US Bridges

Thornton Road over Tributary to Roland Run

FairPosted for load

Baltimore County, Maryland · 0.6 MI N of Joppa RD · Structure no. 200000B-0086010

Built
1923
102 years old, rebuilt 1963
Condition
Fair
inspected August 2023
Type
Tee Beam
Concrete
Length
36 ft
1 main span
Daily traffic
8,249
2023 count
Owner
County
County Highway Agency

About this bridge

Thornton Road over Tributary to Roland Run is a concrete tee beam carrying Thornton Road over Tributary to Roland Run in Baltimore County, Maryland. It was built in 1923 and reconstructed in 1963, so it is 102 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. Its operating status is: posted for load restriction.

It carries about 8,249 vehicles a day, roughly 5% of them trucks, projected to reach 10,292 by 2045. The structure is 36 ft (11 m) long and 53 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesThornton Road
CrossesTributary to Roland Run
Location0.6 MI N of Joppa RD
RouteCounty Highway 1117
CountyBaltimore County
StateMaryland
Coordinates39.41723, -76.64755
Functional classUrban Collector

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 inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourCountermeasures installed to correct a previously existing problem
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 rating57.5 US tons
Inventory rating34.5 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length36 ft (11 m)
Longest span31 ft (9.4 m)
Deck width53 ft (16.2 m)
Roadway width42 ft (12.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,249 (2023)
Projected traffic10,292 by 2045
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed3.1 mi (5 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 Thornton Road over Tributary to Roland Run built?

It was built in 1923, making it 102 years old in 2025. It was reconstructed in 1963.

What condition is Thornton Road over Tributary to Roland 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 August 2023.

How much traffic does Thornton Road over Tributary to Roland Run carry?

About 8,249 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is Thornton Road over Tributary to Roland Run?

The structure is 36 ft (11 m) long with a longest span of 31 ft (9.4 m) and a deck 53 ft wide.

Who owns Thornton Road over Tributary to Roland Run?

It is owned by the County Highway Agency.