![]() Under the Köppen climate classification, the city is considered semi-arid (Köppen BSk) or humid subtropical (Köppen Cfa) as it falls near that precipitation boundary, due to its relatively high yearly precipitation and average temperatures remaining above 32 ☏ (0 ☌) year-round. Snowfall is common in Boulder throughout the winter.īoulder has a temperate climate typical for much of the state and receives many sunny or mostly sunny days each year. The plan aims to maintain or enhance native plant and animal species, their communities, and the ecological processes that sustain them and to reduce the wildfire risk to forest and human communities. The city's Open Space and Mountain Parks department manages approximately 8,000 acres of protected forest land west of the city in accordance with a 1999 Forest Ecosystem Management Plan. In 2010, goats were used to keep weeds under control at the Boulder Reservoir. Goats naturally consume diffuse knapweed and Canada thistle, and although the program was not as effective as it was hoped, goats will still be considered in the future weed control projects. Īlso in 2005, the city experimented with using goats for weed control in environmentally sensitive areas. Under Boulder law, extermination of prairie dogs requires a permit. Residents can opt-out of the program by contacting the city and asking that their areas not be sprayed. However, with the threat of West Nile virus, the city began an integrative plan to control the mosquito population in 2003 that includes chemical pesticides. Traditionally, Boulder has avoided the use of chemical pesticides for controlling the insect population. From time to time, parks and hiking trails are closed to conserve or restore ecosystems. Also, the city's Parks and Recreation and Open Space and Mountain Parks departments have volunteers who monitor parks (including wetlands, lakes, etc.) to protect ecosystems. Wildlife protection īoulder has created an Urban Wildlife Management Plan which sets policies for managing and protecting urban wildlife. Įffective growth management has resulted in a rapid increase in housing costs with the median home price rising 60% over the period 2010 to 2015 to $648,200. A Historic-Preservation Code was passed in 1974, and a residential-growth management ordinance (the Danish Plan) in 1976. ![]() Hoping to preserve residents' views of the mountains, in 1972, the city enacted an ordinance limiting the height of newly constructed buildings. In 1970, Boulder created a "comprehensive plan" that would dictate future zoning, transportation, and urban planning decisions. In 1967, city voters approved a dedicated sales tax for the acquisition of open space in an effort to contain urban sprawl. In 1959, city voters approved the "Blue Line" city-charter amendment which restricted city water service to altitudes below 5,750 feet (1,750 m), in an effort to protect the mountain backdrop from development. Since then, Boulder has adopted a policy of controlled urban expansion. Government preservation of open space around Boulder began with the Congress of the United States approving the allocation of 1,800 acres (7.3 km 2) of mountain backdrop/watershed extending from South Boulder Creek to Sunshine Canyon in 1899. ĭenver International Airport is located 45 miles (72 km) southeast of Boulder. Arapahoe Glacier provides water for the city, along with Boulder Creek, which flows through the center of the city. The 40th parallel (40 degrees north latitude) runs through Boulder and can be easily recognized as Baseline Road today.īoulder lies in a wide basin beneath Flagstaff Mountain just a few miles east of the continental divide and about 25 miles (40 km) northwest of Denver. ![]() The creek is a tributary of the South Platte River.Īt the 2020 United States Census, the city had a total area of 17,514 acres (70.877 km 2) including 664 acres (2.689 km 2) of water. Boulder Creek has significant water flow, derived primarily from snow melt and minor springs west of the city. It is from Boulder Creek that Boulder city is believed to have taken its name. The creek was named prior to the city's founding, for all of the large granite boulders that have cascaded into the creek over the eons. īoulder Creek is the primary flow of water through Boulder. The Flatirons are a widely recognized symbol of Boulder. The Flatirons, slabs of sedimentary stone tilted up on the foothills, are located west of the city. ![]() The city of Boulder is located in the Boulder Valley, where the Rocky Mountains meet the Great Plains.
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