Union Reservoir

What to know before you go to Union Reservoir

The federal and state datasets behind this guide list no named beach at Union Reservoir. That does not mean there is no access, only that none is catalogued. If you need a named beach, Surprise Beach on Lake Granby is some 42 miles from here. Absence from these datasets does not mean the water is closed, only that no agency lists a beach.

Nearby water includes Boulder Reservoir (Colorado, 11 mi), Pinewood Reservoir (Colorado, 19 mi) and Standley Lake (Colorado, 21 mi). Colorado has 48 lakes on this site in total.

Season dates vary by park; the operating agency publishes them each spring. No public sensor reports water temperature at Union Reservoir, so the panel shows air temperature and wind. If the water looks like pea soup or paint, stay out and report it to the managing agency.

For a lake this size, the park office is the fastest way to learn how the water sits today. Nobody publishes a continuous level for Union Reservoir in a form this guide can read, so the page carries access and weather instead.