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 5-4 Estimated Average Annual Irrigation Water Requirement (IWR)
River Basin Total IWR Active
Irrigated
Lands		 Unit IWR Total IWR Unit IWR
Wet Normal Dry Wet Normal Dry
ac-ft acres ac-ft/ac ac-ft ac-ft/ac
 Bear1   97,000   64,000   1.52                   
 Green   553,000   331,000   1.67   465,000   553,000   576,000   1.41   1.67   1.74 
 Northeast   103,000   77,000   1.33   95,000   103,000   126,000   1.23   1.34   1.64 
 Platte2   658,000   612,000   1.08                   
 Powder/Tongue   238,000   161,000   1.47   217,000   238,000   289,000   1.35   1.48   1.8 
 Snake/Salt   126,000   99,000   1.27   122,000   126,000   132,000   1.23   1.27   1.33 
 Wind/Bighorn1   1,165,000   600,000   1.94                   
 Total  2,940,000   1,944,000   1.473            
  1. Bear and Wind/Bighorn River Basin Plans did not calculate normal, dry, and wet year scenarios but overall averages.
  2. Platte methodology does not afford calculation of irrigation water requirement; values estimated by applying average CU:IWR ratio from other basins.
  3. Average unit IWR.