US Bridges

State Route 36 over Upper Rattlesnake Creek

Fair

Trinity County, California · 02-TRI-036-20.42 · Structure no. 05 0073

Built
1970
55 years old
Condition
Fair
inspected March 2023
Type
Box Beam or Girders - Multiple
Concrete Continuous
Length
350 ft
3 main spans
Daily traffic
560
2009 count
Owner
State
State Highway Agency

About this bridge

State Route 36 over Upper Rattlesnake Creek is a concrete continuous box beam or girders - multiple carrying State Route 36 over Upper Rattlesnake Creek in Trinity County, California. It was built in 1970, so it is 55 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 560 vehicles a day, projected to reach 409 by 2040. The structure is 350 ft (106.7 m) long and 34 ft wide. If it were closed, the detour would be 13 mi (21 km).

Location

Open in Google Maps
CarriesState Route 36
CrossesUpper Rattlesnake Creek
Location02-TRI-036-20.42
RouteState Highway 36
CountyTrinity County
StateCalifornia
Coordinates40.39097, -123.27654
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMarch 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 adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.6 US tons
Inventory rating41.4 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length350 ft (106.7 m)
Longest span140 ft (42.7 m)
Deck width34 ft (10.3 m)
Roadway width33 ft (10.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic560 (2009)
Projected traffic409 by 2040
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed13 mi (21 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 Upper Rattlesnake Creek built?

It was built in 1970, making it 55 years old in 2025.

What condition is State Route 36 over Upper Rattlesnake 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 March 2023.

How much traffic does State Route 36 over Upper Rattlesnake Creek carry?

About 560 vehicles per day (2009 count).

How long is State Route 36 over Upper Rattlesnake Creek?

The structure is 350 ft (106.7 m) long with a longest span of 140 ft (42.7 m) and a deck 34 ft wide.

Who owns State Route 36 over Upper Rattlesnake Creek?

It is owned by the State Highway Agency.