US Bridges

French Gulch Road over French Gulch

Fair

Shasta County, California · 2.3 MI Nw/O Trinity Mt RD · Structure no. 06C0285

Built
1935
90 years old
Condition
Fair
inspected August 2024
Type
Culvert
Concrete Continuous
Length
26 ft
2 main spans
Daily traffic
60
2013 count
Owner
County
County Highway Agency

About this bridge

French Gulch Road over French Gulch is a concrete continuous culvert carrying French Gulch Road over French Gulch in Shasta County, California. It was built in 1935, so it is 90 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 5 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 60 vehicles a day, roughly 5% of them trucks, projected to reach 62 by 2044. The structure is 26 ft (7.9 m) long and 22 ft wide. If it were closed, the detour would be 11.8 mi (19 km).

Location

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CarriesFrench Gulch Road
CrossesFrench Gulch
Location2.3 MI Nw/O Trinity Mt RD
RouteCounty Highway 0
CountyShasta County
StateCalifornia
Coordinates40.71521, -122.6706
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
Channel and channel protection4 PoorAdvanced section loss, deterioration, spalling or scour.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being 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 alignment6: Equal to present minimum criteria
Operating rating30 US tons
Inventory rating17.9 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadUnknown
Structure length26 ft (7.9 m)
Longest span12 ft (3.7 m)
Deck width22 ft (6.8 m)
Roadway width20 ft (6.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic60 (2013)
Projected traffic62 by 2044
Trucks5%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed11.8 mi (19 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 French Gulch Road over French Gulch built?

It was built in 1935, making it 90 years old in 2025.

What condition is French Gulch Road over French Gulch 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 August 2024.

How much traffic does French Gulch Road over French Gulch carry?

About 60 vehicles per day (2013 count), of which roughly 5% are trucks.

How long is French Gulch Road over French Gulch?

The structure is 26 ft (7.9 m) long with a longest span of 12 ft (3.7 m) and a deck 22 ft wide.

Who owns French Gulch Road over French Gulch?

It is owned by the County Highway Agency.