US Bridges

San Ramon Road over US Highway 101

Poor

San Luis Obispo County, California · 05-SLO-101-49.32 · Structure no. 49 0193

Built
1967
58 years old
Condition
Poor
inspected May 2023
Type
Box Beam or Girders - Multiple
Concrete Continuous
Length
274 ft
4 main spans
Daily traffic
1,000
2009 count
Owner
State
State Highway Agency

About this bridge

San Ramon Road over US Highway 101 is a concrete continuous box beam or girders - multiple carrying San Ramon Road over US Highway 101 in San Luis Obispo 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 poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 1,000 vehicles a day, roughly 4% of them trucks, projected to reach 1,647 by 2043. The structure is 274 ft (83.5 m) long and 37 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesSan Ramon Road
CrossesUS Highway 101
Location05-SLO-101-49.32
RouteCounty Highway 0Y052
Coordinates35.52631, -120.70489
Functional classRural Principal Arterial - Other

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionMay 2023
Inspection intervalevery 24 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 alignment8: Equal to present desirable criteria
Operating rating40.3 US tons
Inventory rating31.1 US tons

Structure

MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length274 ft (83.5 m)
Longest span100 ft (30.5 m)
Deck width37 ft (11.3 m)
Roadway width30 ft (9.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,000 (2009)
Projected traffic1,647 by 2043
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

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 San Ramon Road over US Highway 101 built?

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

What condition is San Ramon Road over US Highway 101 in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in May 2023.

How much traffic does San Ramon Road over US Highway 101 carry?

About 1,000 vehicles per day (2009 count), of which roughly 4% are trucks.

How long is San Ramon Road over US Highway 101?

The structure is 274 ft (83.5 m) long with a longest span of 100 ft (30.5 m) and a deck 37 ft wide.

Who owns San Ramon Road over US Highway 101?

It is owned by the State Highway Agency.