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
I
I
I
I
I
I
I
I
I
I
I

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

Flooding Source 100-yr Floodplain Data Floodway Data
0.5-foot rise in EGL 1.0-foot rise in EGL
Thalweg t'loodway Ftoodway Width (ft) Floodway
Identification Cross Section Station Elevation Discharge Flood Elevation F\oodway Width (ft) Elevation Elevation
(NA VD 88) (efs) (NA VD 88) Left ' Right' Total (NA VD 88) Left' Right' Total (NA VD 88)
West 68th Avenue \78.5 Bridge
179 255+57.1 5399.0 6795 5409.0 448 37 485 5409 .4 322 36 358 5409.8
180 258+67.08 5404.0 6795 5412.7 744 15 759 5413.\ 678 15 693 5413.4
180.5 262+ 18.63 5404.9 6795 54\3.9 515 38 553 5414.4 426 38 464 5414.8
18\ 266+32.1 54\4.0 6795 54\8.3 422 120 543 5418.6 145 92 237 5418.5
182 272+16.49 5415.7 6795 5422.0 ll6 39 155 5422.3 145 58 203 5422.4
t83 276+18.79 54t7.7 452t 5423.0 78 67 145 5423.3 69 32 101 5423.3
183.5 278+63.56 54t9.4 452t 5425.7 S4 II 65 5425.7 51 9 60 5425.8
184 279+25.67 5420.0 4521 5426.9 40 30 70 5426.9 30 31 61 5426.9
Simms Street 184.5 Bridge
185 280+02.t8 5420.0 4521 5429.6 36 34 70 5430.0 42 42 84 5430.2
t86 283+93.25 5421.9 4521 5430.6 14 79 94 5430.6 23 64 87 5430.7
187 287+52.75 5424.0 4521 5431.4 76 74 150 5431.9 39 64 103 5431.9
188 290+82.77 5426.6 4521 5434.3 61 55 tl6 5433.9 45 45 90 5434.5
189 294+ 12.27 5429.2 4521 5436.6 52 90 t42 5436.8 52 60 tl2 5437.4
t90 294+74.03 5429.6 4521 5438.0 4t 92 133 5438.3 54 66 120 5438.3
19t 294+87.6 5430.8 4521 5438.7 50 126 176 5439.2 54 66 120 5438.4
192 298+04.3 5433.8 452t 5442.5 78 272 350 5442.7 77 273 350 5442.5
193 303+86.81 5441.2 452t 5447.1 43 5t7 560 5447.3 48 326 374 5447.8
194 308+19.18 5443.7 4521 5452.0 42 133 175 5451.7 41 134 175 5451.6
Ward Road 194.5 Bridge
t95 309+ 17.56 5443.6 4521 5453.3 189 161 350 5453.0 73 92 165 5453.2
196 315+58.43 5448.6 4521 5457.0 30 232 262 5456.7 30 193 223 5457.0
t97 321+85.17 5454.0 4521 5461.2 29 88 ll8 5461.6 24 71 95 5461.9
198 324+84.28 5455.9 452t 5463.9 43 84 127 5463.7 43 38 81 5464.0
199 331+30.84 5462.2 4521 5468.1 99 25 124 5468.4 99 25 \24 5468.7
200 337+82.66 5469.8 452t 5474.1 \24 13 137 5474.2 104 II tiS 5474.4
20\ 344+31.33 5476.0 452t 5481.4 49 69 ll8 5481.5 41 54 95 5481.9
Beech Street 201.5 Bridge
202 345+ \0.37 5478.0 4521 5484.0 78 72 150 5484.0 78 8\ \59 5484.0
203 351+60.15 5482.0 4389 5487.7 76 168 244 5487.7 40 \20 \60 5488.6
204 357+92.ll 5487.9 4389 5492.5 \66 36 202 5492.8 130 36 166 5492.9
205 364+29.5 5491.5 4389 5497.9 99 58 158 5498.0 76 44 120 5498.4
206 368+37.0 I 5496.0 4389 5502.7 79 39 tl8 5502.5 63 35 98 5502.7
207 371+39.83 5499.8 4389 5509 .2 32 34 66 5509.7 35 36 71 5510.0
Eldridge Street 207.5 Bridge 0 0
208 372+25.13 5501.0 4389 5511.8 36 159 195 55\0.4 38 39 77 5509.7
209 375+21.61 5501.9 4389 55\1.9 45 75 \20 55\1.7 30 45 75 5511.4
210 380+36.59 5506.0 4389 55\4.0 4\ 64 105 55\4.5 4\ 64 105 55\4.5
2t1 387+83.33 55\1.7 4398 55\9.6 10 t85 \96 5519.7 49 10\ \50 5520.\
212 398+52.87 5517.t 4398 5523.3 75 54 129 5523.6 58 36 94 5524.0
213 407+42.06 5522.8 4398 5529.4 100 100 200 5529.6 100 100 200 5529.7
214 415+64.97 5530.0 4398 5535.1 169 192 361 5535.3 156 \44 300 5535.5
215 417+65.31 5531.0 4398 5536.4 49 39 88 5536.3 42 42 84 5536.9
Indiana Street 215.5 Bridge
216 419+t5.34 5531.1 4398 5540.2 65 t6 81 5540.2 65 16 81 5540.2
217 423+04. 5534.5 4409 5542.7 98 127 225 5542.6 98 72 170 5542.7
218 429+34.13 5539.9 4409 5546.8 140 ll2 252 5547.1 102 68 170 5547.3

, Distance Left and Right of Reference Line Looking Downstream

20

Aoodplain Reference Data 5_28_()<Lds
6/2212004