US Bridges

Stc 3809;MIDDLE Fk over M.Fk.Boise River;loftus

FairPosted for load

Elmore County, Idaho · 6.2 S. 12.1 W.Dutch CR Rs · Structure no. 000000000027900

Built
1962
63 years old
Condition
Fair
inspected September 2024
Type
Truss - Thru
Steel
Length
181 ft
1 main span
Daily traffic
30
2023 count
Owner
Local
Other Local Agency

About this bridge

Stc 3809;MIDDLE Fk over M.Fk.Boise River;loftus is a steel truss - thru carrying Stc 3809;MIDDLE Fk over M.Fk.Boise River;loftus in Elmore County, Idaho. It was built in 1962, so it is 63 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. Its operating status is: posted for load restriction.

It carries about 30 vehicles a day, projected to reach 45 by 2042. The structure is 181 ft (55.2 m) long and 19 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 River;loftus
Location6.2 S. 12.1 W.Dutch CR Rs
RouteCounty Highway 3809
CountyElmore County
StateIdaho
Coordinates43.72222, -115.60664
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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating32 US tons
Inventory rating19 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckWood or timber
Main spans1 (+2 approach)
Design loadHS 20
Structure length181 ft (55.2 m)
Longest span75 ft (22.9 m)
Deck width19 ft (5.9 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$1.6 million (2019 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Stc 3809;MIDDLE Fk over M.Fk.Boise River;loftus built?

It was built in 1962, making it 63 years old in 2025.

What condition is Stc 3809;MIDDLE Fk over M.Fk.Boise River;loftus 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 River;loftus carry?

About 30 vehicles per day (2023 count).

How long is Stc 3809;MIDDLE Fk over M.Fk.Boise River;loftus?

The structure is 181 ft (55.2 m) long with a longest span of 75 ft (22.9 m) and a deck 19 ft wide.

Who owns Stc 3809;MIDDLE Fk over M.Fk.Boise River;loftus?

It is owned by the Other Local Agency.