one way we do it is get you 4 4x4 post drive 2 on each side about 3 inches apart so you can slide some 2x12's in between. you want your 4x4's at least 4 foot in the mud. so for you 4x4x12's should be plenty. cut the 2x12's a lil longer so the edges get in the bank good so the water doesnt go around. after you put the 2x12s in nail a piece of 2x4 or something on top so the boards wont float up or have cracks. id get treated but ive also used untreated just depends how long it takes it to silt up. get a post hole driver big enough to drive 4x4s. a lil work to it but it works its either making a dam like this or filling with dirt boat load by boat load.
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