US Bridges

Bianchi Lane over San Luis Obispo Creek

Poor

San Luis Obispo County, California · 0.2 MI W/O Higuera Str · Structure no. 49C0381

Built
1905
120 years old
Condition
Poor
inspected April 2024
Type
Girder and Floorbeam System
Steel
Length
64 ft
1 main span
Daily traffic
30
2003 count
Owner
City
City or Municipal Highway Agency

About this bridge

Bianchi Lane over San Luis Obispo Creek is a steel girder and floorbeam system carrying Bianchi Lane over San Luis Obispo Creek in San Luis Obispo County, California. It was built in 1905, so it is 120 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 3 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. Its operating status is: open, would be posted or closed except for temporary shoring.

It carries about 30 vehicles a day, roughly 1% of them trucks, projected to reach 65 by 2044. The structure is 64 ft (19.5 m) long and 16 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

CarriesBianchi Lane
CrossesSan Luis Obispo Creek
Location0.2 MI W/O Higuera Str
RouteCity Street 0
Coordinates35.27245, -120.67101
Functional classUrban 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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionApril 2024
Inspection intervalevery 12 months
Operating statusOpen, would be posted or closed except for temporary shoring
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation2: Basically intolerable, requiring high priority of replacement
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating0 US tons
Inventory rating0 US tons

Structure

MaterialSteel
DeckWood or timber
Main spans1
Design loadUnknown
Structure length64 ft (19.5 m)
Longest span62 ft (18.8 m)
Deck width16 ft (4.9 m)
Roadway width10 ft (3.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic30 (2003)
Projected traffic65 by 2044
Trucks1%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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$367,000 (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Bianchi Lane over San Luis Obispo Creek built?

It was built in 1905, making it 120 years old in 2025.

What condition is Bianchi Lane over San Luis Obispo 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 April 2024.

How much traffic does Bianchi Lane over San Luis Obispo Creek carry?

About 30 vehicles per day (2003 count), of which roughly 1% are trucks.

How long is Bianchi Lane over San Luis Obispo Creek?

The structure is 64 ft (19.5 m) long with a longest span of 62 ft (18.8 m) and a deck 16 ft wide.

Who owns Bianchi Lane over San Luis Obispo Creek?

It is owned by the City or Municipal Highway Agency.