Fleshman Creek Flood Mitigation and Restoration Project

Fleshman Creek Application to FEMA

Fleshman Comprehensive Management Plan

Description of Fleshman Improvements(FONSI) 

The purpose of this project is to restore a two mile reach of Fleshman Creek, a tributary of the Yellowstone River near Livingston, Montana. Specific goals to prevent or eliminate severe and unacceptable damage to this natural resource include: 1) to mitigate risks to property and life associated with flooding hazards; 2) to restore Fleshman Creek aquatic and riparian habitat; 3) to improve Fleshman Creek water quality and quantity; and, 4) to enhance Fleshman Creek an important major tributary to the Yellowstone River, as a community resource and public amenity. In keeping with the Montana Fish, Wildlife and Parks fisheries program operation plan, this project would achieve the goal of “restoring and enhancing degraded habitat."

In the fall of 2005, the U.S. Army Corps of Engineers performed a detailed hydrologic analysis of the Fleshman Creek watershed and determined that the 100 year discharge of 856 cfs is significantly higher than the capacity of many culverts through which the creek flows throughout the City of Livingston. When Park County and the City of Livingston began discussing the proposed Fleshman Creek culvert replacement project with FEMA and Montana Disaster Emergency Services representatives, they were encouraged to take a holistic approach to restoring Fleshman Creek to a more natural and flood resistant state; to not only have the undersized culverts replaced but to make other improvements to the watershed as well. The 2 mile stretch of Fleshman Creek running through the City of Livingston faces the following challenges: 1) alterations to the discharge regime and stream channel have created degraded habitat which includes migration barriers for fish, sedimentation resulting in loss of fish spawning and macroinvertebrate habitat, locally unstable bank conditions and unnaturally wide channel geo- metries resulting in zones of shallow and slow stream flows; 2) the loss of the riparian zone has resulted in degraded water quality from non-point source pollution, bank instability, loss of macro-invertebrate and migratory bird habitat and decreased cover and food sources for fish from lack of low overhanging vegetation; and, 3) the urban runoff from discharge pipes has degraded water quality and habitat conditions. It is expected that achievement of the restoration goals detailed above, in addition to replacing the undersized culverts throughout the City of Livingston, will improve the channel’s ability to convey floodwater and resist degradation during flood events as well as improve aquatic and riparian habitat.

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