Maximum discharge along the river is currently at the reporting a streamflow rate of cfs. This is also the highest stage along the Rockcastle River, with a gauge stage of ft at this location. This river is monitored from 1 different streamgauging stations along the Rockcastle River, the highest being situated at an altitude of ft, the .

The Rockcastle River is located in southeastern Kentucky and runs for approximately 78 miles. It has a rich history, as evidence of prehistoric Native American settlements can be found along its banks. Additionally, the river played a significant role in the early development of Kentucky's coal mining industry.

The hydrology of the Rockcastle River is characterized by moderate to high flows, with frequent flooding during periods of heavy rainfall. Two major dams, the Renfro Dam and the Rockcastle Dam, were constructed along the river for hydroelectric generation and flood control purposes.

The Rockcastle River and its surrounding watershed provide important recreational opportunities for activities such as fishing, kayaking, and hiking. The river also supports agricultural activities, including livestock grazing and crop production in the surrounding farmland.