US Bridges

Old Topanga Cyn RD over Topanga Cyn Crk

FairPosted for load

Los Angeles County, California · 50FT W/O Topanga Cyn RD · Structure no. 53C0939

Built
1926
99 years old
Condition
Fair
inspected March 2024
Type
Truss - Thru
Wood or Timber
Length
80 ft
2 main spans
Daily traffic
3,900
2014 count
Owner
County
County Highway Agency

About this bridge

Old Topanga Cyn RD over Topanga Cyn Crk is a wood or timber truss - thru carrying Old Topanga Cyn RD over Topanga Cyn Crk in Los Angeles County, California. It was built in 1926, so it is 99 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. Its operating status is: posted for load restriction.

It carries about 3,900 vehicles a day, projected to reach 4,300 by 2044. The structure is 80 ft (24.4 m) long and 29 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

Open in Google Maps
CarriesOld Topanga Cyn RD
CrossesTopanga Cyn Crk
Location50FT W/O Topanga Cyn RD
RouteCounty Highway 0
CountyLos Angeles County
StateCalifornia
Coordinates34.08978, -118.60486
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 protection4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
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 adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating45.7 US tons
Inventory rating27.4 US tons

Structure

Structure typeTruss - Thru
MaterialWood or Timber
DeckWood or timber
Main spans2
Design loadUnknown
Structure length80 ft (24.4 m)
Longest span38 ft (11.6 m)
Deck width29 ft (8.7 m)
Roadway width28 ft (8.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,900 (2014)
Projected traffic4,300 by 2044
Trucks0%
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 Topanga Cyn Crk built?

It was built in 1926, making it 99 years old in 2025.

What condition is Old Topanga Cyn RD over Topanga Cyn 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 2024.

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

About 3,900 vehicles per day (2014 count).

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

The structure is 80 ft (24.4 m) long with a longest span of 38 ft (11.6 m) and a deck 29 ft wide.

Who owns Old Topanga Cyn RD over Topanga Cyn Crk?

It is owned by the County Highway Agency.