Different types of River Load

Solution - Disolvable substances carried along in the water E.g. Limestone

Suspension - Fine Material(Silt/Clay) whipped by turbulence carried along in water. Most eroded material is transported this way

Saltation - Larger particles(Pebbles/gravel) to heavy for Suspension. Water force causes them to bounce along river bed

Traction - Very large particles (boulders) pushed along river bed by water force.                   

 Material Transported by Traction or Saltation is called the River's Bedload