US Bridges

Mormon Pk RD over Lolo CR

Fair

Missoula County, Montana · Mormon Pk · Structure no. 011603000000117

Built
1958
67 years old
Condition
Fair
inspected July 2023
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
80 ft
2 main spans
Daily traffic
50
Owner
Federal
U.S. Forest Service

About this bridge

Mormon Pk RD over Lolo CR is a wood or timber stringer/multi-beam or girder carrying Mormon Pk RD over Lolo CR in Missoula County, Montana. It was built in 1958, so it is 67 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 6 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 80 ft (24.3 m) long and 15 ft wide. If it were closed, the detour would be 98.2 mi (158 km).

Location

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CarriesMormon Pk RD
CrossesLolo CR
LocationMormon Pk
RouteFederal Lands Road 612
CountyMissoula County
StateMontana
Coordinates46.7434, -114.15609
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating45.3 US tons
Inventory rating35.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans2
Design loadHS 25 or greater
Structure length80 ft (24.3 m)
Longest span39 ft (11.9 m)
Deck width15 ft (4.7 m)
Roadway width14 ft (4.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (—)
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 Mormon Pk RD over Lolo CR built?

It was built in 1958, making it 67 years old in 2025.

What condition is Mormon Pk RD over Lolo CR 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 2023.

How much traffic does Mormon Pk RD over Lolo CR carry?

About 50 vehicles per day (latest count).

How long is Mormon Pk RD over Lolo CR?

The structure is 80 ft (24.3 m) long with a longest span of 39 ft (11.9 m) and a deck 15 ft wide.

Who owns Mormon Pk RD over Lolo CR?

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