US Bridges

Sma 7403;FRANKLIN over Ridenbaugh Canal

Fair

Ada County, Idaho · 0.1 E. Liberty/Franklin · Structure no. 000000000021540

Built
1984
41 years old
Condition
Fair
inspected November 2024
Type
Tee Beam
Prestressed Concrete
Length
26 ft
1 main span
Daily traffic
12,000
2023 count
Owner
County
County Highway Agency

About this bridge

Sma 7403;FRANKLIN over Ridenbaugh Canal is a prestressed concrete tee beam carrying Sma 7403;FRANKLIN over Ridenbaugh Canal in Ada County, Idaho. It was built in 1984, so it is 41 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 12,000 vehicles a day, roughly 10% of them trucks, projected to reach 18,000 by 2042. The structure is 26 ft (7.9 m) long and 68 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesSma 7403;FRANKLIN
CrossesRidenbaugh Canal
Location0.1 E. Liberty/Franklin
RouteCity Street 7403
CountyAda County
StateIdaho
Coordinates43.60372, -116.26019
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating38 US tons
Inventory rating23 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length26 ft (7.9 m)
Longest span25 ft (7.6 m)
Deck width68 ft (20.6 m)
Roadway width48 ft (14.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic12,000 (2023)
Projected traffic18,000 by 2042
Trucks10%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$722,000 (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Sma 7403;FRANKLIN over Ridenbaugh Canal built?

It was built in 1984, making it 41 years old in 2025.

What condition is Sma 7403;FRANKLIN 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 November 2024.

How much traffic does Sma 7403;FRANKLIN over Ridenbaugh Canal carry?

About 12,000 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is Sma 7403;FRANKLIN over Ridenbaugh Canal?

The structure is 26 ft (7.9 m) long with a longest span of 25 ft (7.6 m) and a deck 68 ft wide.

Who owns Sma 7403;FRANKLIN over Ridenbaugh Canal?

It is owned by the County Highway Agency.