US Bridges

Stc 5756;BIG CR RD over Big Creek;sunshine Mine

Fair

Shoshone County, Idaho · 6.1 E. Kellogg · Structure no. 000000000020555

Built
1974
51 years old
Condition
Fair
inspected October 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
82 ft
1 main span
Daily traffic
60
2023 count
Owner
County
County Highway Agency

About this bridge

Stc 5756;BIG CR RD over Big Creek;sunshine Mine is a prestressed concrete box beam or girders - multiple carrying Stc 5756;BIG CR RD over Big Creek;sunshine Mine in Shoshone County, Idaho. It was built in 1974, so it is 51 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 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 60 vehicles a day, roughly 99% of them trucks, projected to reach 90 by 2042. The structure is 82 ft (25 m) long and 32 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

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CarriesStc 5756;BIG CR RD
CrossesBig Creek;sunshine Mine
Location6.1 E. Kellogg
RouteCounty Highway 5756
CountyShoshone County
StateIdaho
Coordinates47.50359, -116.07184
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.
Substructure9 ExcellentNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry7: Better than present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating60 US tons
Inventory rating16 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length82 ft (25 m)
Longest span80 ft (24.4 m)
Deck width32 ft (9.7 m)
Roadway width29 ft (8.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic60 (2023)
Projected traffic90 by 2042
Trucks99%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$795,000 (2020 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Stc 5756;BIG CR RD over Big Creek;sunshine Mine built?

It was built in 1974, making it 51 years old in 2025.

What condition is Stc 5756;BIG CR RD over Big Creek;sunshine Mine 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 October 2024.

How much traffic does Stc 5756;BIG CR RD over Big Creek;sunshine Mine carry?

About 60 vehicles per day (2023 count), of which roughly 99% are trucks.

How long is Stc 5756;BIG CR RD over Big Creek;sunshine Mine?

The structure is 82 ft (25 m) long with a longest span of 80 ft (24.4 m) and a deck 32 ft wide.

Who owns Stc 5756;BIG CR RD over Big Creek;sunshine Mine?

It is owned by the County Highway Agency.