US Bridges

Plummer ST over Santa Susana Creek

Good

Los Angeles County, California · 0.3 M W/O SR-27(@FARRALN) · Structure no. 53C1292

Built
1966
59 years old
Condition
Good
inspected October 2024
Type
Culvert
Concrete
Length
45 ft
1 main span
Daily traffic
19,191
2016 count
Owner
City
City or Municipal Highway Agency

About this bridge

Plummer ST over Santa Susana Creek is a concrete culvert carrying Plummer ST over Santa Susana Creek in Los Angeles County, California. It was built in 1966, so it is 59 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 19,191 vehicles a day, roughly 3% of them trucks, projected to reach 29,140 by 2042. The structure is 45 ft (13.7 m) long and 151 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesPlummer ST
CrossesSanta Susana Creek
Location0.3 M W/O SR-27(@FARRALN)
RouteCity Street 0
Coordinates34.24254, -118.61027
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 inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating44.6 US tons
Inventory rating26.8 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans1
Design loadHS 20
Structure length45 ft (13.7 m)
Longest span40 ft (12.2 m)
Deck width151 ft (46 m)
Roadway width98 ft (30 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic19,191 (2016)
Projected traffic29,140 by 2042
Trucks3%
Lanes on structure3
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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 Plummer ST over Santa Susana Creek built?

It was built in 1966, making it 59 years old in 2025.

What condition is Plummer ST over Santa Susana 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 October 2024.

How much traffic does Plummer ST over Santa Susana Creek carry?

About 19,191 vehicles per day (2016 count), of which roughly 3% are trucks.

How long is Plummer ST over Santa Susana Creek?

The structure is 45 ft (13.7 m) long with a longest span of 40 ft (12.2 m) and a deck 151 ft wide.

Who owns Plummer ST over Santa Susana Creek?

It is owned by the City or Municipal Highway Agency.