US Bridges

Treat Blvd over Contra Costa Canal

Good

Contra Costa County, California · 0.1 MI E San Miguel RD · Structure no. 28C0356

Built
1970
55 years old
Condition
Good
inspected November 2021
Type
Tee Beam
Prestressed Concrete
Length
40 ft
1 main span
Daily traffic
18,245
1976 count
Owner
City
City or Municipal Highway Agency

About this bridge

Treat Blvd over Contra Costa Canal is a prestressed concrete tee beam carrying Treat Blvd over Contra Costa Canal in Contra Costa 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 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 18,245 vehicles a day, roughly 8% of them trucks, projected to reach 42,752 by 2038. The structure is 40 ft (12.2 m) long and 103 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesTreat Blvd
CrossesContra Costa Canal
Location0.1 MI E San Miguel RD
RouteCity Street 0
CountyContra Costa County
StateCalifornia
Coordinates37.94607, -122.01369
Functional classUrban Other Principal Arterial

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 inspectionNovember 2021
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating92.8 US tons
Inventory rating35.7 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length40 ft (12.2 m)
Longest span39 ft (11.8 m)
Deck width103 ft (31.4 m)
Roadway width72 ft (21.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic18,245 (1976)
Projected traffic42,752 by 2038
Trucks8%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemYes

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—
NavigationNo navigation control on waterway

Frequently asked questions

When was Treat Blvd over Contra Costa Canal built?

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

What condition is Treat Blvd 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 November 2021.

How much traffic does Treat Blvd over Contra Costa Canal carry?

About 18,245 vehicles per day (1976 count), of which roughly 8% are trucks.

How long is Treat Blvd over Contra Costa Canal?

The structure is 40 ft (12.2 m) long with a longest span of 39 ft (11.8 m) and a deck 103 ft wide.

Who owns Treat Blvd over Contra Costa Canal?

It is owned by the City or Municipal Highway Agency.