US Bridges

Louisville Road over Middle Run

Fair

Carroll County, Maryland · 0.60 MI S of Deer Park RD · Structure no. 200000CL0337010

Built
1974
51 years old
Condition
Fair
inspected August 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
64 ft
1 main span
Daily traffic
988
2021 count
Owner
County
County Highway Agency

About this bridge

Louisville Road over Middle Run is a steel stringer/multi-beam or girder carrying Louisville Road over Middle Run in Carroll County, Maryland. It was built in 1974, so it is 51 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 988 vehicles a day, roughly 8% of them trucks, projected to reach 1,620 by 2041. The structure is 64 ft (19.6 m) long and 35 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesLouisville Road
CrossesMiddle Run
Location0.60 MI S of Deer Park RD
RouteCounty Highway 639
CountyCarroll County
StateMaryland
Coordinates39.46263, -76.90756
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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating110.1 US tons
Inventory rating61.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length64 ft (19.6 m)
Longest span60 ft (18.3 m)
Deck width35 ft (10.7 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic988 (2021)
Projected traffic1,620 by 2041
Trucks8%
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 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 Louisville Road over Middle Run built?

It was built in 1974, making it 51 years old in 2025.

What condition is Louisville Road over Middle 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 Louisville Road over Middle Run carry?

About 988 vehicles per day (2021 count), of which roughly 8% are trucks.

How long is Louisville Road over Middle Run?

The structure is 64 ft (19.6 m) long with a longest span of 60 ft (18.3 m) and a deck 35 ft wide.

Who owns Louisville Road over Middle Run?

It is owned by the County Highway Agency.