US Bridges

WB Diaah over Hunter Mill Road

Poor

Fairfax County, Virginia · 8.0 Miles from Dulles Air · Structure no. 2100035P0000000

Built
1961
64 years old
Condition
Poor
inspected February 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
119 ft
3 main spans
Daily traffic
22,000
2024 count
Owner
Federal
Metropolitan Washington Airports Service

About this bridge

WB Diaah over Hunter Mill Road is a steel stringer/multi-beam or girder carrying WB Diaah over Hunter Mill Road in Fairfax County, Virginia. It was built in 1961, so it is 64 years old, older than the Virginia average of 50.7 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 22,000 vehicles a day, projected to reach 26,400 by 2044. The structure is 119 ft (36.4 m) long and 44 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesWB Diaah
CrossesHunter Mill Road
Location8.0 Miles from Dulles Air
CountyFairfax County
StateVirginia
Coordinates38.94793, -77.31195
Functional classUrban Principal Arterial - Other Freeway or Expressway

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating73 US tons
Inventory rating43 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length119 ft (36.4 m)
Longest span52 ft (15.8 m)
Deck width44 ft (13.5 m)
Roadway width39 ft (11.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic22,000 (2024)
Projected traffic26,400 by 2044
Trucks—
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.2 mi (2 km)
TollOn a toll road
National Highway SystemYes

Ownership and planned work

OwnerMetropolitan Washington Airports Service
Maintained byMetropolitan Washington Airports Service
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost$377,000 (2021 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was WB Diaah over Hunter Mill Road built?

It was built in 1961, making it 64 years old in 2025.

What condition is WB Diaah over Hunter Mill Road in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in February 2024.

How much traffic does WB Diaah over Hunter Mill Road carry?

About 22,000 vehicles per day (2024 count).

How long is WB Diaah over Hunter Mill Road?

The structure is 119 ft (36.4 m) long with a longest span of 52 ft (15.8 m) and a deck 44 ft wide.

Who owns WB Diaah over Hunter Mill Road?

It is owned by the Metropolitan Washington Airports Service.