FLOOD00987

• Designation Number: 186
• County: Boulder
• Community: Longmont
• Stream Name: Lefthand Creek
• Title: Floodplain Information Report - Lefthand Creek, Volume I: Mouth to Foothills Highway, Boulder County and Longmont
• Date: 12/1/1981
• Designation Date: 4/1/1982
• Floodplain - Doc Type: Floodplain Report/Masterplan

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TABLE 7 (Continued)
FLOOD FREQUENCY-ELEVATION AND DISCHARGE DATA
Lefthand Creek Boulder County, Colorado
Distance StreamU. 10-Year 50-Year 100-Year 500-Year
Reference From Bed Flood Peak 21 Flood Peak 2 Flood Peak 2 Flood Peak 2
Point Mouth Elevation Elevation Discharge--'- Elevation Discharg~ Elevation Discharg~ Elevation Discharge....L
Number Ft. Identification Ft.-m.s.l. Ft.-m.s.l. c.f. s. Ft. -m. 5 .1. c.f.s. Ft.-m.s.l. c.f.s. Ft.-m.s.l. c.f.s.
98 461+90 5191.7 5195.0 5198.0 5200.6 5202.6
98.1 462+ 75 5192.9 5196.5 5199.8 5201.8 5203.7
99 463+05 Pri vate Drive 5195.0 dls 5196.5 dls 5199.8 dls 5201. 8 dls 5203.7
u/s 5201. 8 u/s 5203.5 u/s 5204.3 u/s 5205.7
100 463+80 5195.0 5201. 8 5203.5 5204.3 5205.7
101 467+10 5199. 1 5203.2 5205.5 5207.1 5208.5
102 473+80 5208.3 5211.4 5215.4 5216.9 5218.2
103 480+00 5216.8 5220.0 5221.7 5222.6 5223.6
104 485+35 5223.1 5226.4 5228.5 5228.9 5229.7
106 488+ 70 5225.2 5229.9 860 5233.0 3800 5233.9 6600 5234.9 14590
106.1 491+80 5228.7 5233.0 5236.5 5237.3 5238.3
107 492+30 Ford 5232.0 dls 5233.0 dls 5236.5 dls 5237.3 dls 5238.3
u/s 5235.2 u/s 5238.4 u/s 5240.5 u/s 5244. 0
107.3 493+10 5230.1 5235.2 5238.4 5240.5 5244.0
108 497+35 5235.0 5238.8 5242.2 5244.5 5248.8
109 497+80 Diversion Structure 5240.5 dls 5238.8 dls 5242.2 dls 5244.5 dls 5248.8
u/s 5244 . 7 u/s 5249.0 u/s 5249.8 u/s 5250.9
109.1 498+00 5238.3 5244.7 5249.0 5249.8 5250.9
110 498+75 5239.8 5244.8 5249.0 5249.8 5251. 0
111 507+15 5249. 1 5252.3 5255.3 5257.5 5258.8
II Low water elevation as determined by aerial photogrammetric methods.
2T Discharges are prorated between stations.

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