US Bridges

Colburn Culver RD over Pack River

PoorPosted for load

Bonner County, Idaho · 1.0 N. 4.0 E. Colburn · Structure no. 000000000030235

Built
1941
84 years old
Condition
Poor
inspected July 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
96 ft
1 main span
Daily traffic
870
2023 count
Owner
County
County Highway Agency

About this bridge

Colburn Culver RD over Pack River is a steel stringer/multi-beam or girder carrying Colburn Culver RD over Pack River in Bonner County, Idaho. It was built in 1941, so it is 84 years old, older than the Idaho average of 45.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: posted for load restriction.

It carries about 870 vehicles a day, roughly 13% of them trucks, projected to reach 1,305 by 2042. The structure is 96 ft (29.3 m) long and 24 ft wide. If it were closed, the detour would be 8.7 mi (14 km).

Location

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CarriesColburn Culver RD
CrossesPack River
Location1.0 N. 4.0 E. Colburn
RouteCounty Highway 0
CountyBonner County
StateIdaho
Coordinates48.40758, -116.47808
Functional classRural Minor Collector

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2024
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation4: Meets minimum tolerable limits to be 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 rating36 US tons
Inventory rating21.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckWood or timber
Main spans1 (+1 approach)
Design loadH 15
Structure length96 ft (29.3 m)
Longest span75 ft (22.9 m)
Deck width24 ft (7.3 m)
Roadway width23 ft (6.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic870 (2023)
Projected traffic1,305 by 2042
Trucks13%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.7 mi (14 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 million (2019 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Colburn Culver RD over Pack River built?

It was built in 1941, making it 84 years old in 2025.

What condition is Colburn Culver RD over Pack River in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in July 2024.

How much traffic does Colburn Culver RD over Pack River carry?

About 870 vehicles per day (2023 count), of which roughly 13% are trucks.

How long is Colburn Culver RD over Pack River?

The structure is 96 ft (29.3 m) long with a longest span of 75 ft (22.9 m) and a deck 24 ft wide.

Who owns Colburn Culver RD over Pack River?

It is owned by the County Highway Agency.