US Bridges

I 86 Ebl over Rock Cr;massacre Rock Br

Fair

Power County, Idaho · 12.1 W. American Falls · Structure no. 000000000010705

Built
1980
45 years old
Condition
Fair
inspected September 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
178 ft
3 main spans
Daily traffic
4,150
2023 count
Owner
State
State Highway Agency

About this bridge

I 86 Ebl over Rock Cr;massacre Rock Br is a prestressed concrete continuous stringer/multi-beam or girder carrying I 86 Ebl over Rock Cr;massacre Rock Br in Power County, Idaho. It was built in 1980, so it is 45 years old, younger 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 4,150 vehicles a day, roughly 26% of them trucks, projected to reach 6,225 by 2042. The structure is 178 ft (54.3 m) long and 45 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesI 86 Ebl
CrossesRock Cr;massacre Rock Br
Location12.1 W. American Falls
RouteInterstate 86
CountyPower County
StateIdaho
Coordinates42.65203, -113.01436
Functional classRural Principal Arterial - Interstate

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionSeptember 2024
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry8: Equal to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating79 US tons
Inventory rating33 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length178 ft (54.3 m)
Longest span58 ft (17.7 m)
Deck width45 ft (13.6 m)
Roadway width42 ft (12.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,150 (2023)
Projected traffic6,225 by 2042
Trucks26%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 I 86 Ebl over Rock Cr;massacre Rock Br built?

It was built in 1980, making it 45 years old in 2025.

What condition is I 86 Ebl over Rock Cr;massacre Rock Br 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 September 2024.

How much traffic does I 86 Ebl over Rock Cr;massacre Rock Br carry?

About 4,150 vehicles per day (2023 count), of which roughly 26% are trucks.

How long is I 86 Ebl over Rock Cr;massacre Rock Br?

The structure is 178 ft (54.3 m) long with a longest span of 58 ft (17.7 m) and a deck 45 ft wide.

Who owns I 86 Ebl over Rock Cr;massacre Rock Br?

It is owned by the State Highway Agency.