Petition created to protect, keep Mud Creek Loop in McAllister Park natural A city-proposed trail extension has many residents worried it will ruin the environment and all-natural trail they enjoy as is Tags: Petition created to protect, keep Mud Creek Loop in McAllister Park natural SAN ANTONIO – There’s a petition underway to stop the City of San Antonio from paving a trail in McAllister Park’s all-natural Mud Creek Loop portion. People who oppose the paved trail said they want to preserve one of the last remaining all-natural trails in the city. “I’m not saying don’t do the greenway at all. I’m asking please route it in an area that doesn’t have so much impact on the natural environment,” said Marjesca Brown, who created the petition.