Grand Lake is a natural lake located in the Rocky Mountains of Colorado. The lake has a long history, with Native American tribes using it as a hunting and fishing ground for centuries. During the late 1800s, the area around the lake was settled and transformed into a tourist destination, with steamboats and hotels catering to visitors. Today, Grand Lake is a popular destination for fishing, boating, and hiking.

The lake is fed by several streams, including the North Inlet and the Tonahutu Creek. Its waters flow into the Colorado River, making it an important part of the state's hydrology. Snowpack in the surrounding mountains is a significant source of water for the lake, and the Colorado-Big Thompson project diverts water from the lake to provide irrigation for agricultural land in northeastern Colorado. Despite its many uses, Grand Lake remains a pristine natural resource that is treasured by locals and visitors alike.