I google "invasive vine with purple flower" and was able to identify it as Solanum dulcamara, which goes by several common names, most with the word "nightshade" in them.
Wikipedia entry, though the text is short. For more information than you probably want, check the USDA Forestry database.
The plant is not native. It has small berries that are mildly poisonous to humans but not to some birds, which eat the fruit and spread the seeds. It is a perennial, so it keeps coming back year after year. It does have some benefit to wildlife, including birds and bees and some mammals. It is in the same family as the tomato and potato, and it can host bacteria which cause rot in potatoes.
I hope to be nightshade free in a year or two.
The river has risen enough to close the cemetery roads. Below is the road over the creek.
river gauge says that the river has peaked and is now starting to recede. We reached moderate flood level and needed six or seven more inches to get to major flooding. We will not set a record for daily stream flow--there was a bigger flood on this date in 1958.