(plaintiff, environmental activist group, sued under Administrative Procedure Act to stop federal government from diverting water in creek due to fears of possibility that native salmon population might thin out in violation of state (WA) water law; court determined that plaintiff lacked standing because federal law does not permit private parties lacking water rights to compel enforcement of state law against U.S. government; court noted that WA Dept. of Ecology has never determined that periodic closure of gates at creek violated state water laws or requires permit).