At my parents house that's on a public lake (that doesn't need the piers removed due to the ice) we used 2" galvanized pipe w/out cross braces. 8' pieces of pipe sunk between 4 and 5 feet into the bottom of the lake. We did use clamp on twisted figure 8's to connect the two pieces of pipe together, then set the 2x8 runners on them. The pier is 60' long and 4' wide "L" shaped. Hardly any wobble.

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3/4 to 1 1/4 ac pond LMB, SMB, PS, BG, RES, CC, YP, Bardello BG, (RBT & Blue Tilapia - seasonal).