US Bridges

Stc 6705; S 15th E over Sand Creek

Fair

Bonneville County, Idaho · 4.8 S. 1.9 E. Idaho Falls · Structure no. 000000000020795

Built
1952
73 years old, rebuilt 1970
Condition
Fair
inspected November 2024
Type
Frame
Concrete
Length
24 ft
1 main span
Daily traffic
1,900
2023 count
Owner
County
County Highway Agency

About this bridge

Stc 6705; S 15th E over Sand Creek is a concrete frame carrying Stc 6705; S 15th E over Sand Creek in Bonneville County, Idaho. It was built in 1952 and reconstructed in 1970, so it is 73 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 1,900 vehicles a day, roughly 10% of them trucks, projected to reach 2,850 by 2042. The structure is 24 ft (7.3 m) long and 36 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesStc 6705; S 15th E
CrossesSand Creek
Location4.8 S. 1.9 E. Idaho Falls
RouteCounty Highway 6705
StateIdaho
Coordinates43.42286, -112.00381
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
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 adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating38 US tons
Inventory rating23 US tons

Structure

Structure typeFrame
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 15
Structure length24 ft (7.3 m)
Longest span24 ft (7.3 m)
Deck width36 ft (11.1 m)
Roadway width31 ft (9.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,900 (2023)
Projected traffic2,850 by 2042
Trucks10%
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 Stc 6705; S 15th E over Sand Creek built?

It was built in 1952, making it 73 years old in 2025. It was reconstructed in 1970.

What condition is Stc 6705; S 15th E over Sand 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 November 2024.

How much traffic does Stc 6705; S 15th E over Sand Creek carry?

About 1,900 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is Stc 6705; S 15th E over Sand Creek?

The structure is 24 ft (7.3 m) long with a longest span of 24 ft (7.3 m) and a deck 36 ft wide.

Who owns Stc 6705; S 15th E over Sand Creek?

It is owned by the County Highway Agency.