US Bridges

Sma 7603;BOISE Ave over Ridenbaugh Canal

Fair

Ada County, Idaho · In Boise on Boise Avenue · Structure no. 000000000021680

Built
1988
37 years old
Condition
Fair
inspected October 2024
Type
Culvert
Concrete Continuous
Length
54 ft
2 main spans
Daily traffic
6,100
2023 count
Owner
County
County Highway Agency

About this bridge

Sma 7603;BOISE Ave over Ridenbaugh Canal is a concrete continuous culvert carrying Sma 7603;BOISE Ave over Ridenbaugh Canal in Ada County, Idaho. It was built in 1988, so it is 37 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 6,100 vehicles a day, roughly 2% of them trucks, projected to reach 9,150 by 2042. The structure is 54 ft (16.5 m) long and 54 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

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CarriesSma 7603;BOISE Ave
CrossesRidenbaugh Canal
LocationIn Boise on Boise Avenue
RouteCounty Highway 7603
CountyAda County
StateIdaho
Coordinates43.57442, -116.16466
Functional classUrban 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
Channel and channel protection9 ExcellentNo problems noted.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2024
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to 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 rating97 US tons
Inventory rating60 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadH 20
Structure length54 ft (16.5 m)
Longest span26 ft (7.9 m)
Deck width54 ft (16.5 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,100 (2023)
Projected traffic9,150 by 2042
Trucks2%
Lanes on structure3
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed0.6 mi (1 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$1.2 million (2020 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Sma 7603;BOISE Ave over Ridenbaugh Canal built?

It was built in 1988, making it 37 years old in 2025.

What condition is Sma 7603;BOISE Ave over Ridenbaugh 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 2024.

How much traffic does Sma 7603;BOISE Ave over Ridenbaugh Canal carry?

About 6,100 vehicles per day (2023 count), of which roughly 2% are trucks.

How long is Sma 7603;BOISE Ave over Ridenbaugh Canal?

The structure is 54 ft (16.5 m) long with a longest span of 26 ft (7.9 m) and a deck 54 ft wide.

Who owns Sma 7603;BOISE Ave over Ridenbaugh Canal?

It is owned by the County Highway Agency.