US Bridges

State Route 23 over Olsen Road

Fair

Ventura County, California · 07-VEN-023-R8.21-THOK · Structure no. 52 0312S

Built
1970
55 years old
Condition
Fair
inspected May 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete Continuous
Length
207 ft
2 main spans
Daily traffic
2,500
2015 count
Owner
State
State Highway Agency

About this bridge

State Route 23 over Olsen Road is a prestressed concrete continuous box beam or girders - multiple carrying State Route 23 over Olsen Road in Ventura County, California. It was built in 1970, so it is 55 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 2,500 vehicles a day, roughly 1% of them trucks, projected to reach 4,684 by 2041. The structure is 207 ft (63 m) long and 26 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesState Route 23
CrossesOlsen Road
Location07-VEN-023-R8.21-THOK
RouteState Highway 23
CountyVentura County
StateCalifornia
Coordinates34.24159, -118.83952
Functional classUrban Principal Arterial - Other Freeway or Expressway

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.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment8: Equal to present desirable criteria
Operating rating53.9 US tons
Inventory rating34 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length207 ft (63 m)
Longest span111 ft (33.8 m)
Deck width26 ft (7.9 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,500 (2015)
Projected traffic4,684 by 2041
Trucks1%
Lanes on structure1
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was State Route 23 over Olsen Road built?

It was built in 1970, making it 55 years old in 2025.

What condition is State Route 23 over Olsen Road 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 May 2023.

How much traffic does State Route 23 over Olsen Road carry?

About 2,500 vehicles per day (2015 count), of which roughly 1% are trucks.

How long is State Route 23 over Olsen Road?

The structure is 207 ft (63 m) long with a longest span of 111 ft (33.8 m) and a deck 26 ft wide.

Who owns State Route 23 over Olsen Road?

It is owned by the State Highway Agency.