River regulation has led to the growth of riparian zones along the Green River where they would not have developed naturally because of the erosive effects of floods. The reduction in flow changes has also caused a decline in amphibian habitat along the river. The dam traps the river's high sediment loads, which has been detrimental to many native fish stocks. The cold and clear water releases have caused loss of sandbars, bank erosion, and as a result crucial habitat of four species of native fish in parts of the Green River have been lost. On August 28, 2008, the Bureau of Reclamation prepared an EIS (Environmental Impact Statement) on the operation of the dam to meet the river flow required by Section 7 of the Endangered Species Act. The four native fishes affected are the razorback sucker, Colorado pikeminnow, humpback chub, and bonytail chub.