US Bridges

Lakeside Ave over Oceano Beach Lagoon

Fair

San Luis Obispo County, California · 0.1 MI S of Pier Ave · Structure no. 49C0126

Built
1940
85 years old, rebuilt 1992
Condition
Fair
inspected September 2024
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
144 ft
8 main spans
Daily traffic
100
2015 count
Owner
County
County Highway Agency

About this bridge

Lakeside Ave over Oceano Beach Lagoon is a wood or timber stringer/multi-beam or girder carrying Lakeside Ave over Oceano Beach Lagoon in San Luis Obispo County, California. It was built in 1940 and reconstructed in 1992, so it is 85 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 100 vehicles a day, roughly 5% of them trucks, projected to reach 154 by 2044. The structure is 144 ft (43.9 m) long and 20 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

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CarriesLakeside Ave
CrossesOceano Beach Lagoon
Location0.1 MI S of Pier Ave
RouteCounty Highway 0
CountySan Luis Obispo County
StateCalifornia
Coordinates35.10431, -120.62736
Functional classUrban Local

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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating50.4 US tons
Inventory rating36.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans8
Design loadUnknown
Structure length144 ft (43.9 m)
Longest span19 ft (5.8 m)
Deck width20 ft (6.1 m)
Roadway width20 ft (6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic100 (2015)
Projected traffic154 by 2044
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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 Lakeside Ave over Oceano Beach Lagoon built?

It was built in 1940, making it 85 years old in 2025. It was reconstructed in 1992.

What condition is Lakeside Ave over Oceano Beach Lagoon 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 2024.

How much traffic does Lakeside Ave over Oceano Beach Lagoon carry?

About 100 vehicles per day (2015 count), of which roughly 5% are trucks.

How long is Lakeside Ave over Oceano Beach Lagoon?

The structure is 144 ft (43.9 m) long with a longest span of 19 ft (5.8 m) and a deck 20 ft wide.

Who owns Lakeside Ave over Oceano Beach Lagoon?

It is owned by the County Highway Agency.