MORRISON — Pushback against new construction in metro Denver is nothing new. But what’s happening in Morrison — where voters will soon have the opportunity to undo already-approved plans for a 1,350-home community at the doorstep of the historic town — is a sign that robust growth on the Front Range isn’t going to continue unchecked without a fight. The upcoming ballot measures to derail the Red Rocks Ranch project at the northeast corner of Morrison Road and C-470 come on the heels of a vote last summer by residents in Greenwood Village to scrap a plan to zone a 44-acre area near the Orchard Station light rail stop for a dense, mixed-use project.