July 4 holiday plans could be affected for those planning to spend some time at Lake Travis, where few public boat ramps remain open because of low water levels.

The Lower Colorado River Authority in Austin says Lake Travis water levels now drop nearly 2 feet a week.

A Jonestown boat ramp site remains open.

LCRA spokeswoman Krista Umscheid-Ramirez said within the next week that boat ramp likely will be unusable as well.

News 8 Austin reports that would leave Mansfield Dam Park the only public launch point for the entire lake leading up to the July 4 holiday weekend.

The LCRA, on its Web site Wednesday, listed the lake level at about 25 feet below the historic June average.

The authority says extreme to exceptional drought conditions remain.