US Bridges

473 Keeler/Rattle over West Fork Keeler Creek

Fair

Lincoln County, Montana · West Fork Keeler Creek · Structure no. 011404000000166

Built
1957
68 years old
Condition
Fair
inspected August 2023
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
35 ft
1 main span
Daily traffic
50
1995 count
Owner
Federal
U.S. Forest Service

About this bridge

473 Keeler/Rattle over West Fork Keeler Creek is a wood or timber stringer/multi-beam or girder carrying 473 Keeler/Rattle over West Fork Keeler Creek in Lincoln County, Montana. It was built in 1957, so it is 68 years old, older 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 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 50 vehicles a day, projected to reach 75 by 2045. The structure is 35 ft (10.7 m) long and 18 ft wide. If it were closed, the detour would be 69.6 mi (112 km).

Carries473 Keeler/Rattle
CrossesWest Fork Keeler Creek
LocationWest Fork Keeler Creek
RouteFederal Lands Road 473
StateMontana
Coordinates48.33183, -116.01164
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection4 PoorAdvanced section loss, deterioration, spalling or scour.
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 geometry8: Equal to present desirable criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating33.2 US tons
Inventory rating25.4 US tons

Structure

MaterialWood or Timber
DeckWood or timber
Main spans1
Design loadUnknown
Structure length35 ft (10.7 m)
Longest span33 ft (10.2 m)
Deck width18 ft (5.4 m)
Roadway width16 ft (4.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (1995)
Projected traffic75 by 2045
Trucks—
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed69.6 mi (112 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerU.S. Forest Service
Maintained byU.S. Forest Service
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was 473 Keeler/Rattle over West Fork Keeler Creek built?

It was built in 1957, making it 68 years old in 2025.

What condition is 473 Keeler/Rattle over West Fork Keeler Creek 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 473 Keeler/Rattle over West Fork Keeler Creek carry?

About 50 vehicles per day (1995 count).

How long is 473 Keeler/Rattle over West Fork Keeler Creek?

The structure is 35 ft (10.7 m) long with a longest span of 33 ft (10.2 m) and a deck 18 ft wide.

Who owns 473 Keeler/Rattle over West Fork Keeler Creek?

It is owned by the U.S. Forest Service.