US Bridges

Stc 6851; S 1st E over Sand Creek

Fair

Bonneville County, Idaho · 2.5 N. Taylor · Structure no. 000000000021140

Built
1962
63 years old
Condition
Fair
inspected November 2024
Type
Tee Beam
Prestressed Concrete
Length
42 ft
1 main span
Daily traffic
1,300
2023 count
Owner
County
County Highway Agency

About this bridge

Stc 6851; S 1st E over Sand Creek is a prestressed concrete tee beam carrying Stc 6851; S 1st E over Sand Creek in Bonneville 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 1,300 vehicles a day, roughly 10% of them trucks, projected to reach 1,950 by 2042. The structure is 42 ft (12.8 m) long and 30 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesStc 6851; S 1st E
CrossesSand Creek
Location2.5 N. Taylor
RouteCounty Highway 6851
CountyBonneville County
StateIdaho
Coordinates43.41789, -112.03369
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
Deck8 Very GoodNo problems noted.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating38 US tons
Inventory rating23 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 15
Structure length42 ft (12.8 m)
Longest span40 ft (12.2 m)
Deck width30 ft (9.2 m)
Roadway width27 ft (8.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,300 (2023)
Projected traffic1,950 by 2042
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 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$665,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Stc 6851; S 1st E over Sand Creek built?

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

What condition is Stc 6851; S 1st 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 6851; S 1st E over Sand Creek carry?

About 1,300 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is Stc 6851; S 1st E over Sand Creek?

The structure is 42 ft (12.8 m) long with a longest span of 40 ft (12.2 m) and a deck 30 ft wide.

Who owns Stc 6851; S 1st E over Sand Creek?

It is owned by the County Highway Agency.