US Bridges

Benson Mill Road over Blackrock Run

Good

Baltimore County, Maryland · 0.3 MI E of Md 25 · Structure no. 200000B-0070010

Built
2001
24 years old
Condition
Good
inspected November 2023
Type
Arch - Deck
Concrete
Length
36 ft
1 main span
Daily traffic
4,229
2023 count
Owner
County
County Highway Agency

About this bridge

Benson Mill Road over Blackrock Run is a concrete arch - deck carrying Benson Mill Road over Blackrock Run in Baltimore County, Maryland. It was built in 2001, so it is 24 years old, younger than the Maryland average of 52.6 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 4,229 vehicles a day, roughly 5% of them trucks, projected to reach 5,264 by 2045. The structure is 36 ft (11 m) long and 30 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

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CarriesBenson Mill Road
CrossesBlackrock Run
Location0.3 MI E of Md 25
RouteCounty Highway 153
CountyBaltimore County
StateMaryland
Coordinates39.56906, -76.74442
Functional classRural Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating110.1 US tons
Inventory rating75.9 US tons

Structure

Structure typeArch - Deck
MaterialConcrete
DeckNot applicable
Main spans1
Design loadHS 20
Structure length36 ft (11 m)
Longest span36 ft (11 m)
Deck width30 ft (9.2 m)
Roadway width27 ft (8.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,229 (2023)
Projected traffic5,264 by 2045
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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 Benson Mill Road over Blackrock Run built?

It was built in 2001, making it 24 years old in 2025.

What condition is Benson Mill Road over Blackrock Run in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in November 2023.

How much traffic does Benson Mill Road over Blackrock Run carry?

About 4,229 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is Benson Mill Road over Blackrock Run?

The structure is 36 ft (11 m) long with a longest span of 36 ft (11 m) and a deck 30 ft wide.

Who owns Benson Mill Road over Blackrock Run?

It is owned by the County Highway Agency.