US Bridges

Loudon Avenue over Trib to Deep Run

Fair

Howard County, Maryland · 1.5 MI East of RTE 1 · Structure no. 200000HO0018030

Built
2004
21 years old
Condition
Fair
inspected November 2024
Type
Culvert
Steel
Length
22 ft
Daily traffic
620
2024 count
Owner
County
County Highway Agency

About this bridge

Loudon Avenue over Trib to Deep Run is a steel culvert carrying Loudon Avenue over Trib to Deep Run in Howard County, Maryland. It was built in 2004, so it is 21 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 620 vehicles a day, roughly 5% of them trucks, projected to reach 760 by 2044. The structure is 22 ft (6.8 m) long. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesLoudon Avenue
CrossesTrib to Deep Run
Location1.5 MI East of RTE 1
RouteCounty Highway 143
CountyHoward County
StateMaryland
Coordinates39.19284, -76.73086
Functional classUrban 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
Channel and channel protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: 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 rating87.5 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans0
Design loadHS 20
Structure length22 ft (6.8 m)
Longest span10 ft (3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic620 (2024)
Projected traffic760 by 2044
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
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 Loudon Avenue over Trib to Deep Run built?

It was built in 2004, making it 21 years old in 2025.

What condition is Loudon Avenue over Trib to Deep 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 November 2024.

How much traffic does Loudon Avenue over Trib to Deep Run carry?

About 620 vehicles per day (2024 count), of which roughly 5% are trucks.

How long is Loudon Avenue over Trib to Deep Run?

The structure is 22 ft (6.8 m) long with a longest span of 10 ft (3 m).

Who owns Loudon Avenue over Trib to Deep Run?

It is owned by the County Highway Agency.