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located along t11e Sout11 Platte River, the Cache la Poudre River and C1lerry Creek, as shown in <br />Table 1. <br />Table 1 -Reaches Included in Gain/Loss Evaluation <br />Reach Name U stream Ga e Name Downstream Ga e Name <br /> SOUTH PLATTE P~IVER AT <br />South Platte 1 -Waterton to WATERTON (670800) and PLUM SOUTH PLATTE RIVER AT <br />Denveri CREEK NEAR LOWIERS (6709500) DENVER (671000) <br />South Platte 2 -Denver to SOUTH PLATTE RIVER AT SOUTH PLATTE RIVER AT <br />Henderson DENVER (671000) HENDERSON (6720500) <br />South Platte 3 -Henderson SOUTH PLATTE RIVER AT SOUTH PLATTE RIVER AT FORT <br />to Fort Lupton HENDERSON (6720500) LUPTON (6721000) <br />South Platte ~ -Fort Lupton SOUTH PLATTE RIVER AT FORT SOUTH PLATTE RIVER NEAR <br />to Kerse LUPTON (6721000) KERSEY (675000) <br />South Platte 5 -Kersey to SOUTH PLATTE RIVER NEAR SOUTH PLATTE RIVER NEAR <br />Weldona KERSEY (675-I000) WELDONA (6758500) <br /> SOUTH PLATTE RIVER AT <br /> COOPER BRIDGE NEAR BALZAC <br />South Platte 6 -Weldona to SOUTH PLATTE RIVER NEAR AND SOUTH PLATTE RIVER AT <br />B~~izac WELDONA (6758500) BALZAC,CO (6759910) <br /> SOUTH PLATTE RIVER AT <br /> COOPER BRIDGE NEAR BALZAC SOUTH PLATTE P~IVER AT <br />South Platte 7 - Balzac to AND SOUTH PLATTE RIVER AT JULESBURG (COMBINED) <br />Juleshnrg BALZac,co (6~59910> (6~6~000) <br /> CACHE LA POUDRE AT CANYON <br />Cache la Poudre - Ft MOUTH NEAR FORT COLLINS CACHE LA POUDRE NEAR <br />Collins to Greele (6752000) GREELEY (6752500) <br />Cherry Creek - Franktown CHERRY CREEK NEAR CHERRY CREEK AT DENVER, CO <br />to Denver FRANKTOWN, CO (6712000) (6713500) <br />i Flow at this upsh~eam boundary was defined by gaged flow h~om both the South Platte River at Waterton gage and <br />the Plum Creek near Louviers gage <br />Segment Boundary was defined by two separate combined gages because daily streamtlow records for South Platte <br />at Balzac were av~ulable h~om 1950 tlu~ough 1980 and South Platte at Cooper Bridge daily strearnflow records were <br />available after 1980. <br />These reaches were selected because the streaniflow gages t11at define the reaches had the daily <br />flow data for t11e study period that was needed for t11e analysis. The stream reaches and gages <br />used are displayed in Figure 1. <br />1.2 Data collection <br />A spreadsheet-based approach was used to estimate monthly baseflow values for each reach <br />evaluated for t11e study period, which extends from 1950 to 2005. In order to estimate the <br />monthly baseflow values, daily baseflow values were calculated for the study period. To <br />develop the daily baseflow estimates all significant measured and quantifiable daily surface <br />water uzflows and outflows within a river reach were collected. These flows were summed to <br />SPDSS Phase 4 Task 46 Technical Memorandum -Final <br />0~4i 10108 <br />