US Bridges

Stc 4805;CEDAR Rdg over Potlatch River

Fair

Latah County, Idaho · 1.6 N. 4.1 E. Kendrick · Structure no. 000000000029586

Built
1992
33 years old
Condition
Fair
inspected June 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
153 ft
2 main spans
Daily traffic
320
2023 count
Owner
Local
Other Local Agency

About this bridge

Stc 4805;CEDAR Rdg over Potlatch River is a prestressed concrete stringer/multi-beam or girder carrying Stc 4805;CEDAR Rdg over Potlatch River in Latah County, Idaho. It was built in 1992, so it is 33 years old, younger than the Idaho average of 45.3 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 320 vehicles a day, roughly 28% of them trucks, projected to reach 480 by 2042. The structure is 153 ft (46.6 m) long and 32 ft wide. If it were closed, the detour would be 24.9 mi (40 km).

Location

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CarriesStc 4805;CEDAR Rdg
CrossesPotlatch River
Location1.6 N. 4.1 E. Kendrick
RouteCounty Highway 4805
CountyLatah County
StateIdaho
Coordinates46.63708, -116.56981
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating72 US tons
Inventory rating36 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length153 ft (46.6 m)
Longest span73 ft (22.3 m)
Deck width32 ft (9.8 m)
Roadway width29 ft (8.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic320 (2023)
Projected traffic480 by 2042
Trucks28%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed24.9 mi (40 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerOther Local Agency
Maintained byOther Local Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Stc 4805;CEDAR Rdg over Potlatch River built?

It was built in 1992, making it 33 years old in 2025.

What condition is Stc 4805;CEDAR Rdg over Potlatch River 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 June 2023.

How much traffic does Stc 4805;CEDAR Rdg over Potlatch River carry?

About 320 vehicles per day (2023 count), of which roughly 28% are trucks.

How long is Stc 4805;CEDAR Rdg over Potlatch River?

The structure is 153 ft (46.6 m) long with a longest span of 73 ft (22.3 m) and a deck 32 ft wide.

Who owns Stc 4805;CEDAR Rdg over Potlatch River?

It is owned by the Other Local Agency.