US Bridges

Rattlesnake Road over Salt Creek

Fair

Trinity County, California · 150 West of S.R. 3 · Structure no. 05C0200

Built
1966
59 years old
Condition
Fair
inspected June 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
62 ft
1 main span
Daily traffic
440
2000 count
Owner
County
County Highway Agency

About this bridge

Rattlesnake Road over Salt Creek is a steel stringer/multi-beam or girder carrying Rattlesnake Road over Salt Creek in Trinity County, California. It was built in 1966, so it is 59 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 440 vehicles a day, roughly 2% of them trucks, projected to reach 530 by 2042. The structure is 62 ft (19 m) long and 25 ft wide. If it were closed, the detour would be 18 mi (29 km).

Location

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CarriesRattlesnake Road
CrossesSalt Creek
Location150 West of S.R. 3
RouteCounty Highway 0
CountyTrinity County
StateCalifornia
Coordinates40.46706, -123.17013
Functional classRural Minor Collector

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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating65.7 US tons
Inventory rating39.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length62 ft (19 m)
Longest span59 ft (18.1 m)
Deck width25 ft (7.5 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic440 (2000)
Projected traffic530 by 2042
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed18 mi (29 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 Rattlesnake Road over Salt Creek built?

It was built in 1966, making it 59 years old in 2025.

What condition is Rattlesnake Road over Salt 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 June 2023.

How much traffic does Rattlesnake Road over Salt Creek carry?

About 440 vehicles per day (2000 count), of which roughly 2% are trucks.

How long is Rattlesnake Road over Salt Creek?

The structure is 62 ft (19 m) long with a longest span of 59 ft (18.1 m) and a deck 25 ft wide.

Who owns Rattlesnake Road over Salt Creek?

It is owned by the County Highway Agency.