US Bridges

LA Cienega Road over N. Fork San Marcos Creek

Good

San Diego County, California · 250F E/O Twin Oaks Vly RD · Structure no. 57C0775

Built
1992
33 years old
Condition
Good
inspected March 2023
Type
Culvert
Concrete Continuous
Length
40 ft
3 main spans
Daily traffic
4,300
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

LA Cienega Road over N. Fork San Marcos Creek is a concrete continuous culvert carrying LA Cienega Road over N. Fork San Marcos Creek in San Diego County, California. It was built in 1992, so it is 33 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 4,300 vehicles a day, roughly 2% of them trucks, projected to reach 4,631 by 2045. The structure is 40 ft (12.2 m) long. If it were closed, the detour would be 1.2 mi (2 km).

CarriesLA Cienega Road
CrossesN. Fork San Marcos Creek
Location250F E/O Twin Oaks Vly RD
RouteCity Street 0
Coordinates33.17312, -117.15899
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
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert7 GoodSome minor problems.
Last inspectionMarch 2023
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
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 typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans3
Design loadUnknown
Structure length40 ft (12.2 m)
Longest span12 ft (3.7 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,300 (2023)
Projected traffic4,631 by 2045
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.2 mi (2 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 LA Cienega Road over N. Fork San Marcos Creek built?

It was built in 1992, making it 33 years old in 2025.

What condition is LA Cienega Road over N. Fork San Marcos 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 2023.

How much traffic does LA Cienega Road over N. Fork San Marcos Creek carry?

About 4,300 vehicles per day (2023 count), of which roughly 2% are trucks.

How long is LA Cienega Road over N. Fork San Marcos Creek?

The structure is 40 ft (12.2 m) long with a longest span of 12 ft (3.7 m).

Who owns LA Cienega Road over N. Fork San Marcos Creek?

It is owned by the City or Municipal Highway Agency.