US Bridges

Towlston Road over Rocky Run

Good

Fairfax County, Virginia · 00.15FR738/00.30TO0193 · Structure no. 000000000030148

Built
2014
11 years old
Condition
Good
inspected August 2024
Type
Slab
Concrete
Length
48 ft
1 main span
Daily traffic
893
2022 count
Owner
State
State Highway Agency

About this bridge

Towlston Road over Rocky Run is a concrete slab carrying Towlston Road over Rocky Run in Fairfax County, Virginia. It was built in 2014, so it is 11 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 893 vehicles a day, projected to reach 1,147 by 2042. The structure is 48 ft (14.5 m) long and 31 ft wide.

Location

Open in Google Maps
CarriesTowlston Road
CrossesRocky Run
Location00.15FR738/00.30TO0193
RouteCounty Highway 676
CountyFairfax County
StateVirginia
Coordinates38.97116, -77.2469
Functional classUrban 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.
Substructure8 Very GoodNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating71.8 US tons
Inventory rating55.4 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, precast panels
Main spans1
Design loadHL 93
Structure length48 ft (14.5 m)
Longest span45 ft (13.7 m)
Deck width31 ft (9.4 m)
Roadway width31 ft (9.4 m)
Vertical clearance over deck99 ft (30.2 m)

Traffic and service

Average daily traffic893 (2022)
Projected traffic1,147 by 2042
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
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—
NavigationNo navigation control on waterway

Frequently asked questions

When was Towlston Road over Rocky Run built?

It was built in 2014, making it 11 years old in 2025.

What condition is Towlston Road over Rocky Run 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 August 2024.

How much traffic does Towlston Road over Rocky Run carry?

About 893 vehicles per day (2022 count).

How long is Towlston Road over Rocky Run?

The structure is 48 ft (14.5 m) long with a longest span of 45 ft (13.7 m) and a deck 31 ft wide.

Who owns Towlston Road over Rocky Run?

It is owned by the State Highway Agency.