The former western terminus of Highway 51 is at Highway 656, 10.5 kilometres (6.5 mi) north of Springwater, where it met the former alignment of Highway 14.[2] When Highway 14 was realigned between Biggar and Landis, a portion of the bypassed section was renumbered and became part of Highway 51.
In 1999, the thin membrane surface section of Highway 51 east of Kerrobert was tested with a Cold in-place recycling or "CIR" method to rehabilitate highways. This CIR process is a cost-effective method which recycles the top surface of a road. This pulverized material is mixed with asphalt emulsion and spread and compacted back onto the highway surface. This surface is then recovered with a new seal dependent on traffic volume.[3]
^The H.M. Gousha Company (1956). "Shell Map of British Columbia, Alberta, Saskatchewan, and Manitoba" (Map). Manitoba–Saskatchewan. The Shell Oil Company. § D-2.
^Gerbrandt, Ron (2000). "Guidelines must be followed strictly - No exceptions"(PDF). Effect of Cold-in-place recycling on the Heavyweight Trucking Industry. Tim Makahoniuk, Cathy Lynn Borbely, Curtis Berthelot. 6th International Conference on Heavy Vehicle Weights and Dimension Proceedings. Retrieved 25 January 2009.
^MapArt (2007). Saskatchewan Road Atlas (Map) (2007 ed.). 1:540,000. Oshawa, ON: Peter Heiler Ltd. pp. 30–31. ISBN1-55368-020-0.