US Bridges

North 4850 East RD over Anderson Canal

Good

Jefferson County, Idaho · 0.1 N. 2.0 E. Ririe · Structure no. 000000000032265

Built
1974
51 years old
Condition
Good
inspected March 2024
Type
Tee Beam
Prestressed Concrete
Length
24 ft
1 main span
Daily traffic
20
2023 count
Owner
County
County Highway Agency

About this bridge

North 4850 East RD over Anderson Canal is a prestressed concrete tee beam carrying North 4850 East RD over Anderson Canal in Jefferson County, Idaho. It was built in 1974, so it is 51 years old, older 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 20 vehicles a day, roughly 10% of them trucks, projected to reach 30 by 2039. The structure is 24 ft (7.3 m) long and 28 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

CarriesNorth 4850 East RD
CrossesAnderson Canal
Location0.1 N. 2.0 E. Ririe
RouteCounty Highway 0
StateIdaho
Coordinates43.62828, -111.73569
Functional classRural 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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMarch 2024
Inspection intervalevery 24 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 adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating38.7 US tons
Inventory rating27.8 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 15
Structure length24 ft (7.3 m)
Longest span23 ft (7 m)
Deck width28 ft (8.5 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic20 (2023)
Projected traffic30 by 2039
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 North 4850 East RD over Anderson Canal built?

It was built in 1974, making it 51 years old in 2025.

What condition is North 4850 East RD over Anderson 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 2024.

How much traffic does North 4850 East RD over Anderson Canal carry?

About 20 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is North 4850 East RD over Anderson Canal?

The structure is 24 ft (7.3 m) long with a longest span of 23 ft (7 m) and a deck 28 ft wide.

Who owns North 4850 East RD over Anderson Canal?

It is owned by the County Highway Agency.