US Bridges

North 4850 East RD over Eagle Rock Canal

Fair

Jefferson County, Idaho · 0.2 N 2.0 E Ririe · Structure no. 000000000032285

Built
1974
51 years old
Condition
Fair
inspected March 2024
Type
Channel Beam
Prestressed Concrete
Length
36 ft
1 main span
Daily traffic
30
2023 count
Owner
County
County Highway Agency

About this bridge

North 4850 East RD over Eagle Rock Canal is a prestressed concrete channel beam carrying North 4850 East RD over Eagle Rock 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 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 30 vehicles a day, roughly 10% of them trucks, projected to reach 45 by 2039. The structure is 36 ft (11 m) long and 25 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesNorth 4850 East RD
CrossesEagle Rock Canal
Location0.2 N 2.0 E Ririe
RouteCounty Highway 0
CountyJefferson County
StateIdaho
Coordinates43.62978, -111.73578
Functional classRural 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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
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 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 rating38.7 US tons
Inventory rating28.8 US tons

Structure

Structure typeChannel Beam
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 15
Structure length36 ft (11 m)
Longest span35 ft (10.7 m)
Deck width25 ft (7.5 m)
Roadway width22 ft (6.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic30 (2023)
Projected traffic45 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 Eagle Rock Canal built?

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

What condition is North 4850 East RD over Eagle Rock 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 March 2024.

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

About 30 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is North 4850 East RD over Eagle Rock Canal?

The structure is 36 ft (11 m) long with a longest span of 35 ft (10.7 m) and a deck 25 ft wide.

Who owns North 4850 East RD over Eagle Rock Canal?

It is owned by the County Highway Agency.