US Bridges

SH 34 over Tincup Creek

Fair

Caribou County, Idaho · 17 E. Wayan · Structure no. 000000000014070

Built
1962
63 years old
Condition
Fair
inspected August 2023
Type
Slab
Concrete
Length
30 ft
1 main span
Daily traffic
770
2023 count
Owner
State
State Highway Agency

About this bridge

SH 34 over Tincup Creek is a concrete slab carrying SH 34 over Tincup Creek in Caribou County, Idaho. It was built in 1962, so it is 63 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 770 vehicles a day, roughly 26% of them trucks, projected to reach 1,155 by 2042. The structure is 30 ft (9.1 m) long and 29 ft wide. If it were closed, the detour would be 57.2 mi (92 km).

Location

Open in Google Maps
CarriesSH 34
CrossesTincup Creek
Location17 E. Wayan
RouteState Highway 34
CountyCaribou County
StateIdaho
Coordinates43.00294, -111.09856
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating42 US tons
Inventory rating25 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length30 ft (9.1 m)
Longest span30 ft (9.1 m)
Deck width29 ft (8.7 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic770 (2023)
Projected traffic1,155 by 2042
Trucks26%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed57.2 mi (92 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$420,000 (2023 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SH 34 over Tincup Creek built?

It was built in 1962, making it 63 years old in 2025.

What condition is SH 34 over Tincup 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 SH 34 over Tincup Creek carry?

About 770 vehicles per day (2023 count), of which roughly 26% are trucks.

How long is SH 34 over Tincup Creek?

The structure is 30 ft (9.1 m) long with a longest span of 30 ft (9.1 m) and a deck 29 ft wide.

Who owns SH 34 over Tincup Creek?

It is owned by the State Highway Agency.