US Bridges

STC3768;HUBBARD over Rawson Canal

Fair

Ada County, Idaho · 1.8 N. 4.1 E. Kuna · Structure no. 000000000026160

Built
1970
55 years old
Condition
Fair
inspected October 2023
Type
Tee Beam
Prestressed Concrete
Length
32 ft
1 main span
Daily traffic
1,200
2023 count
Owner
County
County Highway Agency

About this bridge

STC3768;HUBBARD over Rawson Canal is a prestressed concrete tee beam carrying STC3768;HUBBARD over Rawson Canal in Ada County, Idaho. It was built in 1970, so it is 55 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 1,200 vehicles a day, roughly 9% of them trucks, projected to reach 1,800 by 2042. The structure is 32 ft (9.8 m) long and 31 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesSTC3768;HUBBARD
CrossesRawson Canal
Location1.8 N. 4.1 E. Kuna
RouteCounty Highway 3768
CountyAda County
StateIdaho
Coordinates43.51731, -116.33836
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
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 adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating38 US tons
Inventory rating23 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length32 ft (9.8 m)
Longest span31 ft (9.4 m)
Deck width31 ft (9.5 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,200 (2023)
Projected traffic1,800 by 2042
Trucks9%
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$561,000 (2021 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was STC3768;HUBBARD over Rawson Canal built?

It was built in 1970, making it 55 years old in 2025.

What condition is STC3768;HUBBARD over Rawson 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 STC3768;HUBBARD over Rawson Canal carry?

About 1,200 vehicles per day (2023 count), of which roughly 9% are trucks.

How long is STC3768;HUBBARD over Rawson Canal?

The structure is 32 ft (9.8 m) long with a longest span of 31 ft (9.4 m) and a deck 31 ft wide.

Who owns STC3768;HUBBARD over Rawson Canal?

It is owned by the County Highway Agency.