US Bridges

State Route 36 over Robbers Creek

Fair

Lassen County, California · 02-LAS-036-3.15 · Structure no. 07 0008

Built
1924
101 years old, rebuilt 1971
Condition
Fair
inspected May 2023
Type
Tee Beam
Concrete
Length
36 ft
1 main span
Daily traffic
2,300
2009 count
Owner
State
State Highway Agency

About this bridge

State Route 36 over Robbers Creek is a concrete tee beam carrying State Route 36 over Robbers Creek in Lassen County, California. It was built in 1924 and reconstructed in 1971, 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 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 2,300 vehicles a day, roughly 14% of them trucks, projected to reach 4,081 by 2040. The structure is 36 ft (11 m) long and 42 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesState Route 36
CrossesRobbers Creek
Location02-LAS-036-3.15
RouteState Highway 36
CountyLassen County
StateCalifornia
Coordinates40.31453, -121.00368
Functional classRural Minor Arterial

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 protection7 GoodSome minor problems.
Last inspectionMay 2023
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 geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating57.5 US tons
Inventory rating44.3 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 15
Structure length36 ft (11 m)
Longest span36 ft (10.9 m)
Deck width42 ft (12.8 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,300 (2009)
Projected traffic4,081 by 2040
Trucks14%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemNo

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 36 over Robbers Creek built?

It was built in 1924, making it 101 years old in 2025. It was reconstructed in 1971.

What condition is State Route 36 over Robbers 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 2023.

How much traffic does State Route 36 over Robbers Creek carry?

About 2,300 vehicles per day (2009 count), of which roughly 14% are trucks.

How long is State Route 36 over Robbers Creek?

The structure is 36 ft (11 m) long with a longest span of 36 ft (10.9 m) and a deck 42 ft wide.

Who owns State Route 36 over Robbers Creek?

It is owned by the State Highway Agency.