US Bridges

SMA3909;KUNA Mora over Mora Canal

Fair

Ada County, Idaho · 2.2 S. 3.4 E. Kuna · Structure no. 000000000026255

Built
1973
52 years old
Condition
Fair
inspected October 2023
Type
Tee Beam
Prestressed Concrete
Length
70 ft
2 main spans
Daily traffic
1,500
2023 count
Owner
County
County Highway Agency

About this bridge

SMA3909;KUNA Mora over Mora Canal is a prestressed concrete tee beam carrying SMA3909;KUNA Mora over Mora Canal in Ada County, Idaho. It was built in 1973, so it is 52 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 1,500 vehicles a day, projected to reach 2,250 by 2042. The structure is 70 ft (21.3 m) long and 32 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesSMA3909;KUNA Mora
CrossesMora Canal
Location2.2 S. 3.4 E. Kuna
RouteCounty Highway 3909
CountyAda County
StateIdaho
Coordinates43.45942, -116.35386
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 evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating38 US tons
Inventory rating23 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length70 ft (21.3 m)
Longest span34 ft (10.4 m)
Deck width32 ft (9.8 m)
Roadway width30 ft (9.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,500 (2023)
Projected traffic2,250 by 2042
Trucks0%
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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$941,000 (2021 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SMA3909;KUNA Mora over Mora Canal built?

It was built in 1973, making it 52 years old in 2025.

What condition is SMA3909;KUNA Mora 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 SMA3909;KUNA Mora over Mora Canal carry?

About 1,500 vehicles per day (2023 count).

How long is SMA3909;KUNA Mora over Mora Canal?

The structure is 70 ft (21.3 m) long with a longest span of 34 ft (10.4 m) and a deck 32 ft wide.

Who owns SMA3909;KUNA Mora over Mora Canal?

It is owned by the County Highway Agency.