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Last modified
11/23/2009 12:58:13 PM
Creation date
10/4/2006 10:09:08 PM
Metadata
Fields
Template:
Floodplain Documents
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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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />August 1913 - Flooding damaged or destroyed most of the houses along <br />James Creek. All wagon and footbridges were destroyed. The road to <br />Jamestown was out for two weeks. <br /> <br />3 August 1951 - During the afternoon and night of 3 August, a heavy <br />rainstorm occurred over the front range and foothills east of the <br />Continental Divide from the vicinity of Boulder to near Fort Collins, <br />Colorado, a distance of approximately 50 miles. One of the storm centers <br />was in the Lefthand Creek Basin near the town of Niwot, Colorado. At <br />this storm center, total precipitation was unofficially reported to have <br />been over six inches. The runoff from this storm caused flooding on St. <br />Vrain Creek and on its tributaries, Dry Creek and Lefthand Creek. <br />Overbank flows occurred along most of the length of Lefthand Creek. <br />Bridges, roads, crops, and irrigation structures were damaged. <br /> <br />2 - 6 June 1921 - This storm produced general rains over the South <br />Platte River Basin with the greatest amounts along the foothills. The <br />storm covered an area of approximately 520 square miles and lasted five <br />days. The maximum recorded rainfall was 5.29 inches and the greatest <br />recorded rainfall intensity was 4.3 inches in six hours at Longmont. <br />This flood was produced by a combination of rainfall and snowmelt. <br />Although this storm caused overbank flooding, neither discharges nor <br />damages were recorded. <br /> <br />3 September 1938 - During this storm, showers were general over the <br />Lefthand Creek 8asin accompanied by isolated cloudbursts along the <br />foothills and the lower elevations. A maximum peak discharge of 812 <br />cubic feet per second (c.f.s.l was recorded in Lefthand Creek at the U.S. <br />Highway 287 gaging station near Longmont, Colorado. This gaging station <br />was not in operation during the 1949 and 1951 floods. <br /> <br />May 1969 - Three days of heavy snow and rain along with spring <br />runoff caused a flood which damaged houses and businesses in Jamestown <br />and caused major erosion damage to roads and bridges along James Creek. <br />A spot peak discharge measurement on James Creek of 1,970 c.f.s. was made <br />by the U.S. Geological Survey at a point just upstream of the mouth of <br />James Creek. Precipitation totals of approximately eight inches were <br />recorded in the James Creek Basin. <br /> <br />4 June 1949 - On 4 June 1949, Lefthand Creek had overbank flooding <br />as a result of heavy and prolonged rainfall during late May and early <br />June and the runoff from an unusually heavy snow blanket. The prolonged <br />high flow on Lefthand Creek caused minor damages to irrigation headworks, <br />bridges, and farmlands. The gaging station near Boulder, Colorado <br />recorded a peak discharge of 1,140 cubic feet per second during the flood <br />period. <br /> <br />5 May 1973 - Rainfall amounts ranging to as much as six inches fell <br />on the plains east of the Rocky Mountains beginning on 5 May. The <br />Lefthand Creek basin received amounts ranging from two to three inches. <br />Runoff from this general storm contributed to considerable flooding on <br />the South Platte River. <br /> <br />6 <br />
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