Some comments found on “the www”.
http://en.wikipedia.org/wiki/Eastern_mole - Eastern moles are good swimmers and not limited by rivers, but heavy clay soils associated with some waterways may limit dispersal.[4]
http://www.britishmolecatchers.co.uk/aboutmoles.htm - The mole builds its nest above the water level to ensure the nest is kept dry?. Moles are excellent swimmers and in times of flood will swim to higher ground. This also accounts for people who live next to streams and rivers been constantly plagued by moles.
http://icwdm.org/handbook/mammals/moles.asp The moles have only a few natural enemies because of their secluded life underground. Coyotes, dogs, badgers, and skunks dig out a few of them, and occasionally a cat, hawk, or owl surprises one above ground. Spring floods are probably the greatest danger facing adult moles and their young.
http://dartmoorpestcontrol.co.uk/moles_11.html Moles are excellent swimmers and in times of flood will swim to higher ground.
http://wdfw.wa.gov/living/moles.html- Spring floods kill many moles, especially young ones; humans also kill many moles.
http://wildlifecontrolsupplies.blogspot.com/2012/04/mole-faqs.html Can moles swim? All moles can swim it’the need arises. They have been observed to swim up to an hour and to cover a distance of over a half mile. The star-nosed mole is semi-acquatic and often obtains its food underwater. Members of this species are usually found in low- lying areas near water. In fact, their tunnels may exit into ponds or streams.
http://www.youtube.com/watch?v=yDCJf-dareI