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Several Central Texas lakes are full. What does that mean for drought and water safety?

Mansfield Dam opens up for the first time since 2019 in Austin on July 18, following heavy rains that filled Lake Travis.
Lorianne Willett
/
KUT News
Mansfield Dam opens up for the first time since 2019 in Austin on July 18, following heavy rains that filled Lake Travis.

Large swaths of Texas are in recovery mode after last week鈥檚 flash flooding. Residents and businesses are for the second July in a row.

The heavy downpour in the region has also filled area lakes. Lake Travis and Lake Buchanan, which serve as the region鈥檚 primary reservoirs, and authorities opened the flood gates to release the water.

As Texas copes with changing water needs and a growing population, what does all this rain mean now and in the long-term?

Clara Tuma, a spokesperson for the Lower Colorado River Authority, said together the two lakes are 102% full for the first time since 2019.

鈥淲e do have 鈥 at Mansfield Dam, which creates Lake Travis, and at Tom Miller Dam, which creates Lake Austin,鈥 she said. 鈥淲e have had floodgate operations at other dams over the last few days, but as the water has been passed downstream, we鈥檝e been able to close those floodgates.鈥

With the reservoirs full, Tuma said the area is currently no longer in drought conditions.

鈥淭o all the newcomers who are just seeing this for the first time, I would say welcome to life in Flash Flood Alley,鈥 she said. 鈥淭his is how it works. We鈥檙e in a semi-arid region and we are prone to prolonged droughts like we just saw and then sudden flash flooding.鈥

 Whether lake levels stay high depends on a number of factors, including the forecast.

鈥淚t depends on weather. Is it hot and dry? No wind? How much is evaporation going to be a factor? How much water are people using?鈥 Tuma said. 鈥淎nd one of the things I鈥檇 like to share right now is that just because the lakes are full doesn鈥檛 mean, okay, everybody can waste water鈥 We should have that as a way of life, using water wisely. Nobody should ever say, 鈥榳ell, when we鈥檙e in drought, we鈥檒l conserve, but when they鈥檙e full, we鈥檒l just water our yards every day.鈥欌

Tuma also cautioned people to use extra care on local waterways in the coming days, since floods can wash debris into lakes and rivers.

鈥淲e are seeing some flood debris in the water,鈥 she said. 鈥淚f you鈥檙e out on a boat, beware, keep an eye out and understand that flood debris can be at the surface of the water or it can be under the surface of the water.鈥

There is also a risk of bacteria in the water after floods, which people should consider before swimming.

鈥淭he Highland Lakes are natural water bodies. They are not chlorinated swimming pools. There鈥檚 always a chance of encountering bacteria, but that chance goes up significantly after heavy rains, because bacteria tend to grow after flooding rains,鈥 Tuma said. 鈥淪tay away from any water that鈥檚 muddy or smelly or oily or murky. And if it looks like it鈥檚 been disturbed, if there鈥檚 dirt in the water, stay away. Go somewhere else. Use your best judgment. Also wear a life jacket. The lakes are deep, currents are strong. Life jackets save lives.鈥

Tuma said she expects Lake Travis specifically to start to fall again in the coming weeks 鈥 it is currently 105% full and should be down to 100% in the next few days.

鈥淲e鈥檙e going into what is traditionally one of the hottest times of the year. If we have many 100-degree days in a row, evaporation will increase, (water) use will increase,鈥 she said. 鈥淲e would expect to see water levels decline. But we鈥檒l see. We didn鈥檛 expect this big flood in July. We do have a super El Ni帽o in our area. We鈥檝e got . So stay tuned.鈥

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