US Bridges

Main Street over California Aqueduct

Fair

San Bernardino County, California · 0.7 MI E of RTE 15 · Structure no. 54C0184

Built
1970
55 years old
Condition
Fair
inspected January 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
125 ft
2 main spans
Daily traffic
27,667
2014 count
Owner
Local
Other Local Agency

About this bridge

Main Street over California Aqueduct is a prestressed concrete stringer/multi-beam or girder carrying Main Street over California Aqueduct in San Bernardino County, California. It was built in 1970, so it is 55 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 27,667 vehicles a day, roughly 3% of them trucks, projected to reach 38,529 by 2044. The structure is 125 ft (38.1 m) long and 63 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesMain Street
CrossesCalifornia Aqueduct
Location0.7 MI E of RTE 15
RouteCity Street 0
CountySan Bernardino County
StateCalifornia
Coordinates34.42661, -117.36932
Functional classUrban Other Principal Arterial

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 protection9 ExcellentNo 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 geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating38.6 US tons
Inventory rating21.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length125 ft (38.1 m)
Longest span61 ft (18.6 m)
Deck width63 ft (19.3 m)
Roadway width61 ft (18.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic27,667 (2014)
Projected traffic38,529 by 2044
Trucks3%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerOther Local Agency
Maintained byCity or Municipal 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 Main Street over California Aqueduct built?

It was built in 1970, making it 55 years old in 2025.

What condition is Main Street over California Aqueduct 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 Main Street over California Aqueduct carry?

About 27,667 vehicles per day (2014 count), of which roughly 3% are trucks.

How long is Main Street over California Aqueduct?

The structure is 125 ft (38.1 m) long with a longest span of 61 ft (18.6 m) and a deck 63 ft wide.

Who owns Main Street over California Aqueduct?

It is owned by the Other Local Agency and maintained by the City or Municipal Highway Agency.