Utah Senate Districts effective January 1, 2012 for nominating and electing members of the Utah Senate and on January 1, 2013 for all other purposes.
Method:
Boundaries were initially created using Census Block Assignment files.
Boundaries were moved around residences as per SB 3005 (2011 Third Special Session).
Changes were made as per SB 125 (2012 general session) wherein county clerks requested changes be made to political boundaries to align with local boundaries or to prevent small voting precincts. This bill also allowed political boundaries to be moved to accurately represent municipal boundaries.
More information at: http://gis.utah.gov/data/political/2012-2021-house-senate-congressional-districts