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
UPDATED: Data Table

Table 5-3 Estimated Average Annual Irrigation Surface Water Diversions
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
 Bear2            295,000   64,000   4.61   303,000   4.74 
 Green2,3            1,011,000   330,000   3.06   1,394,000   4.22 
 Northeast Wyoming5   153,000   152,000   152,000   152,000   64,000   2.38   258,000   4.03 
 Platte4            1,553,000   612,000   2.54   1,860,000   3.04 
 Powder/Tongue5   397,000   349,000   388,000   349,000   161,000   2.17   594,000   3.69 
 Snake/Salt2            363,000   99,000   3.67   448,000   4.52 
 Wind/Bighorn5   3,028,000   3,148,000   2,324,000   3,166,000   600,000   5.28   3,278,000   5.46 
 Total        6,889,000   1,930,000   3.57   8,135,000   4.215 

  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.