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
IOENTlFI CATION FLOOD ELEV. (MSL)
SECTION (CFS) ELEV. (MSL) WIDTH (FT) LEFT (H) RIGHT (FT) TOTAL (FT) ELEV. (MSLl
32 503+85 12,650 5002.4 5010.9 2260 + 1020 60 1080 5011.1
109th Street 34 505+2$ 12,650 5002.9 5012.1 2220 960 90 1050 5012.3
35 511+35 12,650 5005.2 5013.5 2180 730 170 900 5014.1
36 517+60 12,700 5007.9 5015.4 2560 540 110 660 5016.0
U.S. Highway 287 38 519+70 12,700 5008.8 5018.0 2785 + 470 280 750 5018.6
39 526+80 12,700 5011. 3 5019.3 1500 II 400 550 950 5020. 2
Bullhead Gulch 40 530+70 12,700 5012.8 5020.5 1700 350 700 1050 5021.4
41 539+55 12,700 5015.9 5023.5 2200 265 1185 1450 5024.0
42 547+45 12,750 5021. 5 5027.1 2140 450 950 1400 5027.7
43 556+20 12,750 5024 .1 5030.8 2100 590 760 1350 5031. 4
44 565+60 12,750 5027.0 5033.7 2280 710 790 1500 5033.9
45 572+20 12,850 5029.9 5036.6 2310 630 670 1300 5037.0
46 579+85 12,850 5033.2 5039 .3 2100 905 45 1050 5039.9
47 585+40 12,850 5034.5 5041. 0 1790 690 310 1000 5041. 7
48 591+80 12,950 5036.2 5043.1 2375 680 70 750 5044.0
49 595+50 12,950 5037.7 5044.7 2510 * 730 170 900 5045.6
50 599+60 13,050 5039.2 5046.1 2465 940 60 1000 5047.0
51 607+00 13,050 5042.3 5048.4 1735 1065 60 1125 5049.3
52 616+50 13 ,150 5043.5 5050.2 2340 1800 29 1829 5051. 0
53 623+00 13,150 5046.5 5052.5 2110 * 1380 18 1398 5053.3
North 95th Street 55 624+80 13 ,150 5049.8 5055.2 2650 1343 40 1383 5056.1
56 628+00 13,150 5050.2 5055.7 2440 * 1270 38 1308 5056.5
57 631+00 13 ,150 5051. 2 5056.5 2400 * 1280 43 1323 5057.3
58 633+40 13 ,150 5052.2 5057.7 2240 * 1400 35 1435 5058 . 5
59 637+60 13 ,150 5053.0 5058.9 2060 1460 50 1510 5059.6
60 644+00 13,250 5055.4 5060.7 1820 * 1080 100 1180 5061.4
61 649+30 13,250 5055.9 5063.0 1310 945 25 970 5063.7
62 655+60 13,350 5057.4 5065 . 5 1580 730 320 1050 5065.9
Dry Creek 63 661+60 12,900 5059.4 5067.1 mg 880 220 1100 5067.5
64 669+60 13 000 5061. 5 5068.9 485 565 1050 5069.3

;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
# Width does not include floodplain area east of U.S. Hwy.287
+ Cross Section does not extend to high ground

Hydrology and Hydraulics completed
by Omaha Distric~ Corps of Engineers.

MULLER ENGINEERING COMPANY, INC.
CONSULTING ENGINEERS
1410 VANCE ST.. SUITE 203
LAKEWOOD. COWRADO 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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CONT,

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