04-18-2022 Agenda
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04-18-2022 Agenda
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<br /> CASS COUNTY ROADWAY 18 EXTENSION STUDY – CASS COUNTY, <br />ND <br /> <br />33 <br />7 ALTERNATIVE ANALYSIS <br />7.1 ALIGNMENT ALTERNATIVES <br />The alternatives included in this report were developed with input provided by the SRC members <br />throughout the project and attendees at the public input meeting. The alternatives were developed by <br />taking into consideration the potential impacts of erosion due to the Sheyenne River at areas adjacent to <br />the existing 52nd Street SE roadway and impacts to existing property owners along the roadway. The <br />alternatives included in this report were developed to a planning level and no topographical survey or <br />design level information was used. The alternatives are to be considered preliminary and for information <br />purposes only. <br /> <br />The banks of the Sheyenne River are susceptible to erosion due to water movement. The scope of this <br />study did not allow for geotechnical review or topographical survey of the river and the adjacent land. <br />Near the Sheyenne River crossing in the area of the Norman Lutheran Church, the Sheyenne River bank <br />is eroding and, dependent on future erosion to the river bank, may encroach on the existing 52nd Street <br />SE roadway ROW. The Sheyenne River bank erosion near the 52nd Street SE roadway ROW is a <br />significant consideration in the roadway alignments for the Sheyenne River Crossing and Relocate <br />Church Alternative that are off the existing roadway alignment. <br />7.1.1 EXISTING ALIGNMENT ALTERNATIVE (THE NO-BUILD ALTERNATIVE) <br />The Existing Alignment Alternative serves as the no-build alternative for the study. This alternative would <br />include no physical changes to the roadway and continuance of the existing maintenance activities for the <br />roadway. The ownership of the roadway by the Townships or the County does not alter this alignment <br />alternative. The existing 52nd Street SE alignment and typical section are shown in Figure 1 and Figure <br />2. Also included in Figure 2 is the typical section for existing CR 18 east of the study area. <br /> <br />Three typical sections are shown in Figure 2; one for the existing aggregate surfaced roadway section on <br />52nd Street SE throughout the study area, CR 18 for the section within 2 miles of CR17, and one for the <br />bridge section across the Sheyenne River. The 52nd Street SE roadway section is currently an aggregate <br />surface with open ditch drainage along both the north and south sides of the roadway. As shown in <br />Figure 2, the roadway, ditch, and ROW widths vary based on the location within the corridor, but the <br />aggregate surface is typically 28 to 30 feet wide. The CR 18 typical section is similar to the 52nd Street <br />SE typical section with a slightly wider aggregate surface of approximately 30 to 32 feet. <br />7.1.2 EXISTING ALIGNMENT WITH CASS COUNTY TYPICAL ROADWAY <br />SECTION ALTERNATIVE <br />The Existing Alignment with Cass County Typical Roadway Section Alternative maintains the roadway on <br />the existing alignment, but reconstructs the typical section to the Cass County typical roadway section for <br />either an aggregate or paved roadway. The Cass County aggregate and paved surface typical roadway <br />sections are shown in Figure 14. The roadway alignment for this alternative is shown in Figure 15. The <br />Cass County typical roadway sections’ ROW is wider than the existing 52nd Street SE typical roadway <br />section. The driving surface for the county typical aggregate surface roadway section is approximately <br />the same width as the existing aggregate surface of 52nd Street SE and the driving surface for the county <br />typical paved surface roadway is two feet wider than the existing aggregate surface of 52nd Street SE. In
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