...Standard & Poor's Ratings Services revised the outlook on its '###+' long-term rating and underlying rating (SPUR) on Shreveport, La.'s water and sewer revenue debt to positive from stable. The outlook revision reflects our opinion of the improvement of the water and sewer system's liquidity to more-adequate levels in fiscal years 2014 and 2015, which we believe is likely sustainable. In the event liquidity were to continue to improve, and if management were to maintain adequate total debt service coverage (DSC) metrics while annual total debt service requirements increase, we could raise the rating over the outlook's two-year period. At the same time, Standard & Poor's assigned its '###+' long-term rating and positive outlook to the city's series 2015 water and sewer revenue and refunding bonds. Finally, Standard & Poor's affirmed its '###+' long-term rating and SPUR on the city's existing water and sewer revenue debt. The rating reflects our opinion of the system's:...