Becca Palczynsky October 22, 2014 2014, GFL, Middle, OAS, U.S.A. Colorado River Running Dry Becca Palczynsky October 22, 2014 2014, GFL, Middle, OAS, U.S.A. Click on the image above to download the lesson. Description: Students will learn how human environment interaction has caused the Colorado River to become an endangered river. Grade level(s): Middle Standards: OAS, GFL Produced By: Glenda Sullivan