US Bridges

Royal Ridge RD over Drainage Ditch

Good

Maricopa County, Arizona · At 99th Avenue Median · Structure no. 09670

Built
1972
53 years old
Condition
Good
inspected December 2022
Type
Culvert
Concrete Continuous
Length
21 ft
2 main spans
Daily traffic
1,500
2022 count
Owner
County
County Highway Agency

About this bridge

Royal Ridge RD over Drainage Ditch is a concrete continuous culvert carrying Royal Ridge 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 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 1,500 vehicles a day, roughly 5% of them trucks, projected to reach 1,510 by 2042. The structure is 21 ft (6.4 m) long and 44 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesRoyal Ridge RD
CrossesDrainage Ditch
LocationAt 99th Avenue Median
RouteCounty Highway 0
CountyMaricopa County
StateArizona
Coordinates33.60741, -112.26833
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 protection7 GoodSome minor problems.
Culvert7 GoodSome minor problems.
Last inspectionDecember 2022
Inspection intervalevery 36 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating61 US tons
Inventory rating36 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadHS 20
Structure length21 ft (6.4 m)
Longest span10 ft (3 m)
Deck width44 ft (13.4 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,500 (2022)
Projected traffic1,510 by 2042
Trucks5%
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 Ridge RD over Drainage Ditch built?

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

What condition is Royal Ridge RD over Drainage Ditch 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 2022.

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

About 1,500 vehicles per day (2022 count), of which roughly 5% are trucks.

How long is Royal Ridge RD over Drainage Ditch?

The structure is 21 ft (6.4 m) long with a longest span of 10 ft (3 m) and a deck 44 ft wide.

Who owns Royal Ridge RD over Drainage Ditch?

It is owned by the County Highway Agency.