US Bridges

Bottle Bay RD over Sagle Slough

Fair

Bonner County, Idaho · 3.2 S. 0.8 E. Sandpoint · Structure no. 000000000030115

Built
1974
51 years old
Condition
Fair
inspected July 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
78 ft
1 main span
Daily traffic
2,800
2023 count
Owner
County
County Highway Agency

About this bridge

Bottle Bay RD over Sagle Slough is a prestressed concrete stringer/multi-beam or girder carrying Bottle Bay RD over Sagle Slough in Bonner County, Idaho. It was built in 1974, so it is 51 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 2,800 vehicles a day, roughly 9% of them trucks, projected to reach 4,200 by 2042. The structure is 78 ft (23.8 m) long and 26 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesBottle Bay RD
CrossesSagle Slough
Location3.2 S. 0.8 E. Sandpoint
RouteCounty Highway 0
CountyBonner County
StateIdaho
Coordinates48.23006, -116.53661
Functional classRural Minor 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 inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating30 US tons
Inventory rating18 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length78 ft (23.8 m)
Longest span77 ft (23.5 m)
Deck width26 ft (7.9 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,800 (2023)
Projected traffic4,200 by 2042
Trucks9%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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$1.1 million (2019 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Bottle Bay RD over Sagle Slough built?

It was built in 1974, making it 51 years old in 2025.

What condition is Bottle Bay RD over Sagle Slough 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 July 2023.

How much traffic does Bottle Bay RD over Sagle Slough carry?

About 2,800 vehicles per day (2023 count), of which roughly 9% are trucks.

How long is Bottle Bay RD over Sagle Slough?

The structure is 78 ft (23.8 m) long with a longest span of 77 ft (23.5 m) and a deck 26 ft wide.

Who owns Bottle Bay RD over Sagle Slough?

It is owned by the County Highway Agency.