US Bridges

5900 Jungle Cr.Rd. over West Fork Yaak River

Fair

Lincoln County, Montana · Just Past JCT With 338 · Structure no. 011404000000066

Built
1980
45 years old
Condition
Fair
inspected August 2023
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
40 ft
1 main span
Daily traffic
10
1994 count
Owner
Federal
U.S. Forest Service

About this bridge

5900 Jungle Cr.Rd. over West Fork Yaak River is a wood or timber stringer/multi-beam or girder carrying 5900 Jungle Cr.Rd. over West Fork Yaak River in Lincoln County, Montana. It was built in 1980, so it is 45 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 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 10 vehicles a day, projected to reach 15 by 2045. The structure is 40 ft (12.3 m) long and 16 ft wide. If it were closed, the detour would be 98.2 mi (158 km).

Location

Open in Google Maps
Carries5900 Jungle Cr.Rd.
CrossesWest Fork Yaak River
LocationJust Past JCT With 338
RouteFederal Lands Road 5900
CountyLincoln County
StateMontana
Coordinates48.96877, -115.86564
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
Deck8 Very GoodNo problems noted.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating35.7 US tons
Inventory rating27.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans1
Design loadHS 20
Structure length40 ft (12.3 m)
Longest span39 ft (11.9 m)
Deck width16 ft (4.9 m)
Roadway width14 ft (4.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10 (1994)
Projected traffic15 by 2045
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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was 5900 Jungle Cr.Rd. over West Fork Yaak River built?

It was built in 1980, making it 45 years old in 2025.

What condition is 5900 Jungle Cr.Rd. over West Fork Yaak 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 August 2023.

How much traffic does 5900 Jungle Cr.Rd. over West Fork Yaak River carry?

About 10 vehicles per day (1994 count).

How long is 5900 Jungle Cr.Rd. over West Fork Yaak River?

The structure is 40 ft (12.3 m) long with a longest span of 39 ft (11.9 m) and a deck 16 ft wide.

Who owns 5900 Jungle Cr.Rd. over West Fork Yaak River?

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