Umpqua River - Koepke Slough UV IndexUnited StatesORDouglas CountyUmpqua River - Koepke Slough1-Day3-Day Graph Plots Open in Graphs UV Forecast NOAAUmpqua River - Koepke Slough UV forecast issued yesterday at 12:18 pm. Next forecast at approx. 12:18 pm.Get WillyWeather+ to remove ads