US Bridges

Marshall Lake RD over W Fk Clearwater

Good

Missoula County, Montana · Marshall Lk · Structure no. 011606000000093

Built
2008
17 years old
Condition
Good
inspected October 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
76 ft
1 main span
Daily traffic
50
1998 count
Owner
Federal
U.S. Forest Service

About this bridge

Marshall Lake RD over W Fk Clearwater is a prestressed concrete stringer/multi-beam or girder carrying Marshall Lake RD over W Fk Clearwater in Missoula 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 good condition with a lowest component rating of 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 50 vehicles a day, projected to reach 75 by 2045. The structure is 76 ft (23.3 m) long and 16 ft wide. If it were closed, the detour would be 98.2 mi (158 km).

Location

Open in Google Maps
CarriesMarshall Lake RD
CrossesW Fk Clearwater
LocationMarshall Lk
RouteFederal Lands Road 463
CountyMissoula County
StateMontana
Coordinates47.2525, -113.5834
Functional classRural Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating42.5 US tons
Inventory rating33.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadHS 20
Structure length76 ft (23.3 m)
Longest span74 ft (22.6 m)
Deck width16 ft (5 m)
Roadway width14 ft (4.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (1998)
Projected traffic75 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 Marshall Lake RD over W Fk Clearwater built?

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

What condition is Marshall Lake RD over W Fk Clearwater in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in October 2024.

How much traffic does Marshall Lake RD over W Fk Clearwater carry?

About 50 vehicles per day (1998 count).

How long is Marshall Lake RD over W Fk Clearwater?

The structure is 76 ft (23.3 m) long with a longest span of 74 ft (22.6 m) and a deck 16 ft wide.

Who owns Marshall Lake RD over W Fk Clearwater?

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