US Bridges

Hillcrest Ave over Gillippi Gulch

Fair

Contra Costa County, California · 0.2 MI N of E 18th ST · Structure no. 28C0294

Built
1958
67 years old
Condition
Fair
inspected January 2025
Type
Culvert
Concrete Continuous
Length
32 ft
4 main spans
Daily traffic
4,000
2020 count
Owner
City
City or Municipal Highway Agency

About this bridge

Hillcrest Ave over Gillippi Gulch is a concrete continuous culvert carrying Hillcrest Ave over Gillippi Gulch in Contra Costa County, California. It was built in 1958, so it is 67 years old, older 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 4,000 vehicles a day, roughly 3% of them trucks, projected to reach 8,753 by 2047. The structure is 32 ft (9.8 m) long and 47 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesHillcrest Ave
CrossesGillippi Gulch
Location0.2 MI N of E 18th ST
RouteCity Street 0
CountyContra Costa County
StateCalifornia
Coordinates38.00639, -121.7878
Functional classUrban Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Channel and channel protection8 Very GoodNo problems noted.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJanuary 2025
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 alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating44.6 US tons
Inventory rating26.8 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadUnknown
Structure length32 ft (9.8 m)
Longest span8 ft (2.4 m)
Deck width47 ft (14.4 m)
Roadway width37 ft (11.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,000 (2020)
Projected traffic8,753 by 2047
Trucks3%
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 Hillcrest Ave over Gillippi Gulch built?

It was built in 1958, making it 67 years old in 2025.

What condition is Hillcrest Ave over Gillippi Gulch 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 January 2025.

How much traffic does Hillcrest Ave over Gillippi Gulch carry?

About 4,000 vehicles per day (2020 count), of which roughly 3% are trucks.

How long is Hillcrest Ave over Gillippi Gulch?

The structure is 32 ft (9.8 m) long with a longest span of 8 ft (2.4 m) and a deck 47 ft wide.

Who owns Hillcrest Ave over Gillippi Gulch?

It is owned by the City or Municipal Highway Agency.