US Bridges

STC4693;S 550 E over H Canal

Fair

Cassia County, Idaho · 3.8 S. 3.0 W. Declo · Structure no. 000000000024116

Built
2004
21 years old
Condition
Fair
inspected March 2024
Type
Frame
Concrete
Length
25 ft
1 main span
Daily traffic
210
2023 count
Owner
Local
Other Local Agency

About this bridge

STC4693;S 550 E over H Canal is a concrete frame carrying STC4693;S 550 E over H Canal in Cassia County, Idaho. It was built in 2004, so it is 21 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 210 vehicles a day, roughly 40% of them trucks, projected to reach 315 by 2042. The structure is 25 ft (7.6 m) long and 50 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesSTC4693;S 550 E
CrossesH Canal
Location3.8 S. 3.0 W. Declo
RouteCounty Highway 4693
CountyCassia County
StateIdaho
Coordinates42.46522, -113.68628
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.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
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 adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating99.9 US tons
Inventory rating79 US tons

Structure

Structure typeFrame
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length25 ft (7.6 m)
Longest span25 ft (7.6 m)
Deck width50 ft (15.2 m)
Roadway width48 ft (14.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic210 (2023)
Projected traffic315 by 2042
Trucks40%
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

OwnerOther Local Agency
Maintained byOther Local 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 STC4693;S 550 E over H Canal built?

It was built in 2004, making it 21 years old in 2025.

What condition is STC4693;S 550 E over H 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 STC4693;S 550 E over H Canal carry?

About 210 vehicles per day (2023 count), of which roughly 40% are trucks.

How long is STC4693;S 550 E over H Canal?

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

Who owns STC4693;S 550 E over H Canal?

It is owned by the Other Local Agency.