The Union Reservoir Nature Area in Longmont, Colorado, is a picturesque recreational haven. This 736-acre body of water, originally named Calkins Lake, is a natural glacial lake and one of only a few in Colorado. The area offers a variety of activities, making it a popular destination for locals and visitors alike. Visitors can enjoy fishing, kayaking, paddleboarding, sailing, and even windsurfing. Swimming is allowed in designated areas, and there's a sandy beach for sunbathers as well as a designated dog beach. For those who prefer land-based activities, there are trails for hiking and biking that offer scenic views of the reservoir and the surrounding landscape. Wildlife enthusiasts will appreciate the chance to observe birds and other animals around the water. The area is also known for its truly stunning sunsets, providing an amazing end to a day spent outdoors.