Sheldon Lake State Park & Environmental Learning Center is a 2,800-acre outdoor education and recreation facility located in northeast Harris County. It is the only park in the state park system that is fee to enter. The park is split into two units: Sheldon Lake, which you can access from Pineland Road, and the State Park, which you can access from Garrett Road. The reservoir levees encompass 1,200 acres, of which 800 are permanently inundated and 400 are marsh and swampland. Most of the structures facilities use eco-smart technology such as wind power, solar power and water power. They were built from reclaimed materials from the area. Formerly in a rural area, Sheldon Lake has survived a tremendous influx of urbanization over the past 50 years as Houston has grown. Sheldon Lake is now a green and blue oasis for wildlife and people on the edge of Texas’ largest city.