US Bridges

Kanan Dume RD over Newton Cyn

Fair

Los Angeles County, California · 4.4MI N/O SR-1 HWY · Structure no. 53C1846

Built
1960
65 years old
Condition
Fair
inspected April 2023
Type
Culvert
Steel
Length
24 ft
4 main spans
Daily traffic
12,669
2017 count
Owner
County
County Highway Agency

About this bridge

Kanan Dume RD over Newton Cyn is a steel culvert carrying Kanan Dume RD over Newton Cyn in Los Angeles County, California. It was built in 1960, so it is 65 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 6 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 12,669 vehicles a day, roughly 2% of them trucks, projected to reach 14,569 by 2041. The structure is 24 ft (7.3 m) long and 46 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

Open in Google Maps
CarriesKanan Dume RD
CrossesNewton Cyn
Location4.4MI N/O SR-1 HWY
RouteCounty Highway 0W482
CountyLos Angeles County
StateCalifornia
Coordinates34.07684, -118.81501
Functional classRural Major 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
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating110 US tons
Inventory rating110 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans4
Design loadUnknown
Structure length24 ft (7.3 m)
Longest span4 ft (1.2 m)
Deck width46 ft (14 m)
Roadway width42 ft (12.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic12,669 (2017)
Projected traffic14,569 by 2041
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 Kanan Dume RD over Newton Cyn built?

It was built in 1960, making it 65 years old in 2025.

What condition is Kanan Dume RD over Newton Cyn 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 April 2023.

How much traffic does Kanan Dume RD over Newton Cyn carry?

About 12,669 vehicles per day (2017 count), of which roughly 2% are trucks.

How long is Kanan Dume RD over Newton Cyn?

The structure is 24 ft (7.3 m) long with a longest span of 4 ft (1.2 m) and a deck 46 ft wide.

Who owns Kanan Dume RD over Newton Cyn?

It is owned by the County Highway Agency.