Are there any indoor/outdoor 400-meter tracks open to the public in Houston?

I'm looking to get back into mid-distance running ( I recently rediscovered my admiration for Steve Prefontaine) and I'm looking for an indoor/outdoor 400-meter track that is open to the public. I am located near the medical center in downtown Houston. Previously, I had heard Lamar High School and Rice University had outdoor tracks that are open to the public. Can anyone confirm if these are still available to the public? Any other recommendations? I'm looking for a track as opposed to running trails