When that Denver summer sun starts beating down, there is nothing like retreating to a local oasis for a dip in a lake or reservoir to stay cool. This summer, though, popular Chatfield State Park in Littleton won’t be an option for folks in the metro area. Because of a construction project related to the expansion of reservoir capacity at the park, the popular swim beach will be closed for the summer. To meet the need for increased water storage required by an increasing population in the Front Range, park managers are preparing for a substantial rise in the reservoir’s water level.