Table 1 - Montana County Weather Station IWR Data for Seasonal Alfalfa Evapotranspiration and Montana County Management Factor.
Column A | Column B | Column C | Column D | Column E | Column F | Column G | Column H |
County | Weather Station | Elevation | IWR Flood Irrigation, Wheeline & Handline Seasonal ET (inches) | IWR Center Pivot Irrigation Seasonal ET (inches) | Management Factor Percentage 1964 - 1973 (pre-July 1, 1973 HCU) | Management Factor Percentage 1973 - 2006 (post-July 1, 1973 HCU) | Management Factor Percentage 1997 - 2006 (proposed use) |
Beaverhead | Dillon | 5239 | 18.34 | 20.74 | 63.7% | 82.8% | 88.3% |
Wisdom | 6060 | 7.34 | 9.29 | ||||
Jackson | 6480 | 8.35 | 10.30 | ||||
Lakeview | 6710 | 8.39 | 10.67 | ||||
Lima | 6583 | 13.75 | 16.01 | ||||
Big Horn | Busby | 3430 | 20.32 | 22.88 | 55.4% | 78.7% | 88.1% |
Hardin | 2905 | 27.46 | 29.96 | ||||
Hysham 25 | 3100 | 20.25 | 22.86 | ||||
Wyola | 3750 | 19.19 | 21.89 | ||||
Yellowtail Dam | 3305 | 28.07 | 31.30 | ||||
Blaine | Chinook | 2420 | 20.80 | 23.57 | 58.7% | 63.6% | 66.0% |
Harlem | 2362 | 21.62 | 24.27 | ||||
Broadwater | Townsend | 3840 | 19.42 | 21.88 | 69.2% | 79.5% | 87.1% |
Trident | 4040 | 20.64 | 23.31 | ||||
Carbon | Joliet | 3776 | 22.41 | 25.12 | 58.3% | 66.8% | 70.8% |
Red Lodge | 5500 | 15.57 | 18.41 | ||||
Carter | Ekalaka | 3425 | 20.13 | 23.14 | 38.4% | 54.7% | 54.1% |
Ridgeway | 3320 | 20.28 | 23.01 | ||||
Cascade | Cascade 20 | 4600 | 14.12 | 16.63 | 57.3% | 70.0% | 78.8% |
Cascade 5 | 3360 | 17.90 | 20.75 | ||||
Great Falls | 3675 | 19.78 | 22.55 | ||||
Neihart | 4945 | 12.17 | 15.08 | ||||
Sun River | 3340 | 18.10 | 20.65 | ||||
Chouteau | Big Sandy | 2700 | 21.52 | 24.37 | 52.5% | 64.9% | 77.9% |
Fort Benton | 2640 | 21.98 | 24.75 | ||||
Geraldine | 3130 | 20.30 | 23.27 | ||||
Iliad | 2950 | 21.55 | 24.27 | ||||
Loma | 2700 | 22.64 | 25.37 | ||||
Shonkin | 4300 | 13.32 | 16.70 | ||||
Custer | Miles City | 2628 | 26.68 | 29.55 | 54.5% | 72.0% | 81.1% |
Mizpah | 2480 | 23.80 | 26.57 | ||||
Powderville | 2800 | 24.83 | 27.68 | ||||
Dawson | Glendive | 2076 | 26.01 | 28.99 | 56.8% | 63.6% | 72.0% |
Deer Lodge | No weather station | See appropriate adjacent county |
Column A | Column B | Column C | Column D | Column E | Column F | Column G | Column H |
County | Weather Station | Elevation | IWR Flood Irrigation, Wheeline & Handline Seasonal ET (inches) | IWR Center Pivot Irrigation Seasonal ET (inches) | Management Factor Percentage 1964 - 1973 (pre-July 1, 1973 HCU) | Management Factor Percentage 1973 - 2006 (post-July 1, 1973 HCU) | Management Factor Percentage 1997 - 2006 (proposed use) |
Fallon | Plevna | 2780 | 22.48 | 25.34 | 47.6% | 47.8% | 47.6% |
Fergus | Denton | 3620 | 15.39 | 18.12 | 48.8% | 65.8% | 68.3% |
Lewistown | 4167 | 15.54 | 18.44 | ||||
Roy | 3450 | 19.94 | 22.78 | ||||
Winifred | 3240 | 17.86 | 20.75 | ||||
Flathead | Creston | 2949 | 14.97 | 17.81 | 87.6% | 94.5% | 96.6% |
Hungry Horse Dam | 3160 | 14.66 | 18.06 | ||||
