FLOOD10171

• Designation Number: 218
• County: Boulder
• Community: Unincorporated Boulder County
• Stream Name: Lower Boulder Creek
• Basin: South Platte
• Title: Flood Hazard Area Delineation - Lower Boulder Creek - Valley View Road to Boulder Weld County Line
• Date: 3/1/1983
• Designation Date: 7/1/1983
• Floodplain - Doc Type: Floodplain Report/Masterplan

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FLOODING SOURCE IOO-YEAR FLOODPLAIN DATA FLOODWAY DATA
CROSS STATION I IOOyr. DISCHARGE THALWEG FLOODPLAIN FLOODWAY WIDTH 2 FLOODWAY
IDENTIFICATION FLOOD ELEV. (MSL)
SECTION (CFs) ELEV.(MSl) WIDTH 1FT) LEFT (FT) RIGHT (FT) TOTAL (FT) ELEV.. (MSL)
65 682+40 13,000 5064.7 5071. 6 2450 * 450 500 950 5071. 9
66 685+30 13,100 5065.2 5072.5 2390 420 530 950 5073.0
67 689+70 13,100 5066.3 5073.8 2820 * 320 780 1100 5074.4
68 695+00 13,100 5068.2 5074.8 2830 * 550 700 1250 5075.5
69 698+40 13 , 100 5070.3 5076. 1 2895 660 715 1375 5077 . 1
70 714+50 13,200 5072.7 5081.4 3125 100 1250 1350 5080.5
71 719+25 13,200 5075.9 5082.4 2990 120 990 1100 5082.3
72 724+80 13,300 5077 .5 5083.7 2800 100 1000 1100 5084.7
73 730+70 13,300 5078.9 5086.8 2940 130 1020 1150 5087.3
74 738+10 13,300 5081. 0 5088.4 2450 520 630 1150 5089.2
75 747+90 13 ,450 5084.2 5089.4 3000 30 1368 1398 5090.4
76 755+00 13 ,450 5085.9 5091. 9 2910 * 100 1025 1125 5092.4
77 760+30 13 , 600 5087..5 5094.1 2850 270 780 1050 5094.7
78 766+40 13,600 5089.5 5096.0 3320 * 65 1035 1100 5096.4
79 771+80 13,600 5091. 7 5098.7 3310 * 150 810 960 5099.2
Private Drive 81 776+20 13,600 5094.2 5100.7 1590 110 770 880 5101. 7
82 782+80 13,600 5096.3 5103.2 1665 310 650 960 5104.2
83 790+50 13,700 5098.9 5105.7 1470 90 810 900 5106.5
84 794+40 13,700 5100.8 5107.4 1620 150 710 860 5108.2
85 799+15 13,700 5102.3 5109.1 1610 90 800 890 5110.0
86 803+05 13,800 5104.6 5111.5 2170 105 970 1075 5112.3
North 75th Street 88 805+60 13,800 5105.0 5113.3 2020 82 1000 1082 5113.7
89 810+80 13,800 5108.4 5114.8 2130 110 840 950 5115.3
90 816+40 13 , 900 5110.1 5117.0 2260 285 585 870 5117.8
91 822+30 13 , 900 5112.1 5119.4 1890 * 220 510 730 5120.1
92 827+20 13,900 5112.6 5121.7' 3990 * 85 581 661 5122.2
93 833+10 14,000 5115.8 5123.7 4100 * 80 600 680 5124.6
94 839+85 14,000 5118.0 5126.8 3985 "- 100 619 719 5127.1
95 845+60 14,000 5120.5 5128.8 3780 * 70 520 590 5129.8
Access Drive 96 850+30 14,100 5121.8 5132.6 3880 * 15 485 500 5133.1

;Distance in feet above mouth
From center of channel looking downstream
* Width includes island area(s) and/or other high ground between outer floodplain boundaries

Hydrology and Hydraulics completed
by Omaha District Corps of Engineers.

MULLER ENGINEERING COMPANY, INC.
CONSULTING ENGINEERS
1410 VANCE Sf., SUITE:103
u.J<EWOOD. COI..ORADO lI021S
[phone]

URBAN DRAINAGE AND FLOOD CONTROL DISTRICT

COLORADO WATER CONSERVATION BOARD
BOULDER COUNTY

IOO-YEAR FLOODPLAIN AND FLOODWAY
REFERENCE OATA
LOWER BOULDER CREEK

TABLE
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CONT.

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