Nearly three inches of rain turned the Isabel Rodeo arena into a sloppy, muddy mess for last weekend’s South Dakota Rodeo Association-sanctioned event. Rain or shine, the show must go on and once again the competitors did not disappoint, providing the packed grandstand with plenty of thrills and spills. At left, Clay Longbrake of Howes grits his teeth during a 68 point saddle bronc ride on Saturda…