FLOOD04855

• County: Boulder
• Community: Boulder
• Stream Name: South Boulder Creek
• Basin: South Platte
• Title: Flood Hazard Area Delineation
• Date: 7/1/1986
• Prepared For: Boulder County
• Prepared By: UDFCD
• Contract/PO #: &&
• Floodplain - Doc Type: Floodplain Report/Masterplan

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FLOODING SOURCE 100 YR FLOODPLAIN DATA FLOODW4Y DATA 2
/OENT/ F/CAT/ON CROSS STAT/ONt of~ '9z.rFl... THALWEG FLOOO FL 000- FLOOOWAY WIDTH FLOOOWAY
,ECT/OA ~.1~'lGE ELEI/. fm,S,1.1 ELEV. fm.s.!.) PLAIN (FEET) RIGHT (FEET) TOTAL (FEET) ELEV. fm.S./.J
WIDTH7FEETJ LEFT
34370 343+70 5740 5486.0 5491.0 640 190 ~279l 159 ~196l 349 ~475l 5491. 7 (5491.6)
34855 348+55 5740 5490.5 5497.1 735 203 295 92 184 295 479 5497.8 (5497.3)
35240 352+40 5740 5495.8 5501.8 600 56 (l36) 179 (225 ) 235 (361 ) 5502.5 (5502.2)
35995 359+95 5740 5506.4 5513 .3 1195 433 (690) 26 (26 ) 459 (7l6 ) 5514.0 (5513.7)
36580 365+80 5740 5515.4 55l9.7 1100* 410 (585 ) l02 (102) 512 (687) 5520.5 (5520.0)
37160 371 +60 5540 5522.4 5526.6 1280* 366 (522) 85 (85 ) 451 (607 ) 5527.3 (5526.9)
37590 375+90 5540 5526.8 5532.4 1055* 140 (332) 28 (28) l71 (360) 5533.1 (5532.6)
38140 381+40 5540 5534.1 5540.0 1280* 117 (156) 123 (133) 240 (289) 5540.7 (5540.3 )
38720 387+20 5540 5542.2 5547.8 1125* 214 (293) 55 (58) 269 (347) 5548.4 (5548.2)
39575 395+75 5540 5554.0 5559.5 1000* 212 (598) 30 (30) 242 (628) 5560.0 (5559.5 )
39764 397+64 5540 5557.2 5562.6 1085* 140 (504) 120 (l2o) 260 (624 ) 5563.3 (5562.5 )
40130 401+30 5540 5560.3 5567.4 900* 6l (185 ) 42 (61 ) 103 (246) 5568.1 (5567.6)
40960 409+60 5540 5570.4 5578.7 750* 118 (245) 46 (46) 164 (291 ) 5579.5 (5579.0)
41630 416+30 5540 5580.8 5587.0 865* 232 (232) 260 (263) 492 (495) 5587.2 (5587.2)
42370 423+70 5540 5591.6 5596.6 690 393 (518) 28 (28) 421 (546) 5597.3 (5597.0)
Doudy Draw 43005 430+05 5340 5599.1 5605.5 415 46 (73) 91 (Ill ) 137 (184 ) 5606.4 (5605.9 )
43690 436+90 5340 5608.8 5616.l 480 25 (25 ) 210 (285 ) 235 (310) 5616.3 (5616.2)
Fire Access Bridge- 43723 437+23 5340 5609.7 5618.3 460 25 (25 ) 225 (285 ) 250 (310 ) 5618.3 (5618.3 )
City of Boulder 44005 440+05 4800 5614.2 5620.8 320 62 (62) 95 (143 ) 157 (205 ) 562l.4 (5621.1)
Mounta in Parks 44095 440+95 4800 5615.9 5621.9 265 30 (30) 75 (129) 105 (159) 5622.3 (5622.1)
44740 447+40 4800 5627.4 5633.1 495 64 (64 ) 138 (211 ) 202 (275) 5634.0 (5633.6 )
45360 453+60 4800 5635.3 5644.1 755 265 (340) 15 (15 ) 280 (355 ) 5644.3 (5644.0)
46305 463+05 4800 5650.4 5658.2 555 36 (36 ) 236 (293) 272 (329) 5659.1 (5658.6)
46700 467 +00 4800 5658.3 5665.5 360 78 (78 ) 49 (49) 127 (127) 5665.6 (5665.5)
47130 471+30 4800 5665.8 5673.7 220 55 (74) 25 (25 ) 80 (99) 5674.1 (5673.9)
47595 475+95 4800 5674.8 4682.5 325 19 (30) 143 (156) 162 (186) 5683.3 (5682.9)
48040 480+40 4800 5684.4 5692 .1 280 120 (150) 40 (40) 160 (190) 5692.2 (5692.2)
48105 481 +05 4800 5692.0 5695.7 300 135 (185 ) 27 (47) l62 (232) 5696.5 (5696.1 )
48540 485+40 4800 5694.1 5701. 5 260 50 (50) 36 (36) 86 (86) 5701.5 (5701.5 )
Eldorado Sprin9s 48915 489+15 4800 5702.6 5713 .1 175 30 (30) 27 (27) 57 (57) 5713.3 (5713.3)
l ~tatlonlng from mouth (feet).

2 Floodway data in parenthesis () represent floodway based on 0.5 ft rise in Energy Grade Line
for 1 foot rise in EGL- widths relative to channel centerline looking downstream.
* Width includes island area(s) and/or other high ground between outer floodplain boundaries

(EGL)- all other floodway data pertains to encroachment

GREENHORNE and O'MARA, INC.
Engineers . Architec1s . Planners . Surveyors . Photogrommetrists
1325 South CoIorOdo Ba......ard.Suit. 4015' Den"", Colorado 80222' (303) 758-521)0

URBAN DRAINAGE AND FLOOD CONTROL
BOULDER COUNTY

DISTRICT

IOO-YEAR FLOODPLAIN AND FLOODWAY
REFERENCE DATA
SOUTH BOULDER CREEK

T AS L E
4
(ContJ

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