US Bridges

STC3928;S Eagle RD over Kuna Canal

Fair

Ada County, Idaho · 0.1 S. 3.3 E. Kuna · Structure no. 000000000026265

Built
1988
37 years old
Condition
Fair
inspected February 2023
Type
Slab
Concrete Continuous
Length
41 ft
2 main spans
Daily traffic
570
2023 count
Owner
County
County Highway Agency

About this bridge

STC3928;S Eagle RD over Kuna Canal is a concrete continuous slab carrying STC3928;S Eagle RD over Kuna Canal in Ada County, Idaho. It was built in 1988, so it is 37 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 570 vehicles a day, roughly 6% of them trucks, projected to reach 855 by 2042. The structure is 41 ft (12.5 m) long and 34 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesSTC3928;S Eagle RD
CrossesKuna Canal
Location0.1 S. 3.3 E. Kuna
RouteCounty Highway 3928
CountyAda County
StateIdaho
Coordinates43.48858, -116.35439
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 protection9 ExcellentNo problems noted.
Last inspectionFebruary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating52 US tons
Inventory rating31 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length41 ft (12.5 m)
Longest span18 ft (5.5 m)
Deck width34 ft (10.3 m)
Roadway width31 ft (9.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic570 (2023)
Projected traffic855 by 2042
Trucks6%
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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was STC3928;S Eagle RD over Kuna Canal built?

It was built in 1988, making it 37 years old in 2025.

What condition is STC3928;S Eagle RD over Kuna 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 February 2023.

How much traffic does STC3928;S Eagle RD over Kuna Canal carry?

About 570 vehicles per day (2023 count), of which roughly 6% are trucks.

How long is STC3928;S Eagle RD over Kuna Canal?

The structure is 41 ft (12.5 m) long with a longest span of 18 ft (5.5 m) and a deck 34 ft wide.

Who owns STC3928;S Eagle RD over Kuna Canal?

It is owned by the County Highway Agency.