US Bridges

SMA3343;COLUMBIA over Rawson Canal

Fair

Ada County, Idaho · 2.8 N 3.3 E Kuna · Structure no. 000000000026108

Built
1976
49 years old
Condition
Fair
inspected November 2024
Type
Frame
Concrete
Length
28 ft
1 main span
Daily traffic
3,400
2023 count
Owner
County
County Highway Agency

About this bridge

SMA3343;COLUMBIA over Rawson Canal is a concrete frame carrying SMA3343;COLUMBIA over Rawson 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 5 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 3,400 vehicles a day, roughly 5% of them trucks, projected to reach 5,100 by 2042. The structure is 28 ft (8.5 m) long and 109 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesSMA3343;COLUMBIA
CrossesRawson Canal
Location2.8 N 3.3 E Kuna
RouteCounty Highway 3343
CountyAda County
StateIdaho
Coordinates43.53191, -116.35377
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry9: Superior to present desirable criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating30 US tons
Inventory rating18 US tons

Structure

Structure typeFrame
MaterialConcrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length28 ft (8.5 m)
Longest span28 ft (8.5 m)
Deck width109 ft (33.2 m)
Roadway width48 ft (14.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,400 (2023)
Projected traffic5,100 by 2042
Trucks5%
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$534,000 (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SMA3343;COLUMBIA over Rawson Canal built?

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

What condition is SMA3343;COLUMBIA 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 November 2024.

How much traffic does SMA3343;COLUMBIA over Rawson Canal carry?

About 3,400 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is SMA3343;COLUMBIA over Rawson Canal?

The structure is 28 ft (8.5 m) long with a longest span of 28 ft (8.5 m) and a deck 109 ft wide.

Who owns SMA3343;COLUMBIA over Rawson Canal?

It is owned by the County Highway Agency.