US Bridges

Big Canyon Road over Big Canyon Creek

Poor

Lake County, California · 8 MI N of SR 175 · Structure no. 14C0114

Built
1930
95 years old, rebuilt 1993
Condition
Poor
inspected March 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
24 ft
1 main span
Daily traffic
308
2008 count
Owner
County
County Highway Agency

About this bridge

Big Canyon Road over Big Canyon Creek is a steel stringer/multi-beam or girder carrying Big Canyon Road over Big Canyon Creek in Lake County, California. It was built in 1930 and reconstructed in 1993, so it is 95 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 308 vehicles a day, roughly 2% of them trucks, projected to reach 437 by 2044. The structure is 24 ft (7.3 m) long and 25 ft wide. If it were closed, the detour would be 24.2 mi (39 km).

CarriesBig Canyon Road
CrossesBig Canyon Creek
Location8 MI N of SR 175
RouteCounty Highway 0
Coordinates38.84507, -122.65937
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
Deck7 GoodSome minor problems.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating66 US tons
Inventory rating39.7 US tons

Structure

MaterialSteel
DeckCorrugated steel
Main spans1
Design loadUnknown
Structure length24 ft (7.3 m)
Longest span22 ft (6.7 m)
Deck width25 ft (7.6 m)
Roadway width25 ft (7.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic308 (2008)
Projected traffic437 by 2044
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed24.2 mi (39 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$94,000 (2018 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was Big Canyon Road over Big Canyon Creek built?

It was built in 1930, making it 95 years old in 2025. It was reconstructed in 1993.

What condition is Big Canyon Road over Big Canyon 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 March 2024.

How much traffic does Big Canyon Road over Big Canyon Creek carry?

About 308 vehicles per day (2008 count), of which roughly 2% are trucks.

How long is Big Canyon Road over Big Canyon Creek?

The structure is 24 ft (7.3 m) long with a longest span of 22 ft (6.7 m) and a deck 25 ft wide.

Who owns Big Canyon Road over Big Canyon Creek?

It is owned by the County Highway Agency.