US Bridges

Allder School Road over South Fork Catoctin Ck.

Good

Loudoun County, Virginia · 00.10FR716/01.10TO719 · Structure no. 000000000030989

Built
2018
7 years old
Condition
Good
inspected May 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
50 ft
1 main span
Daily traffic
313
2014 count
Owner
State
State Highway Agency

About this bridge

Allder School Road over South Fork Catoctin Ck. is a prestressed concrete stringer/multi-beam or girder carrying Allder School Road over South Fork Catoctin Ck. in Loudoun County, Virginia. It was built in 2018, so it is 7 years old, younger than the Virginia average of 50.7 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 313 vehicles a day, roughly 2% of them trucks, projected to reach 459 by 2042. The structure is 50 ft (15.2 m) long and 34 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

CarriesAllder School Road
CrossesSouth Fork Catoctin Ck.
Location00.10FR716/01.10TO719
RouteCounty Highway 711
Coordinates39.15949, -77.75008
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating80.2 US tons
Inventory rating61.9 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length50 ft (15.2 m)
Longest span43 ft (13.1 m)
Deck width34 ft (10.4 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic313 (2014)
Projected traffic459 by 2042
Trucks2%
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

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost$2.5 million
NavigationNo navigation control on waterway

Frequently asked questions

When was Allder School Road over South Fork Catoctin Ck. built?

It was built in 2018, making it 7 years old in 2025.

What condition is Allder School Road over South Fork Catoctin Ck. 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 May 2024.

How much traffic does Allder School Road over South Fork Catoctin Ck. carry?

About 313 vehicles per day (2014 count), of which roughly 2% are trucks.

How long is Allder School Road over South Fork Catoctin Ck.?

The structure is 50 ft (15.2 m) long with a longest span of 43 ft (13.1 m) and a deck 34 ft wide.

Who owns Allder School Road over South Fork Catoctin Ck.?

It is owned by the State Highway Agency.