04-18-2022 Agenda - Laserfiche WebLink

CASS COUNTY ROADWAY 18 EXTENSION STUDY – CASS COUNTY, ND 28 5.2.5 EXISTING ENVIRONMENTAL FEATURES The project study area has the Sheyenne River and the Sheyenne River tributary for flowing water. There are three primary locations for palustrine wetlands located in sections 23 and 26 of the Normanna Township. The locations that are within the roadway ditch section that are classified as wetlands are located in the section from the Sheyenne River bridge to the west approximately a 0.5 mile. 5.2.6 FLOODING IMPACTS The study area for this project is not located within the protected area of the Fargo-Moorhead Diversion and is typically referred to as being on the “wet” side of the diversion. The flooding impacts with the diversion for 10-year, 20-year, and 100-year storm events are shown in Figure 9. The roadway elevations shown in Figure 9 are based on the existing roadway elevations and will be considered with proposed roadway profile elevations in the Alternative Analysis phase of this project. As shown in Figure 9, 52nd Street SE holds back water that drains from the south to the north and creates flooding in area fields to the south of 52nd Street. The historic impacts to the roadway due to significant flooding events is shown in Figure 10. The information for Figure 10 was provided by Cass County based on their records and was verified by modeling information that was available from previous Cass County flooding projects. 5.2.7 IMPACTS TO AREA ROADWAYS Reviewing the most recent information available for the Fargo-Moorhead Diversion, 52nd Street SE in the study area will not be impacted by the construction of the diversion. The roadways in the area of this project that will be impacted are all to the north and east of the study area. County Road 18 east of Interstate 29 will be raised to allow access to Oxbow once the ring dike has been constructed. 5.2.8 TRAFFIC SAFETY PERFORMANCE There was a total of six traffic crashes in the study area from 2013 to 2017. The corridor had one fatal crash, two injury crashes, and three property damage only crashes from 2013 to 2017. The corridor experienced three angle crashes with two being right angle crashes; resulting in one a fatal crash and one property damage only crash. Based on the data collected for this study, three of the nine drivers involved in crashes were between 0 and 24 years of age which represents 33 percent of the total drivers. The 0 to 24 and 35 to 44 age ranges had three drivers involved in crashes which was the highest of all ranges. The fatal crash that occurred along the corridor was further examined to determine if any roadway or traffic control attributes may have been a contributing factor. Based on a review of the information available about the crash, a vehicle failed to yield at a yield sign to another vehicle on 52nd St. SE and a right-angle crash occurred between a passenger vehicle and a semi-truck. Based on the information available, it does not appear that any roadway or traffic control attributes contributed to the crash.