US Bridges

Columbia Road over Mason Creek Feeder Canal

Fair

Ada County, Idaho · 2.8 N. 0.8 E. Kuna · Structure no. 000000000026110

Built
1989
36 years old
Condition
Fair
inspected March 2024
Type
Tee Beam
Wood or Timber
Length
49 ft
1 main span
Daily traffic
5,200
2023 count
Owner
County
County Highway Agency

About this bridge

Columbia Road over Mason Creek Feeder Canal is a wood or timber tee beam carrying Columbia Road over Mason Creek Feeder Canal in Ada County, Idaho. It was built in 1989, so it is 36 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 5,200 vehicles a day, projected to reach 7,800 by 2042. The structure is 49 ft (14.9 m) long and 36 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesColumbia Road
CrossesMason Creek Feeder Canal
Location2.8 N. 0.8 E. Kuna
RouteCounty Highway 0
CountyAda County
StateIdaho
Coordinates43.53203, -116.40333
Functional classUrban 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection9 ExcellentNo problems noted.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating51 US tons
Inventory rating37 US tons

Structure

Structure typeTee Beam
MaterialWood or Timber
DeckWood or timber
Main spans1
Design loadHS 20
Structure length49 ft (14.9 m)
Longest span46 ft (14 m)
Deck width36 ft (11.1 m)
Roadway width35 ft (10.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,200 (2023)
Projected traffic7,800 by 2042
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 Columbia Road over Mason Creek Feeder Canal built?

It was built in 1989, making it 36 years old in 2025.

What condition is Columbia Road over Mason Creek Feeder 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 March 2024.

How much traffic does Columbia Road over Mason Creek Feeder Canal carry?

About 5,200 vehicles per day (2023 count).

How long is Columbia Road over Mason Creek Feeder Canal?

The structure is 49 ft (14.9 m) long with a longest span of 46 ft (14 m) and a deck 36 ft wide.

Who owns Columbia Road over Mason Creek Feeder Canal?

It is owned by the County Highway Agency.