US Bridges

US Highway 101 SB over San Luis Obispo Creek

Good

San Luis Obispo County, California · 05-SLO-101-R21.49 · Structure no. 49 0014L

Built
1948
77 years old, rebuilt 2002
Condition
Good
inspected July 2024
Type
Tee Beam
Concrete Continuous
Length
570 ft
16 main spans
Daily traffic
31,000
2009 count
Owner
State
State Highway Agency

About this bridge

US Highway 101 SB over San Luis Obispo Creek is a concrete continuous tee beam carrying US Highway 101 SB over San Luis Obispo Creek in San Luis Obispo County, California. It was built in 1948 and reconstructed in 2002, 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 31,000 vehicles a day, roughly 9% of them trucks, projected to reach 47,278 by 2044. The structure is 570 ft (173.7 m) long and 42 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

CarriesUS Highway 101 SB
CrossesSan Luis Obispo Creek
Location05-SLO-101-R21.49
RouteU.S. Route 101
Coordinates35.18471, -120.70146
Functional classRural Principal Arterial - Other

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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry7: Better than present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating27.9 US tons
Inventory rating19.6 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans16
Design loadHS 20
Structure length570 ft (173.7 m)
Longest span45 ft (13.7 m)
Deck width42 ft (12.8 m)
Roadway width38 ft (11.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic31,000 (2009)
Projected traffic47,278 by 2044
Trucks9%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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 US Highway 101 SB over San Luis Obispo Creek built?

It was built in 1948, making it 77 years old in 2025. It was reconstructed in 2002.

What condition is US Highway 101 SB over San Luis Obispo 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 July 2024.

How much traffic does US Highway 101 SB over San Luis Obispo Creek carry?

About 31,000 vehicles per day (2009 count), of which roughly 9% are trucks.

How long is US Highway 101 SB over San Luis Obispo Creek?

The structure is 570 ft (173.7 m) long with a longest span of 45 ft (13.7 m) and a deck 42 ft wide.

Who owns US Highway 101 SB over San Luis Obispo Creek?

It is owned by the State Highway Agency.