SAN ANGELO, Texas — Heavy rains in the Mertzon area started swelling Spring Creek in the early hours of May 8, 2019. The runoff, pouring over several dams, closing low water crossings, sweeping debris and silt with the flow, is making its way into the Twin Buttes Reservoir.
As of 7:00 a.m. May 9, 2019, the runoff has raised the level of Twin Buttes by .84’ (10 3/32”) adding 5,715 acre feet to the basin (1.4 billion gallons) in 24 hours making the reservoir 71.94% full, the most water it has impounded in decades. As of this writing the Spring Creek runoff is slightly waning in volume, but rains forecast for the next few days could see it pick back up again as well as cause the other input streams into the Twin Buttes system to increase in volume.
The O.H. Ivie Reservoir also saw significant gains from recent runoffs. As of 7:00 a.m. May 9, 2019, the reservoir impounds 331,400 acre feet (107.9 billion gallons) of water bringing it to 59.78% full. The mighty reservoir now holds more than Twin Buttes and E.V. Spence combined. Runoff has continued for months unabated into Ivie from multiple sources. Its drainage area covers 12,647 square miles of West Texas.
The E.V. Spence Reservoir near Robert Lee saw a jump of 800 extra acre feet (260.6 million gallons), a rise in elevation of .11’ (1 5/16”) in the last 24 hours, bring it to a total of 141,800 acre feet (46.2 billion gallons, 27.4% full) impounded at the current time.
O.C. Fisher can’t catch a break. Almost no new water registered for the North Concho watershed, the reservoir remains just under 12% full.
The Oak Creek Reservoir near Blackwell jumped with the recent rains to over-top its spillway by .91’, bring it to 106% full. The spillway has continuously over-topped at various levels since September of 2018. The water from Oak Creek finds its way into O.H. Ivie.
Pecan Creek, the only natural inflow of water into Lake Nasworthy, rose a few feet for a short period of time helping bring Lake Nasworthy up a nudge to 8,846 acre feet (2.8 billion gallons) making it weigh in at 92% full.
More rains are in the forecast starting Friday and through the weekend for the Concho Valley. With the soils still being deeply saturated from the heavy late 2018 rains, any rainfall has a good chance of creating significant runoff into the reservoirs.