US Bridges

North Gate Road over Pine Creek

Good

Contra Costa County, California · At Castle Rock Road · Structure no. 28C0350

Built
1970
55 years old
Condition
Good
inspected November 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
72 ft
1 main span
Daily traffic
3,500
2019 count
Owner
City
City or Municipal Highway Agency

About this bridge

North Gate Road over Pine Creek is a prestressed concrete stringer/multi-beam or girder carrying North Gate Road over Pine Creek in Contra Costa County, California. It was built in 1970, so it is 55 years old, older 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 3,500 vehicles a day, roughly 2% of them trucks, projected to reach 5,118 by 2046. The structure is 72 ft (21.8 m) long and 50 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

CarriesNorth Gate Road
CrossesPine Creek
LocationAt Castle Rock Road
RouteCity Street 0
Coordinates37.91349, -122.00652
Functional classUrban Minor Arterial

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.
Substructure8 Very GoodNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionNovember 2024
Inspection intervalevery 24 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 adequacy8: Equal to present desirable criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating51.5 US tons
Inventory rating34.3 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length72 ft (21.8 m)
Longest span69 ft (21 m)
Deck width50 ft (15.3 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,500 (2019)
Projected traffic5,118 by 2046
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed9.9 mi (16 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 North Gate Road over Pine Creek built?

It was built in 1970, making it 55 years old in 2025.

What condition is North Gate Road over Pine 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 November 2024.

How much traffic does North Gate Road over Pine Creek carry?

About 3,500 vehicles per day (2019 count), of which roughly 2% are trucks.

How long is North Gate Road over Pine Creek?

The structure is 72 ft (21.8 m) long with a longest span of 69 ft (21 m) and a deck 50 ft wide.

Who owns North Gate Road over Pine Creek?

It is owned by the City or Municipal Highway Agency.