US Bridges

Dougherty over Lower M. Branch Alamo CR

Fair

Contra Costa County, California · At Bollinger Canyon RD · Structure no. 28C0255

Built
2007
18 years old
Condition
Fair
inspected March 2024
Type
Box Beam or Girders - Single or Spread
Prestressed Concrete Continuous
Length
297 ft
3 main spans
Daily traffic
100
2020 count
Owner
City
City or Municipal Highway Agency

About this bridge

Dougherty over Lower M. Branch Alamo CR is a prestressed concrete continuous box beam or girders - single or spread carrying Dougherty over Lower M. Branch Alamo CR in Contra Costa County, California. It was built in 2007, so it is 18 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 100 vehicles a day, projected to reach 205 by 2041. The structure is 297 ft (90.5 m) long and 123 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesDougherty
CrossesLower M. Branch Alamo CR
LocationAt Bollinger Canyon RD
RouteCounty Highway 0
CountyContra Costa County
StateCalifornia
Coordinates37.74817, -121.91661
Functional classRural 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 protection7 GoodSome minor problems.
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 geometry9: Superior to present desirable criteria
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

Structure typeBox Beam or Girders - Single or Spread
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length297 ft (90.5 m)
Longest span135 ft (41.1 m)
Deck width123 ft (37.5 m)
Roadway width93 ft (28.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic100 (2020)
Projected traffic205 by 2041
Trucks—
Lanes on structure6
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed123.7 mi (199 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 over Lower M. Branch Alamo CR built?

It was built in 2007, making it 18 years old in 2025.

What condition is Dougherty over Lower M. Branch Alamo CR 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 over Lower M. Branch Alamo CR carry?

About 100 vehicles per day (2020 count).

How long is Dougherty over Lower M. Branch Alamo CR?

The structure is 297 ft (90.5 m) long with a longest span of 135 ft (41.1 m) and a deck 123 ft wide.

Who owns Dougherty over Lower M. Branch Alamo CR?

It is owned by the City or Municipal Highway Agency.