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September 11, 2021 <br />Page 37 <br />Highway 10-A2: Grade -Separated Corridor <br />Highway 10-A2 includes a full reconstruction of Highway 10 from Armstrong Boulevard to the <br />Highway 10/101/169 interchange. The typical roadway section matches the segment under design <br />east of Armstrong Boulevard, a four -lane freeway with median barrier. This concept also includes <br />the construction of two interchanges and 2.5 miles of frontage road to maintain local access to the <br />new freeway. The cost for the interchanges including bridges, retaining wall, earthwork, drainage, <br />and right of way needs were taken from the Ramsey Boulevard/Highway 10 interchange cost <br />estimate. Improvements to the existing rest stop assume extensions of ramps in the lower cost <br />option and an interchange construction in the higher cost option based on previous cost estimates. <br />Frontage roads and associated right-of-way were estimated similarly to the Highway 10-Al Concept. <br />Figure 18: Highway 10-A2: Grade -Separated Corridor <br />m <br />DEPARTMENT OF <br />TRANSPORTATION <br />NORTHWEST METRO <br />Mississippi River Crossings <br />Feasibility Analysis <br />CONCEPT DEVELOPMENT <br />USTH so - az <br />Grade -separated Corridor <br />- + Primary interchange search area <br />Corridor improvement area <br />Roadway improvement area <br />Elk River is currently <br />leading a study of this <br />corridor considering <br />at -grade and grade - <br />separated solutions. <br />A <br />Northwest Metro Mississippi River Crossing Feasibility Analysis <br />