2023: Jan Feb Mar Apr May Jun


2022: Jan Feb Mar Apr May Jun


2021: Jan Feb Mar Apr May Jun


2020: Jan Feb Mar Apr May Jun


2019: Jan Feb Mar Apr May Jun


2018: Jan Feb Mar Apr May Jun


2017: Jan Feb Mar Apr May Jun


2016: Jan Feb Mar Apr May Jun


2015: Jan Feb Mar Apr May Jun


2014: Jan Feb Mar Apr May Jun


2013: Jan Feb Mar Apr May Jun


2012: Jan Feb Mar Apr May Jun


2011: Jan Feb Mar Apr May Jun


2010: Jan Feb Mar Apr May Jun


2009: Jan Feb Mar Apr May Jun


2008: Jan Feb Mar Apr May Jun

Eastern Great Basin
2007: Jan Feb Mar Apr May Jun
2006: Jan Feb Mar Apr May Jun
2005: Jan Feb Mar Apr May Jun
2004: Jan Feb Mar Apr May Jun
2003: Jan Feb Mar Apr May Jun
2002: Jan Feb Mar Apr May Jun
2001: Jan Feb Mar Apr May Jun
2000: Jan Feb Mar Apr May Jun
1999: Jan Feb Mar Apr May Jun
1998: Jan Feb Mar Apr May Jun
1997: Jan Feb Mar Apr May Jun
1996: Jan Feb Mar Apr May Jun

Lower Colorado Basin
2007: Jan Feb Mar Apr May Jun
2006: Jan Feb Mar Apr May Jun
2005: Jan Feb Mar Apr May Jun
2004: Jan Feb Mar Apr May Jun
2003: Jan Feb Mar Apr May Jun
2002: Jan Feb Mar Apr May Jun
2001: Jan Feb Mar Apr May Jun
2000: Jan Feb Mar Apr May Jun
1999: Jan Feb Mar Apr May Jun
1998: Jan Feb Mar Apr May Jun
1997: Jan Feb Mar Apr May Jun
1996: Jan Feb Mar Apr May Jun

Upper Colorado Basin
2007: Jan Feb Mar Apr May Jun
2006: Jan Feb Mar Apr May Jun
2005: Jan Feb Mar Apr May Jun
2004: Jan Feb Mar Apr May Jun
2003: Jan Feb Mar Apr May Jun
2002: Jan Feb Mar Apr May Jun
2001: Jan Feb Mar Apr May Jun
2000: Jan Feb Mar Apr May Jun
1999: Jan Feb Mar Apr May Jun
1998: Jan Feb Mar Apr May Jun
1997: Jan Feb Mar Apr May Jun
1996: Jan Feb Mar Apr May Jun