JACKSON, Wyo. (AP) — A new federal study says a tributary of the Snake River that's heavily flanked by development has high levels of algae.The report by the U.S. Geological Survey assesses water quality and biological health of Fish Creek. The creek, in the Wilson area of Jackson Hole, courses through agricultural lands and past mansions and a golf course. Cheryl Eddy-Miller is chief author of the report, she says Fish Creek is almost entirely lined by private land.  She says it shows nitrates in both Fish Creek and in area groundwater. She says the nitrate is coming from septic/sewage effluent or manure, or a mixed source.