US Bridges

S. Knapp Ave over Ridenbaugh Canal

Good

Ada County, Idaho · 2.0 S. 2.4 E. Meridian · Structure no. 000000000026098

Built
2005
20 years old
Condition
Good
inspected March 2022
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
44 ft
1 main span
Daily traffic
2,000
2023 count
Owner
County
County Highway Agency

About this bridge

S. Knapp Ave over Ridenbaugh Canal is a prestressed concrete box beam or girders - multiple carrying S. Knapp Ave over Ridenbaugh Canal in Ada County, Idaho. It was built in 2005, so it is 20 years old, younger than the Idaho average of 45.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 2,000 vehicles a day, projected to reach 3,000 by 2042. The structure is 44 ft (13.4 m) long and 40 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesS. Knapp Ave
CrossesRidenbaugh Canal
Location2.0 S. 2.4 E. Meridian
RouteCity Street 0
CountyAda County
StateIdaho
Coordinates43.58262, -116.3445
Functional classUrban Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMarch 2022
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating89.9 US tons
Inventory rating45 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length44 ft (13.4 m)
Longest span41 ft (12.5 m)
Deck width40 ft (12.3 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,000 (2023)
Projected traffic3,000 by 2042
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.2 mi (2 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 S. Knapp Ave over Ridenbaugh Canal built?

It was built in 2005, making it 20 years old in 2025.

What condition is S. Knapp Ave over Ridenbaugh Canal in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in March 2022.

How much traffic does S. Knapp Ave over Ridenbaugh Canal carry?

About 2,000 vehicles per day (2023 count).

How long is S. Knapp Ave over Ridenbaugh Canal?

The structure is 44 ft (13.4 m) long with a longest span of 41 ft (12.5 m) and a deck 40 ft wide.

Who owns S. Knapp Ave over Ridenbaugh Canal?

It is owned by the County Highway Agency.