Iodine supplements usually aren't necessary if you live in the United States or in most developed countries. Some alternative medicine practitioners recommend iodine tablets or kelp supplements â which are high in iodine â for people with hypothyroidism.
The area within the entire watershed of the Rio Grande is some 336,000 square miles (870,000 square km). Because a large proportion of the riverâs basin is arid or semiarid, however, only about half of the total area, or about 176,000 square miles (456,000 square km), actually contributes to the riverâs flow.
The Colorado River Running from Coloradoâs Rocky Mountains to the Gulf of California, the Colorado River is 1,450 miles long. Within Grand Canyon National Park itself, the Colorado Riverâs 277 miles flow at an average speed of four miles per hour. The riverâs average width is 300 feet across, although it narrows to only 76 feet wide at mile 135, where the river, 85 feet deep, is also at its deepest. On average, the Colorado River within the Grand Canyon is 40 feet deep.