Kalispell | 2972 | 16.45 | 19.03 | ||||
Olney | 3165 | 12.50 | 15.16 | ||||
Polebridge | 3600 | 10.20 | 12.50 | ||||
West Glacier | 3154 | 13.74 | 16.78 | ||||
Whitefish | 3100 | 15.74 | 18.61 | ||||
Gallatin | Bozeman Exp Farm | 4775 | 16.84 | 19.55 | 73.5% | 92.1% | 98.6% |
Bozeman MT State | 4913 | 18.42 | 21.39 | ||||
Hebgen Dam | 6667 | 10.09 | 12.77 | ||||
Garfield | Cohagen | 2710 | 22.36 | 24.99 | 43.4% | 50.6% | 46.1% |
Jordan | 2661 | 23.58 | 26.32 | ||||
Mosby | 2750 | 24.51 | 27.34 | ||||
Glacier | Babb | 4300 | 12.12 | 14.87 | 59.7% | 73.6% | 73.9% |
Cut Bank | 3855 | 16.01 | 18.60 | ||||
Del Bonita | 4340 | 14.61 | 17.30 | ||||
East Glacier | 4810 | 10.60 | 13.26 | ||||
St Mary | 4560 | 13.64 | 16.60 | ||||
Golden Valley | Ryegate | 4440 | 17.60 | 20.17 | 62.6% | 65.5% | 64.6% |
Granite | Philipsburg Ranger Station | 5270 | 12.90 | 15.26 | 86.5% | 87.4% | 96.6% |
Hill | Fort Assinniboine | 2613 | 22.42 | 25.20 | 54.1% | 59.8% | 60.4% |
Guilford | 2820 | 19.54 | 22.06 | ||||
Havre | 2585 | 20.94 | 23.46 | ||||
Simpson | 2815 | 19.67 | 22.13 | ||||
Jefferson | Boulder | 4904 | 17.08 | 19.47 | 61.0% | 77.9% | 81.1% |
Judith Basin | Moccasin Exp Station | 4243 | 16.17 | 19.06 | 49.3% | 68.0% | 68.8% |
Raynesford | 4220 | 16.14 | 19.05 | ||||
Stanford | 4860 | 16.74 | 19.69 | ||||
Lake | Bigfork | 2910 | 17.37 | 20.61 | 55.0% | 69.2% | 68.7% |
Polson | 2949 | 20.46 | 23.23 | ||||
Polson Kerr Dam | 2730 | 21.37 | 24.08 |
Column A | Column B | Column C | Column D | Column E | Column F | Column G | Column H |
County | Weather Station | Elevation | IWR Flood Irrigation, Wheeline & Handline Seasonal ET (inches) | IWR Center Pivot Irrigation Seasonal ET (inches) | Management Factor Percentage 1964 - 1973 (pre-July 1, 1973 HCU) | Management Factor Percentage 1973 - 2006 (post-July 1, 1973 HCU) | Management Factor Percentage 1997 - 2006 (proposed use) |
St Ignatius | 2940 | 19.53 | 22.33 | ||||
Lewis & Clark | Augusta | 4070 | 17.51 | 20.13 | 60.1% | 79.0% | 79.7% |
Austin | 4790 | 15.41 | 17.96 | ||||
Helena | 3828 | 20.23 | 22.69 | ||||
Holter Dam | 3490 | 23.88 | 26.61 | ||||
Lincoln Ranger Station | 4575 | 12.87 | 15.22 | ||||
Liberty | Chester | 3132 | 19.28 | 21.74 | 54.8% | 65.7% | 63.9% |
Joplin | 3300 | 19.01 | 21.40 | ||||
Tiber Dam | 2850 | 22.98 | 25.46 | ||||
Lincoln | Eureka Ranger Station | 2532 | 20.63 | 23.26 | 47.1% | 56.3% | 58.8% |
Fortine | 3000 | 16.09 | 18.69 | ||||
Libby Ranger Station | 2096 | 21.20 | 23.71 | ||||
Libby | 3600 | 11.06 | 13.36 | ||||
Troy | 1950 | 19.90 | 22.68 | ||||
Madison | Alder | 5800 | 14.33 | 16.75 | 65.2% | 79.0% | 83.3% |
Ennis | 4953 | 17.19 | 19.71 | ||||
Glen | 5050 | 17.81 | 20.01 | ||||
Norris | 4750 | 20.88 | 23.97 | ||||
Twin Bridges | 4777 | 16.98 | 19.22 | ||||
Virginia City | 5770 | 15.57 | 18.13 | ||||
McCone | Brockway | 2630 | 20.74 | 23.35 | 43.7% | 55.0% | 60.6% |
Circle | 2480 | 22.23 | 25.01 | ||||
Fort Peck Power Plant | 2070 | 25.37 | 28.16 | ||||
