US Bridges

Klau Mine RD over Las Tablas Creek

Fair

San Luis Obispo County, California · 2.7 MI SW Adelaida · Structure no. 49C0029

Built
1940
85 years old
Condition
Fair
inspected April 2024
Type
Tee Beam
Concrete
Length
31 ft
1 main span
Daily traffic
93
2009 count
Owner
County
County Highway Agency

About this bridge

Klau Mine RD over Las Tablas Creek is a concrete tee beam carrying Klau Mine RD over Las Tablas Creek in San Luis Obispo County, California. It was built in 1940, so it is 85 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 93 vehicles a day, roughly 5% of them trucks, projected to reach 107 by 2046. The structure is 31 ft (9.4 m) long and 24 ft wide. If it were closed, the detour would be 8.7 mi (14 km).

CarriesKlau Mine RD
CrossesLas Tablas Creek
Location2.7 MI SW Adelaida
RouteCounty Highway 0
Coordinates35.62521, -120.89373
Functional classRural Minor Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
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 rating28.9 US tons
Inventory rating17.5 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length31 ft (9.4 m)
Longest span28 ft (8.5 m)
Deck width24 ft (7.3 m)
Roadway width22 ft (6.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic93 (2009)
Projected traffic107 by 2046
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.7 mi (14 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 Klau Mine RD over Las Tablas Creek built?

It was built in 1940, making it 85 years old in 2025.

What condition is Klau Mine RD over Las Tablas 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 April 2024.

How much traffic does Klau Mine RD over Las Tablas Creek carry?

About 93 vehicles per day (2009 count), of which roughly 5% are trucks.

How long is Klau Mine RD over Las Tablas Creek?

The structure is 31 ft (9.4 m) long with a longest span of 28 ft (8.5 m) and a deck 24 ft wide.

Who owns Klau Mine RD over Las Tablas Creek?

It is owned by the County Highway Agency.