US Bridges

Stc 3805;SIMCO RD over I 84;BASELINE Simco Ic

Good

Elmore County, Idaho · 19.8 E. Boise;broadway · Structure no. 000000000019856

Built
2024
1 years old
Condition
Good
inspected October 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
224 ft
2 main spans
Daily traffic
850
2023 count
Owner
State
State Highway Agency

About this bridge

Stc 3805;SIMCO RD over I 84;BASELINE Simco Ic is a prestressed concrete stringer/multi-beam or girder carrying Stc 3805;SIMCO RD over I 84;BASELINE Simco Ic in Elmore County, Idaho. It was built in 2024, so it is 1 years old, younger than the Idaho average of 45.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 9 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 850 vehicles a day, roughly 9% of them trucks, projected to reach 1,275 by 2042. The structure is 224 ft (68.3 m) long and 42 ft wide. If it were closed, the detour would be 14.9 mi (24 km).

Location

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CarriesStc 3805;SIMCO RD
CrossesI 84;BASELINE Simco Ic
Location19.8 E. Boise;broadway
RouteCounty Highway 3805
CountyElmore County
StateIdaho
Coordinates43.34422, -115.95331
Functional classRural Major Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck9 ExcellentNo problems noted.
Superstructure9 ExcellentNo problems noted.
Substructure9 ExcellentNo problems noted.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation9: Superior to present desirable criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment9: Superior to present desirable criteria
Operating rating57.5 US tons
Inventory rating44 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans2
Design loadHL 93
Structure length224 ft (68.3 m)
Longest span110 ft (33.5 m)
Deck width42 ft (12.8 m)
Roadway width39 ft (11.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic850 (2023)
Projected traffic1,275 by 2042
Trucks9%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed14.9 mi (24 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 3805;SIMCO RD over I 84;BASELINE Simco Ic built?

It was built in 2024, making it 1 years old in 2025.

What condition is Stc 3805;SIMCO RD over I 84;BASELINE Simco Ic in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in October 2024.

How much traffic does Stc 3805;SIMCO RD over I 84;BASELINE Simco Ic carry?

About 850 vehicles per day (2023 count), of which roughly 9% are trucks.

How long is Stc 3805;SIMCO RD over I 84;BASELINE Simco Ic?

The structure is 224 ft (68.3 m) long with a longest span of 110 ft (33.5 m) and a deck 42 ft wide.

Who owns Stc 3805;SIMCO RD over I 84;BASELINE Simco Ic?

It is owned by the State Highway Agency.