US Bridges

Stc 3988;ROSEBERRY over Lake Fork

Fair

Valley County, Idaho · 0.8 W. Donnelly · Structure no. 000000000020075

Built
1965
60 years old
Condition
Fair
inspected August 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
103 ft
2 main spans
Daily traffic
3,200
2023 count
Owner
County
County Highway Agency

About this bridge

Stc 3988;ROSEBERRY over Lake Fork is a prestressed concrete stringer/multi-beam or girder carrying Stc 3988;ROSEBERRY over Lake Fork in Valley 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 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 3,200 vehicles a day, roughly 1% of them trucks, projected to reach 4,800 by 2042. The structure is 103 ft (31.4 m) long and 27 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesStc 3988;ROSEBERRY
CrossesLake Fork
Location0.8 W. Donnelly
RouteCounty Highway 3988
CountyValley County
StateIdaho
Coordinates44.73056, -116.09689
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating52 US tons
Inventory rating31 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length103 ft (31.4 m)
Longest span50 ft (15.2 m)
Deck width27 ft (8.3 m)
Roadway width22 ft (6.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,200 (2023)
Projected traffic4,800 by 2042
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$1.4 million (2021 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Stc 3988;ROSEBERRY over Lake Fork built?

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

What condition is Stc 3988;ROSEBERRY over Lake Fork 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 August 2023.

How much traffic does Stc 3988;ROSEBERRY over Lake Fork carry?

About 3,200 vehicles per day (2023 count), of which roughly 1% are trucks.

How long is Stc 3988;ROSEBERRY over Lake Fork?

The structure is 103 ft (31.4 m) long with a longest span of 50 ft (15.2 m) and a deck 27 ft wide.

Who owns Stc 3988;ROSEBERRY over Lake Fork?

It is owned by the County Highway Agency.