The manuscript describes a community-based mathematical modeling task that was implemented in a Calculus I classroom to engage students in mathematical modeling. Twenty-five undergraduate students engaged in this activity. These students selected a context that they found interesting, posed questions, developed constraints, came up with solution strategies, checked their strategies for effectiveness, and revised their work. In going through the various parts of the modeling activity, the students experienced the various characteristics of community-based mathematical modeling. The task, its implementation, and opportunities for students' learning are shared.