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 5
Leyden Creek
Floodplain and Floodway Data for roO-Year Flow

Flooding Source 100-yr Floodplain Data Floodway Data
0.5-foot rise in EGL 1.0-foot rise in EGL
Thalweg Floodway Width (ft) Floodway Floodway
Identification Cross Section Station Elevation Discharge Flood Elevation Elevation Floodway Width (ft) Elevation
(NA VD 88) (crs) (NA VD 88) Left - Right- Total (NA VD 88) Left - Right - Total (NA VD 88)
Upstream of Ralston Creek Confluence 500 3+74.92 5665.6 2456 5423.8 26 89 tt5 5424.3 26 89 tt5 5423.8
50t to+81.85 5424.0 2456 5429.1 tt 212 222 5429.3 tt 137 t48 5429.6
Sinuns Street 502 15+42.2t 5427.3 2456 5433.0 tt 278 289 5433.3 tt t69 180 5433.6
503 16+{)3.22 5427.8 2456 5434.2 65 60 125 5434.0 35 39 74 5434.2
504 2t+tO.tt 5431.4 2456 5437.5 177 86 263 5437.7 83 86 169 5438.2
504.5 24+ 13.39 5434.0 2456 5439.5 150 9 158 5439.6 70 26 96 5439.6
W. 72nd Avenue 505 28+42.95 5436.0 2456 5442.2 2tO 40 250 5442.5 60 40 100 5442.6
506 29+20.95 5436.8 2456 5444.4 178 20 198 5444.3 58 20 78 5443.3
507 32+76.14 5438.0 2192 5444.0 35 23 58 5444.1 43 44 87 5444.8
508 37+91.38 5441.8 2192 5449.1 7 298 304 5449.4 37 80 tt7 5449.4
509 44+95.33 5440.0 2192 5450.0 94 t07 200 5450.4 25 93 tl8 5451.0
5tO 50+32.14 5452.0 1519 5454.8 135 23 t58 5455.2 tt7 23 140 5455.6
5tt 57+91.78 5456.5 1519 5460.8 32 64 96 5460.8 32 26 59 5460.9
511.5 63+83.39 5460.0 t035 5463.1 41 36 77 5463.3 41 36 77 5463.7
5t2 70+27.21 5463.3 t035 5465.5 35 34 69 5465.5 35 34 69 5465.5
W. 75th Place 513 76+35.97 5466.4 1035 5470.0 40 85 125 5470.0 40 85 125 5470.0
514 78+00.98 5466.0 1035 5473.5 55 52 to? 5473.5 36 39 75 5474.4
514.5 84+42.74 5472.6 t035 5474.2 96 86 t82 5474.4 96 86 t82 5474.9
515 89+{)7.63 5474.5 t035 5477.8 t02 46 t48 5477.6 t02 46 148 5477.2
516 94+71.81 5480.0 1035 5485.5 29 25 54 5485.5 21 18 39 5485.8
517 95+50.32 5480.7 t035 5486.4 39 36 75 5486.9 21 36 57 5487.1
517.5 99+15.94 5485.0 1035 5488.0 40 44 84 5488.2 40 44 84 5488.2
Alkire Street 518 t05+ 30.25 5487.7 1035 5493.7 31 529 560 5493.1 21 6 27 5493.0
519 105+92.86 5488.0 1035 5494.8 13 12 25 5494.1 13 12 25 5494.1
520 tt0-Hl8.90 5493.8 373 5495.6 t6 18 34 5495.8 16 12 28 5496.0
520.25 tt2+46.51 5495.0 373 5498.0 24 4 28 5498.t 24 4 28 5498.3
520.75 t20+48.62 5498.7 373 5502.t 15 14 28 5502.1 15 t4 28 5502.0
52t t25+46.32 5501.5 373 5504.3 to 18 28 5504.3 to t8 28 5504.4
521.25 t29+ to.15 5506.0 373 5508.5 t2 8 20 5508.6 12 8 20 5508.6
521.75 133+{)5.45 5508.6 373 5511.8 t9 7 26 55t2.0 19 7 26 5512.0
522 t40+54.69 5517.0 373 5518.2 21 25 46 5518.3 12 t8 30 5518.7
522.5 t45+85.54 5520.6 373 5522.4 24 26 50 5522.6 t6 12 28 5523.1
523 t51+t8.01 5529.2 373 5530.9 42 8 50 5530.9 28 0 28 5531.3
524 155+82. to 5536.0 373 5536.9 28 85 tt3 5537.2 28 33 61 5537.6
525 162+{)7.97 5538.8 373 5541.4 13 17 30 5541.6 13 17 30 5541.7
525.5 167+56.46 5545.4 373 5546.4 41 19 60 5546.7 21 19 40 5547.0
526 171+47.00 5550.0 373 5551.5 43 36 79 5551.5 20 20 40 5551.7
Croke Canal 527 175+{)3.30 5552.3 373 5556.3 57 12 68 5556.3 57 12 68 5556.3
528 176+19.79 5553.t 373 5560.9 32 29 60 5560.9 32 29 60 5561.8
Indiana Street 529 177+18.45 5553.5 373 5560.9 36 3t 67 5560.9 36 3t 67 5561.8
530 177+85.05 5554.8 373 5564.3 55 27 82 5564.3 55 27 82 5565.2
53t 180+66.88 5561.7 373 5564.2 t5 2t 36 5564.2 t5 21 36 5565.0

- Distance Left and Right from Reference Line Looking Downstream

23

Floodplam Rt.ferenc.e Data5_18j)4.xh
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