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The Bismarck City Commission will vote Tuesday on a $4.1 million development agreement for road, water and sewer improvements to accommodate a new Costco Wholesale warehouse and filling station.

If commissioners approve the request, the city would cover $2.1 million and Costco the remaining $2 million. The Washington state-based retailer plans to build a 157,500-square-foot facility and gas station in north Bismarck along Highway 83 and 57th Avenue Northeast.

City staff determined the area needed upgrades outside the proposed facility after reviewing a traffic impact study by SRF Consulting, a Minneapolis-based engineering consulting firm.

City Engineer Gabe Schell said if the agreement passes, the city will install turn lanes at intersections at Brookside Lane and 57th Avenue, along with a traffic signal at the intersection of 57th Avenue with Highway 83.

The agreement also would include installing city water and sewer lines in the right-of-way on Brookside Lane for Costco to connect to the proposed warehouse. The city also would upgrade Brookside Lane from a gravel ditch to a 48-foot-wide paved street with lighting, curb and gutter.