US Bridges

Boulder Creek RD over Cedar Creek

Good

San Diego County, California · 5.6 MI S/O SR-78 · Structure no. 57C0370

Built
1944
81 years old
Condition
Good
inspected January 2025
Type
Slab
Concrete Continuous
Length
32 ft
2 main spans
Daily traffic
77
2019 count
Owner
County
County Highway Agency

About this bridge

Boulder Creek RD over Cedar Creek is a concrete continuous slab carrying Boulder Creek RD over Cedar Creek in San Diego County, California. It was built in 1944, so it is 81 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 77 vehicles a day, roughly 1% of them trucks, projected to reach 209 by 2047. The structure is 32 ft (9.8 m) long and 22 ft wide. If it were closed, the detour would be 18.6 mi (30 km).

CarriesBoulder Creek RD
CrossesCedar Creek
Location5.6 MI S/O SR-78
RouteCounty Highway 0
Coordinates33.02557, -116.63455
Functional classRural Minor Collector

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.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJanuary 2025
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 adequacy7: Better than present minimum criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating29.7 US tons
Inventory rating17.9 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadUnknown
Structure length32 ft (9.8 m)
Longest span15 ft (4.6 m)
Deck width22 ft (6.6 m)
Roadway width20 ft (6.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic77 (2019)
Projected traffic209 by 2047
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed18.6 mi (30 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 Boulder Creek RD over Cedar Creek built?

It was built in 1944, making it 81 years old in 2025.

What condition is Boulder Creek RD over Cedar 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 January 2025.

How much traffic does Boulder Creek RD over Cedar Creek carry?

About 77 vehicles per day (2019 count), of which roughly 1% are trucks.

How long is Boulder Creek RD over Cedar Creek?

The structure is 32 ft (9.8 m) long with a longest span of 15 ft (4.6 m) and a deck 22 ft wide.

Who owns Boulder Creek RD over Cedar Creek?

It is owned by the County Highway Agency.