US Bridges

State Route 36 over Supan Gulch

Fair

Tehama County, California · 02-TEH-036-53.85 · Structure no. 08 0053

Built
1961
64 years old
Condition
Fair
inspected September 2024
Type
Slab
Concrete
Length
23 ft
1 main span
Daily traffic
2,025
2015 count
Owner
State
State Highway Agency

About this bridge

State Route 36 over Supan Gulch is a concrete slab carrying State Route 36 over Supan Gulch in Tehama County, California. It was built in 1961, so it is 64 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 2,025 vehicles a day, projected to reach 2,457 by 2046. The structure is 23 ft (6.9 m) long and 43 ft wide. If it were closed, the detour would be 64 mi (103 km).

Location

Open in Google Maps
CarriesState Route 36
CrossesSupan Gulch
Location02-TEH-036-53.85
RouteState Highway 36
CountyTehama County
StateCalifornia
Coordinates40.30293, -122.09197
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating73.2 US tons
Inventory rating44 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length23 ft (6.9 m)
Longest span22 ft (6.6 m)
Deck width43 ft (13 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,025 (2015)
Projected traffic2,457 by 2046
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed64 mi (103 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 Supan Gulch built?

It was built in 1961, making it 64 years old in 2025.

What condition is State Route 36 over Supan Gulch 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 September 2024.

How much traffic does State Route 36 over Supan Gulch carry?

About 2,025 vehicles per day (2015 count).

How long is State Route 36 over Supan Gulch?

The structure is 23 ft (6.9 m) long with a longest span of 22 ft (6.6 m) and a deck 43 ft wide.

Who owns State Route 36 over Supan Gulch?

It is owned by the State Highway Agency.