US Bridges

Carbondale Road over Willow Creek

Fair

Amador County, California · E Forest Home RD · Structure no. 26C0030

Built
1940
85 years old
Condition
Fair
inspected April 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
36 ft
2 main spans
Daily traffic
225
2014 count
Owner
County
County Highway Agency

About this bridge

Carbondale Road over Willow Creek is a steel continuous stringer/multi-beam or girder carrying Carbondale Road over Willow Creek in Amador County, California. It was built in 1940, so it is 85 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 225 vehicles a day, roughly 3% of them trucks, projected to reach 364 by 2042. The structure is 36 ft (11 m) long and 20 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

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CarriesCarbondale Road
CrossesWillow Creek
LocationE Forest Home RD
RouteCounty Highway 0
CountyAmador County
StateCalifornia
Coordinates38.44813, -120.96316
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.
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 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating52.1 US tons
Inventory rating31.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadUnknown
Structure length36 ft (11 m)
Longest span17 ft (5.2 m)
Deck width20 ft (6.1 m)
Roadway width19 ft (5.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic225 (2014)
Projected traffic364 by 2042
Trucks3%
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 1940, making it 85 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 225 vehicles per day (2014 count), of which roughly 3% are trucks.

How long is Carbondale Road over Willow Creek?

The structure is 36 ft (11 m) long with a longest span of 17 ft (5.2 m) and a deck 20 ft wide.

Who owns Carbondale Road over Willow Creek?

It is owned by the County Highway Agency.