A mountable water spray shield device is shown herein. A rigid sheet, with an inverted, cropped tear-drop profile, is attached to a rear insert section, and is mounted to a designated vehicle within the area defined by the wheel well and between a pair of tires of the designated vehicle via a bracket secured to the undercarriage of the vehicle. During operation of the designated vehicle upon a wet roadway, the mountable water spray shield serves to divert water spray which would otherwise be emitted into the path of adjacent traffic by rotation of the tires upon the wet roadway at speed.