US Bridges

Riverton Rd; 300 S over Blackfoot River

Fair

Bingham County, Idaho · 2.5 S. 3.5 W. Blackfoot · Structure no. 000000000022555

Built
1974
51 years old
Condition
Fair
inspected November 2023
Type
Tee Beam
Prestressed Concrete
Length
58 ft
1 main span
Daily traffic
400
2023 count
Owner
County
County Highway Agency

About this bridge

Riverton Rd; 300 S over Blackfoot River is a prestressed concrete tee beam carrying Riverton Rd; 300 S over Blackfoot River in Bingham 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 400 vehicles a day, roughly 10% of them trucks, projected to reach 600 by 2039. The structure is 58 ft (17.7 m) long and 30 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesRiverton Rd; 300 S
CrossesBlackfoot River
Location2.5 S. 3.5 W. Blackfoot
RouteCounty Highway 0
CountyBingham County
StateIdaho
Coordinates43.15333, -112.41274
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum 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 loadH 20
Structure length58 ft (17.7 m)
Longest span56 ft (17.1 m)
Deck width30 ft (9.1 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic400 (2023)
Projected traffic600 by 2039
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 Riverton Rd; 300 S over Blackfoot River built?

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

What condition is Riverton Rd; 300 S over Blackfoot 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 November 2023.

How much traffic does Riverton Rd; 300 S over Blackfoot River carry?

About 400 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is Riverton Rd; 300 S over Blackfoot River?

The structure is 58 ft (17.7 m) long with a longest span of 56 ft (17.1 m) and a deck 30 ft wide.

Who owns Riverton Rd; 300 S over Blackfoot River?

It is owned by the County Highway Agency.