US Bridges

Dougherty Road over West Branch Alamo Creek

Fair

Contra Costa County, California · 1.2 MI S. of Bollinger Cy · Structure no. 28C0507

Built
2015
10 years old
Condition
Fair
inspected March 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
130 ft
1 main span
Daily traffic
2,760
2020 count
Owner
City
City or Municipal Highway Agency

About this bridge

Dougherty Road over West Branch Alamo Creek is a prestressed concrete box beam or girders - multiple carrying Dougherty Road over West Branch Alamo Creek in Contra Costa County, California. It was built in 2015, so it is 10 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 2,760 vehicles a day, roughly 2% of them trucks, projected to reach 5,978 by 2041. The structure is 130 ft (39.6 m) long and 123 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesDougherty Road
CrossesWest Branch Alamo Creek
Location1.2 MI S. of Bollinger Cy
RouteCity Street 0
CountyContra Costa County
StateCalifornia
Coordinates37.7575, -121.92017
Functional classRural Minor 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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection9 ExcellentNo 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 geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating46.4 US tons
Inventory rating35.7 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length130 ft (39.6 m)
Longest span128 ft (38.9 m)
Deck width123 ft (37.5 m)
Roadway width100 ft (30.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,760 (2020)
Projected traffic5,978 by 2041
Trucks2%
Lanes on structure7
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed3.1 mi (5 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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Dougherty Road over West Branch Alamo Creek built?

It was built in 2015, making it 10 years old in 2025.

What condition is Dougherty Road over West Branch 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 Dougherty Road over West Branch Alamo Creek carry?

About 2,760 vehicles per day (2020 count), of which roughly 2% are trucks.

How long is Dougherty Road over West Branch Alamo Creek?

The structure is 130 ft (39.6 m) long with a longest span of 128 ft (38.9 m) and a deck 123 ft wide.

Who owns Dougherty Road over West Branch Alamo Creek?

It is owned by the City or Municipal Highway Agency.