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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TABLE 6 (Continued)

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

Distance Stream Y 10-Year 50-Year 100-Year 500-Year
Reference From Bed Flood Peak Flood Peak Flood Peak Flood Peak
Point Mouth Elevation Elevation Discharge 2/ Elevation Discharge 2/ El evati on Discharge 2/ Elevation Di scharge y
Number Ft. Identification Ft.-m.s.l. Ft.-m.s.l. c.f.s. - Ft.-m.s.l. c.f.s. Ft.-m.s.l. c.f.s. - Ft.-m.s.l. c. f.s.
268.1 1081 +58 6690.2 6693.3 6698.0 6700.7 6707.1
269 1081+78 Private Drive 6690.7 d/s 6693.3 6698.0 6700.7 6707.1
u/s 6696.2 6703.7 6705.2 6709.6
270 1081+98 6692.8 6696.2 6703.7 6705.2 6709.6
271 1086+28 6719.6 6722.4 6726.2 6729.4 6733.1
272 1086+48 Private Drive 6721.0 d/s 6722.4 6726.2 6729.4 6733.1
u/s 6726.2 6730.5 6732.7 6736.3
272.1 1086+68 6722.8 6726.2 6730.5 6732.7 6736.3
273 1088+47 6734.8 6737.6 6741. 3 6742.8 6746.7
274 1093+43 6755.0 6758.3 6761.3 6763.3 6766.7
275 1096+81 6764.3 6766.8 6769.9 6771.2 6775.3
276 1099+79 6780.6 6782.8 6784.2 6785.0 6787.3
278 1100+86 6783.6 6786.5 6789.1 6791.4 6794.6
279 1107+05 6803.4 6806.2 6808.1 6808.7 6811. 5
279.1 1109+60 6813.2 6816.0 6817.5 6818.2 6820.2
280 1110+10 Lefthand 6816.0 d/s 6816.0 6817.5 6818.2 6820.2
Canyon Dri ve u/s 6823.6 6825.3 6826.4 6829.7
1/ Low water elevation as determined by aerial photogrammetric methods.
y Discharges are prorated between stations.

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