70' - The river exceeds the levees - flooding is widespread, disastrous, and life threatening -
65' - The river is approaching the top of the levees - residents should be prepared to evacaute rapidly to several tens of miles from the lower Rio Grande channel as emergency officials direct - persons in the flood plain should monitor the latest stage and forecast levels of the river continuously.
58' - Major flooding covers the flood plain inside the levees-threatens lowest residences in Brownsville and Matamoros - persons vulnerable to lowland flooding should move equipment to higher ground and monitor the level of the river especially if heavy rain conditions develop.
56' - Moderate lowland flooding inside the levees reaches lowest secondary roads and low bridges
55' - Minor lowland flooding reaches into the lowest sections of the flood plain inside the levees with no significant damage
44' - The river will exceed the lowest banks of the lowest sections inside the levees