US Bridges

Humbug RD over Yellow Creek

Fair

Plumas County, California · 7.8 MI W Humbg-Hmblt RD · Structure no. 09C0063

Built
1960
65 years old
Condition
Fair
inspected September 2023
Type
Slab
Concrete
Length
24 ft
1 main span
Daily traffic
35
2019 count
Owner
County
County Highway Agency

About this bridge

Humbug RD over Yellow Creek is a concrete slab carrying Humbug RD over Yellow Creek in Plumas County, California. It was built in 1960, so it is 65 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 35 vehicles a day, projected to reach 68 by 2044. The structure is 24 ft (7.3 m) long and 24 ft wide. If it were closed, the detour would be 19.3 mi (31 km).

Location

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CarriesHumbug RD
CrossesYellow Creek
Location7.8 MI W Humbg-Hmblt RD
RouteCounty Highway 0
CountyPlumas County
StateCalifornia
Coordinates40.14216, -121.26207
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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
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 adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating61.4 US tons
Inventory rating36.8 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 20
Structure length24 ft (7.3 m)
Longest span22 ft (6.7 m)
Deck width24 ft (7.3 m)
Roadway width22 ft (6.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic35 (2019)
Projected traffic68 by 2044
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed19.3 mi (31 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 Humbug RD over Yellow Creek built?

It was built in 1960, making it 65 years old in 2025.

What condition is Humbug RD over Yellow 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 September 2023.

How much traffic does Humbug RD over Yellow Creek carry?

About 35 vehicles per day (2019 count).

How long is Humbug RD over Yellow Creek?

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

Who owns Humbug RD over Yellow Creek?

It is owned by the County Highway Agency.