Yes, you can use black plastic for a dry creek bed; however, it will block air, nutrients and water from reaching the soil underneath. The soil may not support plants you want to grow alongside the dry creek bed, and weeds could grow from seeds and dirt that accumulate on top of the plastic.
About this Author
Lee Roberts has written professionally in different capacities throughout her career. She has written for not-for-profit and commercial entities since she received her B.A in sociology from the University of Michigan in 1986. She has been published on eHow.com. She is currently writing an extensive work of fiction.