US Bridges

Rock Shanty Road over Bark Shanty Gulch

Good

Siskiyou County, California · Ukonom · Structure no. 050558000001054

Built
1960
65 years old
Condition
Good
inspected October 2023
Type
Stringer/Multi-beam or Girder
Concrete
Length
114 ft
3 main spans
Daily traffic
50
Owner
Federal
U.S. Forest Service

About this bridge

Rock Shanty Road over Bark Shanty Gulch is a concrete stringer/multi-beam or girder carrying Rock Shanty Road over Bark Shanty Gulch in Siskiyou 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 good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 50 vehicles a day, projected to reach 75 by 2045. The structure is 114 ft (34.6 m) long and 28 ft wide.

CarriesRock Shanty Road
CrossesBark Shanty Gulch
LocationUkonom
RouteFederal Lands Road 13N13
Coordinates41.4794, -123.55516
Functional classRural Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation*: *
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating—
Inventory rating—

Structure

MaterialConcrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length114 ft (34.6 m)
Longest span53 ft (16.2 m)
Deck width28 ft (8.4 m)
Roadway width24 ft (7.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (—)
Projected traffic75 by 2045
Trucks—
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerU.S. Forest Service
Maintained byU.S. Forest Service
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Rock Shanty Road over Bark Shanty Gulch built?

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

What condition is Rock Shanty Road over Bark Shanty Gulch in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in October 2023.

How much traffic does Rock Shanty Road over Bark Shanty Gulch carry?

About 50 vehicles per day (latest count).

How long is Rock Shanty Road over Bark Shanty Gulch?

The structure is 114 ft (34.6 m) long with a longest span of 53 ft (16.2 m) and a deck 28 ft wide.

Who owns Rock Shanty Road over Bark Shanty Gulch?

It is owned by the U.S. Forest Service.