avenue
CrossesTributary to Gwynns Fall
Location0.75 MI NE of Liberty RD
RouteCounty Highway 1861
CountyBaltimore County
StateMaryland
Coordinates39.34738, -76.71454
Functional classUrban Local

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating42 US tons
Inventory rating25 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length54 ft (16.5 m)
Longest span25 ft (7.6 m)
Deck width60 ft (18.3 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic12,265 (2023)
Projected traffic16,587 by 2045
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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 Patterson Avenue over Tributary to Gwynns Fall built?

It was built in 1960, making it 65 years old in 2025.

What condition is Patterson Avenue over Tributary to Gwynns Fall 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 November 2023.

How much traffic does Patterson Avenue over Tributary to Gwynns Fall carry?

About 12,265 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is Patterson Avenue over Tributary to Gwynns Fall?

The structure is 54 ft (16.5 m) long with a longest span of 25 ft (7.6 m) and a deck 60 ft wide.

Who owns Patterson Avenue over Tributary to Gwynns Fall?

It is owned by the County Highway Agency.