US Bridges

Mill Ck Ridge Road over Trib to Mill Creek

Good

Siskiyou County, California · Indian · Structure no. 050552000001056

Built
1967
58 years old
Condition
Good
inspected September 2024
Type
Slab
Concrete
Length
38 ft
1 main span
Daily traffic
50
Owner
Federal
U.S. Forest Service

About this bridge

Mill Ck Ridge Road over Trib to Mill Creek is a concrete slab carrying Mill Ck Ridge Road over Trib to Mill Creek in Siskiyou County, California. It was built in 1967, so it is 58 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 38 ft (11.5 m) long and 17 ft wide.

CarriesMill Ck Ridge Road
CrossesTrib to Mill Creek
LocationIndian
RouteFederal Lands Road 18N24
Coordinates41.94353, -123.45955
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 protection7 GoodSome minor problems.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation*: *
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating—
Inventory rating—

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length38 ft (11.5 m)
Longest span34 ft (10.4 m)
Deck width17 ft (5.1 m)
Roadway width14 ft (4.3 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 Mill Ck Ridge Road over Trib to Mill Creek built?

It was built in 1967, making it 58 years old in 2025.

What condition is Mill Ck Ridge Road over Trib to Mill Creek 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 September 2024.

How much traffic does Mill Ck Ridge Road over Trib to Mill Creek carry?

About 50 vehicles per day (latest count).

How long is Mill Ck Ridge Road over Trib to Mill Creek?

The structure is 38 ft (11.5 m) long with a longest span of 34 ft (10.4 m) and a deck 17 ft wide.

Who owns Mill Ck Ridge Road over Trib to Mill Creek?

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