Regional Offices > Green River Region > Green River Region News > Green River Region Annual Mule Deer Classifications

Green River Region Annual Mule Deer Classifications

December 15, 2018
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Herd classification data still being compiled, but tentative data gives managers some important clues.

Green River -

‚ÄčBaggs Wildlife Biologist Sam Stephens and Baggs Game Warden Kim Olson reported flying a total of 9 hours and counted an all-time high number of deer (closest was 6,567 in 2005). "Fawn ratio saw a slight increase, likely attributed to does experiencing a mild winter and entering parturition in better condition," Stephens said. "However, based on the abundance of deer and the marginal growing season we experienced, we suspect fawn mortality to be significant this winter. Buck ratios increased slightly, though much of the increase was due to a doubling of our yearling ratio. Adult bucks were down 25% from last year, further justification to reevaluate the antler point restriction, depending on how this winter affects fawn recruitment. 2018 Sample Size: 6,636 (2017 Sample: 6,413)

Adult Buck Ratio- 15:100 (20:100-2017)
Yearling Buck Ratio- 14:100 (7:100-2017)

Total Buck Ratio- 29:100 (28:100-2017) [2008-2017 average- 29:100]                                                       Fawn Ratio- 62:100 (60:100-2017) [2008-2017 average- 59:100]


     Mountain View Wildlife Biologist Jess Short, Mountain View Game Warden Allen Deru and Green River Information Education Specialist Lucy Wold conducted annual mule deer classifications in the Wyoming Range. Short said he and his colleagues flew 12 hours in the Green River Region. "Sample size was up substantially," Short said. "This was due to very good snow cover for the survey making deer easy to classify and grouped in a manner that allowed us to get more groups surveyed this year. Buck ratios were up slightly from last year but lower than we would like. This is due to very poor numbers of Class 1 bucks reducing the adult buck numbers. This is from the lack of those bucks born in 2016 that died as fawns in the winter of 2016/17.  We observed a good number of yearling does. This influences the ratios as yearling does do not have fawns."

2018 Sample Size: 5,607 (2017 Sample: 3,363)
Adult Buck Ratio- 17:100 (24:100-2017)
Yearling Buck Ratio- 11:100 (3:100-2017)
Total Buck Ratio-  28.27:100 (27.91:100-2017) [2008-2017 average- 34:100]
Fawn Ratio- 60:100 (61:100-2017) [2008-2017 average- 66:100]

- WGFD -



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