US Bridges

Stringtown Road over Blackrock Run

Fair

Baltimore County, Maryland · 0.2 MI E of Falls RD · Structure no. 200000B-0454010

Built
1931
94 years old
Condition
Fair
inspected October 2024
Type
Tee Beam
Concrete
Length
38 ft
1 main span
Daily traffic
339
2024 count
Owner
County
County Highway Agency

About this bridge

Stringtown Road over Blackrock Run is a concrete tee beam carrying Stringtown Road over Blackrock Run in Baltimore County, Maryland. It was built in 1931, so it is 94 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 339 vehicles a day, roughly 5% of them trucks, projected to reach 425 by 2046. The structure is 38 ft (11.6 m) long and 31 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesStringtown Road
CrossesBlackrock Run
Location0.2 MI E of Falls RD
RouteCounty Highway 6769
CountyBaltimore County
StateMaryland
Coordinates39.54357, -76.73312
Functional classRural 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.
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 inspectionOctober 2024
Inspection intervalevery 12 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
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 rating57 US tons
Inventory rating34.5 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length38 ft (11.6 m)
Longest span29 ft (8.8 m)
Deck width31 ft (9.3 m)
Roadway width28 ft (8.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic339 (2024)
Projected traffic425 by 2046
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusEligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Stringtown Road over Blackrock Run built?

It was built in 1931, making it 94 years old in 2025.

What condition is Stringtown Road over Blackrock Run 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 October 2024.

How much traffic does Stringtown Road over Blackrock Run carry?

About 339 vehicles per day (2024 count), of which roughly 5% are trucks.

How long is Stringtown Road over Blackrock Run?

The structure is 38 ft (11.6 m) long with a longest span of 29 ft (8.8 m) and a deck 31 ft wide.

Who owns Stringtown Road over Blackrock Run?

It is owned by the County Highway Agency.