US Bridges

Stc 3771;KING Road over Mora Canal

Fair

Ada County, Idaho · 1.2 S. 4.0 E. Kuna · Structure no. 000000000025785

Built
1978
47 years old
Condition
Fair
inspected October 2023
Type
Tee Beam
Prestressed Concrete
Length
94 ft
3 main spans
Daily traffic
610
2023 count
Owner
County
County Highway Agency

About this bridge

Stc 3771;KING Road over Mora Canal is a prestressed concrete tee beam carrying Stc 3771;KING Road over Mora Canal in Ada County, Idaho. It was built in 1978, so it is 47 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 610 vehicles a day, roughly 7% of them trucks, projected to reach 915 by 2042. The structure is 94 ft (28.7 m) long and 32 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesStc 3771;KING Road
CrossesMora Canal
Location1.2 S. 4.0 E. Kuna
RouteCounty Highway 3771
CountyAda County
StateIdaho
Coordinates43.47369, -116.34061
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 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 alignment7: Better than present minimum criteria
Operating rating42 US tons
Inventory rating25 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length94 ft (28.7 m)
Longest span31 ft (9.4 m)
Deck width32 ft (9.8 m)
Roadway width31 ft (9.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic610 (2023)
Projected traffic915 by 2042
Trucks7%
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 Stc 3771;KING Road over Mora Canal built?

It was built in 1978, making it 47 years old in 2025.

What condition is Stc 3771;KING Road over Mora 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 October 2023.

How much traffic does Stc 3771;KING Road over Mora Canal carry?

About 610 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is Stc 3771;KING Road over Mora Canal?

The structure is 94 ft (28.7 m) long with a longest span of 31 ft (9.4 m) and a deck 32 ft wide.

Who owns Stc 3771;KING Road over Mora Canal?

It is owned by the County Highway Agency.