FLOOD08569

• Designation Number: 574
• County: Jefferson
• Community: Arvada
• Stream Name: Ralston Creek and Leyden Creek
• Basin: South Platte
• Title: FHAD - Ralston Creek and Leyden Creek
• Date: 6/1/2004
• Prepared For: Douglas County, Arvada
• Prepared By: UDFCD
• Floodplain - Doc Type: Floodplain Report/Masterplan

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Table 3
Ralston Creek
Floodplain and Floodway Data Table for 100- Year Discharges

Flooding Source l00-yr Floodplain Data Floodway Data
O.S-foot rise in EGL l.O-foot rise in EGL
Thalweg Floo<lway Floodway Width (ft) Noodway
Identification Cross Section Station Elevation Discharge Flood Elevation Floodway Width (ft) Elevation Elevation
(NA VD 88) (cfs) (NA VD 88) Left' Right' Total (NA VD 88) Left ' Right' Total (NA VD 88)
Clear Creek Confluence 100 2+18.09 5249.6 9700 5257.9 234 73 308 5258.0 176 73 249 5258.2
lOt 7+04.t7 5252.2 9700 5261.1 127 81 208 5261.0 127 81 208 5261.3
102 8+07 .68 5252.1 9700 5261.0 92 86 178 5261.2 92 86 178 5261.4
West 56th Avenue 102.5 Bridge
103 9+06.08 5251.9 9700 5263.0 89 92 181 5263.0 89 92 181 5263.0
104 10+50.13 5257.5 9700 5265.0 62 t23 t85 5264.8 62 t23 t85 5264.9
105 17+09.04 5260.6 9700 5270.t 56 298 354 5270.6 64 tt6 180 5270.1
106 22+71.87 5263.0 9700 5272.6 57 119 176 5272.7 57 tt9 176 5272.8
107 24+53.1 5263.5 9700 5273.5 90 t27 217 5273.6 90 127 2t7 5273.5
C&S Railroad 107.5 Bridge
108 25+06.9 5263.6 9700 5274.5 69 104 173 5274.7 90 83 173 5274.3
109 26+73.79 5267.8 9700 5276.3 90 83 134 5276.0 78 56 134 5276.0
ttO 32->46.21 5268.9 9700 5280.1 67 58 125 5280.t 59 57 116 5280.0
Itt 38+11.87 5271.5 9700 5281.1 50 62 tt2 528l.t 50 60 110 528l.t
Ralston Road tt2.5 Bridge
114 42+03.94 5273.7 9700 5286.5 59 54 tt3 5286.9 60 60 t20 5287.3
115 42+88.21 5274.0 9700 5287.5 209 84 293 5287.8 50 82 132 5288.0
Lamar Street 115.5 Bridge
tt6 43+71.43 5275.6 9700 5288.9 192 85 277 5289.1 36 78 tt4 5289.7
tt7 44+92.04 5275.6 9700 5288.5 150 127 277 5289.1 39 75 tt4 5289.2
tt8 45+58.31 5282.0 9700 5288.7 179 123 302 5289.2 62 9t t53 5289.3
119 46+88.4 5282.1 9700 5289.7 69 109 178 5289.7 53 89 t42 5289.9
120 49+63.46 5280.9 9700 5294.9 28 143 172 5294.7 33 III 144 5294.8
Noland Street 120.5 Culvert
121 50+46.54 5280.9 9700 5296.6 28 t43 172 5295.3 36 108 144 5295.0
122 52+09.58 5282.5 9700 5295.8 92 82 173 5295.8 92 62 t54 5295.8
123 56+07.72 5283.7 9700 5298.3 8t 174 255 5298.7 77 t40 217 5298.9
124 60+21.98 5286.1 9700 5298.7 77 363 440 5299.2 78 162 240 5299.2
Pierce Street 124.5 Bridge
125 60+77.13 5286.2 9700 5300.6 221 357 578 5300.9 71 154 225 5300.0
126 62->41.49 5287.0 9700 5300.8 286 264 550 530l.t 136 69 205 5300.8
127 67+77.53 5288.6 9700 5300.8 248 226 474 5301.0 85 79 164 5301.0
128 73+29.32 5290.6 9700 530t.5 99 107 206 5301.9 100 t09 209 5302.5
Wadsworth Bypass (SH t2t) 128.5 Bridge
129 75+32.9 5292.6 9700 5303.5 165 183 348 5303.9 100 165 265 5304.5
130 79+96.62 5295.8 9700 5306.9 107 343 450 5306.9 ttO 235 345 5306.9
131 85+ 10.26 5299.3 9700 5309.2 151 3t3 465 5309.6 165 250 415 5310.0
132 90+47.05 5300.2 9700 53t3.6 125 35 160 5313.5 80 63 143 5313.8
133 92+50.58 5301.4 9700 53t6.7 108 46 154 5316.7 t08 46 t54 5317.0
Old Wadsworth Blvd. 133.5 Bridge
134 93+39.9 5301.6 9700 5317 .3 107 37 144 5317.3 142 142 5317.5
135 94+82.84 5303.8 9700 5317.2 59 64 123 5317.0 89 64 t53 53t7.4
136 101->45.3 5306.t 9700 5318.4 234 63 297 5318.8 140 40 180 5318.4
137 108+35.3 5309.3 9700 5321.8 143 46 189 5321.7 100 44 t44 5322.4
138 113+04.81 5312.7 9700 5326.2 33 146 179 5326.0 33 102 135 5326.1
139 119+80.64 5317.4 9700 5330.6 197 52 250 533l.t t60 40 200 5331.6
140 122+55.79 5320.0 9700 5330.7 57 24 8t 533l.t 50 67 tt7 5331.7
Carr Street t40.5 Bridge

, Distance Left and Right of Reference Line Looking Downstream

18

Floodplain Reference Data 5_28_04.x1s
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