US Bridges

State Route 166 over Interstate 5 (@pm 19.61)

Good

Kern County, California · 06-KER-166-22.76 · Structure no. 50 0291

Built
1967
58 years old
Condition
Good
inspected April 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
345 ft
4 main spans
Daily traffic
2,100
2009 count
Owner
State
State Highway Agency

About this bridge

State Route 166 over Interstate 5 (@pm 19.61) is a steel continuous stringer/multi-beam or girder carrying State Route 166 over Interstate 5 (@pm 19.61) in Kern County, California. It was built in 1967, so it is 58 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 2,100 vehicles a day, roughly 23% of them trucks, projected to reach 3,265 by 2042. The structure is 345 ft (105.2 m) long and 44 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

CarriesState Route 166
CrossesInterstate 5 (@pm 19.61)
Location06-KER-166-22.76
RouteState Highway 166
Coordinates35.05929, -118.99969
Functional classRural Minor Arterial

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 inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating34.6 US tons
Inventory rating26.8 US tons

Structure

MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20 + Mod
Structure length345 ft (105.2 m)
Longest span137 ft (41.8 m)
Deck width44 ft (13.4 m)
Roadway width41 ft (12.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,100 (2009)
Projected traffic3,265 by 2042
Trucks23%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed6.8 mi (11 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 State Route 166 over Interstate 5 (@pm 19.61) built?

It was built in 1967, making it 58 years old in 2025.

What condition is State Route 166 over Interstate 5 (@pm 19.61) 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 April 2024.

How much traffic does State Route 166 over Interstate 5 (@pm 19.61) carry?

About 2,100 vehicles per day (2009 count), of which roughly 23% are trucks.

How long is State Route 166 over Interstate 5 (@pm 19.61)?

The structure is 345 ft (105.2 m) long with a longest span of 137 ft (41.8 m) and a deck 44 ft wide.

Who owns State Route 166 over Interstate 5 (@pm 19.61)?

It is owned by the State Highway Agency.