US Bridges

John S. Mosby HWY over Lenah Run

Fair

Loudoun County, Virginia · .20MI FR 600/.70MI to 616 · Structure no. 000000000011127

Built
1935
90 years old
Condition
Fair
inspected March 2023
Type
Slab
Concrete
Length
23 ft
1 main span
Daily traffic
19,730
2022 count
Owner
State
State Highway Agency

About this bridge

John S. Mosby HWY over Lenah Run is a concrete slab carrying John S. Mosby HWY over Lenah Run in Loudoun County, Virginia. It was built in 1935, so it is 90 years old, older than the Virginia average of 50.7 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 19,730 vehicles a day, roughly 1% of them trucks, projected to reach 21,999 by 2045. The structure is 23 ft (6.9 m) long and 42 ft wide. If it were closed, the detour would be 39.8 mi (64 km).

Location

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CarriesJohn S. Mosby HWY
CrossesLenah Run
Location.20MI FR 600/.70MI to 616
RouteU.S. Route 50
CountyLoudoun County
StateVirginia
Coordinates38.95181, -77.57691
Functional classUrban Minor Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMarch 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 adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating48 US tons
Inventory rating37 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length23 ft (6.9 m)
Longest span20 ft (6.2 m)
Deck width42 ft (12.8 m)
Roadway width39 ft (11.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic19,730 (2022)
Projected traffic21,999 by 2045
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed39.8 mi (64 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$560 million
NavigationNo navigation control on waterway

Frequently asked questions

When was John S. Mosby HWY over Lenah Run built?

It was built in 1935, making it 90 years old in 2025.

What condition is John S. Mosby HWY over Lenah 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 March 2023.

How much traffic does John S. Mosby HWY over Lenah Run carry?

About 19,730 vehicles per day (2022 count), of which roughly 1% are trucks.

How long is John S. Mosby HWY over Lenah Run?

The structure is 23 ft (6.9 m) long with a longest span of 20 ft (6.2 m) and a deck 42 ft wide.

Who owns John S. Mosby HWY over Lenah Run?

It is owned by the State Highway Agency.