FLOOD04416

• Designation Number: 304
• County: Adams
• Community: Unincorporated Adams County
• Stream Name: Big Dry Creek, (ADCO), North area tributaries
• Basin: South Platte
• Title: Flood Hazard Area Delineation - Big Dry Creek, ADCO, North Area Tributaries
• Date: 7/1/1989
• Designation Date: 1/1/1990
• Floodplain - Doc Type: Floodplain Report/Masterplan

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TABLE IV-1
FLOOD HAZARD DATA FOR 100-YEAR STORM (CONT...)

SIIIX CIIEBC !IIIIII
Fl ood1 ng SalI"Ce llJD..:year Fl"",*>lain Ilata Fl~ Ilata
Fl~ Width 3
ltJD.,year Thal""9 Flood Velocit/ 4 Fl~
Identification Stationl Ofscharge Elevation Elevation Fl"",*>lain Left Ri!tlt Total Vel. Elevatioo
(efs) (MSl) (MSl) lItdth (ft) (fps) (feet) (feet) (feet) 1fE!l (MSl)
Sad< Creek 0+00 11m 5126.8 5129.9 78J 0.9 240 28J 520 1.6 5130.4
Conf1 uence 6+35 1160 5131.7 5133.5 245 5.6 70 8J l!ll 6.3 5133.4
11+8J 1160 5139.0 5140.3 850 2.3 100 160 260 3.0 5140.7
17+!ll 1160 5146.7 5147.3 620 4.3 190 60 2!ll 5.2 5147.6
23+30 11m 5154.0 5155.5 715* 2.5 175 35 210 3.4 5155.7
29+m 1160 5159.0 51m.5 7!ll* 3.0 560 90 650 3.1 5160.6
Washington St. 30+1:6 960 5159.5 5164.0 690 1.3 600 90 690 1.3 5164.0
3Jt55 960 5159.5 5164.0 1190 0.3 590 110 700 0.4 5164.0
37+!ll 960 5165.0 5165.5 3!ll 5.1 150 20 170 5.7 5165.6
42+65 960 5168.7 5171. 5 630* 2.6 70 !ll 120 3.8 5171.8
47+95 840 5176.5 5177.1 4!ll 4.2 120 30 150 5.6 5177.3
52+80 840 5181.5 5183.2 400 2.2 160 30 190 2.6 5183.6
57+45 840 5187.2 5188.9 29D 4.3 120 60 18J 4.8 5189.0
1-25 60+00 770 5193.0 5200.6 975 0.4 110 220 330 0.4 5200.6
6l+8J 770 5198.7 5200.6 29D 1.6 90 200 29D 1.6 5200.6
Notes : 1. Ofstance fran coofluerr:e along chamel reference 11...
2. Io'ean IIOloc;~ in chamel.
3. Fran ehamel refererce 11.. looking _Strlm.
4. Mean velocl~ in fl~.

I'IDL CIIEBC
Fl ood1 ng SalI"Ce l00-)9r Fl"",*>lain Data Fl~ Dota
Fl~ lItdth 3
l00..)9r Thal""9 Flood Fl~
l<lantificatioo StatiO'll D1 sehal'1lE! Elevation Elevatioo Fl"",*>lain Veloci~2 Left Ri!tlt Total 191.4 El.....tioo
(efs) (MSL) (MSl) lItdth (ft) (fps) (feet) (feet) (feet) 1fE!l (MSl)
1<40 9230 !ll54.0 In Bi9 Dry Creek Fl"",*>laln In Bi9 [):y Creek Fl~
10+20 9230 !ll59.0 In Bi9 Illy Creek Fl"",*>laln In Big Illy Creek Fl~
21+95 9230 5062.6 In Big Illy Creek Fl"",*>lain In Big Illy Creek Fl~
30+30 9230 SOOi.8 In B19 Illy Creek Fl"",*>lain 18J 200 m 2.5 !ll78.6
39t<i5 9230 5071.9 In Big Illy Creek Fl"",*>laln 100 18J 28:) 5.3 5079.0
47+25 9230 !ll74.8 !llBO.4 !ill) 5.2 210 210 420 4.9 !llBO.9
51+1:6 9230 !ll76.1 !llBl.8 440 7.5 200 18J m 7.3 !llB2.0
52+95 9230 !ll76.9 !ll85.4 520 8.9 200 18J m 9.5 !ll85.5 .
61<40 9230 !llBl.2 !llBO.l 410 5.4 110 1m 270 5.6 !ll9D.5
70+40 9230 !llB4.5 !ll92.0 470 7.7 8J 320 400 7.1 !ll92.4
Yor\( St. 70+65 9C8l !llB4.8 !ll92.8 420 7.5 90 310 420 7.3 !ll92.8
71+30 9C8l !ll85.5 !ll92.8 370 7.5 90 2&:l 3!ll 7.3 !ll92.8
78+!ll 9C8l 5009.5 !ll97.0 610*" 4.6 2!ll 90 340 5.4 !ll97.4
168th Ave. 83+m 9C8l !ll92.3 5099.0 320'* 10.8 75 135 210 9.8 5099.7
168t11 AIIO. 176+QJ 3030 5161.0 5169.0 ~ 1.2 270 2!ll 520 1.4 5169.0
181<40 3030 5164.0 5169.0 220 6.2 70 70 140 6.9 5169.0
185+75 3030 5169.7 5174.8 28J 4.8 IJ) 95 175 5.0 5175.3
192+55 3030 5175.5 518J.3 240 6.2 70 !ll 120 6.7 518J.6
196<00 3030 5178.5 5183.8 2&:l 4.8 70 8J 1!ll 5.1 5184.2
2a"+70 3030 5186.0 5190.1 330 6.5 185 75 2&:l 6.7 5190.2
205+00 3030 5188.4 5193.1 340 4.6 120 170 29D 4.6 5193.1
l\Jron St. 205+40 3030 5188.6 5194.0 340 5.1 1m 18J 340 5.0 5194.0
205+8J 3030 5189.5 5194.0 2!ll 5.1 11:6 145 2!ll 5.0 5194.0
211+35 3030 5193.2 5199.0 240 6.6 55 75 130 7.1 5199.1
217+25 3030 5198.5 5204.2 270 5.1 8J !ll 130 5.4 5204.6
222+75 2!llD 521:6.5 5209.6 140 8.1 55 15 70 8.8 5209.9
231+65 2!llD 5212.5 5217.3 300 3.6 !ll 120 170 3.8 5217.7
237+10 2!llD 5219.0 5222.8 130 8.5 30 60 90 9.7 5222.8
244+20 2!llD 5227.8 5232.8 200 4.3 40 70 110 5.1 5233.0
24~35 2!llD 5233.0 5237.4 185 6.3 5 95 100 7.2 5237.6
Dim 254+25 1600 5253.7 5253.9 !ill) 3.4 200 140 340 5.4 5254.1
261+00 1600 52!ll.0 5257.1 125 3.0 30 60 90 3.0 5257.6
Notes : 1. Distance fran confluerce along ehamel reference 11...
2. Mean veloci~ fn ehamel.
3. Fran chamel refererce 11.. looking -.streaII.
4. Mean veloci~ In fl~.
* Fl"",*>lain width includes area of hydraulfcally disco...ected flC>l.
** Floodplain width <Des not Include ...... of hydraulically diSCOl.ll!cted flC>l.

*
**

Fl"",*>lain width fncludes area of hydraulically discomect.ed flC>l.
Floodpl.ln width <Des not include area of hycraulically discomected flC>l.