US Bridges

Asuncion Road over Trout Creek

Poor

San Luis Obispo County, California · 0.25 MI NE El Camino Real · Structure no. 49C0169

Built
1969
56 years old
Condition
Poor
inspected July 2024
Type
Culvert
Concrete Continuous
Length
25 ft
2 main spans
Daily traffic
371
2016 count
Owner
County
County Highway Agency

About this bridge

Asuncion Road over Trout Creek is a concrete continuous culvert carrying Asuncion Road over Trout Creek in San Luis Obispo County, California. It was built in 1969, so it is 56 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 371 vehicles a day, roughly 3% of them trucks, projected to reach 699 by 2044. The structure is 25 ft (7.5 m) long and 32 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

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CarriesAsuncion Road
CrossesTrout Creek
Location0.25 MI NE El Camino Real
RouteCounty Highway 0
CountySan Luis Obispo County
StateCalifornia
Coordinates35.43072, -120.60363
Functional classRural Local

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
Channel and channel protection8 Very GoodNo problems noted.
Culvert4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating44.6 US tons
Inventory rating26.8 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadUnknown
Structure length25 ft (7.5 m)
Longest span12 ft (3.7 m)
Deck width32 ft (9.9 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic371 (2016)
Projected traffic699 by 2044
Trucks3%
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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$129,000 (2025 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Asuncion Road over Trout Creek built?

It was built in 1969, making it 56 years old in 2025.

What condition is Asuncion Road over Trout Creek 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 July 2024.

How much traffic does Asuncion Road over Trout Creek carry?

About 371 vehicles per day (2016 count), of which roughly 3% are trucks.

How long is Asuncion Road over Trout Creek?

The structure is 25 ft (7.5 m) long with a longest span of 12 ft (3.7 m) and a deck 32 ft wide.

Who owns Asuncion Road over Trout Creek?

It is owned by the County Highway Agency.