US Bridges

San Miguel Road over Pine Creek

Fair

Contra Costa County, California · 0.2 MI NW Treat Blvd · Structure no. 28C0357

Built
1965
60 years old, rebuilt 1988
Condition
Fair
inspected November 2023
Type
Culvert
Concrete
Length
86 ft
2 main spans
Daily traffic
2,944
1975 count
Owner
City
City or Municipal Highway Agency

About this bridge

San Miguel Road over Pine Creek is a concrete culvert carrying San Miguel Road over Pine Creek in Contra Costa County, California. It was built in 1965 and reconstructed in 1988, so it is 60 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 2,944 vehicles a day, roughly 4% of them trucks, projected to reach 10,477 by 2040. The structure is 86 ft (26.2 m) long and 47 ft wide. If it were closed, the detour would be 5 mi (8 km).

CarriesSan Miguel Road
CrossesPine Creek
Location0.2 MI NW Treat Blvd
RouteCity Street 0
Coordinates37.94838, -122.01651
Functional classUrban Minor Arterial

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 inspectionNovember 2023
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 adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating44.6 US tons
Inventory rating26.8 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckConcrete, cast-in-place
Main spans2
Design loadUnknown
Structure length86 ft (26.2 m)
Longest span31 ft (9.5 m)
Deck width47 ft (14.3 m)
Roadway width45 ft (13.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,944 (1975)
Projected traffic10,477 by 2040
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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 San Miguel Road over Pine Creek built?

It was built in 1965, making it 60 years old in 2025. It was reconstructed in 1988.

What condition is San Miguel Road over Pine Creek 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 November 2023.

How much traffic does San Miguel Road over Pine Creek carry?

About 2,944 vehicles per day (1975 count), of which roughly 4% are trucks.

How long is San Miguel Road over Pine Creek?

The structure is 86 ft (26.2 m) long with a longest span of 31 ft (9.5 m) and a deck 47 ft wide.

Who owns San Miguel Road over Pine Creek?

It is owned by the City or Municipal Highway Agency.