The Jefferson County Department of Environmental Services is advising the public about a force main break a few hundred feet from the Cahaba Rive rnear Hwy. 31 in Riverchase. According to Environmental Services Director David Denard a contractor was inspecting the force main and inadvertently damaged it.The County is putting up signs in the area asking people to avoid the area and fishing or swimming in the Cahaba River from US Hwy. 31 to AL Hwy 52 for the time being.