It is legal in most Canadian waters to sink a mooring just about where you wish, provided that it does not obstruct a buoyed channel, nor obstruct nor interfere with an established water thoroughfare. It is also illegal to construct a mooring of material that pollutes a water course with any chemical substance, or in any way that destroys fish habitat. It is illegal to use any piece of heavy equipment on the ground within 30 meters of any shoreline (without a permit), and to dredge or remove material from the bed of the watercourse, lake or basin.All that said, a sailor can put a mooring in, and enjoy the use of it quite legally and without paying mooring rent. No permit is required. The problem is, however that we have lots of ice in most Canadian waters, and ice can easily lift and move moorings, especially if the mooring is located in an area where strong currents occur. Most moorings are therefore set in sheltered bays and inlets, safe from ice movement and sheltered from currents and prevailing wind and wave action. Many are lost over winter.So Ok, I have found a sweet little sheltered spot on the lee side of an unihabited island, at a place where there is an ephemeral stream outlet which creates a scour that makes natural harbour basin about 200 feet in diameter, with an average basin depth of water of twelve feet. There is no flow from this stream except during the spring runoff, well before sailing weather is available. The bottom in this place is very deep-laying fine sand. It is in a small cove, closely sheltered on three sides by high land and big trees. The unsheltered side is only about 200 feet across a river from the shelter of the mainland shore and it faces away from the prevailing wind. It is an ideal spot, being only 800 feet upstream of a nice Marina where a dock, gas, groceries, ice, boat launch and refreshments are available. It is also reasonably close to my home and near good cruising waters. Naturally,I intend to get my mooring in quite early, before the end of April, it being a first come, first served sorta thing. I have seen moorings there a few years ago.The question is, how much weight (in cast concrete pigs) would be enough to hold a 23-foot O'Day sailboat, moored in such a sheltered area. (In a non-tidal fresh water river). It must be borne in mind that the mooring anchor must be placed from a boat without mechanical hoising equipment, so that a man in a boat can lift the mooring weights by hand to place them (and it cannot be an engine block, etc).I am thinking of making up several (three or four) 120-lb concrete castings with fairly large 5" diameter steel eyes affixed to each one, so that each one can be strung together, one by one, by sliding each one, one at a time, down a 20' chain, from a 16' aluminum boat. The 3/8' galvanized chain, with a swivel, will be then be buoyed and secured to a steel float (voided propane cylinder) tightly surrounded by an inflated automobile tire with tube, as a hull fender. The 20-foot long chain will then be secured to the float with a locked shackle, as will the boat, when moored. The float will bear the hail name of the boat to identify the mooring as private and for my own boat's use.I am thinking that 300 to 400 lbs of concrete mooring pigs, strung together in a line on one chain should be sufficient to hold the 23' boat securely in such a sheltered place, since there is little wave action, current or wind in the area and no water level fluctuation during the summer. Since the concrete can be lowered piece by piece, such individual weights are manageable, but they are too heavy to be easily lifted together, or to be easily moved away from that place by towing. Comes winter, however, the whole mooring, chain and all, well may disappear with the ice, so I do not wish to go to a lot of expense to make the mooring totally bulletproof. What I may do for winter is unshackle the buoy and lead the end of the chain ashore on a stout submerged rope and then tie it to a tree until spring returns.Are there any opinions about the amount of weight, or the tackle, I have suggested?Is it enough?? I have no clue about that, so welcome your views.