US Bridges

Hogsback Road over Unnamed Stream

Fair

Tehama County, California · 1.1 MI E/O SR 99 · Structure no. 08C0232

Built
1928
97 years old, rebuilt 1977
Condition
Fair
inspected April 2024
Type
Girder and Floorbeam System
Steel Continuous
Length
38 ft
2 main spans
Daily traffic
84
2010 count
Owner
County
County Highway Agency

About this bridge

Hogsback Road over Unnamed Stream is a steel continuous girder and floorbeam system carrying Hogsback Road over Unnamed Stream in Tehama County, California. It was built in 1928 and reconstructed in 1977, so it is 97 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 84 vehicles a day, roughly 5% of them trucks, projected to reach 312 by 2046. The structure is 38 ft (11.6 m) long and 19 ft wide. If it were closed, the detour would be 52.2 mi (84 km).

Location

Open in Google Maps
CarriesHogsback Road
CrossesUnnamed Stream
Location1.1 MI E/O SR 99
RouteCounty Highway 0
CountyTehama County
StateCalifornia
Coordinates40.19368, -122.16195
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.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
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 adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating40 US tons
Inventory rating23.9 US tons

Structure

Structure typeGirder and Floorbeam System
MaterialSteel Continuous
DeckClosed grating
Main spans2
Design loadUnknown
Structure length38 ft (11.6 m)
Longest span17 ft (5.2 m)
Deck width19 ft (5.9 m)
Roadway width19 ft (5.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic84 (2010)
Projected traffic312 by 2046
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed52.2 mi (84 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 Hogsback Road over Unnamed Stream built?

It was built in 1928, making it 97 years old in 2025. It was reconstructed in 1977.

What condition is Hogsback Road over Unnamed Stream 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 April 2024.

How much traffic does Hogsback Road over Unnamed Stream carry?

About 84 vehicles per day (2010 count), of which roughly 5% are trucks.

How long is Hogsback Road over Unnamed Stream?

The structure is 38 ft (11.6 m) long with a longest span of 17 ft (5.2 m) and a deck 19 ft wide.

Who owns Hogsback Road over Unnamed Stream?

It is owned by the County Highway Agency.