US Bridges

Long Ridge Road over Salt Creek

Fair

Trinity County, California · 2 MI E JCT Hoaglin RD · Structure no. 05C0147

Built
1950
75 years old, rebuilt 1990
Condition
Fair
inspected June 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
104 ft
3 main spans
Daily traffic
15
2009 count
Owner
County
County Highway Agency

About this bridge

Long Ridge Road over Salt Creek is a steel stringer/multi-beam or girder carrying Long Ridge Road over Salt Creek in Trinity County, California. It was built in 1950 and reconstructed in 1990, so it is 75 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 15 vehicles a day, roughly 1% of them trucks, projected to reach 16 by 2042. The structure is 104 ft (31.7 m) long and 20 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

CarriesLong Ridge Road
CrossesSalt Creek
Location2 MI E JCT Hoaglin RD
RouteCounty Highway 0
Coordinates40.13008, -123.36738
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
Deck7 GoodSome minor problems.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating62.8 US tons
Inventory rating37.5 US tons

Structure

MaterialSteel
DeckCorrugated steel
Main spans3
Design loadUnknown
Structure length104 ft (31.7 m)
Longest span54 ft (16.5 m)
Deck width20 ft (6.2 m)
Roadway width20 ft (6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic15 (2009)
Projected traffic16 by 2042
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 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 Long Ridge Road over Salt Creek built?

It was built in 1950, making it 75 years old in 2025. It was reconstructed in 1990.

What condition is Long Ridge 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 Long Ridge Road over Salt Creek carry?

About 15 vehicles per day (2009 count), of which roughly 1% are trucks.

How long is Long Ridge Road over Salt Creek?

The structure is 104 ft (31.7 m) long with a longest span of 54 ft (16.5 m) and a deck 20 ft wide.

Who owns Long Ridge Road over Salt Creek?

It is owned by the County Highway Agency.