US Bridges

Stc 7859;ROBINSON over I 84; Robinson RD Gs

Fair

Canyon County, Idaho · 1.5 E. Nampa Ecl · Structure no. 000000000027646

Built
2009
16 years old
Condition
Fair
inspected June 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
196 ft
2 main spans
Daily traffic
8,600
2023 count
Owner
State
State Highway Agency

About this bridge

Stc 7859;ROBINSON over I 84; Robinson RD Gs is a prestressed concrete stringer/multi-beam or girder carrying Stc 7859;ROBINSON over I 84; Robinson RD Gs in Canyon County, Idaho. It was built in 2009, so it is 16 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 8,600 vehicles a day, roughly 2% of them trucks, projected to reach 12,900 by 2042. The structure is 196 ft (59.7 m) long and 46 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

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CarriesStc 7859;ROBINSON
CrossesI 84; Robinson RD Gs
Location1.5 E. Nampa Ecl
RouteCounty Highway 7859
CountyCanyon County
StateIdaho
Coordinates43.59892, -116.49356
Functional classUrban 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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Last inspectionJune 2023
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating81 US tons
Inventory rating42 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans2
Design loadHL 93
Structure length196 ft (59.7 m)
Longest span97 ft (29.6 m)
Deck width46 ft (14 m)
Roadway width43 ft (13.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,600 (2023)
Projected traffic12,900 by 2042
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
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 Stc 7859;ROBINSON over I 84; Robinson RD Gs built?

It was built in 2009, making it 16 years old in 2025.

What condition is Stc 7859;ROBINSON over I 84; Robinson 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 June 2023.

How much traffic does Stc 7859;ROBINSON over I 84; Robinson RD Gs carry?

About 8,600 vehicles per day (2023 count), of which roughly 2% are trucks.

How long is Stc 7859;ROBINSON over I 84; Robinson RD Gs?

The structure is 196 ft (59.7 m) long with a longest span of 97 ft (29.6 m) and a deck 46 ft wide.

Who owns Stc 7859;ROBINSON over I 84; Robinson RD Gs?

It is owned by the State Highway Agency.