US Bridges

E. Riverdale RD over Bear River

FairPosted for load

Franklin County, Idaho · 4.8 N. 2.3 E. Preston · Structure no. 000000000023350

Built
1931
94 years old
Condition
Fair
inspected October 2024
Type
Truss - Thru
Steel
Length
104 ft
1 main span
Daily traffic
70
2023 count
Owner
County
County Highway Agency

About this bridge

E. Riverdale RD over Bear River is a steel truss - thru carrying E. Riverdale RD over Bear River in Franklin County, Idaho. It was built in 1931, so it is 94 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. Its operating status is: posted for load restriction.

It carries about 70 vehicles a day, roughly 10% of them trucks, projected to reach 105 by 2039. The structure is 104 ft (31.7 m) long and 21 ft wide.

CarriesE. Riverdale RD
CrossesBear River
Location4.8 N. 2.3 E. Preston
RouteCounty Highway 0
StateIdaho
Coordinates42.16619, -111.83133
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
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 inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating39 US tons
Inventory rating23 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadH 15
Structure length104 ft (31.7 m)
Longest span100 ft (30.5 m)
Deck width21 ft (6.5 m)
Roadway width20 ft (6.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic70 (2023)
Projected traffic105 by 2039
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
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$950,000 (2020 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was E. Riverdale RD over Bear River built?

It was built in 1931, making it 94 years old in 2025.

What condition is E. Riverdale RD over Bear River 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 2024.

How much traffic does E. Riverdale RD over Bear River carry?

About 70 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is E. Riverdale RD over Bear River?

The structure is 104 ft (31.7 m) long with a longest span of 100 ft (30.5 m) and a deck 21 ft wide.

Who owns E. Riverdale RD over Bear River?

It is owned by the County Highway Agency.