US Bridges

Interstate 10 over San Gorgonio Overflow

Fair

Riverside County, California · 08-RIV-010-R16.23-BAN · Structure no. 56 0351

Built
1940
85 years old, rebuilt 1970
Condition
Fair
inspected November 2023
Type
Slab
Concrete Continuous
Length
48 ft
4 main spans
Daily traffic
120,000
2016 count
Owner
State
State Highway Agency

About this bridge

Interstate 10 over San Gorgonio Overflow is a concrete continuous slab carrying Interstate 10 over San Gorgonio Overflow in Riverside County, California. It was built in 1940 and reconstructed in 1970, so it is 85 years old, older 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 120,000 vehicles a day, roughly 18% of them trucks, projected to reach 176,000 by 2040. The structure is 48 ft (14.5 m) long and 153 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesInterstate 10
CrossesSan Gorgonio Overflow
Location08-RIV-010-R16.23-BAN
RouteInterstate 10
CountyRiverside County
StateCalifornia
Coordinates33.93131, -116.82731
Functional classUrban 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.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionNovember 2023
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 alignment8: Equal to present desirable criteria
Operating rating110 US tons
Inventory rating89.9 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length48 ft (14.5 m)
Longest span24 ft (7.2 m)
Deck width153 ft (46.5 m)
Roadway width148 ft (45.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic120,000 (2016)
Projected traffic176,000 by 2040
Trucks18%
Lanes on structure8
Traffic directionTwo-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 10 over San Gorgonio Overflow built?

It was built in 1940, making it 85 years old in 2025. It was reconstructed in 1970.

What condition is Interstate 10 over San Gorgonio Overflow 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 November 2023.

How much traffic does Interstate 10 over San Gorgonio Overflow carry?

About 120,000 vehicles per day (2016 count), of which roughly 18% are trucks.

How long is Interstate 10 over San Gorgonio Overflow?

The structure is 48 ft (14.5 m) long with a longest span of 24 ft (7.2 m) and a deck 153 ft wide.

Who owns Interstate 10 over San Gorgonio Overflow?

It is owned by the State Highway Agency.