US Bridges

Claudia DR over Holbrook Channel

Fair

Contra Costa County, California · 0.1 MI N Holbrook · Structure no. 28C0278

Built
1970
55 years old
Condition
Fair
inspected November 2023
Type
Culvert
Concrete Continuous
Length
25 ft
2 main spans
Daily traffic
200
1981 count
Owner
City
City or Municipal Highway Agency

About this bridge

Claudia DR over Holbrook Channel is a concrete continuous culvert carrying Claudia DR over Holbrook Channel 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 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 200 vehicles a day, roughly 1% of them trucks, projected to reach 267 by 2041. The structure is 25 ft (7.7 m) long and 46 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesClaudia DR
CrossesHolbrook Channel
Location0.1 MI N Holbrook
RouteCity Street 0
CountyContra Costa County
StateCalifornia
Coordinates37.99323, -122.03144
Functional classUrban Local

Condition and inspection

Fair

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

ComponentRatingMeaning
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating44.6 US tons
Inventory rating26.8 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadUnknown
Structure length25 ft (7.7 m)
Longest span12 ft (3.7 m)
Deck width46 ft (14 m)
Roadway width36 ft (10.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic200 (1981)
Projected traffic267 by 2041
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.2 mi (2 km)
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—
NavigationNo navigation control on waterway

Frequently asked questions

When was Claudia DR over Holbrook Channel built?

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

What condition is Claudia DR over Holbrook Channel 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 November 2023.

How much traffic does Claudia DR over Holbrook Channel carry?

About 200 vehicles per day (1981 count), of which roughly 1% are trucks.

How long is Claudia DR over Holbrook Channel?

The structure is 25 ft (7.7 m) long with a longest span of 12 ft (3.7 m) and a deck 46 ft wide.

Who owns Claudia DR over Holbrook Channel?

It is owned by the City or Municipal Highway Agency.