[8] The park's access to Riffe Lake, including boating and fishing, was diminished beginning in 2017 after Tacoma Power lowered water levels due to concerns of damages to downstream communities in the event of a 7.5-magnitude earthquake at Mossyrock Dam.

[9] Taidnapam Park is open during the entire year and provides for overnight camping, including for RV's, and visitors can access Riffe Lake for fishing and other recreational activities.

[14] Visitors can pass through the park and visit Mossyrock Dam or travel to a hiking trail to view a 248 foot (76 metres) tall waterfall known as Cathedral Falls.

Also known as Kosmos Flat, the 520-acre (210 ha) site contains a mix of habitats, such as meadow, riparian, and wetland, and is split by Rainey Creek.

The unit contains a small hardwood forest and is known for abundant wildlife, especially various species of birds including pheasants, ospreys, and raptors.