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

I
I
I
I
I
I
I.
I
1
I
I
I
I
I
I
I
I
I
I

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

Flooding Source 100-yr Floodplaiu Data Floodway Data
0.5-foot rise in EGL 1.0-foot rise in EGL
Thalweg Floodway Width (ft) .'Ioodway Floodway Width (ft) Floodway
Identification Cross Section Station Elevation Discharge Flood Elevatiou Elevation Elevation
(NA VD 88) (cfs) (NA VD 88) Left ' Right' Total (NA VD 88) Left ' Right' Total (NA VD 88)
t41 t23+37.71 5320.7 9700 5335.8 44 36 80 5336.0 40 40 80 5336.2
142 125+98.96 5323.5 9700 5336.7 153 107 260 5336.9 48 71 125 5336.3
143 130+14.98 5324.4 9700 5336.6 170 110 280 5337.1 47 113 160 5337.3
144 133+ 10.38 5326.0 9700 5338.2 151 39 190 5338.2 111 44 155 5338.4
145 139+09.27 5328.0 9700 5340.1 108 68 176 5339.6 103 68 171 5340.1
146 142+73.45 5329.7 9700 5341.9 157 293 450 5341.8 III 146 257 5341.6
146.5 147+86.13 5334.0 6795 5344.0 119 251 370 5344.5 105 220 325 5344.9
147 153+17. 5336.0 6795 5346.4 35 295 330 5346.5 36 264 300 5347.2
148 154+48.27 5336.8 6795 5346.7 20 405 425 5347.2 30 289 319 5347.4
Garrison Street 148.5 Bridge
149 t55+21.24 5337.2 6795 5348.3 21 404 425 5348.1 32 327 359 5348.1
150 156+18.29 5337.9 6795 5349.1 66 626 692 5349.3 42 371 413 5349.5
t50.5 t6O+24.56 5337.6 6795 5350.4 t57 172 329 5350.9 102 60 162 5351.4
151 t64+47.66 5343.3 6795 5351.6 95 53 t47 5351.6 50 65 115 5351.7
152 168+72.67 5343.9 6795 5354.0 72 68 140 5353.3 59 56 115 5353.7
153 174+t8.08 5346.t 6795 5357.0 84 71 t55 5356.6 53 62 115 5356.4
154 176+17.96 5349.3 6795 5359.4 250 126 376 5358.7 260 26 286 5358.6
Brooks Drive 154.5 Culvert
155 176+92.5 t 5349.6 6795 5359.7 666 56 722 5359.7 415 30 445 5359.9
155.5 180+33.21 5352.7 6795 5361.7 906 26 931 5362.3 499 272 77t 5362.0
156 184+29.78 5355.2 6795 5364.6 744 62 806 5364.9 526 62 588 5364.6
157 185+49.15 5355.6 6795 5364.7 707 63 770 5364.9 461 93 554 5365.1
West 61st Avenue 157.5 Culvert
158 186+12.68 5356.2 6795 5365.0 640 233 873 5365.3 456 234 690 5365.8
159 187+03.12 5356.8 6795 5366.0 692 312 1004 5366.4 404 3t2 716 5366.9
160 190+53.t 5358.4 6795 5367.7 472 681 1154 5368.0 331 459 790 5368.7
160.5 195+29.34 5361.4 6795 5370.5 131 547 678 5370.7 131 467 598 5371.2
161 198+22.54 5362.6 6795 5372.7 131 509 640 5373.2 131 407 538 5373.4
162 199+40.78 5363.3 6795 5373.7 144 541 685 5374.1 131 390 521 5374.6
Rensselaer 162.5 Culvert
163 200+t4.95 5363.5 6795 5375.3 130 629 759 5375.4 128 247 375 5375.5
164 204+25.69 5366.0 6795 5377.1 122 700 822 5377.3 164 385 549 5377.5
165 209+72.36 5369.0 6795 5380.5 87 566 653 5380.9 87 506 593 5381.4
166 2t6+58.19 5373.8 6795 5383.6 67 t41 208 5384.t 67 83 150 5384.3
167 222+22.18 5376.0 6795 5386.1 26 135 161 5385.3 20 144 164 5386.0
168 224+51.48 5377.5 6795 5386.8 62 157 219 5386.6 62 98 160 5386.5
Miller Street 168.5 Bridge
169 225+59.49 5378.3 6795 5388.7 8t 378 459 5388.0 80 95 175 5388.3
170 226+74.96 5378.4 6795 5389.8 184 173 357 5389.8 51 151 202 5389.9
171 231 +89 .62 5382.0 6795 5391.9 102 183 286 5392.1 54 156 210 5392.6
172 235+34.22 5384.0 6795 5391.8 149 177 326 5392.2 21 154 175 5392.7
173 239+63.88 5388.0 6795 5396.8 249 164 413 5396.5 80 291 371 5395.8
174 243+03.82 5389.9 6795 5400.3 642 236 878 5400.7 98 255 353 5401.0
Oak Street 174.5 Culvert
175 243+80.17 5390.1 6795 5402.0 612 141 753 5402.3 142 118 260 5402.0
176 248+07.65 5394.2 6795 5403.5 516 18 534 5403.6 133 45 178 5403.8
177 250+92.67 5395.5 6795 5406.5 381 66 447 5406.3 99 58 157 5406.2
178 254+80.72 5398.0 6795 5408.4 449 36 485 5408.5 341 38 379 5408.7

* Distance Left and Right of Reference Line Looking Downstream

19

Floodplain Reference Data5_28_04.xls
612212004