US Bridges

Portola RD over Atascadero Creek

Fair

San Luis Obispo County, California · 0.1 MI West of SR 41 · Structure no. 49C0295

Built
1950
75 years old
Condition
Fair
inspected July 2023
Type
Tee Beam
Concrete Continuous
Length
83 ft
2 main spans
Daily traffic
3,500
2010 count
Owner
City
City or Municipal Highway Agency

About this bridge

Portola RD over Atascadero Creek is a concrete continuous tee beam carrying Portola RD over Atascadero Creek in San Luis Obispo County, California. It was built in 1950, so it is 75 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 5 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 3,500 vehicles a day, roughly 3% of them trucks, projected to reach 4,225 by 2041. The structure is 83 ft (25.3 m) long and 26 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesPortola RD
CrossesAtascadero Creek
Location0.1 MI West of SR 41
RouteCity Street 0
CountySan Luis Obispo County
StateCalifornia
Coordinates35.46962, -120.67149
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating32.2 US tons
Inventory rating19.3 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadUnknown
Structure length83 ft (25.3 m)
Longest span40 ft (12.2 m)
Deck width26 ft (7.9 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,500 (2010)
Projected traffic4,225 by 2041
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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 Portola RD over Atascadero Creek built?

It was built in 1950, making it 75 years old in 2025.

What condition is Portola RD over Atascadero 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 July 2023.

How much traffic does Portola RD over Atascadero Creek carry?

About 3,500 vehicles per day (2010 count), of which roughly 3% are trucks.

How long is Portola RD over Atascadero Creek?

The structure is 83 ft (25.3 m) long with a longest span of 40 ft (12.2 m) and a deck 26 ft wide.

Who owns Portola RD over Atascadero Creek?

It is owned by the City or Municipal Highway Agency.