US Bridges

Middle Ridge Drive over Big Rocky Run

Fair

Fairfax County, Virginia · 00.15FR4820/00.04TO4980 · Structure no. 000000000007031

Built
1932
93 years old
Condition
Fair
inspected September 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
53 ft
1 main span
Daily traffic
1,095
2022 count
Owner
State
State Highway Agency

About this bridge

Middle Ridge Drive over Big Rocky Run is a prestressed concrete box beam or girders - multiple carrying Middle Ridge Drive over Big Rocky Run in Fairfax County, Virginia. It was built in 1932, so it is 93 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 1,095 vehicles a day, projected to reach 1,221 by 2042. The structure is 53 ft (16.2 m) long and 55 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesMiddle Ridge Drive
CrossesBig Rocky Run
Location00.15FR4820/00.04TO4980
RouteCounty Highway 4851
CountyFairfax County
StateVirginia
Coordinates38.86852, -77.39325
Functional classUrban Collector

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry8: Equal to present desirable criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating92 US tons
Inventory rating67 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length53 ft (16.2 m)
Longest span51 ft (15.5 m)
Deck width55 ft (16.7 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,095 (2022)
Projected traffic1,221 by 2042
Trucks0%
Lanes on structure2
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$175 million
NavigationNo navigation control on waterway

Frequently asked questions

When was Middle Ridge Drive over Big Rocky Run built?

It was built in 1932, making it 93 years old in 2025.

What condition is Middle Ridge Drive over 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 September 2024.

How much traffic does Middle Ridge Drive over Big Rocky Run carry?

About 1,095 vehicles per day (2022 count).

How long is Middle Ridge Drive over Big Rocky Run?

The structure is 53 ft (16.2 m) long with a longest span of 51 ft (15.5 m) and a deck 55 ft wide.

Who owns Middle Ridge Drive over Big Rocky Run?

It is owned by the State Highway Agency.