Mattie V Creek Stream Channel Restoration

Mattie V Creek Stream Channel Restoration

Award: 2012 Engineering Excellence Award from the American Council of Engineering Companies of Montana, Environmental Category (ACEC)

Mattie V Creek had been heavily disturbed by changes in land use, specifically timber harvest, road development, and mining activities and was functionally disconnected from its mainstem Ninemile Creek. These changes in land use left Mattie V Creek with dredge piles and depressions that created fish barriers, caused a loss in favorable aquatic habitat, and disconnected the channel from the floodplain and Ninemile Creek.

In order to restore Mattie V Creek and reconnect it to Ninemile Creek, Morrison-Maierle managed and completed the stream channel restoration design project for a partnership led by Trout Unlimited, and including Lolo National Forest, and Missoula County. The stream channel improvements were designed using innovative techniques that incorporated features to accommodate energy dissipation in the context of the appropriate geomorphic setting.

This project restores the lower portions of Mattie V Creek which had become disconnected from Ninemile Creek and prohibited fish passage to spawning and rearing habitat in the upper portions of the watershed. The project reduces water temperatures, sediment input, and improves water quality in Ninemile Creek.

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