US Bridges

Hunter Mill RD over Rocky Branch

Good

Fairfax County, Virginia · 01.20FR123 0.20TO672 · Structure no. 000000000031760

Built
1978
47 years old
Condition
Good
inspected December 2024
Type
Culvert
Concrete
Length
25 ft
3 main spans
Daily traffic
14,727
2022 count
Owner
State
State Highway Agency

About this bridge

Hunter Mill RD over Rocky Branch is a concrete culvert carrying Hunter Mill RD over Rocky Branch in Fairfax County, Virginia. It was built in 1978, so it is 47 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 14,727 vehicles a day, roughly 1% of them trucks, projected to reach 16,421 by 2042. The structure is 25 ft (7.6 m) long.

Location

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CarriesHunter Mill RD
CrossesRocky Branch
Location01.20FR123 0.20TO672
RouteCounty Highway 674
CountyFairfax County
StateVirginia
Coordinates38.89757, -77.30445
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
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Culvert7 GoodSome minor problems.
Last inspectionDecember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Waterway adequacy4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating99 US tons
Inventory rating65 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans3
Design loadHS 20
Structure length25 ft (7.6 m)
Longest span8 ft (2.4 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deck99 ft (30.2 m)

Traffic and service

Average daily traffic14,727 (2022)
Projected traffic16,421 by 2042
Trucks1%
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 Hunter Mill RD over Rocky Branch built?

It was built in 1978, making it 47 years old in 2025.

What condition is Hunter Mill RD over Rocky Branch 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 December 2024.

How much traffic does Hunter Mill RD over Rocky Branch carry?

About 14,727 vehicles per day (2022 count), of which roughly 1% are trucks.

How long is Hunter Mill RD over Rocky Branch?

The structure is 25 ft (7.6 m) long with a longest span of 8 ft (2.4 m).

Who owns Hunter Mill RD over Rocky Branch?

It is owned by the State Highway Agency.