US Bridges

Stc 3811;FH 61 Rd. over S.Fk.Boise River

Fair

Elmore County, Idaho · 0.5S 0.4W Featherville · Structure no. 000000000027875

Built
1968
57 years old
Condition
Fair
inspected November 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
171 ft
3 main spans
Daily traffic
620
2023 count
Owner
Local
Other Local Agency

About this bridge

Stc 3811;FH 61 Rd. over S.Fk.Boise River is a prestressed concrete stringer/multi-beam or girder carrying Stc 3811;FH 61 Rd. over S.Fk.Boise River in Elmore County, Idaho. It was built in 1968, so it is 57 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 620 vehicles a day, roughly 2% of them trucks, projected to reach 930 by 2042. The structure is 171 ft (52.1 m) long and 35 ft wide. If it were closed, the detour would be 46 mi (74 km).

Location

Open in Google Maps
CarriesStc 3811;FH 61 Rd.
CrossesS.Fk.Boise River
Location0.5S 0.4W Featherville
RouteCounty Highway 3811
CountyElmore County
StateIdaho
Coordinates43.604, -115.26588
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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating49.6 US tons
Inventory rating27.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length171 ft (52.1 m)
Longest span57 ft (17.4 m)
Deck width35 ft (10.8 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic620 (2023)
Projected traffic930 by 2042
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed46 mi (74 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Stc 3811;FH 61 Rd. over S.Fk.Boise River built?

It was built in 1968, making it 57 years old in 2025.

What condition is Stc 3811;FH 61 Rd. over S.Fk.Boise River 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 November 2024.

How much traffic does Stc 3811;FH 61 Rd. over S.Fk.Boise River carry?

About 620 vehicles per day (2023 count), of which roughly 2% are trucks.

How long is Stc 3811;FH 61 Rd. over S.Fk.Boise River?

The structure is 171 ft (52.1 m) long with a longest span of 57 ft (17.4 m) and a deck 35 ft wide.

Who owns Stc 3811;FH 61 Rd. over S.Fk.Boise River?

It is owned by the Other Local Agency.