US Bridges

SH 33 over Siddoway Canal

Fair

Fremont County, Idaho · In Teton · Structure no. 000000000013930

Built
1984
41 years old
Condition
Fair
inspected March 2024
Type
Frame
Concrete
Length
21 ft
1 main span
Daily traffic
4,600
2023 count
Owner
State
State Highway Agency

About this bridge

SH 33 over Siddoway Canal is a concrete frame carrying SH 33 over Siddoway Canal in Fremont County, Idaho. It was built in 1984, so it is 41 years old, younger 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 4,600 vehicles a day, roughly 9% of them trucks, projected to reach 6,900 by 2042. The structure is 21 ft (6.4 m) long and 56 ft wide.

Location

Open in Google Maps
CarriesSH 33
CrossesSiddoway Canal
LocationIn Teton
RouteState Highway 33
CountyFremont County
StateIdaho
Coordinates43.88653, -111.66508
Functional classRural 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.
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 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating67 US tons
Inventory rating40 US tons

Structure

Structure typeFrame
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length21 ft (6.4 m)
Longest span21 ft (6.4 m)
Deck width56 ft (17.1 m)
Roadway width54 ft (16.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,600 (2023)
Projected traffic6,900 by 2042
Trucks9%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was SH 33 over Siddoway Canal built?

It was built in 1984, making it 41 years old in 2025.

What condition is SH 33 over Siddoway 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 SH 33 over Siddoway Canal carry?

About 4,600 vehicles per day (2023 count), of which roughly 9% are trucks.

How long is SH 33 over Siddoway Canal?

The structure is 21 ft (6.4 m) long with a longest span of 21 ft (6.4 m) and a deck 56 ft wide.

Who owns SH 33 over Siddoway Canal?

It is owned by the State Highway Agency.