The outtake structure in Thomas Reservoir that holds a new 42-inch pipeline. Originally meant to be just a penstock, the pipeline is now viewed by city officials primarily as an emergency drain line.
Aspen Journalism (https://aspenjournalism.org/2012/06/04/aspen-defends-its-journey-from-penstock-to-drain-line/pipe-outtake-chris-council-photo/)