US Bridges

2801: Chamberlain over East Fork Chamberlain CR

Fair

Powell County, Montana · 38 MI W of Missoula Mt · Structure no. 0000000L2133241

Built
2008
17 years old
Condition
Fair
inspected August 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
26 ft
1 main span
Daily traffic
25
2022 count
Owner
Federal
Bureau of Land Management

About this bridge

2801: Chamberlain over East Fork Chamberlain CR is a steel stringer/multi-beam or girder carrying 2801: Chamberlain over East Fork Chamberlain CR in Powell County, Montana. It was built in 2008, so it is 17 years old, younger than the Montana average of 47 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 25 vehicles a day, projected to reach 30 by 2042. The structure is 26 ft (7.8 m) long and 14 ft wide. If it were closed, the detour would be 2.5 mi (4 km).

Location

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Carries2801: Chamberlain
CrossesEast Fork Chamberlain CR
Location38 MI W of Missoula Mt
RouteFederal Lands Road 0
CountyPowell County
StateMontana
Coordinates46.9861, -113.24206
Functional classRural Local

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.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment3: Basically intolerable, requiring high priority of corrective action
Operating rating48.9 US tons
Inventory rating37.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckCorrugated steel
Main spans1
Design loadHS 25 or greater
Structure length26 ft (7.8 m)
Longest span24 ft (7.3 m)
Deck width14 ft (4.4 m)
Roadway width14 ft (4.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic25 (2022)
Projected traffic30 by 2042
Trucks—
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed2.5 mi (4 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerBureau of Land Management
Maintained byBureau of Land Management
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was 2801: Chamberlain over East Fork Chamberlain CR built?

It was built in 2008, making it 17 years old in 2025.

What condition is 2801: Chamberlain over East Fork Chamberlain CR 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 2024.

How much traffic does 2801: Chamberlain over East Fork Chamberlain CR carry?

About 25 vehicles per day (2022 count).

How long is 2801: Chamberlain over East Fork Chamberlain CR?

The structure is 26 ft (7.8 m) long with a longest span of 24 ft (7.3 m) and a deck 14 ft wide.

Who owns 2801: Chamberlain over East Fork Chamberlain CR?

It is owned by the Bureau of Land Management.