Texas is expected to see rain through Saturday as the Highland Lakes watershed experiences historic flooding. The floods have already claimed two lives and prompted Gov. Greg Abbott to declare a state of disaster for 18 counties in the state.

The Llano River rose to its second-highest recorded level on Tuesday, at about 30 feet above flood stage. Floodwaters reached the roofs of some homes in the Graveyard Point neighborhood. 

Dam releases on the lower Colorado River are helping to alleviate pressure, as Lake Travis topped 700 feet early Thursday morning for the first time since the July 2007 flood. The lake was expected to rise another 5 to 10 feet by Friday, which could trigger a record eight floodgates to be opened at Mansfield Dam, according to the Lower Colorado River Authority (LCRA). Another 5 to 10 feet could also flood hundreds of homes at Graveyard Point.

(MORE: 'Historic Flooding' Swamping Texas Highland Lakes)

"This is a historic flood," LCRA General Manager Phil Wilson said in a news briefing on Wednesday, according to Statesman, as he urged people in the area to take precautions.

Flood watches and warnings remain in effect for central and northern Texas on Thursday as more rain is forecasted. West-central to northern Texas could see an additional 1 to 3 inches through Saturday.