US Bridges

Stc 6725; N55th E over Sand Creek

Fair

Bonneville County, Idaho · 2.5 N. Iona · Structure no. 000000000020850

Built
1953
72 years old
Condition
Fair
inspected March 2023
Type
Stringer/Multi-beam or Girder
Concrete
Length
75 ft
3 main spans
Daily traffic
1,300
2023 count
Owner
County
County Highway Agency

About this bridge

Stc 6725; N55th E over Sand Creek is a concrete stringer/multi-beam or girder carrying Stc 6725; N55th E over Sand Creek in Bonneville County, Idaho. It was built in 1953, so it is 72 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 5 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 24% of them trucks, projected to reach 1,950 by 2042. The structure is 75 ft (22.9 m) long and 27 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesStc 6725; N55th E
CrossesSand Creek
Location2.5 N. Iona
RouteCounty Highway 6725
CountyBonneville County
StateIdaho
Coordinates43.56206, -111.92406
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating30 US tons
Inventory rating18 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialConcrete
DeckConcrete, cast-in-place
Main spans3
Design loadH 15
Structure length75 ft (22.9 m)
Longest span36 ft (11 m)
Deck width27 ft (8.1 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,300 (2023)
Projected traffic1,950 by 2042
Trucks24%
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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$850,000 (2019 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Stc 6725; N55th E over Sand Creek built?

It was built in 1953, making it 72 years old in 2025.

What condition is Stc 6725; N55th 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 March 2023.

How much traffic does Stc 6725; N55th E over Sand Creek carry?

About 1,300 vehicles per day (2023 count), of which roughly 24% are trucks.

How long is Stc 6725; N55th E over Sand Creek?

The structure is 75 ft (22.9 m) long with a longest span of 36 ft (11 m) and a deck 27 ft wide.

Who owns Stc 6725; N55th E over Sand Creek?

It is owned by the County Highway Agency.