 We just can't confirm that scientifically at this time. Now, unrelated to the E. coli outbreak, the upper section of the North Anna branch of Lake Anna in Louisa County remains under a swimming advisory due to a harmful bacteria bloom. Mike Murillo, WTOP News. The Fourth of July is only about a day away now and folks are anxious to get out of town. AAA anticipates this week will be the busiest July 4th week ever. They expect more than 60 million people to hit the road this week with nearly 2 million from our area.