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

I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I

TABLE 6 (Continued)

FLOOO 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 Flood Peak
Point Mouth El evati on Elevation Discharge ~ Elevation Discharge ~ Elevation Discharge ~ Elevation Discharge 2/
Number Ft. Identification Ft.-m.s.]. Ft.-m.s.l. c.f.s. Ft.-m.s.]. c. f.s. Ft.-m.s.l. c.f.s. Ft.-m.s.l. c.f.s.
288.3 1147+60 6971.5 6975.8 6978.6 6979.6 6982.7
289 1149+89 6978.2 6981.1 6984.5 6986.2 6989.7
290 1154+78 7003.4 7005.4 7007.3 7008.3 7011.0
291 1157+84 7016.7 7019.7 7022.8 7025.7 7028.5
291.1 1158+00 Lefthand 7017.2 d/s 7019.7 7022.8 7025.7 7028.5
Canyon Dri ve u/s 7022.4 7027.8 7028.8 7031.4
292 1158+20 7017.7 7022.4 7027.8 7028.8 7031.4
293 1163+18 7037.0 7040.0 7042.5 7044.9 7049.9
294 1169+24 7069.1 7071.3 7074.2 7075.6 7079.4
295 1173+11 7087.7 7090.8 7093.2 7094.7 7098.0
296 1177+57 7104.4 7107.4 7109.8 7110.8 7113.1
297 1182+68 7125.1 7128.0 7131.0 7132.9 7137.0
298 1187+51 7149.1 7151.2 7153.2 7154.1 7157.6
298.1 1188+88 7154.0 7156.9 7159.5 7161.0 7164.5
299 1189+20 Lefthand 7156 .0 d/s 7156.9 7159.5 7161.0 7164.5
Canyon Dri ve u/s 7161.2 7169.3 7170.4 7173.8
299.1 1189+58 7158.0 7161.2 7169. 3 7170.4 7173.8
l! Low water elevation as determined by aerial photogrammetric methods.
~ Discharges are prorated between stations.

20