Native fishes of the upper Colorado River UCR basin are declining in abundance. Alteration of the natural riverine environment during the last 100 years by human actions including physical alterations and the introduction of nonnative species. Changes in the physical and biological characteristics of riverine habitat have contributed to the endangerment of four native fish species Colorado (pikeminnow, humpback chub, bonytail, and razorback sucker)....

This report summarizes the results of an analysis of nitrate concentrations in the South Platte River between Chatfield Dam and the Burlington Ditch headgate (Upper South Platte Segments 6c and 14). The analysis is applicable to present and future conditions. Because the context for the analysis is a TMDL for nitrate, all influences on loads and concentrations of nitrate are taken into account as fully as possible on the basis of monitoring data,...