Just to follow up on my comments from other thread and my trip SAT I would count on nothing, at least as far as Mt Davis Spur. Anything you find will be generally standing water and in small quantities. I think I marked the clear, "flowing" points I found along the way. If you want I can post the GPS data or message you. But I wouldn't count on it as anything other than a desperation source, especially with how warm and dry the weather looks like it will be this week.