Laserfiche WebLink
<br />normal mean temperature is 51.8'F. Extremes of <br />precipitation have varied from a maximum of 29.09 inches in <br />a minimum of 10.91 inches in 1954. The mean maximum and <br />temperatures in July are 85.3'F and 59.0'F, respectively. <br /> <br />annual <br />1938 to <br />minimum <br /> <br />. <br /> <br />, <br /> <br />The City of Longmont is located in northeastern Boulder County, <br />approximately 38 miles north of Denver. Agriculture is the <br />economic base of Longmont, although nearby Denver and Boulder have <br />influenced the growth of new commercial and industrial development. <br />This is reflected in the population trends of Longmont. The <br />population figures for Longmont for 1950, 1960, 1970, 1980, and <br />1990 are 8,099, 11,489, 23,209, 42,942, and 68,154, respectively. <br /> <br />The climate is temperate. Daily average temperatures are 65'F for <br />May to September and 37'F for October to April. The average annual <br />precipitation is 12 inches for the City of Longmont and nearly 17 <br />inches in the mountains of Boulder County, with an average monthly <br />rate of l.5 inches from April to September. <br /> <br />The city lies within the St. Vrain Creek Basin; headwaters extend <br />by way of North and South St. Vrain Creeks into the Rocky Mountains <br />up to the Continental Divide. Elevations range from 4,900 feet in <br />Longmont to over 14,000 feet at Longs Peak. The water of St. Vrain <br />Creek has been appropriated for municipal and irrigation usage. <br /> <br />The topography of St. Vrain Creek, Lefthand Creek, and Dry Creek <br />No. 1 Basins ranges from rugged and heavily forested Rocky Mountain <br />canyons in the west, to slightly rolling prairie land near <br />Longmont, where pasture land and cropland border streambanks lined <br />with brush, willow, and cottonwood trees. Spring Gulch has a basin <br />that extends to Terry Lake, but it has a channel only from 15th <br />Avenue to St. Vrain Creek in Longmont. Loomiller Basin lies <br />entirely within Longmont. <br /> <br />Dry Creek No.1, Spring Gulch, and Lefthand Creek originate outside <br />the PMA of Longmont in the Rocky Mountain foothills and follow <br />generally easterly courses through the city. Spring Gulch consists <br />of an improved channel that starts south of East 15th Avenue and <br />continues as a concrete-lined channel through Spring Gulch Linear <br />Park to 3rd Avenue, then down to St. Vrain Creek. Loomiller Basin <br />is a depression oriented in a northwest-southeast direction through <br />central Longmont. Floodwater accumulates in the depression and <br />subsequently drains into Spring Gulch Basin near 3rd Avenue and <br />Atwood Street. A large portion of the area within the PMA of <br />Longmont limits and adjoining the streams is fully developed. <br /> <br />~ <br /> <br />Commercial and residential development exist in the floodplains of <br />all the streams studied. On St. Vrain Creek, from Airport Road to <br />the confluence with Dry Creek No.1, industrial and commercial <br />buildings, farms, and mobile home parks share the floodplain wi th <br />gravel-mining sites. The Dry Creek No. 1 floodplain is occupied by <br />both commercial building and single-family dwellings from Sunset <br />Street to the confluence with St. Vrain Creek. Development along <br />Spring Gulch is also represented by pastureland and a linear park <br /> <br />11 <br />