High Quality Content by WIKIPEDIA articles! White Rock Creek is a 30 mile (48.3 km) creek (cf. river) in the Elm Fork Trinity River watershed. From its headwaters near Frisco, Texas, it runs south-by-south-east through suburban Dallas for 23.5 miles (37.8 km) where it widens into White Rock Lake, then continues south for another 8 miles (12.9 km) to its mouth on the Trinity River, of which it is a major tributary.Despite running through one of the most populous areas of the world, and flowing under many major roads and highways, its banks remain heavily wooded and undisturbed in many places and many local parks are situated among its watershed, which is generally considered to extend 2 to 2.5 miles (3.2 to 4 km) either side of its path.