Hundreds of creeks and streams and several rivers originate within the park. The streams at higher elevation are often directly supplied by meltwater from glaciers, and they carry finely ground rock particles commonly referred to as glacial flour. Turning the water a turquoise hue at times, this finely ground powder remains suspended in lakes the creeks flow into, also causing some of them to appear turquoise. Thunder Creek is particularly well known for this attribute, as it is supplied melt water from dozens of glaciers and transports the suspended particles into Diablo Lake.