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<br /> TABLE 6
<br /> FLOOD FREQUENCY - ELEVATION AND DISCHARGE DATA
<br /> NORTH ST. VRAIN AND ST. VRAIN CREEK, BOULDER COUNTY, COLORADO
<br /> 10-Year Flood 50-Year Flood 100-Year Flood 500-Year Flood
<br />Ref. Station Location Stream Bed Crest Peak Crest Peak Crest Peak Crest Peak
<br />Section from Mouth Elevation Elev. Discharge Elev. Discharge Elev. Discharge Elev. Discharge
<br />Number (feet) (Ft. MSL) (Ft. MSL) (cfs) (Ft. MSL) (cfs) (Ft. MSL) (cfs) (Ft. MSL) (cfs)
<br />126 1662+55 U,S. Highway 36 5254,20 5259.30 2320 5263.09 5894 5265.68 9050 5269,17 20112
<br />128 1 669+55 5264,60 5268.04 2320 5269,37 5894 5270.03 9050 5274,80 20112
<br />130 1672+75 5265.40 5270.09 2250 5271.84 5811 5272,70 9010 5275,33 20148
<br />132 1673+75 5268,10 5271,15 2250 5273.30 5811 5274,01 9010 5276,04 20148
<br />134 1682+55 5270,30 5275,84 2250 5277 .45 5811 5278.46 9010 5280,70 20148
<br />136 1693+95 5277.60 5282.41 2250 5284.49 5811 5286,89 9010 5289,32 20148
<br />138 1697+35 5283.20 5286.75 2250 5289.52 5811 5291 .45 9010 5293,34 20148
<br />140 1698+25 5288.00 5290,39 2180 5292.43 5728 5293.16 8960 5294,68 20184
<br />144 1702+35 5290,00 5294,28 2180 5296.57 5728 5297,63 8960 5299.01 20184
<br />146 1709+05 5294.00 5298.11 2180 5300,28 5728 5301,27 8960 5304,14 20184
<br />148 1713+25 5295.00 5300,29 2180 5303.41 5728 5304,74 8960 5306,11 20184
<br />150 1714+55 5297,00 5301.88 2110 5304.48 5645 5305.52 8920 5308. 12 20220
<br />152 1719+30 5302,50 5306.04 2110 5307,39 5645 5308.53 8920 5310,92 20220
<br />152.8 1 723+30 5304.80 5309.43 2110 5312.05 5645 5313.36 8920 5316,50 20220
<br />152,9 1 723+56 Pedestrian Bridge
<br />153 1723+60 5305,00 5310.98 2110 5313.99 5645 5315.88 8920 5319,38 20220
<br />153,3 1724+15 5306,08 5311.02 2110 5313.84 5645 5316.00 8920 5319,35 20220
<br />153,5 1727+20 5307.40 5312.62 2110 5315,20 5645 5316,69 8920 5319,61 20220
<br />154 1728+50 5308,50 5312.97 2110 5315.54 5645 5317,38 8920 5319.60 20220
<br />155.5 1729+10 Second Avenue Bridge
<br />157 1729+30 5308,50 5312.97 2110 5315.56 5645 5317.39 8920 5320.76 20220
<br />159 1732+20 Confluence 5312,30 5315,93 2040 5318.41 5570 5320.13 8880 5322.16 20260
<br />159,5 1738+70 5319,00 5322,75 1000 5324.91 2850 5326.00 4310 5328.40 10630
<br />160 1744+70 5323,30 5326.71 1000 5330.04 2850 5330.76 4310 5332.40 10630
<br />162 1748+30 5327,30 5330.42 1000 5332.40 2850 5334.52 4310 5337.45 10630
<br />163 1749+55 5328.50 5331,61 1000 5335.04 2850 5335,77 4310 5340,75 10630
<br />163,5 1750+05 State Highway 7
<br />164 1750+15 5328.50 5331.93 1000 5335.41 2850 5336.61 4310 5340,83 10630
<br />166 1758+50 5337.00 5340.04 1000 5342.28 2850 5343,57 4310 5348,14 10630
<br />168 1768+00 5348,20 5351,70 1000 5354,97 2850 5356.04 4310 5358,99 10630
<br />170 1776+00 5357.20 5360.55 984 5363.50 2800 5364,59 4240 5367,17 10451
<br />172 1783+90 5362,90 5366,65 984 5368.81 2800 5369.96 4240 5372,87 10451
<br />174 1784+45 5363.70 5367.19 984 5370.19 2800 5371,65 4240 5372,98 10451
<br />176 1785+10 5364,50 5367,31 984 5370,28 2800 5371.67 4240 5373,32 10451
<br />176,5 1786+30 U,S. Highway 36
<br />177 1786+40 5364.50 5368.09 984 5371.30 2800 5373,97 4240 5377.56 10451
<br />178 1787+80 5365.90 5368.89 984 5371.46 2800 5374,04 4240 5377.69 10451
<br />180 1794+90 5372,00 5375.14 965 5377.32 2750 5378,25 4170 5379,91 10273
<br />182 1 805+30 5382,20 5384.18 965 5385,93 2750 5387,06 4170 5388.58 1 0273
<br />185 1810+60 5387,50 5389.88 965 5391.31 2750 5392.49 4170 5396,06 10273
<br />185,5 1811+23 U.S. Highway 36
<br />186 1811 +43 5387,50 5390.82 965 5393,60 2750 5395,52 4170 5405.32 10273
<br />190 1821 +08 5396.00 5398.49 946 5400.42 2700 5400,78 4090 5405.46 10095
<br />192 1 830+03 5404,30 5407.68 946 5410.00 2700 5410,92 4090 5412.15 10095
<br />196 1831+33 5406,00 5409.33 946 5411 .27 2700 5411.86 4090 5413.46 10095
<br />198 1837+33 5412,00 5415.13 946 5418.33 2700 5419.42 4090 5420.88 10095
<br />R:135600IFLOODPLAI NIT ABLE5,XLS 6/15/9810:09 AM
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