66' - The Rio Grande river reaches lowest areas of Rio Grande City itself - widespread disastrous flooding inundates most of the roads and highways in and out of town - hundreds of homes are flooded<br><br>63.5' - Widespread flooding reaches much of the flood plain south of town and floods Highway 83 west of Rio Grande City - the Rio Grande river backs up the Arroyo Los Olmos and floods Highway 755 and threatens lowest homes in the Los Olmos flood plain<br><br>53' - Major lowland flooding damages irrigation pumps, equipment, roads and threatens livestock - bridges in the flood plain are severely flooded and become dangerous - the river backs up on the Arroyo Los Olmos and floods the lowest homes near Highway 83 and FM 755 as well as floods these roads.<br><br>50' - Irrigation pumps, equipment, livestock, roads and bridges flood in low areas<br><br>48' - Minor lowland flooding damages irrigation pumps and equipment if they are not moved<br><br>