INGRAM, Texas — Search and rescue crews from Mexico were forced to halt their operations on the Guadalupe River in Ingram, Texas today as rain caused water levels to rise, complicating efforts to find victims of the deadly July 4th floods.

A large percentage of people still unaccounted for were probably visiting the area, Kerr County Judge Rob Kelly said.

With more than 170 still missing, communities must reconcile how to pick up the pieces around a waterway that remains both a wellspring and a looming menace.

Eight-year-old girls at sleep-away camp, families crammed into recreational vehicles, local residents traveling to or from work. These are some of the victims.

Plans to develop a flood monitoring system in the Texas county hit hardest by deadly floods were scheduled to begin only a few weeks later.

Betty Matteson’s four children, nine grandchildren and numerous great-grandchildren have squeezed into her Texas Hill Country home countless times since 1968.

The conditions are life threatening and could flood creeks, streams, streets, highways, underpasses and "urban areas," according to the NWS.

Here's what to know about the deadly flooding, the colossal weather system that drove it and ongoing efforts to identify victims.