US Bridges

Carbondale Road over Willow Creek

Fair

Amador County, California · 0.9 MI S Old Lambert RD · Structure no. 26C0017

Built
1970
55 years old
Condition
Fair
inspected April 2024
Type
Slab
Concrete Continuous
Length
93 ft
3 main spans
Daily traffic
250
2014 count
Owner
County
County Highway Agency

About this bridge

Carbondale Road over Willow Creek is a concrete continuous slab carrying Carbondale Road over Willow Creek in Amador County, California. It was built in 1970, so it is 55 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 250 vehicles a day, roughly 7% of them trucks, projected to reach 434 by 2042. The structure is 93 ft (28.3 m) long and 29 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

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CarriesCarbondale Road
CrossesWillow Creek
Location0.9 MI S Old Lambert RD
RouteCounty Highway 0
CountyAmador County
StateCalifornia
Coordinates38.41117, -121.00933
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionApril 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 adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating35.7 US tons
Inventory rating21.4 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadUnknown
Structure length93 ft (28.3 m)
Longest span36 ft (11 m)
Deck width29 ft (8.7 m)
Roadway width27 ft (8.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic250 (2014)
Projected traffic434 by 2042
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.8 mi (11 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 Carbondale Road over Willow Creek built?

It was built in 1970, making it 55 years old in 2025.

What condition is Carbondale Road over Willow Creek 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 April 2024.

How much traffic does Carbondale Road over Willow Creek carry?

About 250 vehicles per day (2014 count), of which roughly 7% are trucks.

How long is Carbondale Road over Willow Creek?

The structure is 93 ft (28.3 m) long with a longest span of 36 ft (11 m) and a deck 29 ft wide.

Who owns Carbondale Road over Willow Creek?

It is owned by the County Highway Agency.