US Bridges

State Route 99 over Salt Creek

Fair

Tehama County, California · 02-TEH-099-24.84 · Structure no. 08 0019

Built
1924
101 years old, rebuilt 1947
Condition
Fair
inspected May 2024
Type
Tee Beam
Concrete
Length
103 ft
4 main spans
Daily traffic
11,000
2015 count
Owner
State
State Highway Agency

About this bridge

State Route 99 over Salt Creek is a concrete tee beam carrying State Route 99 over Salt Creek in Tehama County, California. It was built in 1924 and reconstructed in 1947, so it is 101 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 6 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 11,000 vehicles a day, roughly 12% of them trucks, projected to reach 15,361 by 2046. The structure is 103 ft (31.5 m) long and 31 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesState Route 99
CrossesSalt Creek
Location02-TEH-099-24.84
RouteState Highway 99
Coordinates40.18574, -122.18415
Functional classRural Principal Arterial - Other

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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating25 US tons
Inventory rating19.3 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans4
Design loadUnknown
Structure length103 ft (31.5 m)
Longest span26 ft (7.9 m)
Deck width31 ft (9.4 m)
Roadway width30 ft (9.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic11,000 (2015)
Projected traffic15,361 by 2046
Trucks12%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 State Route 99 over Salt Creek built?

It was built in 1924, making it 101 years old in 2025. It was reconstructed in 1947.

What condition is State Route 99 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 May 2024.

How much traffic does State Route 99 over Salt Creek carry?

About 11,000 vehicles per day (2015 count), of which roughly 12% are trucks.

How long is State Route 99 over Salt Creek?

The structure is 103 ft (31.5 m) long with a longest span of 26 ft (7.9 m) and a deck 31 ft wide.

Who owns State Route 99 over Salt Creek?

It is owned by the State Highway Agency.