US Bridges

Interstate 205 over California Aqueduct

Fair

Alameda County, California · 04-ALA-205-0.28 · Structure no. 33 0402

Built
1966
59 years old, rebuilt 1997
Condition
Fair
inspected January 2024
Type
Box Beam or Girders - Multiple
Concrete Continuous
Length
155 ft
2 main spans
Daily traffic
122,000
2020 count
Owner
State
State Highway Agency

About this bridge

Interstate 205 over California Aqueduct is a concrete continuous box beam or girders - multiple carrying Interstate 205 over California Aqueduct in Alameda County, California. It was built in 1966 and reconstructed in 1997, so it is 59 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 122,000 vehicles a day, roughly 12% of them trucks, projected to reach 169,412 by 2042. The structure is 155 ft (47.2 m) long and 128 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

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CarriesInterstate 205
CrossesCalifornia Aqueduct
Location04-ALA-205-0.28
RouteInterstate 205
CountyAlameda County
StateCalifornia
Coordinates37.74269, -121.56034
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.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
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 alignment8: Equal to present desirable criteria
Operating rating67.1 US tons
Inventory rating40.3 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length155 ft (47.2 m)
Longest span77 ft (23.5 m)
Deck width128 ft (39 m)
Roadway width123 ft (37.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic122,000 (2020)
Projected traffic169,412 by 2042
Trucks12%
Lanes on structure6
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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 205 over California Aqueduct built?

It was built in 1966, making it 59 years old in 2025. It was reconstructed in 1997.

What condition is Interstate 205 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 Interstate 205 over California Aqueduct carry?

About 122,000 vehicles per day (2020 count), of which roughly 12% are trucks.

How long is Interstate 205 over California Aqueduct?

The structure is 155 ft (47.2 m) long with a longest span of 77 ft (23.5 m) and a deck 128 ft wide.

Who owns Interstate 205 over California Aqueduct?

It is owned by the State Highway Agency.