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Rush River Watershed

Sponsor: Cass County Joint Water Resource District


The purpose of the proposed action is to reduce the flood risk for the city of Amenia by removing surface water inundation from the Rush River during the 1-percent-annunal-chance flood, within city limits.

Amenia has historic flood risks with overbank flooding from the Rush River, ice jams, and overland flooding.  Additionally, preliminary FEMA flood insurance rate maps (FIRMs) indicate that much of the city will be included in the 100-year and 500-year floodplain.  Therefore, homeowners and businesses with federally backed mortgages would be required to purchase flood insurance on their properties if the preliminary FIRMs are adopted.  With the rising costs associated with flood insurance, this is a considerable permanent expense for property owners without certified flood protection.

The preferred alternative proposes to construct approximately 11,820 feet of levee around the city of Amenia to provide flood protection to residents during a 100-year, 24-hour event. A 10-foot-wide channel would be constructed approximately 15 feet from the toe of the levee as an additional measure of protection from flood flows. A stormwater pond would be developed to capture floodwaters and runoff of approximately 180 surface acres within the levee system. The proposed alternative would also include constructing removable features to act as temporary levees over three road crossings and two railroad crossings.

Total Installation Cost:              $3,282,200
Federal (NRCS) Contribution:  $2,576,600

Rush River Watershed

Current Status

The Watershed Plan/Environmental Assessment is final and ND NRCS has issued a Finding of No Significant Impact.  NRCS and the Cass JWRD have signed the watershed agreement and the NRCS Chief has formally authorized the watershed project.  Final engineering design is progressing and is expected to be completed in 2023.  After approval of the design, construction will be scheduled at a date to be determined by the Cass County JWRD.