Ranch and resource manager Bernard Petersen, left, and director of resources for the Southern Nevada Water Authority Zane Marshall look at Swallow Spring the storm rolling in at Great Basin Ranch …

Ranch and resource manager Bernard Petersen, left, and director of resources for the Southern Nevada Water Authority Zane Marshall look at Swallow Spring the storm rolling in at Great Basin Ranch in Spring Valley, Monday, Aug. 7, 2017. Elizabeth Brumley Las Vegas Review-Journal Swallow spring