US Bridges

Ontario Road over San Luis Obispo Creek

Good

San Luis Obispo County, California · 0.3 MI N Avila Road · Structure no. 49C0410

Built
1994
31 years old
Condition
Good
inspected September 2024
Type
Box Beam or Girders - Multiple
Concrete Continuous
Length
688 ft
3 main spans
Daily traffic
1,620
2014 count
Owner
County
County Highway Agency

About this bridge

Ontario Road over San Luis Obispo Creek is a concrete continuous box beam or girders - multiple carrying Ontario Road over San Luis Obispo Creek in San Luis Obispo County, California. It was built in 1994, so it is 31 years old, younger 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 1,620 vehicles a day, roughly 5% of them trucks, projected to reach 1,062 by 2044. The structure is 688 ft (209.7 m) long and 31 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesOntario Road
CrossesSan Luis Obispo Creek
Location0.3 MI N Avila Road
RouteCounty Highway 0
Coordinates35.18321, -120.70367
Functional classUrban 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.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 2024
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being 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

MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3 (+12 approach)
Design loadHS 20 + Mod
Structure length688 ft (209.7 m)
Longest span80 ft (24.4 m)
Deck width31 ft (9.3 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,620 (2014)
Projected traffic1,062 by 2044
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 Ontario Road over San Luis Obispo Creek built?

It was built in 1994, making it 31 years old in 2025.

What condition is Ontario Road 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 Ontario Road over San Luis Obispo Creek carry?

About 1,620 vehicles per day (2014 count), of which roughly 5% are trucks.

How long is Ontario Road over San Luis Obispo Creek?

The structure is 688 ft (209.7 m) long with a longest span of 80 ft (24.4 m) and a deck 31 ft wide.

Who owns Ontario Road over San Luis Obispo Creek?

It is owned by the County Highway Agency.