I found a new Sprint tower last night in the Southbridge area of Shakopee. I was using an app called CDMA Field Testing Application and followed it to the following location.
44.77962,-93.443747
There is an enclosure and building there hooked to a couple of antenna's on top of the power line structure but I didn't have time to take any pictures.
This site is listed as a future tower build on the Sprint web site and apparently it's up and running with LTE.
http://coverage.sprint.com/action/WebImageStream10?covType=sprint&serviceType=voice&mapcenterx=-93.4977035522461&mapcentery=44.777313232421875&geocenterx=-93.4977&geocentery=44.7746&endlinex=&endliney=&scale=10.0&width=420&height=315&showPinpoint=T&signalStrength=T&antiAlias=T&layers=TFFTFTTTTFTFFTFFFFFFFTTFFFF
I've also been getting 4G from the tower behind the Shakopee Target store, mapped at 44.777224,-93.500088