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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.BO 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+9S 5277.60 5282.41 2250 5284.49 5811 5286.89 9010 5289.32 20148 <br />138 1697+35 5283.20 52B6.75 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 201B4 <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 B960 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 B920 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 2BOO 5373.97 4240 5377.56 10451 <br />178 1787 +BO 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 53B4.18 965 5385.93 2750 5387.06 4170 5388.58 1 0273 <br />185 1810+60 5387.50 53B9.B8 965 5391.31 2750 5392.49 4170 5396.06 10273 <br />185.5 1811+23 U.S. Highway 36 <br />186 1 Bl1 +43 5387.50 5390.82 965 5393.60 2750 5395.52 4170 5405.32 10273 <br />190 1821 +08 5396.00 539B.49 946 5400.42 2700 5400.78 4090 5405.46 10095 <br />192 1 B30+03 5404.30 5407.68 946 5410.00 2700 5410.92 4090 5412.15 10095 <br />196 1B31+33 5406.00 5409.33 946 5411 .27 2700 5411.86 4090 5413.46 10095 <br />198 1B37+33 5412.00 5415.13 946 541B.33 2700 5419.42 4090 5420.88 10095 <br />R:135600IFLOODPLAI NIT ABLE5.XLS 6/15/9810:09 AM <br />