US Bridges

Kings Rd; N 500 E over Great Western Canal

Fair

Bingham County, Idaho · 2.5 N. 0.7 W. Firth · Structure no. 000000000022935

Built
1976
49 years old
Condition
Fair
inspected April 2024
Type
Frame
Concrete
Length
22 ft
1 main span
Daily traffic
90
2023 count
Owner
County
County Highway Agency

About this bridge

Kings Rd; N 500 E over Great Western Canal is a concrete frame carrying Kings Rd; N 500 E over Great Western Canal in Bingham County, Idaho. It was built in 1976, so it is 49 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 90 vehicles a day, roughly 10% of them trucks, projected to reach 135 by 2039. The structure is 22 ft (6.7 m) long and 30 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

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CarriesKings Rd; N 500 E
CrossesGreat Western Canal
Location2.5 N. 0.7 W. Firth
RouteCounty Highway 0
CountyBingham County
StateIdaho
Coordinates43.33778, -112.19769
Functional classRural Local

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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry7: Better than present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating30 US tons
Inventory rating18 US tons

Structure

Structure typeFrame
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length22 ft (6.7 m)
Longest span20 ft (6.1 m)
Deck width30 ft (9.1 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic90 (2023)
Projected traffic135 by 2039
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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$277,000 (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Kings Rd; N 500 E over Great Western Canal built?

It was built in 1976, making it 49 years old in 2025.

What condition is Kings Rd; N 500 E over Great Western 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 April 2024.

How much traffic does Kings Rd; N 500 E over Great Western Canal carry?

About 90 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is Kings Rd; N 500 E over Great Western Canal?

The structure is 22 ft (6.7 m) long with a longest span of 20 ft (6.1 m) and a deck 30 ft wide.

Who owns Kings Rd; N 500 E over Great Western Canal?

It is owned by the County Highway Agency.