Grass Spider or Hobo?
My wife spotted this unfriendly looking spider today outside our home in lower Michigan and as far as I can tell, it is a common grass spider. I think it is a bit large, though. It is about 2" in length and moves extremely fast down its funnel web, which is 7"-8" deep (maybe more).
Battle Creek, MI
Agelena naevia females are the largest members of the genus and adult females can have a body length of 1 inch and legs that span two inches easily. They act exactly as you describe. They are Grass Spiders or Funnel Web Spiders.