Snow Loads for Structural Design in Montana (Revised 2004)

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Station 50 Year (MRI) Depth Low Extreme Snow Load Log - Pearson Type III Calculated Snow Load High Extreme Snow Load 50 Year (MRI) Depth Low Extreme Snow Load Lognornal Calculated Snow Load High Extreme Snow Load (inches) (psf) (psf) (psf) (inches) (psf) (psf) (psf) Belgrade Airport 23.3 - 18.3 33.3 - 52.6 24.0 - 19.5 34.6 - 53.8 Bozeman 12 NE 57.6 - 36.5 95.7 - 164.4 59.3 - 40.0 99.3 - 168.0 Bozeman 6 W Exp. Farm 21.1 - 14.7 29.8 - 49.0 21.9 - 16.0 31.1 - 50.3 Bozeman MSU 28.6 - 27.2 42.3 - 61.6 27.6 - 25.4 40.5 - 59.8 Dillon AP 14.2 - 0.0 19.2 - 87.8 16.1 - 0.0 21.9 - 90.5 Dillon WMCE 17.8 (22.3) 0.0 24.4 (31.4) 93.0 17.9 (21.4) 0.0 24.5 (29.9) 93.1 Divide 14.4 - 0.0 19.3 - 88.0 15.3 - 0.0 20.7 - 89.3 Grant 5 SE 17.8 - 0.0 24.4 - 93.1 17.9 - 0.0 24.6 - 93.3 Hebgen Dam 76.3 - 77.8 137.1 - 205.7 72.7 - 69.5 128.8 - 197.4 Jackson 30.7 - 0.0 45.1 - 113.7 37.4 - 0.0 56.7 - 125.4 Lakeview 103.6 - 147.5 206.8 - 275.4 119.3 - 192.7 252.0 - 320.6 Lima 19.3 - 0.0 26.7 - 95.4 18.5 - 0.0 25.5 - 94.1 Manhattan 15.2 - 5.7 20.7 - 40.0 21.3 - 15.0 30.1 - 49.4 Norris Madison PH 24.3 - 19.9 34.9 - 54.2 23.3 - 18.3 33.4 - 52.6 Pony 30.3 - 0.0 44.3 - 113.0 33.4 - 0.0 49.6 - 118.2 West Yellowstone 75.3 - 75.7 135.0 - 203.6 82.1 - 91.9 151.2 - 219.8 Wise River 3 WNW 18.5 - 0.0 25.5 - 94.2 19.7 - 0.0 27.4 - 96.0 81
Station County Table A.4: Snow load data for NWS stations in Region 4 Latitude Longitude Elevation ' " ' " (ft) Max. Recorded Depth Calculated Snow Load Augusta Lewis & Clark 47 29 35 112 23 47 4070 10 - 20 - 40.8 - Austin 1 W Lewis & Clark 46 38 20 112 15 31 4790 12 13 19 35 38.4 (67.0) Barber Golden Valley 46 18 39 109 22 19 3730 11 - 26 - 45.4 - Big Sandy Chouteau 48 8 6 110 3 39 2770 27 28 17 25 20.8 (27.8) Blackleaf Teton 48 0 46 112 26 13 4235 18 19 22 36 31.8 (53.3) Brady Aznoe Chouteau 47 57 0 111 20 0 3333 30 - 20 - 24.7 - Browning Glacier 48 33 34 113 0 39 4355 25 - 40 - 86.1 - Bynum 4 SSE Teton 47 56 0 112 18 0 4022 24 - 15 - 23.1 - Canyon Creek Lewis & Clark 46 49 0 112 15 0 4314 13 - 18 - 29.0 - Carter 14 W Chouteau 47 47 31 111 13 10 3450 10 11 11 16 12.2 (18.8) Cascade 5 S Cascade 47 13 10 111 42 36 3360 76 - 28 - 25.2 - Chinook Blaine 48 35 6 109 14 1 2345 10 - 29 - 58.7 - Choteau Teton 47 49 14 112 11 31 3845 39 - 20 - 19.0 - Cut Bank Municipal AP Glacier 48 36 30 112 22 34 3838 51 - 18 - 17.0 - Deep Creek Pass 2 Broadwater 46 22 0 111 8 0 5440 14 - 39 - 71.5 - Del Bonita Glacier 48 59 54 112 47 19 4337 14 15 18 25 29.3 (42.9) Dunkirk 15 NNE Toole 48 42 0 111 36 0 3383 39 - 27 - 29.0 - East Glacier Glacier 48 26 49 113 13 26 4806 25 - 83 - 184.7 - Fairfield Teton 47 36 55 111 59 8 3983 32 33 29 30 37.2 (44.7) Flatwillow 4 ENE Petroleum 46 51 4 108 18 48 3133 11 12 23 25 37.4 (55.7) Fort Assinniboine Hill 48 29 