US Bridges

State Route 1 over San Bernardo Creek

Good

San Luis Obispo County, California · 05-SLO-001-26.86 · Structure no. 49 0066

Built
1948
77 years old, rebuilt 1959
Condition
Good
inspected September 2021
Type
Culvert
Concrete Continuous
Length
26 ft
2 main spans
Daily traffic
18,700
2009 count
Owner
State
State Highway Agency

About this bridge

State Route 1 over San Bernardo Creek is a concrete continuous culvert carrying State Route 1 over San Bernardo Creek in San Luis Obispo County, California. It was built in 1948 and reconstructed in 1959, so it is 77 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 18,700 vehicles a day, roughly 4% of them trucks, projected to reach 33,753 by 2043. The structure is 26 ft (7.9 m) long and 113 ft wide. If it were closed, the detour would be 26.7 mi (43 km).

CarriesState Route 1
CrossesSan Bernardo Creek
Location05-SLO-001-26.86
RouteState Highway 1
Coordinates35.36145, -120.80541
Functional classRural Minor Arterial

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 protection7 GoodSome minor problems.
Culvert7 GoodSome minor problems.
Last inspectionSeptember 2021
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy9: Superior 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 spans2
Design loadUnknown
Structure length26 ft (7.9 m)
Longest span12 ft (3.6 m)
Deck width113 ft (34.5 m)
Roadway width80 ft (24.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic18,700 (2009)
Projected traffic33,753 by 2043
Trucks4%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed26.7 mi (43 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 State Route 1 over San Bernardo Creek built?

It was built in 1948, making it 77 years old in 2025. It was reconstructed in 1959.

What condition is State Route 1 over San Bernardo 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 September 2021.

How much traffic does State Route 1 over San Bernardo Creek carry?

About 18,700 vehicles per day (2009 count), of which roughly 4% are trucks.

How long is State Route 1 over San Bernardo Creek?

The structure is 26 ft (7.9 m) long with a longest span of 12 ft (3.6 m) and a deck 113 ft wide.

Who owns State Route 1 over San Bernardo Creek?

It is owned by the State Highway Agency.