In this task, you are given a context paragraph, a question based on that and corresponding answer of a question. Your task is to generate supporting fact/knowledge from context paragraph which helps in answering a given question.

The Tongue River Dam (National ID # MT00002) is a dam in Big Horn County, Montana, a few miles north of the Wyoming state border. It impounds the Tongue River, creating the Tongue River Reservoir. Question: The Tongue River Dam impounds a tributary that is approximately how many miles long? Answer: 265
The Tongue River Dam National ID MT00002 is a dam in Big Horn County, Montana, a few miles north of the Wyoming state border.