Linked from
The 8 pages that link to Suspended load, each with the reason it gives.
Grain sizeRelated: Fine grains can remain suspended where coarser particles settle.
Sediment depositionRelated: When turbulence weakens, suspended particles settle onto the bed.
SiltRelated: Silt commonly travels within flowing water as suspended load.
Tanana RiverRelated: Glacial flour gives the Tanana much of its characteristic silty appearance.
Stream bedRelated: It settles onto the bed when flow slows or water loses transport capacity.