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

Di stance Stream 1/ 10-Year 50-Year 100-Year 500-Year
Reference From Bed Flood Peak Flood Peak Flood Peak Fl ood Peak
Point Mouth Elevation Elevation Discharge y Elevation Discharge Y Elevation Discharge 2/ Elevation Discharge Y
Number Ft. Identification Ft.-m.s.l. Ft.-m.s.l. c.f.s. Ft. -m. s.J. c. f.s. Ft.-m.s.l. c.f.s. Ft.-m.s.l. c.f.s.
280.1 1110+60 6819.0 6823.6 6825.3 6826.4 6829.7
281 1111 +25 6821. 8 6824.2 6826.2 6827.4 6831. 0
1112+50 Glendale Gulch d/s 420 1990 3490 9910
u/s 420 1960 3450 9800
282 1114+91 6835.2 6837.6 6840.5 6842.3 6846.3
283 1121 +31 6867.6 6870.6 6873.9 6876.2 6882.5
284 1127+89 6894.0 6896.5 6898.5 6899.7 6903.5
285 1130+39 6902.9 6905.3 6907.4 6908.7 6912.1
286 1136+51 6925.1 6928.0 6931. 0 6932.6 6936.6
286.1 1145+20 6962.0 6965.6 6968.8 6969.6 6972.3
287 1145+35 Private Drive 6962.5 d/s 6965.6 6968.8 6969.6 6972.3
u/s 6966.9 6972.2 6973.2 6976.1
287.1 1145+50 6963.0 6966.9 6972.2 6973.2 6976.1
288 1146+07 6965.0 6969.0 6972.4 6973.4 6976.3
288.1 1147+27 6970.8 6974.3 6977.6 6978.5 6981.1
288.2 1147+42 Private Drive 6971.0 d/s 6974.3 6977 . 6 6978.5 6981.1
u/s 6975.8 6978.6 6979.6 6982.7
11 Low water elevation as determined by aerial photogrammetri c methods.
Y Discharges are prorated between stations.

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