US Bridges

Interstate 680 over Lilac Drive

Fair

Contra Costa County, California · 04-CC-680-13.46-WLC · Structure no. 28 0166

Built
1960
65 years old, rebuilt 1994
Condition
Fair
inspected July 2024
Type
Box Beam or Girders - Multiple
Concrete Continuous
Length
149 ft
2 main spans
Daily traffic
195,300
2020 count
Owner
State
State Highway Agency

About this bridge

Interstate 680 over Lilac Drive is a concrete continuous box beam or girders - multiple carrying Interstate 680 over Lilac Drive in Contra Costa County, California. It was built in 1960 and reconstructed in 1994, so it is 65 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 195,300 vehicles a day, roughly 6% of them trucks, projected to reach 254,000 by 2041. The structure is 149 ft (45.3 m) long and 196 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesInterstate 680
CrossesLilac Drive
Location04-CC-680-13.46-WLC
RouteInterstate 680
CountyContra Costa County
StateCalifornia
Coordinates37.89017, -122.05868
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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.5 US tons
Inventory rating35.7 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length149 ft (45.3 m)
Longest span74 ft (22.6 m)
Deck width196 ft (59.7 m)
Roadway width191 ft (58.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic195,300 (2020)
Projected traffic254,000 by 2041
Trucks6%
Lanes on structure11
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Interstate 680 over Lilac Drive built?

It was built in 1960, making it 65 years old in 2025. It was reconstructed in 1994.

What condition is Interstate 680 over Lilac Drive 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 July 2024.

How much traffic does Interstate 680 over Lilac Drive carry?

About 195,300 vehicles per day (2020 count), of which roughly 6% are trucks.

How long is Interstate 680 over Lilac Drive?

The structure is 149 ft (45.3 m) long with a longest span of 74 ft (22.6 m) and a deck 196 ft wide.

Who owns Interstate 680 over Lilac Drive?

It is owned by the State Highway Agency.