US Bridges

Signal Butte RD over Drainage Ditch

Fair

Maricopa County, Arizona · N/ Broadway RD · Structure no. 08982

Built
1987
38 years old, rebuilt 1998
Condition
Fair
inspected January 2025
Type
Culvert
Concrete Continuous
Length
21 ft
2 main spans
Daily traffic
12,973
2023 count
Owner
County
County Highway Agency

About this bridge

Signal Butte RD over Drainage Ditch is a concrete continuous culvert carrying Signal Butte RD over Drainage Ditch in Maricopa County, Arizona. It was built in 1987 and reconstructed in 1998, so it is 38 years old, younger 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 12,973 vehicles a day, roughly 10% of them trucks, projected to reach 12,983 by 2042. The structure is 21 ft (6.4 m) long and 88 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesSignal Butte RD
CrossesDrainage Ditch
LocationN/ Broadway RD
RouteCounty Highway 0
CountyMaricopa County
StateArizona
Coordinates33.40804, -111.59806
Functional classUrban Minor Arterial

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 inspectionJanuary 2025
Inspection intervalevery 36 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.4 US tons
Inventory rating35.5 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 width88 ft (26.7 m)
Roadway width76 ft (23.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic12,973 (2023)
Projected traffic12,983 by 2042
Trucks10%
Lanes on structure6
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 Signal Butte RD over Drainage Ditch built?

It was built in 1987, making it 38 years old in 2025. It was reconstructed in 1998.

What condition is Signal Butte 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 January 2025.

How much traffic does Signal Butte RD over Drainage Ditch carry?

About 12,973 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is Signal Butte 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 88 ft wide.

Who owns Signal Butte RD over Drainage Ditch?

It is owned by the County Highway Agency.