US Bridges

Massacre Rocks RD over I 86;MASSACRE Rocks Ic

Fair

Power County, Idaho · 10.9 W. American Falls · Structure no. 000000000023585

Built
1985
40 years old
Condition
Fair
inspected September 2022
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
261 ft
2 main spans
Daily traffic
110
2023 count
Owner
State
State Highway Agency

About this bridge

Massacre Rocks RD over I 86;MASSACRE Rocks Ic is a steel continuous stringer/multi-beam or girder carrying Massacre Rocks RD over I 86;MASSACRE Rocks Ic in Power County, Idaho. It was built in 1985, so it is 40 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 110 vehicles a day, projected to reach 165 by 2042. The structure is 261 ft (79.6 m) long and 40 ft wide.

Location

Open in Google Maps
CarriesMassacre Rocks RD
CrossesI 86;MASSACRE Rocks Ic
Location10.9 W. American Falls
RouteCounty Highway 0
CountyPower County
StateIdaho
Coordinates42.66889, -112.99272
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionSeptember 2022
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating84 US tons
Inventory rating50 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length261 ft (79.6 m)
Longest span129 ft (39.3 m)
Deck width40 ft (12.1 m)
Roadway width37 ft (11.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic110 (2023)
Projected traffic165 by 2042
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed—
TollOn a free road
National Highway SystemNo

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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Massacre Rocks RD over I 86;MASSACRE Rocks Ic built?

It was built in 1985, making it 40 years old in 2025.

What condition is Massacre Rocks RD over I 86;MASSACRE Rocks Ic 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 2022.

How much traffic does Massacre Rocks RD over I 86;MASSACRE Rocks Ic carry?

About 110 vehicles per day (2023 count).

How long is Massacre Rocks RD over I 86;MASSACRE Rocks Ic?

The structure is 261 ft (79.6 m) long with a longest span of 129 ft (39.3 m) and a deck 40 ft wide.

Who owns Massacre Rocks RD over I 86;MASSACRE Rocks Ic?

It is owned by the State Highway Agency.