The Rio Grande River is still rising along the U.S.-Mexico border and forcing evacuations on both sides of the country.
"We just want to make sure we don't get caught by surprise," Roma Police Chief Jose Garcia said.
A tropical depression that came ashore Thursday added six to eight more inches to the rain-swollen river. It's now 50-feet deep in some places. The waters were already swollen from Hurricane Alex.
Two international bridges have also closed, and water levels are at their highest point in more than 35 years. Forecasters said a flash flood warning will stay in effect until Friday night.
Administrators at the Retama Manor nursing home were waiting on emergency officials to advise them of any risk posed by the rising waters. The facility sits next to one of the international bridges, just feet from the swift-moving water.
Nan Impink, a spokeswoman for the facility, said a plan is in place to move residents if there is a danger of flooding.
"For us that's an option of last choice because it's very disruptive to patients," she said.