US Bridges

Bollinger Canyon over West Branch Alamo Creek

Good

Contra Costa County, California · 0.1 MI W. of Dougherty RD · Structure no. 28C0244

Built
2005
20 years old
Condition
Good
inspected March 2024
Type
Arch - Deck
Steel
Length
74 ft
1 main span
Daily traffic
2,760
2020 count
Owner
City
City or Municipal Highway Agency

About this bridge

Bollinger Canyon over West Branch Alamo Creek is a steel arch - deck carrying Bollinger Canyon over West Branch Alamo Creek in Contra Costa County, California. It was built in 2005, so it is 20 years old, younger than the California average of 54.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 2,760 vehicles a day, roughly 2% of them trucks, projected to reach 5,978 by 2045. The structure is 74 ft (22.5 m) long. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesBollinger Canyon
CrossesWest Branch Alamo Creek
Location0.1 MI W. of Dougherty RD
RouteCity Street 0
CountyContra Costa County
StateCalifornia
Coordinates37.77325, -121.92596
Functional classUrban Other Principal Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Superstructure7 GoodSome minor problems.
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 within limits of footing or piles
Structural evaluation7: Better than present minimum 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 typeArch - Deck
MaterialSteel
DeckNot applicable
Main spans1 (+2 approach)
Design loadUnknown
Structure length74 ft (22.5 m)
Longest span40 ft (12.3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,760 (2020)
Projected traffic5,978 by 2045
Trucks2%
Lanes on structure7
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemYes

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 Bollinger Canyon over West Branch Alamo Creek built?

It was built in 2005, making it 20 years old in 2025.

What condition is Bollinger Canyon over West Branch Alamo Creek in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in March 2024.

How much traffic does Bollinger Canyon over West Branch Alamo Creek carry?

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

How long is Bollinger Canyon over West Branch Alamo Creek?

The structure is 74 ft (22.5 m) long with a longest span of 40 ft (12.3 m).

Who owns Bollinger Canyon over West Branch Alamo Creek?

It is owned by the City or Municipal Highway Agency.