US Bridges

Tassajara CR RD over Santa Margarita Creek

Fair

San Luis Obispo County, California · West of RTE 101 · Structure no. 49C0281

Built
1940
85 years old
Condition
Fair
inspected July 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
34 ft
1 main span
Daily traffic
228
2018 count
Owner
County
County Highway Agency

About this bridge

Tassajara CR RD over Santa Margarita Creek is a steel stringer/multi-beam or girder carrying Tassajara CR RD over Santa Margarita 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 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 523 by 2044. The structure is 34 ft (10.4 m) long and 18 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesTassajara CR RD
CrossesSanta Margarita Creek
LocationWest of RTE 101
RouteCounty Highway 0
CountySan Luis Obispo County
StateCalifornia
Coordinates35.3706, -120.64171
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.
Superstructure8 Very GoodNo problems noted.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating31.7 US tons
Inventory rating19 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckWood or timber
Main spans1
Design loadUnknown
Structure length34 ft (10.4 m)
Longest span32 ft (9.8 m)
Deck width18 ft (5.5 m)
Roadway width17 ft (5.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic228 (2018)
Projected traffic523 by 2044
Trucks1%
Lanes on structure2
Traffic directionTwo-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 CR RD over Santa Margarita Creek built?

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

What condition is Tassajara CR RD over Santa Margarita 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 CR RD over Santa Margarita Creek carry?

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

How long is Tassajara CR RD over Santa Margarita Creek?

The structure is 34 ft (10.4 m) long with a longest span of 32 ft (9.8 m) and a deck 18 ft wide.

Who owns Tassajara CR RD over Santa Margarita Creek?

It is owned by the County Highway Agency.