US Bridges

Treat Blvd over Walnut Creek

Fair

Contra Costa County, California · 0.5 MI East of Oak RD · Structure no. 28C0343

Built
1970
55 years old
Condition
Fair
inspected January 2025
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
59 ft
1 main span
Daily traffic
36,800
2019 count
Owner
Local
Other Local Agency

About this bridge

Treat Blvd over Walnut Creek is a prestressed concrete stringer/multi-beam or girder carrying Treat Blvd over Walnut Creek 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 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 36,800 vehicles a day, roughly 5% of them trucks, projected to reach 82,874 by 2047. The structure is 59 ft (18 m) long and 104 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesTreat Blvd
CrossesWalnut Creek
Location0.5 MI East of Oak RD
RouteCity Street 0
CountyContra Costa County
StateCalifornia
Coordinates37.92593, -122.04894
Functional classUrban Other Principal Arterial

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating52.5 US tons
Inventory rating32.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length59 ft (18 m)
Longest span56 ft (17.2 m)
Deck width104 ft (31.8 m)
Roadway width74 ft (22.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic36,800 (2019)
Projected traffic82,874 by 2047
Trucks5%
Lanes on structure6
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

OwnerOther Local Agency
Maintained byOther Local 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 Walnut Creek built?

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

What condition is Treat Blvd over Walnut Creek 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 2025.

How much traffic does Treat Blvd over Walnut Creek carry?

About 36,800 vehicles per day (2019 count), of which roughly 5% are trucks.

How long is Treat Blvd over Walnut Creek?

The structure is 59 ft (18 m) long with a longest span of 56 ft (17.2 m) and a deck 104 ft wide.

Who owns Treat Blvd over Walnut Creek?

It is owned by the Other Local Agency.