US Bridges

Foothill Road over Laguna Creek

Fair

San Luis Obispo County, California · 0.3 MI N Los Osos Valy RD · Structure no. 49C0222

Built
1959
66 years old
Condition
Fair
inspected August 2024
Type
Culvert
Concrete Continuous
Length
35 ft
3 main spans
Daily traffic
8,654
2014 count
Owner
County
County Highway Agency

About this bridge

Foothill Road over Laguna Creek is a concrete continuous culvert carrying Foothill Road over Laguna Creek in San Luis Obispo County, California. It was built in 1959, so it is 66 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 8,654 vehicles a day, roughly 5% of them trucks, projected to reach 19,124 by 2044. The structure is 35 ft (10.7 m) long and 39 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

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CarriesFoothill Road
CrossesLaguna Creek
Location0.3 MI N Los Osos Valy RD
RouteCounty Highway 0
CountySan Luis Obispo County
StateCalifornia
Coordinates35.27983, -120.70961
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 protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2024
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating59.6 US tons
Inventory rating35.7 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans3
Design loadH 20
Structure length35 ft (10.7 m)
Longest span10 ft (3 m)
Deck width39 ft (12 m)
Roadway width37 ft (11.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,654 (2014)
Projected traffic19,124 by 2044
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.8 mi (11 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 Foothill Road over Laguna Creek built?

It was built in 1959, making it 66 years old in 2025.

What condition is Foothill Road over Laguna 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 August 2024.

How much traffic does Foothill Road over Laguna Creek carry?

About 8,654 vehicles per day (2014 count), of which roughly 5% are trucks.

How long is Foothill Road over Laguna Creek?

The structure is 35 ft (10.7 m) long with a longest span of 10 ft (3 m) and a deck 39 ft wide.

Who owns Foothill Road over Laguna Creek?

It is owned by the County Highway Agency.