US Bridges

Locust Grove Road over Mora Canal

Fair

Ada County, Idaho · 2.0 S. 2.3 E. Kuna · Structure no. 000000000025930

Built
1976
49 years old
Condition
Fair
inspected October 2023
Type
Tee Beam
Prestressed Concrete
Length
70 ft
3 main spans
Daily traffic
350
2023 count
Owner
County
County Highway Agency

About this bridge

Locust Grove Road over Mora Canal is a prestressed concrete tee beam carrying Locust Grove Road over Mora Canal in Ada 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 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 350 vehicles a day, roughly 10% of them trucks, projected to reach 525 by 2039. 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
CarriesLocust Grove Road
CrossesMora Canal
Location2.0 S. 2.3 E. Kuna
RouteCounty Highway 0
CountyAda County
StateIdaho
Coordinates43.46167, -116.37439
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
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 within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating52 US tons
Inventory rating31 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length70 ft (21.3 m)
Longest span23 ft (7 m)
Deck width32 ft (9.7 m)
Roadway width30 ft (9.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic350 (2023)
Projected traffic525 by 2039
Trucks10%
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 Locust Grove Road over Mora Canal built?

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

What condition is Locust Grove 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 Locust Grove Road over Mora Canal carry?

About 350 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is Locust Grove Road over Mora Canal?

The structure is 70 ft (21.3 m) long with a longest span of 23 ft (7 m) and a deck 32 ft wide.

Who owns Locust Grove Road over Mora Canal?

It is owned by the County Highway Agency.