US Bridges

Lorton Road 642 over Pohick Creek

Good

Fairfax County, Virginia · 00.20FR1820/00.01TO1235 · Structure no. 000000000027663

Built
2005
20 years old
Condition
Good
inspected July 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
125 ft
1 main span
Daily traffic
20,514
2022 count
Owner
State
State Highway Agency

About this bridge

Lorton Road 642 over Pohick Creek is a steel stringer/multi-beam or girder carrying Lorton Road 642 over Pohick Creek in Fairfax County, Virginia. It was built in 2005, so it is 20 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 20,514 vehicles a day, roughly 1% of them trucks, projected to reach 29,950 by 2045. The structure is 125 ft (38.1 m) long and 114 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesLorton Road 642
CrossesPohick Creek
Location00.20FR1820/00.01TO1235
RouteCounty Highway 642
CountyFairfax County
StateVirginia
Coordinates38.70395, -77.21416
Functional classUrban Minor Arterial

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 inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment9: Superior to present desirable criteria
Operating rating48.9 US tons
Inventory rating37.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length125 ft (38.1 m)
Longest span123 ft (37.5 m)
Deck width114 ft (34.6 m)
Roadway width94 ft (28.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic20,514 (2022)
Projected traffic29,950 by 2045
Trucks1%
Lanes on structure6
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$3 million
NavigationNot applicable (no waterway)

Frequently asked questions

When was Lorton Road 642 over Pohick Creek built?

It was built in 2005, making it 20 years old in 2025.

What condition is Lorton Road 642 over Pohick Creek 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 July 2023.

How much traffic does Lorton Road 642 over Pohick Creek carry?

About 20,514 vehicles per day (2022 count), of which roughly 1% are trucks.

How long is Lorton Road 642 over Pohick Creek?

The structure is 125 ft (38.1 m) long with a longest span of 123 ft (37.5 m) and a deck 114 ft wide.

Who owns Lorton Road 642 over Pohick Creek?

It is owned by the State Highway Agency.