US Bridges

Royal Oak RD over Drainage Ditch

Fair

Maricopa County, Arizona · At 99th Avenue Median · Structure no. 09669

Built
1972
53 years old
Condition
Fair
inspected December 2022
Type
Culvert
Concrete Continuous
Length
25 ft
2 main spans
Daily traffic
3,000
2022 count
Owner
County
County Highway Agency

About this bridge

Royal Oak RD over Drainage Ditch is a concrete continuous culvert carrying Royal Oak RD over Drainage Ditch in Maricopa County, Arizona. It was built in 1972, so it is 53 years old, older than the Arizona average of 47.8 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 3,000 vehicles a day, roughly 2% of them trucks, projected to reach 3,010 by 2042. The structure is 25 ft (7.6 m) long and 49 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesRoyal Oak RD
CrossesDrainage Ditch
LocationAt 99th Avenue Median
RouteCounty Highway 0
CountyMaricopa County
StateArizona
Coordinates33.6007, -112.2707
Functional classUrban Local

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 inspectionDecember 2022
Inspection intervalevery 36 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating63.1 US tons
Inventory rating37 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadHS 20
Structure length25 ft (7.6 m)
Longest span12 ft (3.7 m)
Deck width49 ft (14.8 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,000 (2022)
Projected traffic3,010 by 2042
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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 Royal Oak RD over Drainage Ditch built?

It was built in 1972, making it 53 years old in 2025.

What condition is Royal Oak RD over Drainage Ditch 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 December 2022.

How much traffic does Royal Oak RD over Drainage Ditch carry?

About 3,000 vehicles per day (2022 count), of which roughly 2% are trucks.

How long is Royal Oak RD over Drainage Ditch?

The structure is 25 ft (7.6 m) long with a longest span of 12 ft (3.7 m) and a deck 49 ft wide.

Who owns Royal Oak RD over Drainage Ditch?

It is owned by the County Highway Agency.