US Bridges

Bent Creek Drive over Alamo Creek

Fair

Contra Costa County, California · 0.3 MI S Old Ranch RD · Structure no. 28C0453

Built
1990
35 years old
Condition
Fair
inspected March 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
102 ft
1 main span
Daily traffic
700
2020 count
Owner
City
City or Municipal Highway Agency

About this bridge

Bent Creek Drive over Alamo Creek is a prestressed concrete box beam or girders - multiple carrying Bent Creek Drive over Alamo Creek in Contra Costa County, California. It was built in 1990, so it is 35 years old, younger 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 700 vehicles a day, roughly 1% of them trucks, projected to reach 2,173 by 2041. The structure is 102 ft (31.1 m) long and 40 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesBent Creek Drive
CrossesAlamo Creek
Location0.3 MI S Old Ranch RD
RouteCity Street 0
Coordinates37.73432, -121.91366
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to 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

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length102 ft (31.1 m)
Longest span100 ft (30.6 m)
Deck width40 ft (12.1 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic700 (2020)
Projected traffic2,173 by 2041
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.9 mi (3 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 Bent Creek Drive over Alamo Creek built?

It was built in 1990, making it 35 years old in 2025.

What condition is Bent Creek Drive over Alamo 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 March 2024.

How much traffic does Bent Creek Drive over Alamo Creek carry?

About 700 vehicles per day (2020 count), of which roughly 1% are trucks.

How long is Bent Creek Drive over Alamo Creek?

The structure is 102 ft (31.1 m) long with a longest span of 100 ft (30.6 m) and a deck 40 ft wide.

Who owns Bent Creek Drive over Alamo Creek?

It is owned by the City or Municipal Highway Agency.