US Bridges

Slater Avenue over Route 405

Good

Orange County, California · 12-ORA-405-14.13-FNV · Structure no. 55 1122

Built
2019
6 years old
Condition
Good
inspected August 2023
Type
Box Beam or Girders - Multiple
Concrete Continuous
Length
330 ft
2 main spans
Daily traffic
20,000
2016 count
Owner
State
State Highway Agency

About this bridge

Slater Avenue over Route 405 is a concrete continuous box beam or girders - multiple carrying Slater Avenue over Route 405 in Orange County, California. It was built in 2019, so it is 6 years old, younger 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 20,000 vehicles a day, roughly 3% of them trucks, projected to reach 11,797 by 2040. The structure is 330 ft (100.5 m) long and 72 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesSlater Avenue
CrossesRoute 405
Location12-ORA-405-14.13-FNV
RouteCity Street 0M029
CountyOrange County
StateCalifornia
Coordinates33.70883, -117.95906
Functional classUrban Collector

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.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment7: Better than present minimum criteria
Operating rating46.4 US tons
Inventory rating35.7 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadGreater than HL 93
Structure length330 ft (100.5 m)
Longest span174 ft (53.1 m)
Deck width72 ft (21.9 m)
Roadway width58 ft (17.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic20,000 (2016)
Projected traffic11,797 by 2040
Trucks3%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Slater Avenue over Route 405 built?

It was built in 2019, making it 6 years old in 2025.

What condition is Slater Avenue over Route 405 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 August 2023.

How much traffic does Slater Avenue over Route 405 carry?

About 20,000 vehicles per day (2016 count), of which roughly 3% are trucks.

How long is Slater Avenue over Route 405?

The structure is 330 ft (100.5 m) long with a longest span of 174 ft (53.1 m) and a deck 72 ft wide.

Who owns Slater Avenue over Route 405?

It is owned by the State Highway Agency.