54 109 47 50 2613 22 23 28 29 36.1 (46.0) Fort Benton Chouteau 47 48 51 110 40 19 2636 36 - 26 - 27.8 - Fort Logan 4 ESE Meagher 46 39 17 111 5 38 4710 40 - 36 - 51.3 - Galata 16 SSW Toole 48 14 45 111 24 21 3100 17 - 19 - 23.2 - Geraldine Chouteau 47 35 52 110 15 56 3130 39 - 26 - 27.7 - Gibson Dam Lewis & Clark 47 36 6 112 45 13 4590 40 - 30 - 51.4 - Goldbutte 7 N Toole 48 58 34 111 23 58 3498 20 21 19 25 25.4 (36.2) Grass Range Fergus 47 1 32 108 48 12 3490 27 - 29 - 32.4 - Great Falls Cascade 47 31 0 111 18 0 3353 10 - 18 - 31.0 - Great Falls Int'l Airport Cascade 47 28 24 111 22 56 3664 49 - 24 - 24.1 - Harlowton Wheatland 46 25 59 109 49 50 4162 41 - 24 - 28.6 - Havre City/County AP Hill 48 32 34 109 45 48 2585 35 - 28 - 46.8 - Helena Regional AP Lewis & Clark 46 36 20 111 57 49 3828 47 - 23 - 25.5 - Highwood 7 NE Chouteau 47 38 32 110 40 5 3600 26 - 27 - 32.2 - Hobson Judith Basin 47 0 0 109 52 0 4081 14 - 38 - 67.1 - Hogeland 7 WSW Blaine 48 49 0 108 48 0 3351 21 - 30 - 55.0 - Holter Dam Lewis & Clark 46 59 29 112 0 44 3487 28 29 14 21 18.3 (22.8) Joplin Liberty 48 33 37 110 46 15 3325 25 - 26 - 32.9 - Kremlin Hill 48 31 18 110 6 27 2860 37 - 28 - 37.3 - Lewistown Municipal AP Fergus 47 2 57 109 28 0 4145 51 - 33 - 52.3 - 82 Number of Years of Data (inches) (psf)
Page 1 and 2: Snow Loads for Structural Design in
Page 3 and 4: List of Figures 1.1 Map of Montana
Page 5 and 6: Preface This report provides recomm
Page 7 and 8: ASCE 7-02. Presented in Appendix A
Page 9 and 10: The contour maps at the end of this
Page 11 and 12: Table 1.1: Design Snow Loads at Mon
Page 19 and 20: CONTOUR INTERVALS 25 30 354045 500
Page 21 and 22: Chapter 2 Snow Load Design Examples
Page 23 and 24: calculation is provided in Example
Page 25 and 26: 2.2 Example 2 - Drifting Snow Requi
Page 27 and 28: Table 2.3: Cutout from Table 1.1 St
Page 29 and 30: pg = 198.7psf (same as example 3).
Page 31 and 32: 2.8 References Ellingwood, B., and
Page 33 and 34: Station NWS station name. The stati
Page 35 and 36: Snow loads for the SNOTEL stations
Page 37 and 38: Station County Table A.1: Snow load
Page 41: Station County Table A.3: Snow load
Page 45 and 46: Station County Latitude Longitude E
Page 51 and 52: Station County Latitude Longitude E
Page 55 and 56: A.2 National Weather Service (NWS)
Page 57 and 58: Therefore, a snow season consisting
Page 59 and 60: tions. The lognormal and the log-Pe
Page 61 and 62: A.4 Determining the 50-year MRI Gro
Page 63 and 64: snow course station data could be l
Page 65 and 66: snow loads that result when the sam
Page 67 and 68: Data Snow Depth/ Water Equivalent D
Page 69 and 70: Region 2 - 4000 ft to 5000 ft Regio
Page 71 and 72: Region 4 - 4000 ft to 5000 ft Regio
Page 73: Region 6 - 4000 ft to 5000 ft Regio

Snow Loads for Structural Design in Montana (Revised 2004)

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