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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Floodplain Reference Data 5_183)4.111s

Table 2
Ralston Creek
Floodplain Data Table for 10-, 50-, and 500-Year Discharges

Flooding Source lO-yr Floodplain Data SO-yr Floodplain Data SOO-yr Floodplain Data
Thalweg Elevation Discharge Flood Elevation Discharge Flood Elevation Discharge Flood Elevation
Identification Cross Section Station (NA VD 88) (cfs) (NA VD 88) (cfs) (NA VD 88) (cfs) (NA VD 88)
Clear Creek Confluence 100 2+18.09 5249.6 409t 5256.6 7932 5257.5 13200 5258.7
101 7+04.t7 5252.2 409t 5259.0 7932 5260.4 13200 5261.9
102 8+07.68 5252.1 4091 5259.3 7932 5260.7 13200 5261.5
West 56th Avenue 102.5 Bridge Bridge Bridge
103 9+06.08 5251.9 409t 5259.5 7932 5261.2 13200 5263.9
t04 10+50.13 5257.5 409t 5262.5 7932 5264.3 13200 5266.3
105 17+09.04 5260.6 409t 5267.4 7932 5269.5 13200 5270.9
106 22+71.87 5263.0 409t 5270.0 7932 5272.0 13200 5273.7
107 24+53.1 5263.5 409t 5270.6 7932 5272.7 13200 5274.7
C&S Railroad 107.5 Bridge Bridge Bridge
108 25+06.9 5263.6 409t 5271.3 7932 5273.7 13200 5275.9
109 26+73.79 5267.8 409t 5273.4 7932 5275.3 13200 5277.&
110 32-t46.2t 5268.9 409t 5277.1 7932 5279.4 13200 5282.5
III 38+ 11.87 5271.5 409t 5278.1 7932 5280.3 13200 5282.9
Ralston Road 112.5 Bridge Bridge Bridge
114 42+03.94 5273.7 409t 5281.8 7932 5286.0 13200 5285.3
115 42+88.2t 5274.0 409t 5282.3 7932 5286.7 13200 5289.0
Lamar Street 115.5 Bridge Bridge Bridge
116 43+71.43 5275.6 4091 5282.4 7932 5287.9 13200 5289.4
117 44+92.04 5275.6 409t 5283.1 7932 5287.5 13200 5289.4
118 45+58.3t 5282.0 409t 5286.3 7932 5288.0 13200 5290.3
119 46+88.4 5282.1 4091 5287.7 7932 5289.3 13200 5291.t
120 49+63.46 5280.9 4091 5291.6 7932 5294.3 13200 5295.7
Noland Street 120.5 Culvert Culvert Culvert
121 50+46.54 5280.9 4091 5294.9 7932 5296.2 13200 5297.3
122 52+09.58 5282.5 4091 5294.7 7932 5295.8 13200 5296.9
123 56+07.72 5283.7 4091 5295.7 7932 5297.5 13200 5299.2
124 60+21.98 5286.1 4091 5295.4 7932 5298.0 13200 5299.8
Pierce Street 124.5 Bridge Bridge Bridge
125 60+77.13 5286.2 4091 5298.6 7932 5300.2 13200 5301.3
126 62-t41.49 5287.0 4091 5298.8 7932 5300.4 13200 5301.5
127 67+77.53 5288.6 4091 5298.8 7932 5300.3 13200 5301.5
128 73+29.32 5290.6 4091 5299.4 7932 530l.t 13200 5302.3
Wadsworth Bypass (SH 121) t28.5 Bridge Bridge Bridge
129 75+32.9 5292.6 409t 5301.2 7932 5303.0 13200 5304.3
130 79+96.62 5295.8 409t 5304.7 7932 5306.5 13200 5307.4
t31 85+ 10.26 5299.3 409t 5307.5 7932 5308.8 13200 5310.1
132 90+47.05 5300.2 4091 5311.t 7932 5313.2 13200 53t5.4
t33 92+50.58 5301.4 4091 5312.7 7932 5315.3 13200 5316.5
Old Wadsworth Blvd. 133.5 Bridge Bridge Bridge

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