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FLOOD05620
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Last modified
1/25/2010 6:49:44 PM
Creation date
10/5/2006 1:40:53 AM
Metadata
Fields
Template:
Floodplain Documents
County
Boulder
Community
Boulder County
Stream Name
Boulder County Rivers
Basin
South Platte
Title
Floods in Boulder County, Colorado
Date
1/1/1982
Prepared For
Boulder County
Prepared By
Sherry Oaks
Floodplain - Doc Type
Flood Documentation Report
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<br />" <br /> <br />. <br /> <br />This chapter attempts to fill the gap left by the lack of scientific data <br />for the 1894 flood. Little hydrologic work was done in Colorado in 1893 <br />and 1894, which explains the lack of operative gauging stations on the <br />creeks.12 Therefore, an interpretation of the 1894 event must be <br />created by reconstructing human experiences and observations that <br />relate to the magnitude of the flood. <br /> <br />WEATHER <br /> <br />The 1894 event was a result of several meteorologic conditions generally <br />recognized as fundamental to a disasterous flood occurrence; a heavy <br />and constant spring rain at fairly low elevations was stalled against the <br />mountain by an upslope wind condition, contributing to added <br />streamflows in creeks already swollen by snowmelt runoff. The ground <br />was saturated because of days of previous rain. 13 <br /> <br />. <br /> <br />Although there is some debate as to whether the snowmelt runoff during <br />the spring of 1894 was normal or above normal, the meteorologic data <br />carried in government reports concerning the rains that frequented the <br />vicinity in the last few weeks of May were supported by diaries fron <br />citizens in Boulder, Longmont and Salina and from newspaper reports of <br />the time.14 The snowpack was considered less than normal by the <br />United States Weather Service, but heavy rains accelerated the rate of <br />melting. Although the amount of snowpack has been controversial, <br />agreement has been reached concerning the events immediately <br />preceding the flood. The area just east of the Continental Divide above <br />Boulder was pummeled by sixty hours of constant rain from a <br />thunderstorm held against the mountains by a wind blowing from the <br />east. Precipitation amounts recorded at rain gauges neasured 5.00 to <br />8.54 inches during that period. The storm hovered near the upper <br />portions of St. Vrain, Lefthand and Boulder (and probably South <br />Boulder) Creek basins, forcing those waterways and their tributaries to <br />reach flood stage during the night and early morning hours of May 31, <br />1894.15 <br /> <br />ST. VRAIN CREEI( BASIN DMMGES <br /> <br />North, ,1v1iddlc and South St. Vrain Creeks were sparsely populilted in <br />1894, and as a result data for the areas upstream of Lyons are scarce. <br />The ,toll roads from Lyons to Estes Park and from Lyons to Long Gulch <br />were pronounced disasters and, like many roads in the County, it took <br />over six weeks of repair to make them passable.16 <br /> <br />Lyons <br /> <br />. <br /> <br />Lyons, at least the lower part at the confluence of Middle and North <br />St. Vrain Creeks, was covered by a lake some three miles long, which <br />stretched alrnost as far as Longmont, according to Sheriff Dyer. 17 <br />Nearly twenty houses and businesses were destroyed by the rush of the <br />floodwaters and the town lost its water works system, bridges and <br />picnic grounds at Meadow Park. Just as north and south Boulder were <br />
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