US Bridges

SMA9463;FIVE Mile over I 84;FIVE Mile RD Gs

Fair

Ada County, Idaho · 5.4 W. Boise · Structure no. 000000000026290

Built
1966
59 years old
Condition
Fair
inspected February 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
220 ft
4 main spans
Daily traffic
24,000
2023 count
Owner
State
State Highway Agency

About this bridge

SMA9463;FIVE Mile over I 84;FIVE Mile RD Gs is a prestressed concrete stringer/multi-beam or girder carrying SMA9463;FIVE Mile over I 84;FIVE Mile RD Gs in Ada County, Idaho. It was built in 1966, so it is 59 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 5 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 24,000 vehicles a day, roughly 2% of them trucks, projected to reach 36,000 by 2042. The structure is 220 ft (67.1 m) long and 33 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesSMA9463;FIVE Mile
CrossesI 84;FIVE Mile RD Gs
Location5.4 W. Boise
RouteCounty Highway 9463
CountyAda County
StateIdaho
Coordinates43.59704, -116.31405
Functional classUrban Minor Arterial

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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating79 US tons
Inventory rating46 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length220 ft (67.1 m)
Longest span73 ft (22.4 m)
Deck width33 ft (10 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic24,000 (2023)
Projected traffic36,000 by 2042
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed5 mi (8 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$1.8 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was SMA9463;FIVE Mile over I 84;FIVE Mile RD Gs built?

It was built in 1966, making it 59 years old in 2025.

What condition is SMA9463;FIVE Mile over I 84;FIVE Mile 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 February 2024.

How much traffic does SMA9463;FIVE Mile over I 84;FIVE Mile RD Gs carry?

About 24,000 vehicles per day (2023 count), of which roughly 2% are trucks.

How long is SMA9463;FIVE Mile over I 84;FIVE Mile RD Gs?

The structure is 220 ft (67.1 m) long with a longest span of 73 ft (22.4 m) and a deck 33 ft wide.

Who owns SMA9463;FIVE Mile over I 84;FIVE Mile RD Gs?

It is owned by the State Highway Agency.