US Bridges

Blythe Drive over Contra Costa Canal

Good

Contra Costa County, California · 0.03 MI S James Donlon Bl · Structure no. 28C0506

Built
1989
36 years old
Condition
Good
inspected January 2023
Type
Slab
Prestressed Concrete
Length
35 ft
1 main span
Daily traffic
1,000
2020 count
Owner
City
City or Municipal Highway Agency

About this bridge

Blythe Drive over Contra Costa Canal is a prestressed concrete slab carrying Blythe Drive over Contra Costa Canal in Contra Costa County, California. It was built in 1989, so it is 36 years old, younger than the California average of 54.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 1,000 vehicles a day, roughly 5% of them trucks, projected to reach 1,224 by 2041. The structure is 35 ft (10.8 m) long and 40 ft wide.

Location

Open in Google Maps
CarriesBlythe Drive
CrossesContra Costa Canal
Location0.03 MI S James Donlon Bl
RouteCity Street 0
CountyContra Costa County
StateCalifornia
Coordinates37.97982, -121.82046
Functional classUrban Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJanuary 2023
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.6 US tons
Inventory rating35.7 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length35 ft (10.8 m)
Longest span35 ft (10.8 m)
Deck width40 ft (12.2 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,000 (2020)
Projected traffic1,224 by 2041
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed—
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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 Blythe Drive over Contra Costa Canal built?

It was built in 1989, making it 36 years old in 2025.

What condition is Blythe Drive over Contra Costa Canal in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in January 2023.

How much traffic does Blythe Drive over Contra Costa Canal carry?

About 1,000 vehicles per day (2020 count), of which roughly 5% are trucks.

How long is Blythe Drive over Contra Costa Canal?

The structure is 35 ft (10.8 m) long with a longest span of 35 ft (10.8 m) and a deck 40 ft wide.

Who owns Blythe Drive over Contra Costa Canal?

It is owned by the City or Municipal Highway Agency.