Agenda - Council - 09/14/2021 - Laserfiche WebLink

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Trott Brook Crossing EAW August 2021 3. Variolite Street NW and 173rd Avenue NW 4. Nowthen Boulevard NW and Ramsey Boulevard NW 5. Nowthen Boulevard NW and 167th Avenue NW 6. Nowthen Boulevard NW and 173rd Avenue NW 7. Nowthen Boulevard NW and 175th Avenue NW Peak hour turning movement counts were conducted at the above intersections on July 28th, 2021 and indicate the AM peak hour occurs at 7:00 AM — 8:00 AM, and the PM peak hour occurs at 4:30 PM to 5 : 30 PM. SSTS analyzed intersection operations using Synchro/Simtraffic, 11th Edition for the 2026 Build out year and for the 2040 Planning Horizon year. There are no improvement projects planned for the study area roadways and none were assumed for the No -Build or Build conditions. Effects on Traffic and Roadways The results of the analysis show that all intersections are expected to operate at acceptable LOS C or better with manageable vehicle queues for both the No -Build and Build conditions. However, the eastbound movement at the intersection of Ramsey Boulevard NW and Nowthen Boulevard NW will experience long delays during the 2040 PM peak time. Preliminary review of Peak Hour signal warrants and roundabout suggest they may be satisfied in the 2040 timeline. Further, preliminary safety analysis indicates this intersection has a higher crash rate than similar intersections in Minnesota. It is suggested this intersection be monitored to determine if safety improvements or traffic control changes should occur by 2040. Details are included in Appendix G. c. Identify measures that will be taken to minimize or mitigate project related transportation effects. As mentioned, the traffic analysis considered full build out by 2026 and evaluated conditions in 2026 and 2040. It is recommended 173rd Avenue NW include a dedicated right turn lane at its intersection with Nowthen Boulevard NW, and that the new intersection at 170th Avenue NW and Variolite Street NW include a northbound right turn lane and a southbound left turn by-pass lane. No other improvement or mitigation are necessary to provide adequate operations at the study area intersections. The site access is already provided with a northbound left turn by-pass lane and southbound right turn lanes from Nowthen Boulevard NW, and similar geometrics (northbound designated right turn lane and southbound left turn by-pass lane) are planned for the new access intersection to Variolite Street NW. The transportation system serving the area will have sufficient capacity to include traffic from the proposed project as well as other anticipated projects. 19. Cumulative Potential Effects Preparers can leave this item blank if cumulative potential effects are addressed under the applicable EAW Items. a. Describe the geographic scales and timeframes of the project related environmental effects that could combine with other environmental effects resulting in cumulative potential effects. 31