The Gravel Pits, often referred to as The Pit, is a former gravel quarry located at the southern end of the park. This freshwater site features artificial structures including a sunken sailboat, a toilet, and various training platforms linked by guide ropes. Divers can expect depths between 2 and 6 metres, with an average of 4 metres. Conditions include mild currents and visibility ranging from 5 to 9 metres. A thermocline is present at approximately 6 metres. Shore entry is standard, and the site is suitable for beginners. Hazards include boat traffic, cold water, entanglement risks, and low visibility. Facilities available on-site include parking, toilets, showers, and changing rooms.

Downtown Aquarium in the Denver Metro Reservoirs offers a unique freshwater diving experience within an artificial reef setting. The site features depths ranging from 3 to 9 metres, making it suitable for beginner divers and snorkellers. Access is via a shore entry, with visibility typically between 10 and 15 metres. Divers should be aware of the overhead environment and the presence of sharks within the facility. The site is well-supported by on-site facilities, including a dive shop, equipment rental, air fills, and a cafe. Guided tours are available for those looking to explore this controlled environment, with typical dives lasting approximately 30 minutes.

Aurora Reservoir is a popular freshwater training site featuring a dedicated scuba beach and a roped-off dive area on the eastern shore. The site is notable for a purpose-sunk Cessna 210 wreck, providing a practical environment for navigation and search and recovery training. Divers enter from the shore via a staircase located at the northeastern parking lot. Depths range from 1 to 6 metres, averaging 4 metres. Conditions include a distinct thermocline, with clearer water in the upper layers and murkier conditions below. Hazards include cold water, potential entanglement, and low visibility. Facilities include parking, toilets, showers, changing rooms, a rinse station, and gear storage.