Saw this on the Longmont website Aug 2018

Camping

Camping is currently not available at Union Reservoir. In 2018, areas previously used for campsites were reconfigured to provide additional day use opportunities and additional parking during peak periods. In the future, design and construction of a modern campground with both tent and RV camping is planned. The campground is slated to have full hook ups, showers, flush toilets and a dump station. Learn more in the Union Reservoir & Trail Master Plan >