On a frozen Platte River covered with a blanket of snow darker areas signify the remaining thin strips of open water. These darker strips warmed by the sun during the day and narrow enough to keep slush from accumulating on the surface will likely stay open through the winter unless the temperature dips to abnormally low temperatures.
Taken 01-13-11 Hall County, NE

REF # : NE-2330 R-1 D3X 70-200MM