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Schuyler, Nebraska Platte River and Shell Creek –

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Schuyler, Nebraska Platte River and Shell Creek – Schuyler, Nebraska Platte River and Shell Creek – Section 205 Flood Risk Management Feasibility Report and Environmental Assessment with Finding of No Significant Impact SEPTEMBER 2011 EXECUTIVE SUMMARY The project area is located along a reach of the Platte River near Schuyler, Nebraska, which is the county seat for Colfax County. The Platte River is located approximately 1.5 miles south of the city. Lost Creek, a minor tributary of the Platte River, runs along the southern edge of the community. Another tributary to the Platte River, Shell Creek, lies to the north and east of Schuyler. Most of the land surrounding Schuyler is used for agricultural purposes. Schuyler is subject to flooding from the Platte River / Lost Creek and Shell Creek. A major Shell Creek flood did extensive damage to property in northeastern Schuyler in May 2008 and a smaller flood did significant damage again in 2010, just as residents were completing repairs from the earlier flood. Southern Schuyler was also impacted by flooding from Lost Creek, a tributary to the Platte River during the 2010 Shell Creek flood. The current FEMA Flood Insurance Rate Map for Schuyler notes that portions of the city are within the 100-year (1% annual chance of exceedance) floodplains of both Shell Creek and the Platte River. A draft flood insurance rate map developed by the Corps for FEMA now indicates that the Platte River 100-year floodplain will extend well into heavily developed areas of Schuyler – areas which had not previously been designated as lying within the 100-year floodplain. The new area includes the downtown section. According to recent analysis, 684 residential structures lie within the 100-year floodplain and 830 residences lie within the 500- year floodplain at Schuyler. A thorough Feasibility study has been conducted to determine the recommended plan for addressing the flooding problem in Schuyler. The study evaluated structural and nonstructural measures including a detailed analysis of four different levee alternatives along Shell Creek and three different Platte River/Lost Creek levee alternatives. The analysis examined flood risk reduction measures over a range of flood frequencies for both threats. Pursuant to NEPA and USACE planning guidance, formulation of plans must considered environmental effects (EQ account) including avoidance, minimization, and mitigation of environmental impacts. Results from this feasibility study indicate that levees to protect Schuyler from both Shell Creek and the Platte River are economically feasible. Based on the feasibility study analysis Shell Creek levee Alternative SC-C and Platte River/Lost Creek levee Alternative PR-A were selected as the recommended plans. The plans once implemented would include 5.6 miles of levees and some channel shaping /cleanout. The combined plan provides flood risk management at the 1% annual exceedance level to 207 structures in northeast Schuyler and 559 structures in the southern portion of Schuyler that are within the 100-year floodplain, resulting in an expected reduction in annual damages of $1,900,000. The cost of construction, including real estate is estimated at $9,868,000, which will be cost shared 65/35 with the local sponsor. The preferred plan has an estimated net annual benefit to the nation of $1,386,290 and a benefit to cost ratio of approximately 3.7 to 1. An environmental assessment was conducted, which resulted in a finding of no significant impact (FONSI), resulting in a conclusion that no environmental impact statement will be needed. TABLE OF CONTENTS Table of Contents 1. STUDY BACKGROUND ...................................................................................................... 1 1.1 STUDY AUTHORITY AND PURPOSES ...................................................................... 1 1.1.1 Authority ................................................................................................................... 1 1.1.2 Sponsorship and Cost Sharing .................................................................................. 1 1.1.3 Purpose and Need ..................................................................................................... 1 1.2 PROJECT LOCATION.................................................................................................... 1 1.2.1 Study Area Location and Description ....................................................................... 1 1.2.2 Congressional District ............................................................................................... 5 1.3 STUDY BACKGROUND ............................................................................................... 5 1.3.1 Physical Setting ......................................................................................................... 5 1.3.2 History of Flooding ................................................................................................... 5 1.3.3 Study History .......................................................................................................... 11 1.3.4 Relationship to Prior Studies and Existing Water Projects ..................................... 11 2. EXISTING CONDITIONS ................................................................................................... 15 2.1 EXISTING CONDITIONS FOR FLOODING .............................................................. 15 2.1.1 Hydrology ............................................................................................................... 15 2.1.2 Existing Conditions Hydraulic Model .................................................................... 24 2.1.3 Platte River / Lost Creek Structure ......................................................................... 31 2.1.4 Floodplain Issues and Regulation ........................................................................... 32 2.2 GENERAL ENGINEERING EXISTING CONDITIONS ............................................ 37 2.2.1 Soils and Geotechnical Engineering Existing Conditions ...................................... 38 2.2.2 Hazardous, Toxic and Radiological Waste (HTRW) ............................................. 41 2.3 ENVIRONMENTAL EXISTING CONDITIONS ........................................................ 41 2.3.1 Climate .................................................................................................................... 41 2.3.2 Physiography, Soil Conditions and General Land Use ........................................... 42 2.3.3 Water Quality .......................................................................................................... 43 2.3.4 Vegetation and Terrestrial Habitat .......................................................................... 44 2.3.5 Wetlands ................................................................................................................. 44 2.3.6 Fish and Wildlife..................................................................................................... 48 2.3.7 Threatened and Endangered Species and State-Listed Species of Concern ........... 49 2.4 COMMUNITY EXISTING CONDITIONS .................................................................. 50 Platte River and Shell Creek Section 205 i Flood Risk Management Schuyler, Nebraska 2.4.1 Economic Existing Conditions ............................................................................... 50 2.4.2 Cultural Resources .................................................................................................. 52 2.4.3 Recreational Resources ........................................................................................... 55 2.4.4 Real Estate and Utilities .......................................................................................... 57 2.4.5 Relationship of this Project to Other Community Projects and Plans .................... 58 3. FUTURE WITHOUT-PROJECT CONDITIONS ................................................................ 60 3.1 FUTURE FLOODING CONDITIONS ......................................................................... 60 3.1.1 Hydrology and Flood Frequency ............................................................................ 60 3.1.2 Hydraulics and Channel Stability ........................................................................... 60 3.1.3 Floodplain Management ......................................................................................... 62 3.1.4 Embankments and Agricultural Levees .................................................................. 62 3.2 ENVIRONMENTAL FUTURE CONDTIONS ............................................................. 63 3.2.1 Climate Change ....................................................................................................... 63 3.2.2 Ecosystem ............................................................................................................... 63 3.3 FUTURE COMMUNITY CONDITIONS ..................................................................... 64 3.3.1 Future Without-Project Condition Economic Analysis .......................................... 64 3.3.2 Impacts of Future Flooding on Community Stability ............................................. 68 3.3.3 Recreational Outlook under Future Without-Project Conditions ........................... 68 4. PLANNING, PROBLEMS, OPPORTUNITIES, CONSTRAINTS, GOALS AND OBJECTIVES ............................................................................................................................... 70 4.1 PROBLEMS ..................................................................................................................
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