US Bridges

Gwynn Oak Avenue over Gwynns Falls

Fair

Baltimore County, Maryland · 0.29 MI W of Balt City · Structure no. 100000030067010

Built
1900
125 years old, rebuilt 1937
Condition
Fair
inspected March 2023
Type
Arch - Deck
Concrete
Length
86 ft
2 main spans
Daily traffic
20,280
2009 count
Owner
State
State Highway Agency

About this bridge

Gwynn Oak Avenue over Gwynns Falls is a concrete arch - deck carrying Gwynn Oak Avenue over Gwynns Falls in Baltimore County, Maryland. It was built in 1900 and reconstructed in 1937, 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 20,280 vehicles a day, roughly 8% of them trucks, projected to reach 24,814 by 2026. The structure is 86 ft (26.2 m) long and 83 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesGwynn Oak Avenue
CrossesGwynns Falls
Location0.29 MI W of Balt City
RouteCounty Highway 8018
CountyBaltimore County
StateMaryland
Coordinates39.32475, -76.71487
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
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 protection7 GoodSome minor problems.
Last inspectionMarch 2023
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 geometry9: Superior to present desirable criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating62.9 US tons
Inventory rating36 US tons

Structure

Structure typeArch - Deck
MaterialConcrete
DeckConcrete, cast-in-place
Main spans2
Design loadH 20
Structure length86 ft (26.2 m)
Longest span41 ft (12.5 m)
Deck width83 ft (25.3 m)
Roadway width69 ft (21 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic20,280 (2009)
Projected traffic24,814 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 statusPossibly eligible for the National Register; requires further investigation
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$472,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Gwynn Oak Avenue over Gwynns Falls built?

It was built in 1900, making it 125 years old in 2025. It was reconstructed in 1937.

What condition is Gwynn Oak Avenue over Gwynns Falls 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 2023.

How much traffic does Gwynn Oak Avenue over Gwynns Falls carry?

About 20,280 vehicles per day (2009 count), of which roughly 8% are trucks.

How long is Gwynn Oak Avenue over Gwynns Falls?

The structure is 86 ft (26.2 m) long with a longest span of 41 ft (12.5 m) and a deck 83 ft wide.

Who owns Gwynn Oak Avenue over Gwynns Falls?

It is owned by the State Highway Agency.