US Bridges

State Route 166 over San Emigdio Creek

Fair

Kern County, California · 06-KER-166-12.52 · Structure no. 50 0031

Built
1929
96 years old
Condition
Fair
inspected April 2024
Type
Culvert
Concrete Continuous
Length
22 ft
2 main spans
Daily traffic
3,300
2009 count
Owner
State
State Highway Agency

About this bridge

State Route 166 over San Emigdio Creek is a concrete continuous culvert carrying State Route 166 over San Emigdio Creek in Kern County, California. It was built in 1929, so it is 96 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 3,300 vehicles a day, roughly 31% of them trucks, projected to reach 4,772 by 2046. The structure is 22 ft (6.7 m) long and 43 ft wide. If it were closed, the detour would be 11.2 mi (18 km).

CarriesState Route 166
CrossesSan Emigdio Creek
Location06-KER-166-12.52
RouteState Highway 166
Coordinates35.05852, -119.18067
Functional classRural Minor Arterial

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 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating44.6 US tons
Inventory rating26.8 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadUnknown
Structure length22 ft (6.7 m)
Longest span10 ft (3 m)
Deck width43 ft (13.1 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,300 (2009)
Projected traffic4,772 by 2046
Trucks31%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed11.2 mi (18 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was State Route 166 over San Emigdio Creek built?

It was built in 1929, making it 96 years old in 2025.

What condition is State Route 166 over San Emigdio Creek 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 2024.

How much traffic does State Route 166 over San Emigdio Creek carry?

About 3,300 vehicles per day (2009 count), of which roughly 31% are trucks.

How long is State Route 166 over San Emigdio Creek?

The structure is 22 ft (6.7 m) long with a longest span of 10 ft (3 m) and a deck 43 ft wide.

Who owns State Route 166 over San Emigdio Creek?

It is owned by the State Highway Agency.