This document describes the modification of three total maximum daily loads (TMDLs): the Middle Snake River Watershed Management Plan (or Mid-Snake TMDL), the Upper Snake Rock Watershed Management Plan (or Upper Snake Rock TMDL), and the Billingsley Creek TMDL. This modification is due to the final development of the aquaculture wasteload allocation for 81 fish hatcheries (Part 1, inclusive of conservation hatcheries), 4 fish processors (Part 2), and 12 Billingsley Creek fish farms (Part 3) and the effect that these wasteload allocations will have on their associated receiving tributaries and the Middle Snake River and their beneficial uses and water quality standards. Setting seasonal wasteload allocations is also being proposed for some of the fish hatcheries. This document describes Part 2 in the modification of two total maximum daily loads (TMDLs) the Mid-Snake TMDL and the Upper Snake Rock TMDL. Part 2 involves the fish processors, which comprises only four (4) facilities or operations that discharge. They are Rainbow Trout/Filer Fish Processor (GAP-028) and SeaPac of Idaho Fish Processor (GAP-046), which both discharge into the Cedar Draw drainage and are therefore a part of the Cedar Draw TMDL. It also includes the Clear Springs Fish Processor (GAP-125) and the Clear Lakes Trout Fish Processor (GAP-011), which both discharge into the Clear Lakes drainage and are therefore a part of the Clear Lakes TMDL. Both TMDLs are compartmentalized under Segment 3 of the Middle Snake River, which is the receiving stream segment along with Cedar Draw and Clear Lakes. Finally, this comment document describes Part 3 in the modification of three total maximum daily loads (TMDLs) the Mid-Snake TMDL, the Upper Snake Rock TMDL, and the Billingsley Creek Watershed Management Plan (or Billingsley Creek TMDL).