US Bridges

US Highway 101 NB over ST RTE 166 (@pm 8.93)

Fair

San Luis Obispo County, California · 05-SLO-101-0.80 · Structure no. 49 0121R

Built
1962
63 years old
Condition
Fair
inspected January 2024
Type
Tee Beam
Concrete Continuous
Length
113 ft
3 main spans
Daily traffic
25,500
2009 count
Owner
State
State Highway Agency

About this bridge

US Highway 101 NB over ST RTE 166 (@pm 8.93) is a concrete continuous tee beam carrying US Highway 101 NB over ST RTE 166 (@pm 8.93) in San Luis Obispo County, California. It was built in 1962, so it is 63 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 25,500 vehicles a day, projected to reach 51,047 by 2046. The structure is 113 ft (34.3 m) long and 40 ft wide.

Location

Open in Google Maps
CarriesUS Highway 101 NB
CrossesST RTE 166 (@pm 8.93)
Location05-SLO-101-0.80
RouteU.S. Route 101
CountySan Luis Obispo County
StateCalifornia
Coordinates34.99612, -120.43452
Functional classRural Principal Arterial - Other

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionJanuary 2024
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating57.5 US tons
Inventory rating44.3 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length113 ft (34.3 m)
Longest span47 ft (14.3 m)
Deck width40 ft (12.1 m)
Roadway width37 ft (11.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic25,500 (2009)
Projected traffic51,047 by 2046
Trucks0%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed—
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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 US Highway 101 NB over ST RTE 166 (@pm 8.93) built?

It was built in 1962, making it 63 years old in 2025.

What condition is US Highway 101 NB over ST RTE 166 (@pm 8.93) 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 January 2024.

How much traffic does US Highway 101 NB over ST RTE 166 (@pm 8.93) carry?

About 25,500 vehicles per day (2009 count).

How long is US Highway 101 NB over ST RTE 166 (@pm 8.93)?

The structure is 113 ft (34.3 m) long with a longest span of 47 ft (14.3 m) and a deck 40 ft wide.

Who owns US Highway 101 NB over ST RTE 166 (@pm 8.93)?

It is owned by the State Highway Agency.