US Bridges

Sma 7872; 8th ST over B-4 Canal

Fair

Minidoka County, Idaho · In RUPERT;8th Street · Structure no. 000000000025140

Built
1965
60 years old
Condition
Fair
inspected April 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
40 ft
2 main spans
Daily traffic
4,100
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Sma 7872; 8th ST over B-4 Canal is a steel continuous stringer/multi-beam or girder carrying Sma 7872; 8th ST over B-4 Canal in Minidoka County, Idaho. It was built in 1965, so it is 60 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 4,100 vehicles a day, roughly 6% of them trucks, projected to reach 6,150 by 2042. The structure is 40 ft (12.2 m) long and 28 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesSma 7872; 8th ST
CrossesB-4 Canal
LocationIn RUPERT;8th Street
RouteCity Street 7872
CountyMinidoka County
StateIdaho
Coordinates42.61964, -113.68278
Functional classUrban Minor Arterial

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 inspectionApril 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 geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating46 US tons
Inventory rating28 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckSteel plate
Main spans2
Design loadHS 20
Structure length40 ft (12.2 m)
Longest span19 ft (5.8 m)
Deck width28 ft (8.5 m)
Roadway width27 ft (8.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,100 (2023)
Projected traffic6,150 by 2042
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$840,000 (2018 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Sma 7872; 8th ST over B-4 Canal built?

It was built in 1965, making it 60 years old in 2025.

What condition is Sma 7872; 8th ST over B-4 Canal 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 April 2024.

How much traffic does Sma 7872; 8th ST over B-4 Canal carry?

About 4,100 vehicles per day (2023 count), of which roughly 6% are trucks.

How long is Sma 7872; 8th ST over B-4 Canal?

The structure is 40 ft (12.2 m) long with a longest span of 19 ft (5.8 m) and a deck 28 ft wide.

Who owns Sma 7872; 8th ST over B-4 Canal?

It is owned by the City or Municipal Highway Agency.