Apx. 4″ long. Fuzzy and hiding under my deck.
The photo looks like a Fishing Spider from the genus Dolomedes.
These spiders are can walk on water and then dive below the surface where they can sometimes even catch small fish, hence the common name. Tho large, they are not dangerous to humans.
They are big spiders.
That said, they can bite. Fishing spiders’ propensity to bite varies with species and other factors. In some cases, an individual may strike at a person in order to defend itself if it feels threatened, or it may bite in defense of its egg sac. However, the normal encounters that put people and fishing spiders close together, they want out as much as you want them out. They should not be considered ‘aggressive.’
If they should bite it is not poisonous or serious(unless you have a really rare allergic reaction), but it can hurt.