US Bridges

Co. Rd. M4296 over W Branch of Cayucos Crk

Fair

San Luis Obispo County, California · 1 MI NW Cayucos RD · Structure no. 49C0385

Built
1960
65 years old
Condition
Fair
inspected July 2024
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
43 ft
2 main spans
Daily traffic
100
2018 count
Owner
County
County Highway Agency

About this bridge

Co. Rd. M4296 over W Branch of Cayucos Crk is a wood or timber stringer/multi-beam or girder carrying Co. Rd. M4296 over W Branch of Cayucos Crk in San Luis Obispo County, California. It was built in 1960, so it is 65 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 156 by 2044. The structure is 43 ft (13.1 m) long and 18 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

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CarriesCo. Rd. M4296
CrossesW Branch of Cayucos Crk
Location1 MI NW Cayucos RD
RouteCounty Highway 0
CountySan Luis Obispo County
StateCalifornia
Coordinates35.48204, -120.92401
Functional classRural 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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJuly 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 geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating31.1 US tons
Inventory rating22.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans2
Design loadH 15
Structure length43 ft (13.1 m)
Longest span21 ft (6.4 m)
Deck width18 ft (5.4 m)
Roadway width17 ft (5.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic100 (2018)
Projected traffic156 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 Co. Rd. M4296 over W Branch of Cayucos Crk built?

It was built in 1960, making it 65 years old in 2025.

What condition is Co. Rd. M4296 over W Branch of Cayucos Crk 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 July 2024.

How much traffic does Co. Rd. M4296 over W Branch of Cayucos Crk carry?

About 100 vehicles per day (2018 count), of which roughly 5% are trucks.

How long is Co. Rd. M4296 over W Branch of Cayucos Crk?

The structure is 43 ft (13.1 m) long with a longest span of 21 ft (6.4 m) and a deck 18 ft wide.

Who owns Co. Rd. M4296 over W Branch of Cayucos Crk?

It is owned by the County Highway Agency.