US Bridges

I-8 WB over Red Top Wash

Fair

Yuma County, Arizona · 20.7 MI E JCT US 95 · Structure no. 01327

Built
1967
58 years old
Condition
Fair
inspected January 2025
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
157 ft
2 main spans
Daily traffic
7,421
2021 count
Owner
State
State Highway Agency

About this bridge

I-8 WB over Red Top Wash is a prestressed concrete continuous stringer/multi-beam or girder carrying I-8 WB over Red Top Wash in Yuma County, Arizona. It was built in 1967, so it is 58 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 7,421 vehicles a day, roughly 26% of them trucks, projected to reach 7,431 by 2041. The structure is 157 ft (47.9 m) long and 41 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesI-8 WB
CrossesRed Top Wash
Location20.7 MI E JCT US 95
RouteInterstate 8
CountyYuma County
StateArizona
Coordinates32.6647, -114.2734
Functional classRural Principal Arterial - Interstate

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.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
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 rating56 US tons
Inventory rating43 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length157 ft (47.9 m)
Longest span76 ft (23.2 m)
Deck width41 ft (12.4 m)
Roadway width38 ft (11.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,421 (2021)
Projected traffic7,431 by 2041
Trucks26%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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 I-8 WB over Red Top Wash built?

It was built in 1967, making it 58 years old in 2025.

What condition is I-8 WB over Red Top Wash 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 I-8 WB over Red Top Wash carry?

About 7,421 vehicles per day (2021 count), of which roughly 26% are trucks.

How long is I-8 WB over Red Top Wash?

The structure is 157 ft (47.9 m) long with a longest span of 76 ft (23.2 m) and a deck 41 ft wide.

Who owns I-8 WB over Red Top Wash?

It is owned by the State Highway Agency.