Did a search for Quikrete and rip-rap, and this was first on the list;
https://www.quikrete.com/productlines/riprap.asp .... by the pallet load could get discounted 30% ?
Typically, the dry bags get loaded into an old row boat and unloaded into the lake so they be staggered or interlocked like bricks in a brick wall ... have seen them used to dam up an outflow stream that raised the level of a Maine pond to where it wanted to be .... since 1973 .... staying in place for years and years .... like for 46-years in June and still holding, strong.
Is dark gray and blends good with granite boulders along the shore for natural harmony.