US Bridges

Old Topanga Cyn RD over Old Topanga Crk

Fair

Los Angeles County, California · 1.4MI W/O Topanga Cyn Bl · Structure no. 53C0980

Built
1937
88 years old, rebuilt 1962
Condition
Fair
inspected March 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
56 ft
1 main span
Daily traffic
2,712
2013 count
Owner
County
County Highway Agency

About this bridge

Old Topanga Cyn RD over Old Topanga Crk is a steel stringer/multi-beam or girder carrying Old Topanga Cyn RD over Old Topanga Crk in Los Angeles County, California. It was built in 1937 and reconstructed in 1962, so it is 88 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 2,712 vehicles a day, roughly 2% of them trucks, projected to reach 2,983 by 2043. The structure is 56 ft (17.1 m) long and 31 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

Open in Google Maps
CarriesOld Topanga Cyn RD
CrossesOld Topanga Crk
Location1.4MI W/O Topanga Cyn Bl
RouteCounty Highway 0
CountyLos Angeles County
StateCalifornia
Coordinates34.10247, -118.62131
Functional classRural Minor Collector

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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating52.5 US tons
Inventory rating31.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length56 ft (17.1 m)
Longest span49 ft (14.9 m)
Deck width31 ft (9.6 m)
Roadway width28 ft (8.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,712 (2013)
Projected traffic2,983 by 2043
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed9.9 mi (16 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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 Old Topanga Cyn RD over Old Topanga Crk built?

It was built in 1937, making it 88 years old in 2025. It was reconstructed in 1962.

What condition is Old Topanga Cyn RD over Old Topanga Crk 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 March 2023.

How much traffic does Old Topanga Cyn RD over Old Topanga Crk carry?

About 2,712 vehicles per day (2013 count), of which roughly 2% are trucks.

How long is Old Topanga Cyn RD over Old Topanga Crk?

The structure is 56 ft (17.1 m) long with a longest span of 49 ft (14.9 m) and a deck 31 ft wide.

Who owns Old Topanga Cyn RD over Old Topanga Crk?

It is owned by the County Highway Agency.