US Bridges

E 81st N over Sand Creek

Good

Bonneville County, Idaho · 2.5 N. 1.0 E. Iona · Structure no. 000000000031296

Built
1991
34 years old
Condition
Good
inspected November 2024
Type
Tee Beam
Prestressed Concrete
Length
45 ft
1 main span
Daily traffic
230
2023 count
Owner
County
County Highway Agency

About this bridge

E 81st N over Sand Creek is a prestressed concrete tee beam carrying E 81st N over Sand Creek in Bonneville County, Idaho. It was built in 1991, so it is 34 years old, younger 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 230 vehicles a day, roughly 15% of them trucks, projected to reach 345 by 2042. The structure is 45 ft (13.7 m) long and 48 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesE 81st N
CrossesSand Creek
Location2.5 N. 1.0 E. Iona
RouteCounty Highway 0
StateIdaho
Coordinates43.569, -111.9045
Functional classRural Local

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 inspectionNovember 2024
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating80 US tons
Inventory rating42 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length45 ft (13.7 m)
Longest span43 ft (13.1 m)
Deck width48 ft (14.6 m)
Roadway width46 ft (14 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic230 (2023)
Projected traffic345 by 2042
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was E 81st N over Sand Creek built?

It was built in 1991, making it 34 years old in 2025.

What condition is E 81st N over Sand 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 November 2024.

How much traffic does E 81st N over Sand Creek carry?

About 230 vehicles per day (2023 count), of which roughly 15% are trucks.

How long is E 81st N over Sand Creek?

The structure is 45 ft (13.7 m) long with a longest span of 43 ft (13.1 m) and a deck 48 ft wide.

Who owns E 81st N over Sand Creek?

It is owned by the County Highway Agency.