US Bridges

U.S. Highway 101 over Hillside

Good

Ventura County, California · 07-VEN-101-4.58-THOK · Structure no. 52 0411R

Built
1982
43 years old
Condition
Good
inspected June 2024
Type
Slab
Concrete Continuous
Length
146 ft
4 main spans
Daily traffic
192,000
2017 count
Owner
State
State Highway Agency

About this bridge

U.S. Highway 101 over Hillside is a concrete continuous slab carrying U.S. Highway 101 over Hillside in Ventura County, California. It was built in 1982, so it is 43 years old, younger than the California average of 54.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 192,000 vehicles a day, roughly 18% of them trucks, projected to reach 289,920 by 2042. The structure is 146 ft (44.5 m) long and 36 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesU.S. Highway 101
CrossesHillside
Location07-VEN-101-4.58-THOK
RouteU.S. Route 101
Coordinates34.18027, -118.88457
Functional classUrban Principal Arterial - Other Freeway or Expressway

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment9: Superior to present desirable criteria
Operating rating47.2 US tons
Inventory rating33.2 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20 + Mod
Structure length146 ft (44.5 m)
Longest span36 ft (11 m)
Deck width36 ft (10.9 m)
Roadway width136 ft (41.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic192,000 (2017)
Projected traffic289,920 by 2042
Trucks18%
Lanes on structure8
Traffic directionTwo-way traffic
CarriesHighway
CrossesOther
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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 U.S. Highway 101 over Hillside built?

It was built in 1982, making it 43 years old in 2025.

What condition is U.S. Highway 101 over Hillside in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in June 2024.

How much traffic does U.S. Highway 101 over Hillside carry?

About 192,000 vehicles per day (2017 count), of which roughly 18% are trucks.

How long is U.S. Highway 101 over Hillside?

The structure is 146 ft (44.5 m) long with a longest span of 36 ft (11 m) and a deck 36 ft wide.

Who owns U.S. Highway 101 over Hillside?

It is owned by the State Highway Agency.