at the headwaters of south branch newport creek, the daily load of iron is . the concentration of iron at this location is 0.26 milligrams per liter. downstream of unt 28346, the daily iron load is per day and the concentration is 3.34 milligrams per liter. downstream of the sheatown discharge, the load of iron is per day (with a concentration of 4.62 milligrams per liter) and upstream of the mouth, the load is per day, where the concentration of iron is 1.11 milligrams per liter.