Wyoming State Water Plan, Wyoming Water Development Office
Rafting on Snake River Lake Marie, Snowy Mountains Wyoming Wind River Range picture

STATEWIDE FRAMEWORK PLAN: Updated Data Tables
2007: Data Table

Estimated Average Annual Irrigation Surface Water Diversions from Most Recent Update
River Basin Historical Diversions Theoretical Diversions
Wet Normal Dry Overall
Average1		 Surface
Irrigated		 Overall Unit
Average		 Maximum
Diversions		 Maximum
Diversions
ac-ft acres ac-ft/ac ac-ft ac-ft/ac
 Bear (2011)2            286,366   64,000   4.48   310,861   4.86 
 Green (2010)2,3   421,639   396,246   370,852       334,500   1.18   421,639   1.26 
 Northeast Wyoming (2003)5   153,000   152,000   152,000   152,000   64,000   2.38   258,000   4.03 
 Platte (2006)4            1,553,000   612,000   2.54   1,860,000   3.04 
 Powder/Tongue (2002)5   397,000   349,000   388,000   349,000   161,000   2.17   594,000   3.69 
 Snake/Salt (2014)2   --   --   --   261,033   99,029   2.64   293,549   2.96 
 Wind/Bighorn (2010)5   3,079,200   2,944,200   2,756,400   2,926,600   634,300   4.61   3,149,300   4.97 
 Total (2007)        6,889,000   1,930,000   3.57   8,135,000   4.215 

Values in RED indicate basins updated since previous statewide plan.
  1. Overall average in the long-term average for the period of record, and is not the average of the Wet, Normal, and Dry columns.
  2. The Bear, Green, Platte, and Snake/Salt River Basin Plans did not provide normal, dry, and wet year scenarios for diversions.
  3. Green River Basin diversion data were not developed due to lack of data; data here are estimated by dividing the annual consumptive use (depletion) of irrigation water by the estimated overall irrigation efficiency.
  4. Platte River Basin diversions and irrigated acres represent total values, as basin plan did not distinguish between surface water and groundwater.
  5. Only Northeast, Powder/Tongue and Wind/Bighorn River Basin Plans calculated theoretical maximum diversions.