US Bridges

Stc 7117;9th ST over Idaho Canal

Fair

Bonneville County, Idaho · In Idaho FALLS;9th St. · Structure no. 000000000021465

Built
1951
74 years old, rebuilt 1989
Condition
Fair
inspected March 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
50 ft
2 main spans
Daily traffic
2,600
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Stc 7117;9th ST over Idaho Canal is a steel continuous stringer/multi-beam or girder carrying Stc 7117;9th ST over Idaho Canal in Bonneville County, Idaho. It was built in 1951 and reconstructed in 1989, so it is 74 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 2,600 vehicles a day, roughly 4% of them trucks, projected to reach 3,900 by 2042. The structure is 50 ft (15.2 m) long and 50 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesStc 7117;9th ST
CrossesIdaho Canal
LocationIn Idaho FALLS;9th St.
RouteCity Street 7117
CountyBonneville County
StateIdaho
Coordinates43.48969, -112.01011
Functional classUrban 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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
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 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 adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating44 US tons
Inventory rating26 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length50 ft (15.2 m)
Longest span25 ft (7.6 m)
Deck width50 ft (15.2 m)
Roadway width36 ft (11.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,600 (2023)
Projected traffic3,900 by 2042
Trucks4%
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$1.1 million (2017 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Stc 7117;9th ST over Idaho Canal built?

It was built in 1951, making it 74 years old in 2025. It was reconstructed in 1989.

What condition is Stc 7117;9th ST over Idaho 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 March 2023.

How much traffic does Stc 7117;9th ST over Idaho Canal carry?

About 2,600 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is Stc 7117;9th ST over Idaho Canal?

The structure is 50 ft (15.2 m) long with a longest span of 25 ft (7.6 m) and a deck 50 ft wide.

Who owns Stc 7117;9th ST over Idaho Canal?

It is owned by the City or Municipal Highway Agency.