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 1.1 10-Year 50-Year 100-Year 500-Year
Reference From Bed Flood Peak Flood Peak Flood Peak Flood Peak
Point Mouth Elevation Elevation Discharge 11 Elevation Discharge 11 Elevation Discharge 11 Elevation Discharge 11
Number Ft. Identification Ft.-m.s.l. Ft.-m. s.l. c.f.s. Ft.-m.s.1. c.f.s. Ft.-m.s.l. c. f.s. Ft.-m.s.l. c.f.s.
300 1190+60 7161.6 7164.3 7169.5 7170.7 7174.2
301 1196+32 7187.3 7189.9 7191.9 7193.0 7196.0
302 1197+52 7192.5 7194.8 7197.1 7198.4 7201.6
303 1201+84 7216.4 7219.2 7222.0 7223.1 7226.7
304 1207+69 7245.5 7248.8 7251. 6 7253.5 7259.6
305 1213+14 7284.9 7287.2 7290.2 7292.0 7296.8
306 1218+97 7322.4 7325.4 7328.6 7330.9 7336.2
307 1224+10 7349.6 7352.4 7355.3 7356.6 7360.6
308 1231+08 7378.6 7381.1 7383.4 7385.0 7389.6
309 1235+08 7397.6 7400.1 7403.3 7405.3 7411.1
310 1240+31 7416.5 7419.4 7422.4 7424.0 7428.9
311 1246+68 7454.3 7456.9 7460.5 7462.6 7466.1
311.1 1246+92 7456.0 7458.6 7462.2 7464.3 7467.8
312 1247+10 Private Drive 7456.5 d/s 7458.6 7462.2 7464.3 7467.8
u/s 7464.3 7466.7 7467.6 7471.6
312.1 1247+29 7457.2 7464.3 7466.2 7467.6 7471.6
313 1251+59 7469.2 7472.0 7475.3 7477.5 7482.4
1.1 Low water elevation as determined by aerial photogrammetric methods.
11 Discharges are prorated between stations.

21