Going into yesterday morning (June 8), we received some very heavy rainfall on top of an already
swollen river upstream of Possum Kingdom Lake. We were receiving 18,000-19,000 cubic feet per second
of inflows prior to the rain event, and we had two gates open. Our operational full level at Possum
Kingdom is elevation 999. The top of the gates is elevation 1,000. Our emergency spillway is
We were hopeful we could maintain a two-gate release and not have to open a third gate which increases
the release rate to around 27,000 cfs, and we know that impacts portions of Parker County. But inflows
continued to rise, including about 1.8 inches to 3 inches of rain right on top of the reservoir. The
lake level continued to rise to above 999.50, and if we would not have opened a third gate, the lake
level would have risen further and would have overtopped the gates and presented a dam safety issue.
That’s why we had to make the tough decision to open gates at Possum Kingdom Lake and particularly
that third gate. We don’t take (these gate openings) lightly. We look at streamflow. We look at the
rainfall amounts. We coordinate very closely with the West Gulf River Forecast Center that issues
We don’t make decisions on forecasts. We make decisions on lake level rises and the calculated inflows
into the reservoirs. We’re taking a change in reservoir storage over time and calculating inflows, and
if those inflows rise above 30,000 cfs to 35,000 cfs, that triggers that need for that third gate.