US Bridges

Huasna RD over Arroyo Grande Creek

Poor

San Luis Obispo County, California · 0.04 MI SE Lopez DR · Structure no. 49C0124

Built
1923
102 years old
Condition
Poor
inspected July 2023
Type
Tee Beam
Concrete
Length
45 ft
1 main span
Daily traffic
966
2010 count
Owner
County
County Highway Agency

About this bridge

Huasna RD over Arroyo Grande Creek is a concrete tee beam carrying Huasna RD over Arroyo Grande Creek in San Luis Obispo County, California. It was built in 1923, so it is 102 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 966 vehicles a day, roughly 4% of them trucks, projected to reach 2,164 by 2041. The structure is 45 ft (13.7 m) long and 21 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

CarriesHuasna RD
CrossesArroyo Grande Creek
Location0.04 MI SE Lopez DR
RouteCounty Highway 0
Coordinates35.13923, -120.54697
Functional classRural Major Collector

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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
Last inspectionJuly 2023
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 geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating28.9 US tons
Inventory rating22.5 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length45 ft (13.7 m)
Longest span42 ft (12.8 m)
Deck width21 ft (6.5 m)
Roadway width20 ft (6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic966 (2010)
Projected traffic2,164 by 2041
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$347,000 (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Huasna RD over Arroyo Grande Creek built?

It was built in 1923, making it 102 years old in 2025.

What condition is Huasna RD over Arroyo Grande 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 2023.

How much traffic does Huasna RD over Arroyo Grande Creek carry?

About 966 vehicles per day (2010 count), of which roughly 4% are trucks.

How long is Huasna RD over Arroyo Grande Creek?

The structure is 45 ft (13.7 m) long with a longest span of 42 ft (12.8 m) and a deck 21 ft wide.

Who owns Huasna RD over Arroyo Grande Creek?

It is owned by the County Highway Agency.