US Bridges

Stc 3809;MIDDLE Fk over M.Fk.Boise R;sheep Creek

Fair

Elmore County, Idaho · 3.0 NE Twin Springs · Structure no. 000000000027895

Built
1965
60 years old
Condition
Fair
inspected September 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
195 ft
5 main spans
Daily traffic
30
2023 count
Owner
Local
Other Local Agency

About this bridge

Stc 3809;MIDDLE Fk over M.Fk.Boise R;sheep Creek is a steel continuous stringer/multi-beam or girder carrying Stc 3809;MIDDLE Fk over M.Fk.Boise R;sheep Creek in Elmore County, Idaho. It was built in 1965, so it is 60 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 30 vehicles a day, projected to reach 45 by 2042. The structure is 195 ft (59.4 m) long and 16 ft wide. If it were closed, the detour would be 37.9 mi (61 km).

Location

Open in Google Maps
CarriesStc 3809;MIDDLE Fk
CrossesM.Fk.Boise R;sheep Creek
Location3.0 NE Twin Springs
RouteFederal Lands Road 3809
CountyElmore County
StateIdaho
Coordinates43.69677, -115.65917
Functional classRural Major 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.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating43 US tons
Inventory rating26 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckWood or timber
Main spans5
Design loadHS 20
Structure length195 ft (59.4 m)
Longest span63 ft (19.2 m)
Deck width16 ft (4.8 m)
Roadway width15 ft (4.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic30 (2023)
Projected traffic45 by 2042
Trucks0%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed37.9 mi (61 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerOther Local Agency
Maintained byOther Local Agency
Historic statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$1.7 million (2019 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Stc 3809;MIDDLE Fk over M.Fk.Boise R;sheep Creek built?

It was built in 1965, making it 60 years old in 2025.

What condition is Stc 3809;MIDDLE Fk over M.Fk.Boise R;sheep Creek 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 2024.

How much traffic does Stc 3809;MIDDLE Fk over M.Fk.Boise R;sheep Creek carry?

About 30 vehicles per day (2023 count).

How long is Stc 3809;MIDDLE Fk over M.Fk.Boise R;sheep Creek?

The structure is 195 ft (59.4 m) long with a longest span of 63 ft (19.2 m) and a deck 16 ft wide.

Who owns Stc 3809;MIDDLE Fk over M.Fk.Boise R;sheep Creek?

It is owned by the Other Local Agency.