US Bridges

State Route 1 over Los Berros Creek

Fair

San Luis Obispo County, California · 05-SLO-001-10.35 · Structure no. 49 0022

Built
1952
73 years old
Condition
Fair
inspected September 2023
Type
Slab
Concrete Continuous
Length
90 ft
3 main spans
Daily traffic
6,200
2009 count
Owner
State
State Highway Agency

About this bridge

State Route 1 over Los Berros Creek is a concrete continuous slab carrying State Route 1 over Los Berros Creek in San Luis Obispo County, California. It was built in 1952, so it is 73 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 5 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 6,200 vehicles a day, roughly 6% of them trucks, projected to reach 3,938 by 2045. The structure is 90 ft (27.4 m) long and 32 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesState Route 1
CrossesLos Berros Creek
Location05-SLO-001-10.35
RouteState Highway 1
CountySan Luis Obispo County
StateCalifornia
Coordinates35.09788, -120.58163
Functional classUrban Other Principal 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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating74 US tons
Inventory rating44.6 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length90 ft (27.4 m)
Longest span37 ft (11.3 m)
Deck width32 ft (9.9 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,200 (2009)
Projected traffic3,938 by 2045
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
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—
NavigationNo navigation control on waterway

Frequently asked questions

When was State Route 1 over Los Berros Creek built?

It was built in 1952, making it 73 years old in 2025.

What condition is State Route 1 over Los Berros 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 September 2023.

How much traffic does State Route 1 over Los Berros Creek carry?

About 6,200 vehicles per day (2009 count), of which roughly 6% are trucks.

How long is State Route 1 over Los Berros Creek?

The structure is 90 ft (27.4 m) long with a longest span of 37 ft (11.3 m) and a deck 32 ft wide.

Who owns State Route 1 over Los Berros Creek?

It is owned by the State Highway Agency.