US Bridges

Cook ST-10 EB on over Unimproved

Fair

Riverside County, California · 08-RIV-010-47.00-PDST · Structure no. 56 0788S

Built
1998
27 years old
Condition
Fair
inspected October 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete Continuous
Length
346 ft
4 main spans
Daily traffic
4,500
2014 count
Owner
State
State Highway Agency

About this bridge

Cook ST-10 EB on over Unimproved is a prestressed concrete continuous box beam or girders - multiple carrying Cook ST-10 EB on over Unimproved in Riverside County, California. It was built in 1998, so it is 27 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 4,500 vehicles a day, roughly 32% of them trucks, projected to reach 7,651 by 2040. The structure is 346 ft (105.4 m) long and 35 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesCook ST-10 EB on
CrossesUnimproved
Location08-RIV-010-47.00-PDST
RouteInterstate 10
CountyRiverside County
StateCalifornia
Coordinates33.78558, -116.35478
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.6 US tons
Inventory rating35.7 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20 + Mod
Structure length346 ft (105.4 m)
Longest span120 ft (36.6 m)
Deck width35 ft (10.8 m)
Roadway width32 ft (9.7 m)
Vertical clearance over deck20 ft (6.1 m)

Traffic and service

Average daily traffic4,500 (2014)
Projected traffic7,651 by 2040
Trucks32%
Lanes on structure1
Traffic directionOne-way traffic
CarriesHighway
CrossesOther
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Cook ST-10 EB on over Unimproved built?

It was built in 1998, making it 27 years old in 2025.

What condition is Cook ST-10 EB on over Unimproved 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 October 2023.

How much traffic does Cook ST-10 EB on over Unimproved carry?

About 4,500 vehicles per day (2014 count), of which roughly 32% are trucks.

How long is Cook ST-10 EB on over Unimproved?

The structure is 346 ft (105.4 m) long with a longest span of 120 ft (36.6 m) and a deck 35 ft wide.

Who owns Cook ST-10 EB on over Unimproved?

It is owned by the State Highway Agency.