Montana Department of Transportation

Malcolm “Mack” Long, Director

COVID-19

View the Governor’s Coronavirus Task Force site for more information.

MDT News

MT 200 Erosion Wall Complete, Construction Pauses



East Missoula, Montana (March 22, 2021)  The Montana Department of
Transportation(MDT) and Missouri River Contractors have completed
work on an elaborate erosion prevention wall near Marshall Canyon in
East Missoula. Construction of the wall between MT 200 and the Clark
Fork River became necessary after heavy spring runoff and flooding in
2019 threatened the stability of the highway. 

The erosion alongside
and beneath some areas of the road was significant, John Schmidt,
MDT Construction Engineer, said.  We needed to respond quickly to
protect the riverbank and the highway from additional damage.	

MDT
and Missouri River Contractors launched the Old MT 200 Erosion Repair
project last summer. Construction included the installation of 55
steel beams that were secured to the soil with more than 200 tieback
supports. The face of the wall consists of 14 sections containing
more than 1,400 tons of concrete. This $4.6 million project was
funded with federal emergency relief dollars.  

The response we have
received from the community during this project has been great,
Schmidt said. We are aware that this area has recently endured a
significant amount of construction and we are grateful for the
cooperation and patience of the community as MDT works to make
improvements to area roadways. 

Several environmental factors were
considered before and during construction. Tree removal began in the
spring of 2020 in accordance with the Migratory Bird Treaty Act of
1918, which dictates the removal of trees before migratory birds
return to build their nests. 

The connection of Marshall Canyon Creek
to the Clark Fork occurs at this erosion repair site. The erosion
wall was engineered to accommodate a culvert containing a fish ladder
that provides access for trout to migrate from the Clark Fork River
to Marshall Canyon Creek. 

While this work and general construction
of the wall was underway, travel on MT 200 was limited to a single
lane. Since the completion of the erosion wall, the highway has been
reopened to two lanes of traffic, though speeds remain reduced near
Marshall Canyon Road. 

Crews will return later this spring to
complete the final paving, chip sealing, and striping of the highway.
Drivers can expect lane closures and short delays while the remainder
of the roadwork is completed.  

Those with questions about this
project may contact Kristine Fife at 
kristine@bigskypublicrelations.com or call the project hotline at
(406) 207-4484 during business hours. For more information, please
visit the project webpage at 
https://www.mdt.mt.gov/pubinvolve/oldmt200/. 

Alternative accessible
formats of this document will be provided on request. Persons who
need an alternative format should contact the Office of Civil Rights,
Department of Transportation, 2701 Prospect Avenue, PO Box 201001,
Helena, MT 59620. Telephone 406-444-5416 or Montana Relay Service at
711. 

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