US Bridges

Moonstone Beach DR over Leffingwell Creek

Fair

San Luis Obispo County, California · South of State Park RD · Structure no. 49C0448

Built
2011
14 years old
Condition
Fair
inspected May 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete Continuous
Length
295 ft
3 main spans
Daily traffic
500
2012 count
Owner
County
County Highway Agency

About this bridge

Moonstone Beach DR over Leffingwell Creek is a prestressed concrete continuous box beam or girders - multiple carrying Moonstone Beach DR over Leffingwell Creek in San Luis Obispo County, California. It was built in 2011, so it is 14 years old, younger 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 500 vehicles a day, roughly 1% of them trucks, projected to reach 977 by 2041. The structure is 295 ft (90 m) long and 43 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesMoonstone Beach DR
CrossesLeffingwell Creek
LocationSouth of State Park RD
RouteCounty Highway 0
CountySan Luis Obispo County
StateCalifornia
Coordinates35.58128, -121.11846
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.
Channel and channel protection9 ExcellentNo problems noted.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry8: Equal to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.6 US tons
Inventory rating35.7 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length295 ft (90 m)
Longest span131 ft (40 m)
Deck width43 ft (13.2 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic500 (2012)
Projected traffic977 by 2041
Trucks1%
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

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 Moonstone Beach DR over Leffingwell Creek built?

It was built in 2011, making it 14 years old in 2025.

What condition is Moonstone Beach DR over Leffingwell 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 May 2023.

How much traffic does Moonstone Beach DR over Leffingwell Creek carry?

About 500 vehicles per day (2012 count), of which roughly 1% are trucks.

How long is Moonstone Beach DR over Leffingwell Creek?

The structure is 295 ft (90 m) long with a longest span of 131 ft (40 m) and a deck 43 ft wide.

Who owns Moonstone Beach DR over Leffingwell Creek?

It is owned by the County Highway Agency.