US Bridges

Discovery ST over San Marcos Creek

Fair

San Diego County, California · 300FT S/O San Marcos Blvd · Structure no. 57C0566

Built
1967
58 years old
Condition
Fair
inspected May 2023
Type
Slab
Concrete Continuous
Length
86 ft
3 main spans
Daily traffic
12,782
2016 count
Owner
County
County Highway Agency

About this bridge

Discovery ST over San Marcos Creek is a concrete continuous slab carrying Discovery ST over San Marcos Creek in San Diego County, California. It was built in 1967, so it is 58 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 5 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 12,782 vehicles a day, roughly 2% of them trucks, projected to reach 19,726 by 2045. The structure is 86 ft (26.2 m) long and 40 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesDiscovery ST
CrossesSan Marcos Creek
Location300FT S/O San Marcos Blvd
RouteCounty Highway 0
CountySan Diego County
StateCalifornia
Coordinates33.13045, -117.20028
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating68.9 US tons
Inventory rating41.4 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length86 ft (26.2 m)
Longest span28 ft (8.5 m)
Deck width40 ft (12.2 m)
Roadway width39 ft (12 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic12,782 (2016)
Projected traffic19,726 by 2045
Trucks2%
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

OwnerCounty Highway Agency
Maintained byCounty 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 Discovery ST over San Marcos Creek built?

It was built in 1967, making it 58 years old in 2025.

What condition is Discovery ST over San Marcos 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 May 2023.

How much traffic does Discovery ST over San Marcos Creek carry?

About 12,782 vehicles per day (2016 count), of which roughly 2% are trucks.

How long is Discovery ST over San Marcos Creek?

The structure is 86 ft (26.2 m) long with a longest span of 28 ft (8.5 m) and a deck 40 ft wide.

Who owns Discovery ST over San Marcos Creek?

It is owned by the County Highway Agency.