To find the RV dump station, follow these directions: Take I-35 and exit onto Hwy. 79 East. Continue on Hwy. 79 East until you reach Hwy. 95. Turn North onto Hwy. 95. Then, take Farm Road (FM) 1331 and head East for approximately 7 miles. Look for the entrance of Granger Dam and turn Left. Take the next Left into the park.