US Bridges

Fdr 839 over Logging Creek

Fair

Cascade County, Montana · 13.5 Mi. W. US89/839 JCT · Structure no. 011507000001005

Built
1956
69 years old, rebuilt 1996
Condition
Fair
inspected July 2024
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
33 ft
1 main span
Daily traffic
46
1990 count
Owner
Federal
U.S. Forest Service

About this bridge

Fdr 839 over Logging Creek is a wood or timber stringer/multi-beam or girder carrying Fdr 839 over Logging Creek in Cascade County, Montana. It was built in 1956 and reconstructed in 1996, so it is 69 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 46 vehicles a day, projected to reach 100 by 2000. The structure is 33 ft (10 m) long and 15 ft wide. If it were closed, the detour would be 98.2 mi (158 km).

CarriesFdr 839
CrossesLogging Creek
Location13.5 Mi. W. US89/839 JCT
RouteFederal Lands Road 839
StateMontana
Coordinates47.09656, -111.01545
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJuly 2024
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 geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating20.4 US tons
Inventory rating15.8 US tons

Structure

MaterialWood or Timber
DeckWood or timber
Main spans1
Design loadHS 20
Structure length33 ft (10 m)
Longest span31 ft (9.4 m)
Deck width15 ft (4.7 m)
Roadway width14 ft (4.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic46 (1990)
Projected traffic100 by 2000
Trucks—
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.2 mi (158 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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$85,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Fdr 839 over Logging Creek built?

It was built in 1956, making it 69 years old in 2025. It was reconstructed in 1996.

What condition is Fdr 839 over Logging 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 July 2024.

How much traffic does Fdr 839 over Logging Creek carry?

About 46 vehicles per day (1990 count).

How long is Fdr 839 over Logging Creek?

The structure is 33 ft (10 m) long with a longest span of 31 ft (9.4 m) and a deck 15 ft wide.

Who owns Fdr 839 over Logging Creek?

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