US Bridges

Tank Farm RD over Tank Farm Ditch

Good

San Luis Obispo County, California · At Hollyhock Road · Structure no. 49C0409

Built
1988
37 years old
Condition
Good
inspected July 2023
Type
Slab
Concrete
Length
32 ft
1 main span
Daily traffic
8,803
2008 count
Owner
City
City or Municipal Highway Agency

About this bridge

Tank Farm RD over Tank Farm Ditch is a concrete slab carrying Tank Farm RD over Tank Farm Ditch in San Luis Obispo County, California. It was built in 1988, so it is 37 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 8,803 vehicles a day, roughly 3% of them trucks, projected to reach 15,460 by 2041. The structure is 32 ft (9.8 m) long and 80 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesTank Farm RD
CrossesTank Farm Ditch
LocationAt Hollyhock Road
RouteCity Street 0
CountySan Luis Obispo County
StateCalifornia
Coordinates35.24966, -120.63773
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 inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.6 US tons
Inventory rating35.7 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length32 ft (9.8 m)
Longest span29 ft (8.7 m)
Deck width80 ft (24.3 m)
Roadway width64 ft (19.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,803 (2008)
Projected traffic15,460 by 2041
Trucks3%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.9 mi (3 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 Tank Farm RD over Tank Farm Ditch built?

It was built in 1988, making it 37 years old in 2025.

What condition is Tank Farm RD over Tank Farm Ditch 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 2023.

How much traffic does Tank Farm RD over Tank Farm Ditch carry?

About 8,803 vehicles per day (2008 count), of which roughly 3% are trucks.

How long is Tank Farm RD over Tank Farm Ditch?

The structure is 32 ft (9.8 m) long with a longest span of 29 ft (8.7 m) and a deck 80 ft wide.

Who owns Tank Farm RD over Tank Farm Ditch?

It is owned by the City or Municipal Highway Agency.