US Bridges

Interstate 15 SB over Mayhew Wash

Fair

Riverside County, California · 08-RIV-015-31.97 · Structure no. 56 0674L

Built
1979
46 years old
Condition
Fair
inspected January 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
147 ft
1 main span
Daily traffic
65,000
2021 count
Owner
State
State Highway Agency

About this bridge

Interstate 15 SB over Mayhew Wash is a prestressed concrete box beam or girders - multiple carrying Interstate 15 SB over Mayhew Wash in Riverside County, California. It was built in 1979, so it is 46 years old, younger than the California average of 54.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 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 65,000 vehicles a day, roughly 13% of them trucks, projected to reach 102,884 by 2042. The structure is 147 ft (44.9 m) long and 69 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesInterstate 15 SB
CrossesMayhew Wash
Location08-RIV-015-31.97
RouteInterstate 15
CountyRiverside County
StateCalifornia
Coordinates33.7625, -117.47306
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
Deck7 GoodSome minor problems.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJanuary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating79.3 US tons
Inventory rating45.3 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length147 ft (44.9 m)
Longest span147 ft (44.9 m)
Deck width69 ft (21 m)
Roadway width65 ft (19.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic65,000 (2021)
Projected traffic102,884 by 2042
Trucks13%
Lanes on structure3
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 Interstate 15 SB over Mayhew Wash built?

It was built in 1979, making it 46 years old in 2025.

What condition is Interstate 15 SB over Mayhew 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 2024.

How much traffic does Interstate 15 SB over Mayhew Wash carry?

About 65,000 vehicles per day (2021 count), of which roughly 13% are trucks.

How long is Interstate 15 SB over Mayhew Wash?

The structure is 147 ft (44.9 m) long with a longest span of 147 ft (44.9 m) and a deck 69 ft wide.

Who owns Interstate 15 SB over Mayhew Wash?

It is owned by the State Highway Agency.