US Bridges

SH 34 over Tincup Creek

Good

Caribou County, Idaho · 12 E. Wayan · Structure no. 000000000014050

Built
1969
56 years old
Condition
Good
inspected August 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
82 ft
1 main span
Daily traffic
770
2023 count
Owner
State
State Highway Agency

About this bridge

SH 34 over Tincup Creek is a prestressed concrete stringer/multi-beam or girder carrying SH 34 over Tincup Creek in Caribou County, Idaho. It was built in 1969, so it is 56 years old, older than the Idaho average of 45.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 770 vehicles a day, roughly 26% of them trucks, projected to reach 1,155 by 2042. The structure is 82 ft (25 m) long and 31 ft wide. If it were closed, the detour would be 57.2 mi (92 km).

CarriesSH 34
CrossesTincup Creek
Location12 E. Wayan
RouteState Highway 34
StateIdaho
Coordinates42.97647, -111.17497
Functional classRural Major Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2023
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than 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 rating78 US tons
Inventory rating46 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length82 ft (25 m)
Longest span80 ft (24.4 m)
Deck width31 ft (9.4 m)
Roadway width28 ft (8.5 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was SH 34 over Tincup Creek built?

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

What condition is SH 34 over Tincup Creek in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. 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 82 ft (25 m) long with a longest span of 80 ft (24.4 m) and a deck 31 ft wide.

Who owns SH 34 over Tincup Creek?

It is owned by the State Highway Agency.