Vida | 2400 | 21.74 | 24.65 | ||||
Meagher | Lennep | 5880 | 11.93 | 14.38 | 57.3% | 70.4% | 78.3% |
Martinsdale | 4800 | 15.19 | 17.73 | ||||
White Sulpher Spr | 5060 | 16.41 | 18.89 | ||||
Mineral | St Regis Ranger Stn | 2680 | 17.61 | 20.05 | 56.1% | 63.3% | 63.6% |
Superior | 2710 | 21.94 | 24.54 | ||||
Missoula | Lindbergh Lake | 4320 | 14.63 | 17.22 | 69.5% | 67.5% | 69.4% |
Missoula | 3420 | 18.85 | 21.49 | ||||
Missoula WSO AP | 3199 | 19.45 | 21.89 | ||||
Potomac | 3620 | 14.05 | 16.26 |
Column A | Column B | Column C | Column D | Column E | Column F | Column G | Column H |
County | Weather Station | Elevation | IWR Flood Irrigation, Wheeline & Handline Seasonal ET (inches) | IWR Center Pivot Irrigation Seasonal ET (inches) | Management Factor Percentage 1964 - 1973 (pre-July 1, 1973 HCU) | Management Factor Percentage 1973 - 2006 (post-July 1, 1973 HCU) | Management Factor Percentage 1997 - 2006 (proposed use) |
Seeley Lake Ranger Station | 4100 | 14.86 | 17.31 | ||||
Musselshell | Melstone | 2920 | 24.22 | 27.17 | 50.0% | 58.7% | 56.2% |
Roundup | 3386 | 23.98 | 26.79 | ||||
Park | Cooke City | 7460 | 8.68 | 11.63 | 56.9% | 66.1% | 67.5% |
Gardiner | 5275 | 22.46 | 24.70 | ||||
Livingston | 4870 | 16.59 | 19.41 | ||||
Livingston FAA AP | 4656 | 18.63 | 21.39 | ||||
Wilsall | 5840 | 13.20 | 16.01 | ||||
Petroleum | Flatwillow | 3133 | 22.27 | 25.01 | 44.0% | 50.0% | 43.2% |
Phillips | Content | 2340 | 21.15 | 23.97 | 54.7% | 54.7% | 54.9% |
Malta 35 | 2650 | 20.28 | 22.99 | ||||
Malta 7 | 2262 | 21.61 | 24.39 | ||||
Port of Morgan | 2830 | 20.15 | 22.72 | ||||
Saco | 2180 | 20.13 | 22.70 | ||||
Zortman | 4660 | 14.38 | 17.40 | ||||
Pondera | Conrad | 3550 | 16.93 | 19.42 | 71.4% | 81.0% | 83.7% |
Valier | 3810 | 18.31 | 20.96 | ||||
Powder River | Biddle | 3597 | 21.87 | 24.66 | 38.5% | 49.3% | 53.3% |
Broadus | 3032 | 23.03 | 25.69 | ||||
Moorhead | 3220 | 23.72 | 26.42 | ||||
Sonnette | 3900 | 18.32 | 20.96 | ||||
Powell | Deer Lodge | 4678 | 13.14 | 15.32 | 77.6% | 90.0% | 100.0%1 |
Ovando | 4109 | 12.28 | 14.43 | ||||
Prairie | Mildred | 2510 | 22.92 | 25.58 | 59.6% | 73.6% | 84.3% |
Terry | 2248 | 22.82 | 25.47 | ||||
Terry 21 | 3260 | 18.65 | 21.34 | ||||
Ravalli | Darby | 3880 | 18.91 | 21.44 | 79.5% | 88.6% | 96.1% |
Hamilton | 3529 | 19.93 | 22.34 | ||||
Stevensville | 3380 | 19.19 | 21.44 | ||||
Sula | 4475 | 12.09 | 14.42 | ||||
Western Ag Research | 3600 | 19.82 | 22.15 | ||||
Richland | Savage | 1990 | 23.61 | 26.59 | 56.0% | 72.9% | 88.4% |
Sidney | 1931 | 22.49 | 25.45 | ||||
Roosevelt | Bredette | 2638 | 19.99 | 22.86 | 46.5% | 64.9% | 74.6% |
Culbertson | 1942 | 20.84 | 23.73 | ||||
Wolf Point | 1985 | 24.16 | 27.03 |
Column A | Column B | Column C | Column D | Column E | Column F | Column G | Column H |
