Existing odour control methods for manure lagoons are cost intensive. Economical and effective covering methods for manure lagoons need to be studied and developed. This study demonstrated that a balloon-type manure lagoon cover could be an economical and effective method in reducing odour emission to the atmosphere. In this balloon type cover, a plastic tarp was tightened around perimeter, and inflated on the top, of a lagoon using a low pressure blower. The perimeter of the tarp was airtight. That way, odour was confined within the lagoon and the emission of odour into the atmosphere was minimized. Technical aspects such as proper installation and sealing of perimeters for the cover were tested. Critical pressures (minimum operating pressures to prevent flapping of the tarp) versus wind were determined. The cover effectively eliminated the odour emission to atmosphere and improved the landscape. The cover cost was approximately $6,000, which is considered to be much less expensive compared to solid structure covers such as steel and wood. It is expected that the cover to be used for earthen lagoons if a concrete foundation around the lagoon perimeter is constructed.