John Martin Reservoir

John Martin Reservoir is a large water body in Colorado created by an earth-fill dam that holds back water across a wide area. The shoreline features sandy banks and open spaces where visitors can camp, picnic, and explore walking paths throughout the grounds.

Construction of the dam started in 1939 but paused during World War II before water operations began in 1943. The project was built to manage flooding and support irrigation for local agriculture in the region.

The area holds traces of old frontier trails where traders and explorers once traveled along the Arkansas River. Visitors walking the grounds can sense this historical connection to early American expansion and movement across the plains.

The area is open year-round with camping and picnic spots scattered throughout, making it easy to find a place to settle in. The terrain is fairly flat and walkable for most visitors, though some paths can become muddy after rain.

The water body serves as a major stopping point for migrating birds and hosts hundreds of bird species including rare raptors. Fall and spring bring particularly large flocks that attract birdwatchers and nature enthusiasts to the shoreline.

Location: Colorado

GPS coordinates: 38.06600,-102.95400

Latest update: December 8, 2025 19:55