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Last modified
11/23/2009 12:40:37 PM
Creation date
5/18/2007 9:17:18 AM
Metadata
Fields
Template:
Floodplain Documents
Designation Number
594
County
Jefferson
Community
Jefferson County and Incorporated Areas
Title
FIS - Jefferson County and Incorporated Areas - Vol 1
Date
6/17/2003
Prepared For
Jefferson County
Prepared By
FEMA
Floodplain - Doc Type
Current FEMA Regulatory Floodplain Information
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<br />East of the foothills, the climate is continental. The general features are low relative <br />humidity; an extensive amount of sunshine; light rainfall, confined largely to the warmer half <br />of the year; moderately high wind movement; a large daily range in temperature; high day <br />temperature in summer; and generally, in the winter, a few protracted cold spells. <br /> <br />The climate is characterized by cold winters and warm summers. Mean monthly temperatures <br />range from approximately 30 degrees Fahrenheit e'F) in January to approximately 750P in <br />July, with an average annual temperature of approximately 50OP. Recorded temperature <br />extremes are a high of l020P to a low of -26OP. The average annual precipitation is 14.95 <br />inches, falling mainly from April to August (Reference 27). The heaviest recorded general <br />rainfalls have come in late May and early June, when the temperature contrast between warm <br />sutface air and cool upper air is greatest. The Front Range foothills of the Rocky Mountains <br />area are also subject to a meteorological phenomenon known as cloudbursts. They are <br />confined chiefly to the eastern foothills regions below an elevation of 7,500 feet and extend <br />eastward toward the plains for approximately 50 miles. Cloudbursts develop when there is a <br />marked temperature range within a relatively small area and occur in the afternoon or early <br />evening of an unusually warm day. Cloudbursts are characterized by intense rainfall of short <br />duration that is confined to a very small area. These storms have rarely occurred where <br />precipitation could be measured at a weather station (Reference 28). In the area, the peak <br />discharge from a cloudburst is greater than that caused by rainfall during a period of <br />snowmelt <br /> <br />The City of Golden, which is the county seat, was founded in 1859 and was frrst called <br />Golden City. Golden was the capital of the Jefferson Territory from 1862 to 1867. <br /> <br />Golden is located in northern Jefferson County, approximately 8 miles west of Denver and <br />18 miles south of Boulder. The city lies at the base of the Front Range foothills of the Rocky <br />Mountains. Golden encompasses an area of 741 square miles and had an estimated population <br />of 15,259 in 1998 (Reference 26). <br /> <br />The stream network in Golden is composed of Clear Creek, which flows from west to east, <br />and its tributaries. Tucker Gulch is a left-bank tributary, providing drainage for areas north of <br />Clear Creek. Kenneys Run and Lena Gulch are right-bank tributaries, providing drainage <br />from areas south of Clear Creek. The confluences of Tucker Gulch and Kenneys Run with <br />Clear Creek occur within the City of Golden. The confluence of Lena Gulch with Clear <br />Creek occurs downstream of the city. <br /> <br />Clear Creek has its source in the Rocky Mountains at the Continental Divide. After flowing <br />easterly through the mountains, Clear Creek enters the high plains at Golden and flows <br />northeasterly to Commerce City, where it joins the South Platte River. The 400-square-mile <br />drainage area of Clear Creek above Golden is characterized by steep slopes, rugged terrain, <br />and forests. Within Golden, the Clear Creek floodplain contains heavily developed areas as <br />well as parks and campgrounds4 <br /> <br />Tucker Gulch begins in the foothills northwest of Golden and winds its way through Golden <br />Gate Canyon before flowing into Clear Creek in Golden. Tucker Gulch drains an area of <br />11.22 square miles above Clear Creek. Cressmalls Gulch is a left-bank tributary to Tucker <br /> <br />10 <br />
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