US Bridges

Rainbow Road over I 86 Eb-Wb;rainbow RD Gs

Fair

Power County, Idaho · 10.6 E. American Falls · Structure no. 000000000023635

Built
1972
53 years old
Condition
Fair
inspected July 2022
Type
Box Beam or Girders - Single or Spread
Prestressed Concrete Continuous
Length
262 ft
2 main spans
Daily traffic
210
2023 count
Owner
State
State Highway Agency

About this bridge

Rainbow Road over I 86 Eb-Wb;rainbow RD Gs is a prestressed concrete continuous box beam or girders - single or spread carrying Rainbow Road over I 86 Eb-Wb;rainbow RD Gs in Power County, Idaho. It was built in 1972, so it is 53 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 210 vehicles a day, projected to reach 315 by 2042. The structure is 262 ft (79.9 m) long and 40 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesRainbow Road
CrossesI 86 Eb-Wb;rainbow RD Gs
Location10.6 E. American Falls
RouteCounty Highway 0
CountyPower County
StateIdaho
Coordinates42.87261, -112.69533
Functional classRural Minor Collector

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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Last inspectionJuly 2022
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating43 US tons
Inventory rating25 US tons

Structure

Structure typeBox Beam or Girders - Single or Spread
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length262 ft (79.9 m)
Longest span130 ft (39.6 m)
Deck width40 ft (12.1 m)
Roadway width37 ft (11.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic210 (2023)
Projected traffic315 by 2042
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed6.2 mi (10 km)
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 Rainbow Road over I 86 Eb-Wb;rainbow RD Gs built?

It was built in 1972, making it 53 years old in 2025.

What condition is Rainbow Road over I 86 Eb-Wb;rainbow RD Gs 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 July 2022.

How much traffic does Rainbow Road over I 86 Eb-Wb;rainbow RD Gs carry?

About 210 vehicles per day (2023 count).

How long is Rainbow Road over I 86 Eb-Wb;rainbow RD Gs?

The structure is 262 ft (79.9 m) long with a longest span of 130 ft (39.6 m) and a deck 40 ft wide.

Who owns Rainbow Road over I 86 Eb-Wb;rainbow RD Gs?

It is owned by the State Highway Agency.