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
IOENTIFI CATION SECTION (CFS) ELEV. (MSL) FLOOD ELEV. (MSL) WIDTH (FT) ELEV. (MSL)
LEFT (FT) RIGHT (FT) TOTAL (FT)
Downstream Study Limi
Boulder-Weld Cty.Line B-41 327+00 13,750 4942.2 4948.6 1550 . 830 170 1000 4949.1
B-42 337+60 13 ,850 4942.9 4951. 9 2000 . 770 330 1100 49;;2.2
2 341 +50 13,850 4945.6 4952.8 1540 *. 230 304 534 4953.5
State Highway 52 4 342+82 13,850 4945.5 4957.8 2060 +. 160 440 600 4958.1
5 349+80 13,900 4948.5 4958.0 2210 +. 630 470 1100 4958.7
6 355+30 13,950 4948.7 4958.4 2970 * 835 215 1050 4959.2
Coal Creek 7 362+40 14,000 4951. 3 4959.5 2300 840 110 950 4960.5
8 367+70 12,200 4953.3 4961. 5 3020 775 375 1150 4962.3
9 377+80 12,200 4957.0 4964.9 3520 580 170 750 4965.2
10 385+50 12,300 4959.0 4968.6 3490 * 770 225 995 4969.0
11 390+95 12,300 4960.2 4970.1 3690 * 1055 120 1175 4970.7
12 396+20 12,300 4961. 8 4971.1 3030 * 990 88 1078 4971. 8
Access Drive 13 402+90 12,300 4963.5 4973.6 3690 * 690 510 1200 4974.3
14 409+75 12,300 4965.6 4975.6 3620 II 360 910 1270 4976.2
15 415+30 12,300 4968.2 4977 .6 3500 * 300 985 1285 4978.4
16 423+40 12,400 4972.0 4980.2 3250 * 330 870 1200 4980.4
17 430+70 12,400 4977 . 3 4983.2 3600 350 950 1300 4983.5
18 440+20 12,400 4979.2 4986.8 3950 350 950 1300 4987.2
19 446+75 12,400 4982.2 4989.5 3540 250 1000 1250 4989.6
Kenosha Road 21 450+15 12,400 4982.9 4990.7 3250 165 1085 1250 4991.0
22 455+35 12,400 4984.7 4991.5 3210 * 260 1140 1400 4992 .4
23 461+00 12,450 4986.8 4993.2 3250 400 900 1300 4993.8
24 467+20 12,450 4989.7 4997.2 2870 750 740 1490 4998.1
25 472+50 12,500 4991. 7 4999.9 2875 760 570 1330 5000.7
26 477+40 12,500 4993.4 5001. 2 3010 850 300 1150 5002.0
27 481+40 12,500 4994.3 5003.4 3875 * 950 80 1030 5003.4
28 485+40 12,500 4996.6 5005.2 4230 * 1020 50 1070 5005.1
29 489+80 12,500 4997.6 5006.0 3875 * 1000 63 1063 5006.5
30 494+70 12,600 4999.4 5006.8 2780 * 1040 59 1099 5007.5
31 499+50 12,600 5001.1 5008.4 2290 * 1030 70 1100 5008.9

1Distance in feet above mouth
2From center of channel looking downstream
* Width includes island area(s) and/or other high ground between floodplain boundaries
# Width does not include backwater area south of Kenosha Road
+ Cross Section does not extend to high ground
. Width represents Boulder County limits only, actual width extends into Weld County

Hydrology and Hydraulics completed
by Omaha District Corps of Engineers.

MULLER ENGINEERING COMPANY, INC.
CONSULTING ENGINEERS
1410 VANCE ST., SUITE 203
LAKEWOOD. COLORAOO 80215
[phone]

URBAN DRAINAGE AND FLOOD CONTROL DISTRICT

COLORADO WATER CONSERVATION BOARD
BOULDER COUNTY

IOO-YEAR FLOODPLAIN AND FLOODWAY
REFERENCE DATA
LOWER BOULDER CREEK

TABLE
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