Highline Lake State Park in Mesa County, Colorado, centers on Highline Lake and Mack Mesa Lake, whose waters and surrounding habitat make the park especially known for birdwatching. Overlook kiosks offer views of migratory waterfowl and birds such as great blue heron, white pelicans, and whooping crane. The park also supports year-round fishing and remains open in winter for snowshoers and cross-country skiers. In 2022, it became the site of Colorado’s first confirmed zebra mussel infestation after Colorado Parks and Wildlife detected the species in September and confirmed an established population in October, classifying Highline Lake as infested.