US Bridges

Stc 3811;FH61 RD over S.Fk.Boise River

Fair

Elmore County, Idaho · 3.9 N. 1.1 E. Pine · Structure no. 000000000027870

Built
1963
62 years old
Condition
Fair
inspected November 2024
Type
Tee Beam
Concrete
Length
201 ft
5 main spans
Daily traffic
620
2023 count
Owner
Local
Other Local Agency

About this bridge

Stc 3811;FH61 RD over S.Fk.Boise River is a concrete tee beam carrying Stc 3811;FH61 RD over S.Fk.Boise River in Elmore County, Idaho. It was built in 1963, so it is 62 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 620 vehicles a day, roughly 2% of them trucks, projected to reach 930 by 2042. The structure is 201 ft (61.3 m) long and 30 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

Open in Google Maps
CarriesStc 3811;FH61 RD
CrossesS.Fk.Boise River
Location3.9 N. 1.1 E. Pine
RouteCounty Highway 3811
CountyElmore County
StateIdaho
Coordinates43.53984, -115.28979
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 inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
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
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating60 US tons
Inventory rating36 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20
Structure length201 ft (61.3 m)
Longest span40 ft (12.2 m)
Deck width30 ft (9.1 m)
Roadway width24 ft (7.3 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
CrossesWaterway
Detour if closed6.8 mi (11 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$2.6 million (2020 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Stc 3811;FH61 RD over S.Fk.Boise River built?

It was built in 1963, making it 62 years old in 2025.

What condition is Stc 3811;FH61 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;FH61 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;FH61 RD over S.Fk.Boise River?

The structure is 201 ft (61.3 m) long with a longest span of 40 ft (12.2 m) and a deck 30 ft wide.

Who owns Stc 3811;FH61 RD over S.Fk.Boise River?

It is owned by the Other Local Agency.