Laserfiche WebLink
<br />rr - I <br /> <br /> <br />SECTION II <br /> <br />STUDY AREA <br /> <br />The study area, shown on Figure I, for this report consists of <br />South Boulder Creek and its tributaries including Marshall Gulch. This <br />basin passes by the southern and eastern edges of the City of Boulder. <br />The topographic mapping supplied for the study extends from the town of <br />Eldorado Springs to the Colorado and Southern Railroad east of Boulder. <br />The drainage basin for South Boulder Creek originates at the Continental <br />Divide. The upper portion of a basin is characterized by steep rocky <br />slopes changing to heavily wooded slopes at lower elevations. <br /> <br />i <br /> <br />Runoff in the upper portion of the basin is controlled by Gross <br />Reservoir which is owned by the Denver Water Department. Flows in <br />South Boulder Creek have been regulated by this 43,060 acre-foot reg- <br />ulating reservoir since May I, 1955. The drainage area above Gross <br />Reservoir is 92 square miles. The U. S. Geological Survey has a stream <br />gaging station located near Eldorado Springs downstream from the reservoir. <br />The total drainage area above this gage is 109 square miles. The drainage <br />area between the Eldorado Springs gage and the confluence with Boulder <br />Creek is 23 square miles. The total basin size is 132 square miles. <br /> <br />The drainage area between Gross Reservoir and Eldorado Springs <br />is comparable in character to a large portion of that above Gross Reservoir. <br />East of Eldorado Springs the Basin flattens considerably into the prairie <br />areas along the foothills of the Rocky Mountains. <br /> <br />Since the basin west of Eldorado Springs is essentially uninhabited, <br />this study concentrated on the area between Eldorado Springs and the <br />confluence with Boulder Creek. This lower area can be logically divided <br />into four sectors for the purpose of analysis. Between Eldorado Springs <br />and Highway 93, the north side of the creek is relatively flat and with few <br />trees. South of the Creek in this section, the topography is somewhat <br />steeper and characterized by low growing bushes and open areas. There <br />are homes and continued development along the south bank of the Creek. <br />A trailer park is located on the south bank just upstream from Highway 93. <br /> <br />Between Highway 93 and the Denver-Boulder Turnpike, the character <br />of the land is still of a rural-agricultural nature. Northwest of the Creek <br />the topography is flat,while the slopes are steeper on the southeast side. <br /> <br />'I <br />