US Bridges

Lassen RD over Singer Creek

Fair

Tehama County, California · 2.9 MI E Highway 99 · Structure no. 08C0073

Built
1938
87 years old
Condition
Fair
inspected November 2024
Type
Truss - Thru
Steel
Length
216 ft
3 main spans
Daily traffic
60
2010 count
Owner
County
County Highway Agency

About this bridge

Lassen RD over Singer Creek is a steel truss - thru carrying Lassen RD over Singer Creek in Tehama County, California. It was built in 1938, so it is 87 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 60 vehicles a day, projected to reach 205 by 2042. The structure is 216 ft (65.8 m) long and 23 ft wide. If it were closed, the detour would be 11.8 mi (19 km).

Location

Open in Google Maps
CarriesLassen RD
CrossesSinger Creek
Location2.9 MI E Highway 99
RouteCounty Highway 0
CountyTehama County
StateCalifornia
Coordinates39.91244, -121.95718
Functional classRural Major 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
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating29.7 US tons
Inventory rating17.9 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadUnknown
Structure length216 ft (65.8 m)
Longest span70 ft (21.3 m)
Deck width23 ft (7.1 m)
Roadway width21 ft (6.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic60 (2010)
Projected traffic205 by 2042
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed11.8 mi (19 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 Lassen RD over Singer Creek built?

It was built in 1938, making it 87 years old in 2025.

What condition is Lassen RD over Singer 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 November 2024.

How much traffic does Lassen RD over Singer Creek carry?

About 60 vehicles per day (2010 count).

How long is Lassen RD over Singer Creek?

The structure is 216 ft (65.8 m) long with a longest span of 70 ft (21.3 m) and a deck 23 ft wide.

Who owns Lassen RD over Singer Creek?

It is owned by the County Highway Agency.