US Bridges

State Route 27 over Topanga Creek

Good

Los Angeles County, California · 07-LA-027-2.02 · Structure no. 53 0143

Built
1941
84 years old, rebuilt 1989
Condition
Good
inspected January 2024
Type
Tee Beam
Concrete
Length
116 ft
1 main span
Daily traffic
15,950
2014 count
Owner
State
State Highway Agency

About this bridge

State Route 27 over Topanga Creek is a concrete tee beam carrying State Route 27 over Topanga Creek in Los Angeles County, California. It was built in 1941 and reconstructed in 1989, so it is 84 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 15,950 vehicles a day, roughly 2% of them trucks, projected to reach 16,784 by 2046. The structure is 116 ft (35.4 m) long and 44 ft wide. If it were closed, the detour would be 29.2 mi (47 km).

CarriesState Route 27
CrossesTopanga Creek
Location07-LA-027-2.02
RouteState Highway 27
Coordinates34.06409, -118.58696
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJanuary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating110 US tons
Inventory rating68.9 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length116 ft (35.4 m)
Longest span110 ft (33.4 m)
Deck width44 ft (13.3 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic15,950 (2014)
Projected traffic16,784 by 2046
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed29.2 mi (47 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 Topanga Creek built?

It was built in 1941, making it 84 years old in 2025. It was reconstructed in 1989.

What condition is State Route 27 over Topanga 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 Topanga Creek carry?

About 15,950 vehicles per day (2014 count), of which roughly 2% are trucks.

How long is State Route 27 over Topanga Creek?

The structure is 116 ft (35.4 m) long with a longest span of 110 ft (33.4 m) and a deck 44 ft wide.

Who owns State Route 27 over Topanga Creek?

It is owned by the State Highway Agency.