US Bridges

Gentrytown Drive over Contra Costa Canal

Good

Contra Costa County, California · 0.7 MI N James Donlon · Structure no. 28C0426

Built
1973
52 years old
Condition
Good
inspected January 2025
Type
Tee Beam
Concrete
Length
31 ft
1 main span
Daily traffic
4,500
1998 count
Owner
City
City or Municipal Highway Agency

About this bridge

Gentrytown Drive over Contra Costa Canal is a concrete tee beam carrying Gentrytown Drive over Contra Costa Canal in Contra Costa County, California. It was built in 1973, so it is 52 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 4,500 vehicles a day, roughly 1% of them trucks, projected to reach 5,489 by 2043. The structure is 31 ft (9.4 m) long and 52 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesGentrytown Drive
CrossesContra Costa Canal
Location0.7 MI N James Donlon
RouteCity Street 0
CountyContra Costa County
StateCalifornia
Coordinates37.98966, -121.84015
Functional classUrban Collector

Condition and inspection

Good

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJanuary 2025
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating98.2 US tons
Inventory rating59.3 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length31 ft (9.4 m)
Longest span28 ft (8.5 m)
Deck width52 ft (15.8 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,500 (1998)
Projected traffic5,489 by 2043
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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Gentrytown Drive over Contra Costa Canal built?

It was built in 1973, making it 52 years old in 2025.

What condition is Gentrytown Drive over Contra Costa Canal 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 January 2025.

How much traffic does Gentrytown Drive over Contra Costa Canal carry?

About 4,500 vehicles per day (1998 count), of which roughly 1% are trucks.

How long is Gentrytown Drive over Contra Costa Canal?

The structure is 31 ft (9.4 m) long with a longest span of 28 ft (8.5 m) and a deck 52 ft wide.

Who owns Gentrytown Drive over Contra Costa Canal?

It is owned by the City or Municipal Highway Agency.