US Bridges

Sma 7138;TOWER RD over Idaho Canal

FairPosted for load

Bonneville County, Idaho · 4.3 N. 0.4 E. Idaho Falls · Structure no. 000000000031100

Built
1959
66 years old
Condition
Fair
inspected November 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
71 ft
2 main spans
Daily traffic
800
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Sma 7138;TOWER RD over Idaho Canal is a prestressed concrete box beam or girders - multiple carrying Sma 7138;TOWER RD over Idaho Canal in Bonneville County, Idaho. It was built in 1959, so it is 66 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. Its operating status is: posted for load restriction.

It carries about 800 vehicles a day, roughly 14% of them trucks, projected to reach 1,200 by 2042. The structure is 71 ft (21.6 m) long and 26 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesSma 7138;TOWER RD
CrossesIdaho Canal
Location4.3 N. 0.4 E. Idaho Falls
RouteCity Street 7138
StateIdaho
Coordinates43.55344, -112.03092
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
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 inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourUnknown foundation; not evaluated for scour
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 adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating30 US tons
Inventory rating18 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans2
Design loadH 15
Structure length71 ft (21.6 m)
Longest span35 ft (10.7 m)
Deck width26 ft (8 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic800 (2023)
Projected traffic1,200 by 2042
Trucks14%
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

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$809,000 (2020 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Sma 7138;TOWER RD over Idaho Canal built?

It was built in 1959, making it 66 years old in 2025.

What condition is Sma 7138;TOWER RD 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 November 2024.

How much traffic does Sma 7138;TOWER RD over Idaho Canal carry?

About 800 vehicles per day (2023 count), of which roughly 14% are trucks.

How long is Sma 7138;TOWER RD over Idaho Canal?

The structure is 71 ft (21.6 m) long with a longest span of 35 ft (10.7 m) and a deck 26 ft wide.

Who owns Sma 7138;TOWER RD over Idaho Canal?

It is owned by the City or Municipal Highway Agency.