US Bridges

Tassajara RD over Tassajara Creek

Fair

San Luis Obispo County, California · 2.1 MI W US 101 · Structure no. 49C0333

Built
1960
65 years old, rebuilt 1997
Condition
Fair
inspected July 2024
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
27 ft
1 main span
Daily traffic
228
2018 count
Owner
County
County Highway Agency

About this bridge

Tassajara RD over Tassajara Creek is a wood or timber stringer/multi-beam or girder carrying Tassajara RD over Tassajara Creek in San Luis Obispo County, California. It was built in 1960 and reconstructed in 1997, so it is 65 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 6 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 228 vehicles a day, roughly 1% of them trucks, projected to reach 534 by 2044. The structure is 27 ft (8.2 m) long and 14 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

CarriesTassajara RD
CrossesTassajara Creek
Location2.1 MI W US 101
RouteCounty Highway 0
Coordinates35.38306, -120.67154
Functional classRural Local

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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating37.1 US tons
Inventory rating27.4 US tons

Structure

MaterialWood or Timber
DeckWood or timber
Main spans1
Design loadHS 20
Structure length27 ft (8.2 m)
Longest span25 ft (7.6 m)
Deck width14 ft (4.2 m)
Roadway width13 ft (4.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic228 (2018)
Projected traffic534 by 2044
Trucks1%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 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 Tassajara RD over Tassajara Creek built?

It was built in 1960, making it 65 years old in 2025. It was reconstructed in 1997.

What condition is Tassajara RD over Tassajara 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 2024.

How much traffic does Tassajara RD over Tassajara Creek carry?

About 228 vehicles per day (2018 count), of which roughly 1% are trucks.

How long is Tassajara RD over Tassajara Creek?

The structure is 27 ft (8.2 m) long with a longest span of 25 ft (7.6 m) and a deck 14 ft wide.

Who owns Tassajara RD over Tassajara Creek?

It is owned by the County Highway Agency.