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Northern California Open Water Swimming Association Professional unbiased nonprofit open water swimming ratification Main Content Northern California Open Water Swimming without boundaries. Northern California Open Water Clarity of Purpose Marathon Swims SAN FRANCISCO BAYMARATHON SWIMS Unlike any other marathon swim venues our three marathon courses and numerousd day swims provide advanced swimmers some rather unique challenges Current tide weather visibility vessel traffic and water temperature must all be carefully considered to be successful in any of our three stunning marathon swims. Youve been warned. LAKE TAHOEMARATHON SWIMS Completing one of Tahoes marathon swims is quite an accomplishment.