What model/year is this bike?
(I've never owned a cannondale bike) judging from the parts :


a triple crankset
bar end shifters
cantilever brakes
the rims seem wider than typical road bike rims.
a long cage dérailleur to accommodate big cassette (Not sure since the pic isn't the drive side)


It's likely a touring bike, so it's probably a modified Cannondale SR300, or Touring 1