US Bridges

Stc 5786;COLBURN over Pack River

Fair

Bonner County, Idaho · 10.3 Ne. Sandpoint · Structure no. 000000000020640

Built
1951
74 years old
Condition
Fair
inspected July 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
122 ft
3 main spans
Daily traffic
1,300
2023 count
Owner
County
County Highway Agency

About this bridge

Stc 5786;COLBURN over Pack River is a steel continuous stringer/multi-beam or girder carrying Stc 5786;COLBURN over Pack River in Bonner County, Idaho. It was built in 1951, so it is 74 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 1,300 vehicles a day, roughly 9% of them trucks, projected to reach 1,950 by 2042. The structure is 122 ft (37.2 m) long and 28 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

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CarriesStc 5786;COLBURN
CrossesPack River
Location10.3 Ne. Sandpoint
RouteCounty Highway 5786
CountyBonner County
StateIdaho
Coordinates48.37083, -116.43992
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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating40.7 US tons
Inventory rating24.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length122 ft (37.2 m)
Longest span82 ft (25 m)
Deck width28 ft (8.4 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,300 (2023)
Projected traffic1,950 by 2042
Trucks9%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 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$2.4 million (2019 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Stc 5786;COLBURN over Pack River built?

It was built in 1951, making it 74 years old in 2025.

What condition is Stc 5786;COLBURN over Pack 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 July 2023.

How much traffic does Stc 5786;COLBURN over Pack River carry?

About 1,300 vehicles per day (2023 count), of which roughly 9% are trucks.

How long is Stc 5786;COLBURN over Pack River?

The structure is 122 ft (37.2 m) long with a longest span of 82 ft (25 m) and a deck 28 ft wide.

Who owns Stc 5786;COLBURN over Pack River?

It is owned by the County Highway Agency.