US Bridges

West ST over Humbug Gulch

Fair

Siskiyou County, California · 0.05 MI S/O Miner ST · Structure no. 02C0261

Built
1965
60 years old
Condition
Fair
inspected June 2024
Type
Slab
Concrete
Length
25 ft
1 main span
Daily traffic
165
2011 count
Owner
City
City or Municipal Highway Agency

About this bridge

West ST over Humbug Gulch is a concrete slab carrying West ST over Humbug Gulch in Siskiyou County, California. It was built in 1965, so it is 60 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 165 vehicles a day, projected to reach 413 by 2042. The structure is 25 ft (7.6 m) long and 37 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesWest ST
CrossesHumbug Gulch
Location0.05 MI S/O Miner ST
RouteCity Street 0
CountySiskiyou County
StateCalifornia
Coordinates41.73273, -122.64393
Functional classUrban 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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2024
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 geometry8: Equal to present desirable criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating44.6 US tons
Inventory rating26.8 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length25 ft (7.6 m)
Longest span23 ft (7 m)
Deck width37 ft (11.4 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic165 (2011)
Projected traffic413 by 2042
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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 West ST over Humbug Gulch built?

It was built in 1965, making it 60 years old in 2025.

What condition is West ST over Humbug 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 June 2024.

How much traffic does West ST over Humbug Gulch carry?

About 165 vehicles per day (2011 count).

How long is West ST over Humbug Gulch?

The structure is 25 ft (7.6 m) long with a longest span of 23 ft (7 m) and a deck 37 ft wide.

Who owns West ST over Humbug Gulch?

It is owned by the City or Municipal Highway Agency.