US Bridges

State Route 27 over Calabasas Creek

Good

Los Angeles County, California · 07-LA-027-13.93-LA · Structure no. 53 0455

Built
1962
63 years old
Condition
Good
inspected January 2024
Type
Culvert
Concrete
Length
41 ft
2 main spans
Daily traffic
42,000
2014 count
Owner
State
State Highway Agency

About this bridge

State Route 27 over Calabasas Creek is a concrete culvert carrying State Route 27 over Calabasas Creek in Los Angeles County, California. It was built in 1962, so it is 63 years old, older 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 42,000 vehicles a day, roughly 8% of them trucks, projected to reach 54,891 by 2046. The structure is 41 ft (12.5 m) long and 96 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesState Route 27
CrossesCalabasas Creek
Location07-LA-027-13.93-LA
RouteState Highway 27
Coordinates34.19216, -118.60578
Functional classUrban Other Principal Arterial

Condition and inspection

Good

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

ComponentRatingMeaning
Channel and channel protection8 Very GoodNo problems noted.
Culvert7 GoodSome minor problems.
Last inspectionJanuary 2024
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating73.2 US tons
Inventory rating44 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadHS 20
Structure length41 ft (12.5 m)
Longest span20 ft (6.2 m)
Deck width96 ft (29.2 m)
Roadway width84 ft (25.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic42,000 (2014)
Projected traffic54,891 by 2046
Trucks8%
Lanes on structure5
Traffic directionTwo-way traffic
CarriesOverpass structure at an interchange
CrossesWaterway
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—
NavigationNo navigation control on waterway

Frequently asked questions

When was State Route 27 over Calabasas Creek built?

It was built in 1962, making it 63 years old in 2025.

What condition is State Route 27 over Calabasas Creek 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 January 2024.

How much traffic does State Route 27 over Calabasas Creek carry?

About 42,000 vehicles per day (2014 count), of which roughly 8% are trucks.

How long is State Route 27 over Calabasas Creek?

The structure is 41 ft (12.5 m) long with a longest span of 20 ft (6.2 m) and a deck 96 ft wide.

Who owns State Route 27 over Calabasas Creek?

It is owned by the State Highway Agency.