FLOOD01611

• County: Boulder
• Community: Boulder County
• Stream Name: Upper Lefthand Creek-Foothills Hwy to Peak to Peak
• Title: Flood Information Report
• Date: 8/1/1983
• Prepared For: Boulder County
• Prepared By: UDFCD
• Floodplain - Doc Type: Floodplain Report/Masterplan

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Reference
Point
Number

173
174
175

176
177
178
179
180
180.1
182

181
183
184
185

TABLE 6 (Continued)

FLOOD FREQUENCY-ELEVATION AND DISCHARGE DATA
Upper Lefthand Creek Boulder County, Colorado

Distance
From
Mouth
Ft.

Stream 1/
Bed -
El eva ti on
Ft.-m.s.l.

10-Year
Peak Flood
Discharge 2/ Elevation
c.f.s. - Ft.-m.s.l.

50-Year
Peak Flood
Discharge 2/ Elevation
c.f.s. - Ft.-m.s.l.

100-Year
Peak Flood
Discharge 2/ Elevation
c.f.s. - Ft.-m.s.l.

500-Year
Peak
Di scharge 21
c.f.s. -

Fl ood
Elevation
Ft.-m.s.l.

Identification

831+53 5839.2 5850.9 5852.9 5854.1 5856.9
839+73 5864.6 5868.2 5871. 7 5873.8 5877 . 0
843+73 5871.3 5875.4 5878.7 5880.8 5885.8
847+30 Six Mile d/s 900 3180 5370 12560
Canyon u/s 830 2850 4940 11630
849+37 5889.1 5891. 4 5893.1 5894.4 5896.9
856+30 5913.0 5916.4 5919.0 5921.1 5925.9
862+18 5944.3 5948.8 5952.9 5955.8 5963.6
866+88 5972.4 5976.9 5980.8 5984.2 5988.1
873+98 5997.4 6000.7 6003.5 6004.7 6008.7
877+65 6009.2 6011. 9 6014.5 6016.3 6020.8
878+20 Lefthand 6010.2 d/s 6011. 9 6014.5 6016.3 6020.8
Canyon Dri ve u/s 6025.7 6027.7 6029.1 6032.1
878+69 6011.1 6025.7 6027.7 6029.1 6032.1
884+03 6026.6 6029.7 6032.6 6035.0 6040.1
891 +68 6049.1 6052.6 6055.4 6057.5 6063.1
895+05 6058.2 6061. 4 6064.6 6066.8 6071. 5
Jj Low water elevation as determined by aerial photogrammetric methods.
~ Discharges are prorated between stations.

14