US Bridges

N 160 E; N 4950 E over Anderson Canal

Fair

Bonneville County, Idaho · 0.1 S. 3.0 E. Ririe · Structure no. 000000000031140

Built
1964
61 years old
Condition
Fair
inspected November 2023
Type
Tee Beam
Prestressed Concrete
Length
34 ft
1 main span
Daily traffic
560
2023 count
Owner
County
County Highway Agency

About this bridge

N 160 E; N 4950 E over Anderson Canal is a prestressed concrete tee beam carrying N 160 E; N 4950 E over Anderson Canal in Bonneville County, Idaho. It was built in 1964, so it is 61 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 560 vehicles a day, roughly 12% of them trucks, projected to reach 840 by 2042. The structure is 34 ft (10.4 m) long and 33 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesN 160 E; N 4950 E
CrossesAnderson Canal
Location0.1 S. 3.0 E. Ririe
RouteCounty Highway 0
CountyBonneville County
StateIdaho
Coordinates43.62519, -111.71564
Functional classRural Minor Collector

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 protection7 GoodSome minor problems.
Last inspectionNovember 2023
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 geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating38 US tons
Inventory rating23 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadH 20
Structure length34 ft (10.4 m)
Longest span33 ft (10.1 m)
Deck width33 ft (10 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic560 (2023)
Projected traffic840 by 2042
Trucks12%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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$471,000 (2023 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was N 160 E; N 4950 E over Anderson Canal built?

It was built in 1964, making it 61 years old in 2025.

What condition is N 160 E; N 4950 E over Anderson 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 2023.

How much traffic does N 160 E; N 4950 E over Anderson Canal carry?

About 560 vehicles per day (2023 count), of which roughly 12% are trucks.

How long is N 160 E; N 4950 E over Anderson Canal?

The structure is 34 ft (10.4 m) long with a longest span of 33 ft (10.1 m) and a deck 33 ft wide.

Who owns N 160 E; N 4950 E over Anderson Canal?

It is owned by the County Highway Agency.