US Bridges

Phillippi ST over Ridenbaugh Canal

Fair

Ada County, Idaho · In Boise · Structure no. 000000000025866

Built
1992
33 years old
Condition
Fair
inspected October 2022
Type
Frame
Concrete
Length
39 ft
1 main span
Daily traffic
1,700
2023 count
Owner
County
County Highway Agency

About this bridge

Phillippi ST over Ridenbaugh Canal is a concrete frame carrying Phillippi ST over Ridenbaugh Canal 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 1,700 vehicles a day, projected to reach 2,550 by 2042. The structure is 39 ft (11.9 m) long and 48 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesPhillippi ST
CrossesRidenbaugh Canal
LocationIn Boise
RouteCity Street 0
CountyAda County
StateIdaho
Coordinates43.60008, -116.24856
Functional classUrban Local

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.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionOctober 2022
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating110.1 US tons
Inventory rating59 US tons

Structure

Structure typeFrame
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 25 or greater
Structure length39 ft (11.9 m)
Longest span39 ft (11.9 m)
Deck width48 ft (14.5 m)
Roadway width35 ft (10.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,700 (2023)
Projected traffic2,550 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 Phillippi ST over Ridenbaugh Canal built?

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

What condition is Phillippi ST 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 2022.

How much traffic does Phillippi ST over Ridenbaugh Canal carry?

About 1,700 vehicles per day (2023 count).

How long is Phillippi ST over Ridenbaugh Canal?

The structure is 39 ft (11.9 m) long with a longest span of 39 ft (11.9 m) and a deck 48 ft wide.

Who owns Phillippi ST over Ridenbaugh Canal?

It is owned by the County Highway Agency.