Abstract: In general, mobile agricultural sprinkler machines can be used on smooth terrain only or under conditions permitting travel in a straight line. The apparatus of the present invention is a high pressure, self-propelled, mobile sprinkler which can take a circuitous route over rough terrain. Moreover, the apparatus of the present invention includes several safety features which reduce the likelihood of equipment damage. The safety features include an automatic drive stopping system which halts the sprinkler at a predetermined location. Also provided is a drive shutoff which is engaged if the hose of the apparatus become tangled. The invention also includes a brake for slowing the apparatus as it becomes lighter to prevent the apparatus lurching forward, thereby avoiding the problems of hose tangles and uneven water distribution.