US Bridges

STC3854;BLK Brdg over Payette River

Fair

Payette County, Idaho · 2.0 N. New Plymouth Ncl · Structure no. 000000000019980

Built
1963
62 years old
Condition
Fair
inspected June 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
340 ft
6 main spans
Daily traffic
650
2023 count
Owner
Local
Other Local Agency

About this bridge

STC3854;BLK Brdg over Payette River is a prestressed concrete stringer/multi-beam or girder carrying STC3854;BLK Brdg over Payette River in Payette County, Idaho. It was built in 1963, so it is 62 years old, older 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 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 650 vehicles a day, roughly 30% of them trucks, projected to reach 975 by 2042. The structure is 340 ft (103.6 m) long and 29 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesSTC3854;BLK Brdg
CrossesPayette River
Location2.0 N. New Plymouth Ncl
RouteCounty Highway 3854
CountyPayette County
StateIdaho
Coordinates43.98997, -116.79653
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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
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 evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating52 US tons
Inventory rating31 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans6
Design loadHS 15
Structure length340 ft (103.6 m)
Longest span55 ft (16.8 m)
Deck width29 ft (8.9 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic650 (2023)
Projected traffic975 by 2042
Trucks30%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$3.1 million (2023 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was STC3854;BLK Brdg over Payette River built?

It was built in 1963, making it 62 years old in 2025.

What condition is STC3854;BLK Brdg over Payette 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 STC3854;BLK Brdg over Payette River carry?

About 650 vehicles per day (2023 count), of which roughly 30% are trucks.

How long is STC3854;BLK Brdg over Payette River?

The structure is 340 ft (103.6 m) long with a longest span of 55 ft (16.8 m) and a deck 29 ft wide.

Who owns STC3854;BLK Brdg over Payette River?

It is owned by the Other Local Agency.