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) Big Timber 23.8 (26.9) 0.0 36.5 (42.4) 66.1 24.0 (26.6) 0.0 36.8 (41.6) 66.5 Billings Logan Int'l AP 24.9 - 26.5 31.7 - 40.0 22.3 - 22.0 27.2 - 35.5 Bridger 1 S 22.9 - 23.0 28.2 - 36.5 23.6 - 24.2 29.4 - 37.7 Cooke City 2 W 76.3 - 39.2 135.4 - 192.1 75.5 - 37.5 133.7 - 190.3 Edgar 9 SE 35.6 - 17.2 59.8 - 89.4 34.7 - 15.2 57.9 - 87.5 Gardiner 22.3 (31.3) 0.0 31.5 (45.9) 88.1 20.7 (27.1) 0.0 28.9 (39.0) 85.6 Gibson 2 NE 26.5 - 0.0 41.5 - 71.1 26.8 - 0.0 42.0 - 71.7 Jardine 84.3 - 57.9 154.1 - 210.8 71.3 - 28.0 124.2 - 180.9 Joliet 24.9 - 26.4 31.6 - 40.0 25.9 - 28.3 33.5 - 41.8 Laurel 3 WSW 26.7 - 29.8 35.0 - 43.3 22.0 - 21.5 26.7 - 35.0 Livingston 12 S 21.7 - 0.0 32.8 - 62.4 24.3 - 0.0 37.4 - 67.0 Livingston Mission Field 22.4 - 0.0 33.9 - 63.6 22.6 - 0.0 34.4 - 64.0 Mystic Lake 55.0 - 0.0 89.6 - 146.3 53.1 - 0.0 85.9 - 142.5 Nye 2 39.6 - 25.9 68.6 - 98.2 34.4 - 14.7 57.4 - 87.0 Rapelje 4 S 18.4 (26.5) 0.0 26.9 (41.6) 56.5 19.5 (23.0) 0.0 28.8 (35.0) 58.4 Red Lodge 2 N 62.6 - 9.0 105.2 - 161.9 57.9 - 0.0 95.5 - 152.2 Wilsall 8 ENE 34.6 (47.4) 0.0 51.7 (74.9) 108.4 34.7 (43.3) 0.0 51.8 (67.2) 108.5 87
Station County Table A.6: Snow load data for NWS stations in Region 6 Latitude Longitude Elevation ' " ' " (ft) Max. Recorded Depth Calculated Snow Load Albion 1 N Carter 45 12 39 104 15 59 3312 17 18 16 24 19.4 (29.4) Baker 1 E Fallon 46 21 59 104 15 32 2940 27 - 32 - 45.7 - Biddle Powder River 45 5 54 105 20 17 3329 10 - 9 - 9.4 - Biddle 8 SW Powder River 45 2 26 105 29 10 3596 26 - 36 - 48.9 - Birney Rosebud 45 19 29 106 30 45 3160 11 12 20 26 31.8 (45.8) Brandenberg Rosebud 45 48 58 106 13 53 2770 42 43 20 22 24.7 (27.1) Bredette Roosevelt 48 32 51 105 16 14 2638 43 - 19 - 24.1 - Broadus Powder River 45 26 36 105 24 30 3032 40 - 28 - 46.6 - Brusett 3 W Garfield 47 27 53 107 18 41 2974 24 - 34 - 54.2 - Busby Big Horn 45 32 23 106 57 35 3430 44 - 27 - 36.2 - Circle McCone 47 24 44 105 35 42 2475 19 - 33 - 75.3 - Circle 7 N McCone 47 31 0 105 34 0 2431 15 - 16 - 25.8 - Cohagen Garfield 47 3 24 106 37 0 2727 29 - 35 - 47.2 - Colstrip Rosebud 45 53 40 106 38 1 3218 27 28 16 16 18.3 (19.6) Culbertson Roosevelt 48 9 1 104 30 33 1942 30 31 27 34 42.3 (54.6) Custer Yellowstone 46 8 0 107 32 0 2743 14 - 21 - 29.9 - Dodson Phillips 48 23 32 108 14 36 2280 14 - 21 - 35.7 - Forks 4 NNE Phillips 48 46 40 107 27 13 2599 50 - 37 - 57.8 - Forsyth 2 E Rosebud 46 16 0 106 37 0 2723 25 - 15 - 21.6 - Glasgow #2 Valley 48 11 34 106 38 18 2090 14 - 19 - 25.0 - Glasgow 15 NW Valley 48 21 4 106 51 25 2118 13 - 16 - 20.9 - Glasgow Int'l AP Valley 48 12 50 106 37 17 2285 51 - 21 - 22.6 - Glendive Dawson 47 6 23 104 43 6 2076 50 51 17 27 15.6 (20.2) Harb Phillips 48 14 0 107 24 38 2542 17 - 18 - 27.9 - Hardin Big Horn 45 43 57 107 36 33 2905 13 14 15 35 14.7 (42.2) Haxby 18 SW Garfield 47 34 0 106 42 0 2651 28 - 28 - 39.5 - Huntley Exp. Station Yellowstone 45 55 22 108 14 42 3000 21 22 22 24 27.3 (33.4) Hysham 25 SSE Treasure 45 56 7 107 8 15 3100 32 - 27 - 41.3 - Ingomar 14 NE Rosebud 46 44 21 107 12 31 2795 38 - 25 - 34.8 - Kirby 1 S Big Horn 45 19 0 106 59 0 3953 13 - 25 - 40.1 - Lame Deer Rosebud 45 37 33 106 39 51 3300 20 - 24 - 32.5 - Lindsay Dawson 47 13 31 105 9 8 2690 35 - 22 - 20.7 - Lustre 4 NNW Valley 48 27 0 105 56 0 2923 41 - 25 - 32.3 - MacKenzie Fallon 46 8 32 104 44 7 2810 30 - 23 - 26.9 - Malta Phillips 48 21 0 107 52 0 2260 29 30 25 26 29.6 (35.4) Malta 35 S Phillips 47 50 30 107 57 20 2605 26 - 39 - 60.1 - Medicine Lake 3 SW Sheridan 48 28 58 104 27 5 1942 53 - 33 - 48.5 - Mildred Prairie 46 41 0 104 57 0 2411 39 - 22 - 22.3 - Miles City Custer 46 24 0 105 49 0 2362 64 - 29 - 25.6 - Miles City Municipal AP Custer 46 25 41 105 53 10 2628 51 - 21 - 26.8 - 88 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 45 and 46: Station County Latitude Longitude E
Page 47: Station County Table A.5: Snow load
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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