US Bridges

Blanchard Flat RD over Redding Creek

Fair

Trinity County, California · 3.9 MI S/O SR 3 · Structure no. 05C0045

Built
1969
56 years old, rebuilt 1980
Condition
Fair
inspected August 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
40 ft
1 main span
Daily traffic
25
2010 count
Owner
County
County Highway Agency

About this bridge

Blanchard Flat RD over Redding Creek is a steel stringer/multi-beam or girder carrying Blanchard Flat RD over Redding Creek in Trinity County, California. It was built in 1969 and reconstructed in 1980, so it is 56 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 25 vehicles a day, roughly 2% of them trucks, projected to reach 28 by 2042. The structure is 40 ft (12.2 m) long and 18 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

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CarriesBlanchard Flat RD
CrossesRedding Creek
Location3.9 MI S/O SR 3
RouteCounty Highway 0
CountyTrinity County
StateCalifornia
Coordinates40.59769, -122.905
Functional classRural Minor 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.
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 inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating28.2 US tons
Inventory rating16.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckSteel plate
Main spans1
Design loadUnknown
Structure length40 ft (12.2 m)
Longest span37 ft (11.3 m)
Deck width18 ft (5.4 m)
Roadway width17 ft (5.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic25 (2010)
Projected traffic28 by 2042
Trucks2%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed9.9 mi (16 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 Blanchard Flat RD over Redding Creek built?

It was built in 1969, making it 56 years old in 2025. It was reconstructed in 1980.

What condition is Blanchard Flat RD over Redding 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 August 2023.

How much traffic does Blanchard Flat RD over Redding Creek carry?

About 25 vehicles per day (2010 count), of which roughly 2% are trucks.

How long is Blanchard Flat RD over Redding Creek?

The structure is 40 ft (12.2 m) long with a longest span of 37 ft (11.3 m) and a deck 18 ft wide.

Who owns Blanchard Flat RD over Redding Creek?

It is owned by the County Highway Agency.