US Bridges

San Luis Bay Drive over San Luis Obispo Creek

Good

San Luis Obispo County, California · 0.15 MI E S.R. 1 · Structure no. 49C0328

Built
1964
61 years old
Condition
Good
inspected September 2024
Type
Tee Beam
Concrete Continuous
Length
104 ft
3 main spans
Daily traffic
7,475
2014 count
Owner
County
County Highway Agency

About this bridge

San Luis Bay Drive over San Luis Obispo Creek is a concrete continuous tee beam carrying San Luis Bay Drive over San Luis Obispo Creek in San Luis Obispo County, California. It was built in 1964, so it is 61 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 7,475 vehicles a day, roughly 3% of them trucks, projected to reach 7,500 by 2044. The structure is 104 ft (31.7 m) long and 34 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

CarriesSan Luis Bay Drive
CrossesSan Luis Obispo Creek
Location0.15 MI E S.R. 1
RouteCounty Highway 0
Coordinates35.19585, -120.69721
Functional classRural Local

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.
Substructure8 Very GoodNo problems noted.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating46.4 US tons
Inventory rating33.6 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length104 ft (31.7 m)
Longest span40 ft (12.2 m)
Deck width34 ft (10.4 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,475 (2014)
Projected traffic7,500 by 2044
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 San Luis Bay Drive over San Luis Obispo Creek built?

It was built in 1964, making it 61 years old in 2025.

What condition is San Luis Bay Drive 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 September 2024.

How much traffic does San Luis Bay Drive over San Luis Obispo Creek carry?

About 7,475 vehicles per day (2014 count), of which roughly 3% are trucks.

How long is San Luis Bay Drive over San Luis Obispo Creek?

The structure is 104 ft (31.7 m) long with a longest span of 40 ft (12.2 m) and a deck 34 ft wide.

Who owns San Luis Bay Drive over San Luis Obispo Creek?

It is owned by the County Highway Agency.