...DALLAS (Standard & Poor's) Aug. 24, 2015--Standard & Poor's Ratings Services assigned its '###' long-term rating to Austin, Texas' series 2015 taxable public improvement bonds, public improvement and refunding bonds, certificates of obligation, and public property finance contractual obligations. At the same time, Standard & Poor's affirmed its '###' long-term rating and underlying rating (SPUR) on the city's general obligation (GO) debt outstanding, as well as its '##+' long-term rating on Mueller Local Government Corp.'s existing appropriation debt, issued for Austin. The outlook is stable. Bond and certificate proceeds will be used to finance various capital improvements and to refund certain obligations outstanding for savings. "The ratings reflect our assessment of such factors as the city's very strong economy, very strong management, strong budgetary performance, very strong budgetary flexibility, and very strong liquidity," said Standard & Poor's credit analyst Lauren Spalten. The...