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<br />Drainage basins are identified by a 9- or 10-digit code number* <br />composed of five designators as shown below: <br /> <br />. <br /> <br />A B <br /> <br />C D <br /> <br />E <br /> <br />0- OOc 00 00- 00 <br /> <br />Column A - Designation of the Irrigation Water Division <br />established for the administration of water within the State of <br />Colorado: <br /> <br />1 - Sout.h Platte River <br />2 -'Arkansas River <br />3 - Rio Grande River <br />4 - Gunnison River <br /> <br />5 - Colorado River (exc. the Gunnison) <br />6 - Mlite, Yampa, Green & North <br />Platte River <br />7 - Southwest Colorado including the <br />San Juan River <br /> <br />Column B - A two- or three-digit number, based on a federal number- <br />ing system, representing the county in which the lower point of the <br />basin (point of interest) is located: <br /> <br />01 - Adams <br />05 - Arapahoe <br />13 - Boulder <br />31 - Denver <br /> <br />35 - Douglas <br />59 - Jefferson <br />123 - Weld* <br /> <br />Column C - The two digits in Column C identify the major tributary, <br />or direct flow drainage basin to the main river. The prefix 00 indi- <br />cates t.hat the basin is an area draining directly into the South Platte <br />Ri ver. <br /> <br />. <br /> <br />Column D - A two-digit number further defining the major tributary <br />basin by showing tributaries and subtributaries to the main drainage <br />channel, starting with 01 at the lowest end of each basin and number- <br />ing consecutively upstream and along tributaries to tributaries. For <br />South Platte River direct flow areas (00 prefix), it indicates the <br />consecutive number of the major drainage area upstream from the UDFCD <br />boundary along the river. <br /> <br /> Direct. Flow Areas <br />0051 East Bank 0057 West Bank 0064 West Bank <br />0052 West Bank 0058 East Bank 0065 West Bank <br />0053 East Bank 0059 West Bank 0066 East Bank <br />0054 West Bank 0060 East Bank 0067 West Bank <br />0055 East Bank 0061 West Bank 0068 East Bank <br />0056 West Bank 0062 East Bank 0069 East Bank <br /> 0063 East Bank 0070 West Bank <br /> <br />. <br /> <br />*Weld County requires three digits to identify the county. <br /> <br />4 <br />