US Bridges

Mantua Mill Road over Western Run

Fair

Baltimore County, Maryland · 0.1 MI S Green RD · Structure no. 200000B-0114010

Built
1981
44 years old
Condition
Fair
inspected December 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
38 ft
1 main span
Daily traffic
743
2021 count
Owner
County
County Highway Agency

About this bridge

Mantua Mill Road over Western Run is a prestressed concrete box beam or girders - multiple carrying Mantua Mill Road over Western Run in Baltimore County, Maryland. It was built in 1981, so it is 44 years old, younger 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.

It carries about 743 vehicles a day, roughly 5% of them trucks, projected to reach 925 by 2041. The structure is 38 ft (11.6 m) long and 31 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesMantua Mill Road
CrossesWestern Run
Location0.1 MI S Green RD
RouteCounty Highway 189
CountyBaltimore County
StateMaryland
Coordinates39.50703, -76.75069
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating74.5 US tons
Inventory rating44.5 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckNot applicable
Main spans1
Design loadHS 20
Structure length38 ft (11.6 m)
Longest span36 ft (11 m)
Deck width31 ft (9.6 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic743 (2021)
Projected traffic925 by 2041
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 Mantua Mill Road over Western Run built?

It was built in 1981, making it 44 years old in 2025.

What condition is Mantua Mill Road over Western 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 December 2023.

How much traffic does Mantua Mill Road over Western Run carry?

About 743 vehicles per day (2021 count), of which roughly 5% are trucks.

How long is Mantua Mill Road over Western Run?

The structure is 38 ft (11.6 m) long with a longest span of 36 ft (11 m) and a deck 31 ft wide.

Who owns Mantua Mill Road over Western Run?

It is owned by the County Highway Agency.