US Bridges

S.Fk.Yaak/Pipe Cr. over Yaak River

Poor

Lincoln County, Montana · JCT 68/92 Town of Yaak. · Structure no. 011404000000005

Built
1951
74 years old
Condition
Poor
inspected August 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
170 ft
5 main spans
Daily traffic
99
1993 count
Owner
Federal
U.S. Forest Service

About this bridge

S.Fk.Yaak/Pipe Cr. over Yaak River is a steel stringer/multi-beam or girder carrying S.Fk.Yaak/Pipe Cr. over Yaak River in Lincoln County, Montana. It was built in 1951, so it is 74 years old, older than the Montana average of 47 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.

It carries about 99 vehicles a day, projected to reach 99 by 1998. The structure is 170 ft (51.8 m) long and 25 ft wide. If it were closed, the detour would be 20.5 mi (33 km).

Location

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CarriesS.Fk.Yaak/Pipe Cr.
CrossesYaak River
LocationJCT 68/92 Town of Yaak.
RouteFederal Lands Road 68
CountyLincoln County
StateMontana
Coordinates48.83137, -115.70675
Functional classRural Local

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
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure8 Very GoodNo problems noted.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection9 ExcellentNo problems noted.
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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating77.2 US tons
Inventory rating59.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20
Structure length170 ft (51.8 m)
Longest span57 ft (17.4 m)
Deck width25 ft (7.5 m)
Roadway width20 ft (6.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic99 (1993)
Projected traffic99 by 1998
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed20.5 mi (33 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$150,000
NavigationNo navigation control on waterway

Frequently asked questions

When was S.Fk.Yaak/Pipe Cr. over Yaak River built?

It was built in 1951, making it 74 years old in 2025.

What condition is S.Fk.Yaak/Pipe Cr. over Yaak 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 August 2023.

How much traffic does S.Fk.Yaak/Pipe Cr. over Yaak River carry?

About 99 vehicles per day (1993 count).

How long is S.Fk.Yaak/Pipe Cr. over Yaak River?

The structure is 170 ft (51.8 m) long with a longest span of 57 ft (17.4 m) and a deck 25 ft wide.

Who owns S.Fk.Yaak/Pipe Cr. over Yaak River?

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