US Bridges

STC3768;HUBBARD over Mason Creek

Fair

Ada County, Idaho · 1.8 N. 1.9 E. Kuna · Structure no. 000000000026066

Built
1992
33 years old
Condition
Fair
inspected November 2024
Type
Frame
Concrete
Length
31 ft
1 main span
Daily traffic
390
2023 count
Owner
County
County Highway Agency

About this bridge

STC3768;HUBBARD over Mason Creek is a concrete frame carrying STC3768;HUBBARD over Mason Creek in Ada County, Idaho. It was built in 1992, so it is 33 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 390 vehicles a day, roughly 8% of them trucks, projected to reach 585 by 2042. The structure is 31 ft (9.4 m) long and 33 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesSTC3768;HUBBARD
CrossesMason Creek
Location1.8 N. 1.9 E. Kuna
RouteCounty Highway 3768
CountyAda County
StateIdaho
Coordinates43.5173, -116.38118
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionNovember 2024
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating109 US tons
Inventory rating65 US tons

Structure

Structure typeFrame
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 25 or greater
Structure length31 ft (9.4 m)
Longest span31 ft (9.4 m)
Deck width33 ft (10.2 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic390 (2023)
Projected traffic585 by 2042
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 STC3768;HUBBARD over Mason Creek built?

It was built in 1992, making it 33 years old in 2025.

What condition is STC3768;HUBBARD over Mason Creek 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 November 2024.

How much traffic does STC3768;HUBBARD over Mason Creek carry?

About 390 vehicles per day (2023 count), of which roughly 8% are trucks.

How long is STC3768;HUBBARD over Mason Creek?

The structure is 31 ft (9.4 m) long with a longest span of 31 ft (9.4 m) and a deck 33 ft wide.

Who owns STC3768;HUBBARD over Mason Creek?

It is owned by the County Highway Agency.