County | Weather Station | Elevation | IWR Flood Irrigation, Wheeline & Handline Seasonal ET (inches) | IWR Center Pivot Irrigation Seasonal ET (inches) | Management Factor Percentage 1964 - 1973 (pre-July 1, 1973 HCU) | Management Factor Percentage 1973 - 2006 (post-July 1, 1973 HCU) | Management Factor Percentage 1997 - 2006 (proposed use) |
Rosebud | Birney | 3160 | 24.57 | 27.29 | 47.7% | 67.7% | 72.7% |
Brandenberg | 2770 | 23.83 | 26.52 | ||||
Colstrip | 3218 | 23.32 | 26.10 | ||||
Forsythe | 2520 | 25.17 | 28.04 | ||||
Ingomar | 2780 | 23.18 | 25.83 | ||||
Rock Springs | 3020 | 21.35 | 23.93 | ||||
Sanders | Heron | 2240 | 14.82 | 17.73 | 58.8% | 69.1% | 62.8% |
Thompson Falls Power | 2380 | 22.49 | 25.36 | ||||
Trout Cr Ranger Station | 2356 | 16.60 | 19.40 | ||||
Sheridan | Medicine Lake | 1975 | 21.64 | 24.49 | 44.8% | 68.5% | 80.7% |
Plentywood | 2063 | 20.64 | 23.48 | ||||
Raymond Border Station | 2384 | 19.13 | 22.04 | ||||
Redstone | 2300 | 17.86 | 20.58 | ||||
Westby | 2120 | 18.10 | 21.033 | ||||
Silverbow | Butte FAA AP | 5545 | 14.73 | 17.06 | 68.8% | 90.3% | 93.6% |
Divide | 5350 | 15.25 | 17.58 | ||||
Stillwater | Columbus | 3602 | 22.31 | 25.09 | 46.5% | 62.9% | 72.5% |
Mystic Lake | 6544 | 13.57 | 16.57 | ||||
Nye | 4840 | 15.00 | 17.93 | ||||
Rapelje | 4125 | 20.35 | 23.07 | ||||
Sweet Grass | Big Timber | 4100 | 20.60 | 23.47 | 44.7% | 53.6% | 49.4% |
Melville | 5370 | 12.83 | 15.49 | ||||
Teton | Blackleaf | 4240 | 14.74 | 17.34 | 68.8% | 80.2% | 88.4% |
Choteau Airport | 3845 | 20.53 | 23.07 | ||||
Fairfield | 3980 | 19.10 | 21.76 | ||||
Gibson Dam | 4724 | 13.57 | 16.22 | ||||
Toole | Goldbutte | 3498 | 16.30 | 18.96 | 51.8% | 66.5% | 70.8% |
Sunburst | 3610 | 18.74 | 21.46 | ||||
Sweetgrass | 3466 | 18.22 | 21.22 | ||||
Treasure | Hysham | 2660 | 25.01 | 27.78 | 53.4% | 75.2% | 91.5% |
Valley | Glasgow WSO AP | 2293 | 23.48 | 26.12 | 57.9% | 66.6% | 74.9% |
Hinsdale | 2670 | 22.18 | 25.25 | ||||
Opheim 10 | 2878 | 16.19 | 18.86 | ||||
Opheim 16 | 3258 | 16.73 | 19.34 |
Column A | Column B | Column C | Column D | Column E | Column F | Column G | Column H |
County | Weather Station | Elevation | IWR Flood Irrigation, Wheeline & Handline Seasonal ET (inches) | IWR Center Pivot Irrigation Seasonal ET (inches) | Management Factor Percentage 1964 - 1973 (pre-July 1, 1973 HCU) | Management Factor Percentage 1973 - 2006 (post-July 1, 1973 HCU) | Management Factor Percentage 1997 - 2006 (proposed use) |
Wheatland | Harlowton | 4162 | 17.83 | 20.56 | 46.6% | 58.7% | 54.4% |
Judith Gap | 4573 | 13.77 | 16.40 | ||||
Wibaux | Carlyle | 3030 | 19.87 | 22.75 | See appropriate adjacent county | ||
Wibaux | 2696 | 18.69 | 21.50 | ||||
Yellowstone | Billings Water Plant | 3097 | 26.16 | 28.92 | 59.5% | 71.4% | 77.8% |
Billings WSO | 3648 | 25.49 | 28.22 | ||||
Huntley Exp Station | 3034 | 21.92 | 24.61 |
1The 1997-2006 county management factor was calculated to be slightly greater than 100%, therefore the 1997-2006 Management Factor is set to 100%.
Mont. Admin. r. 36.12.1902
85-2-112, 85-2-113, 85-2-302, MCA; IMP, 85-2-302, 85-2-401, 85-2-402, 85-2-407, 85-2-408, 85-2-436, MCA;