• River: Purgatoire River
• Length: 11 Miles
• Surface Area: 800 Acres
• Volume: 30,815 Acre Feet
• Drainage Area: 671 Square Miles
Trinidad Lake State Park is a state park 4 miles (6.4 km) west of Trinidad, Colorado, United States. The park protects Trinidad Lake, a dammed reservoir. There are hiking trails, and camping and boating opportunities. The park features historical attractions such as the coal mining ruins at Cokedale. An exposure of the Cretaceous–Paleogene boundary (K–T boundary) is visible in the southern part of the park.
A portion of the mountain route of the Santa Fe Trail runs through the park.