US Bridges

Johnson Ave over San Luis Obispo Creek

Good

San Luis Obispo County, California · S/O Dixon Landing RD · Structure no. 49C0366

Built
1957
68 years old
Condition
Good
inspected September 2022
Type
Frame
Concrete
Length
40 ft
1 main span
Daily traffic
11,435
2008 count
Owner
City
City or Municipal Highway Agency

About this bridge

Johnson Ave over San Luis Obispo Creek is a concrete frame carrying Johnson Ave over San Luis Obispo Creek in San Luis Obispo County, California. It was built in 1957, so it is 68 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 11,435 vehicles a day, roughly 3% of them trucks, projected to reach 13,573 by 2040. The structure is 40 ft (12.2 m) long and 60 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesJohnson Ave
CrossesSan Luis Obispo Creek
LocationS/O Dixon Landing RD
RouteCity Street 0
Coordinates35.2816, -120.65443
Functional classUrban 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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionSeptember 2022
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating69.7 US tons
Inventory rating51.5 US tons

Structure

Structure typeFrame
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length40 ft (12.2 m)
Longest span38 ft (11.5 m)
Deck width60 ft (18.2 m)
Roadway width46 ft (14 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic11,435 (2008)
Projected traffic13,573 by 2040
Trucks3%
Lanes on structure3
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
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 Johnson Ave over San Luis Obispo Creek built?

It was built in 1957, making it 68 years old in 2025.

What condition is Johnson Ave 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 2022.

How much traffic does Johnson Ave over San Luis Obispo Creek carry?

About 11,435 vehicles per day (2008 count), of which roughly 3% are trucks.

How long is Johnson Ave over San Luis Obispo Creek?

The structure is 40 ft (12.2 m) long with a longest span of 38 ft (11.5 m) and a deck 60 ft wide.

Who owns Johnson Ave over San Luis Obispo Creek?

It is owned by the City or Municipal Highway Agency.