US Bridges

Fair Lakes Parkway over Tributary Big Rocky Run

Fair

Fairfax County, Virginia · 00.08FR7100/00.20TO7701 · Structure no. 000000000007098

Built
1986
39 years old
Condition
Fair
inspected February 2024
Type
Culvert
Concrete
Length
30 ft
3 main spans
Daily traffic
20,618
2022 count
Owner
State
State Highway Agency

About this bridge

Fair Lakes Parkway over Tributary Big Rocky Run is a concrete culvert carrying Fair Lakes Parkway over Tributary Big Rocky Run in Fairfax County, Virginia. It was built in 1986, so it is 39 years old, younger 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 20,618 vehicles a day, roughly 1% of them trucks, projected to reach 22,989 by 2042. The structure is 30 ft (9.1 m) long. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesFair Lakes Parkway
CrossesTributary Big Rocky Run
Location00.08FR7100/00.20TO7701
RouteCounty Highway 7700
CountyFairfax County
StateVirginia
Coordinates38.86247, -77.38097
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
Channel and channel protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating99 US tons
Inventory rating98.9 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans3
Design loadHS 20
Structure length30 ft (9.1 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 traffic20,618 (2022)
Projected traffic22,989 by 2042
Trucks1%
Lanes on structure6
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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$150 million
NavigationNo navigation control on waterway

Frequently asked questions

When was Fair Lakes Parkway over Tributary Big Rocky Run built?

It was built in 1986, making it 39 years old in 2025.

What condition is Fair Lakes Parkway over Tributary Big Rocky 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 February 2024.

How much traffic does Fair Lakes Parkway over Tributary Big Rocky Run carry?

About 20,618 vehicles per day (2022 count), of which roughly 1% are trucks.

How long is Fair Lakes Parkway over Tributary Big Rocky Run?

The structure is 30 ft (9.1 m) long with a longest span of 10 ft (3 m).

Who owns Fair Lakes Parkway over Tributary Big Rocky Run?

It is owned by the State Highway Agency.