US Bridges

Carquinez Scenic D over Eckley Slide

Fair

Contra Costa County, California · 2.1 MI E I-80 in Crockett · Structure no. 28C0043

Built
1919
106 years old
Condition
Fair
inspected September 2024
Type
Slab
Concrete Continuous
Length
31 ft
2 main spans
Daily traffic
470
2014 count
Owner
County
County Highway Agency

About this bridge

Carquinez Scenic D over Eckley Slide is a concrete continuous slab carrying Carquinez Scenic D over Eckley Slide in Contra Costa County, California. It was built in 1919, so it is 106 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 6 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 470 vehicles a day, roughly 6% of them trucks, projected to reach 1,073 by 2044. The structure is 31 ft (9.4 m) long and 23 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

Open in Google Maps
CarriesCarquinez Scenic D
CrossesEckley Slide
Location2.1 MI E I-80 in Crockett
RouteCounty Highway 0
CountyContra Costa County
StateCalifornia
Coordinates38.04967, -122.19857
Functional classRural Major Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 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 geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating34.6 US tons
Inventory rating20.7 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadH 10
Structure length31 ft (9.4 m)
Longest span15 ft (4.6 m)
Deck width23 ft (7.1 m)
Roadway width21 ft (6.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic470 (2014)
Projected traffic1,073 by 2044
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed9.9 mi (16 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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 Carquinez Scenic D over Eckley Slide built?

It was built in 1919, making it 106 years old in 2025.

What condition is Carquinez Scenic D over Eckley Slide 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 September 2024.

How much traffic does Carquinez Scenic D over Eckley Slide carry?

About 470 vehicles per day (2014 count), of which roughly 6% are trucks.

How long is Carquinez Scenic D over Eckley Slide?

The structure is 31 ft (9.4 m) long with a longest span of 15 ft (4.6 m) and a deck 23 ft wide.

Who owns Carquinez Scenic D over Eckley Slide?

It is owned by the County Highway Agency.