US Bridges

State Route 150 over Thacher Creek

Fair

Ventura County, California · 07-VEN-150-19.56 · Structure no. 52 0098

Built
1973
52 years old, rebuilt 1978
Condition
Fair
inspected October 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
71 ft
1 main span
Daily traffic
4,600
2020 count
Owner
State
State Highway Agency

About this bridge

State Route 150 over Thacher Creek is a prestressed concrete box beam or girders - multiple carrying State Route 150 over Thacher Creek in Ventura County, California. It was built in 1973 and reconstructed in 1978, so it is 52 years old, younger 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 4,600 vehicles a day, roughly 4% of them trucks, projected to reach 6,000 by 2041. The structure is 71 ft (21.7 m) long and 50 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesState Route 150
CrossesThacher Creek
Location07-VEN-150-19.56
RouteState Highway 150
CountyVentura County
StateCalifornia
Coordinates34.44656, -119.21145
Functional classRural Minor Arterial

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 protection7 GoodSome minor problems.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating67.9 US tons
Inventory rating35.7 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length71 ft (21.7 m)
Longest span69 ft (21.1 m)
Deck width50 ft (15.2 m)
Roadway width36 ft (10.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,600 (2020)
Projected traffic6,000 by 2041
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 State Route 150 over Thacher Creek built?

It was built in 1973, making it 52 years old in 2025. It was reconstructed in 1978.

What condition is State Route 150 over Thacher 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 October 2023.

How much traffic does State Route 150 over Thacher Creek carry?

About 4,600 vehicles per day (2020 count), of which roughly 4% are trucks.

How long is State Route 150 over Thacher Creek?

The structure is 71 ft (21.7 m) long with a longest span of 69 ft (21.1 m) and a deck 50 ft wide.

Who owns State Route 150 over Thacher Creek?

It is owned by the State Highway Agency.