In what ways does a stream transport its load?

There are three ways: Traction which is also known as Saltation, Suspension and Solution.

Traction:

Larger particles such as sand, gravel and boulders are moved by these processes where the Hydraulic force of the river is largely responsible as it either pushes the particles or applies drag on them as it flows over top of them.

Suspension:

Silt and clay are moved by this process. Turbulence within the water helps to keep the particles off the bed of the river.

Solution:

Weathering of rocks supplies the chemicals that make up the dissolved load. Chemicals are carried as individual ions in solution. When limestone is weathered calcium ions and carbonate ions are dissolved and will be part of the solution load which is transported by the flow of the river.