US Bridges

SR 74 over Agua Fria River

Fair

Maricopa County, Arizona · 9.8 MI W JCT I 17 · Structure no. 01620

Built
1972
53 years old, rebuilt 1979
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
408 ft
5 main spans
Daily traffic
6,675
2021 count
Owner
State
State Highway Agency

About this bridge

SR 74 over Agua Fria River is a prestressed concrete stringer/multi-beam or girder carrying SR 74 over Agua Fria River in Maricopa County, Arizona. It was built in 1972 and reconstructed in 1979, 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 6,675 vehicles a day, roughly 12% of them trucks, projected to reach 6,685 by 2041. The structure is 408 ft (124.4 m) long and 47 ft wide. If it were closed, the detour would be 60.3 mi (97 km).

Location

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CarriesSR 74
CrossesAgua Fria River
Location9.8 MI W JCT I 17
RouteState Highway 74
CountyMaricopa County
StateArizona
Coordinates33.8278, -112.2791
Functional classRural Principal Arterial - Other

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
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 rating92 US tons
Inventory rating36 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20
Structure length408 ft (124.4 m)
Longest span81 ft (24.7 m)
Deck width47 ft (14.2 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,675 (2021)
Projected traffic6,685 by 2041
Trucks12%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed60.3 mi (97 km)
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 SR 74 over Agua Fria River built?

It was built in 1972, making it 53 years old in 2025. It was reconstructed in 1979.

What condition is SR 74 over Agua Fria River 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 May 2023.

How much traffic does SR 74 over Agua Fria River carry?

About 6,675 vehicles per day (2021 count), of which roughly 12% are trucks.

How long is SR 74 over Agua Fria River?

The structure is 408 ft (124.4 m) long with a longest span of 81 ft (24.7 m) and a deck 47 ft wide.

Who owns SR 74 over Agua Fria River?

It is owned by the State Highway Agency.