Fairfield Lake State Park is a perfect microcosm of this. The lake exists primarily to provide water for a power plant. The state park exists on land leased at very low cost from the power company. The power company closed the plant, and the state could have bought the land to secure the state park. It already had all of the infrastructure you need to run a state park, and had staff lined up to do so. Instead they let the land pass into private ownership and made a halfhearted effort to recover the land after the fact.
A lot of Texans that I talk to assume that the vast public land of the Rockies and Sierras is a geographic inevitability. In reality much of this public land exists because of specific, concerted efforts by communities and municipalities.