US Bridges

SMA6734;S 35th W over Sidehill Canal

Fair

Bonneville County, Idaho · 1.9 S. 3.2 W. Idaho Falls · Structure no. 000000000031245

Built
1952
73 years old
Condition
Fair
inspected March 2024
Type
Frame
Concrete
Length
27 ft
1 main span
Daily traffic
1,100
2023 count
Owner
County
County Highway Agency

About this bridge

SMA6734;S 35th W over Sidehill Canal is a concrete frame carrying SMA6734;S 35th W over Sidehill Canal in Bonneville County, Idaho. It was built in 1952, so it is 73 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 1,100 vehicles a day, roughly 11% of them trucks, projected to reach 1,650 by 2042. The structure is 27 ft (8.2 m) long and 26 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesSMA6734;S 35th W
CrossesSidehill Canal
Location1.9 S. 3.2 W. Idaho Falls
RouteCounty Highway 6734
CountyBonneville County
StateIdaho
Coordinates43.46222, -112.10294
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMarch 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 adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating38 US tons
Inventory rating23 US tons

Structure

Structure typeFrame
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length27 ft (8.2 m)
Longest span27 ft (8.2 m)
Deck width26 ft (7.9 m)
Roadway width22 ft (6.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,100 (2023)
Projected traffic1,650 by 2042
Trucks11%
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$465,000 (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SMA6734;S 35th W over Sidehill Canal built?

It was built in 1952, making it 73 years old in 2025.

What condition is SMA6734;S 35th W over Sidehill 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 2024.

How much traffic does SMA6734;S 35th W over Sidehill Canal carry?

About 1,100 vehicles per day (2023 count), of which roughly 11% are trucks.

How long is SMA6734;S 35th W over Sidehill Canal?

The structure is 27 ft (8.2 m) long with a longest span of 27 ft (8.2 m) and a deck 26 ft wide.

Who owns SMA6734;S 35th W over Sidehill Canal?

It is owned by the County Highway Agency.