US Bridges

Stc 3938;ROSEBERRY over Cascade Reservoir

Fair

Valley County, Idaho · 1.3 S. 2.8 W. Donnelly · Structure no. 000000000020080

Built
1975
50 years old
Condition
Fair
inspected August 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
162 ft
2 main spans
Daily traffic
2,300
2023 count
Owner
County
County Highway Agency

About this bridge

Stc 3938;ROSEBERRY over Cascade Reservoir is a prestressed concrete stringer/multi-beam or girder carrying Stc 3938;ROSEBERRY over Cascade Reservoir in Valley County, Idaho. It was built in 1975, so it is 50 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 2,300 vehicles a day, roughly 1% of them trucks, projected to reach 3,450 by 2042. The structure is 162 ft (49.4 m) long and 31 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

Open in Google Maps
CarriesStc 3938;ROSEBERRY
CrossesCascade Reservoir
Location1.3 S. 2.8 W. Donnelly
RouteCounty Highway 3938
CountyValley County
StateIdaho
Coordinates44.71233, -116.13639
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.
Superstructure7 GoodSome minor problems.
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 inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
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 adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating65 US tons
Inventory rating39 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length162 ft (49.4 m)
Longest span78 ft (23.8 m)
Deck width31 ft (9.4 m)
Roadway width30 ft (9.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,300 (2023)
Projected traffic3,450 by 2042
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed9.9 mi (16 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Stc 3938;ROSEBERRY over Cascade Reservoir built?

It was built in 1975, making it 50 years old in 2025.

What condition is Stc 3938;ROSEBERRY over Cascade Reservoir 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 3938;ROSEBERRY over Cascade Reservoir carry?

About 2,300 vehicles per day (2023 count), of which roughly 1% are trucks.

How long is Stc 3938;ROSEBERRY over Cascade Reservoir?

The structure is 162 ft (49.4 m) long with a longest span of 78 ft (23.8 m) and a deck 31 ft wide.

Who owns Stc 3938;ROSEBERRY over Cascade Reservoir?

It is owned by the County Highway Agency.