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<br /> <br />V II 1-8 <br /> <br />Sand Creek to Brighton <br />tletween Sand Creek and Brantner the erOSlon of the South Platte River bed <br />has resulted in a lowering of the bed by approximately 2 to 4 feet. <br /> <br />(L.. .'LT <br /> <br />-< <br /> <br />The drop at 88th Avenue bridge has caused aggradation at the bridge of about <br />3 to 4 feet, but downstream of 88th Avenue to the Fulton Dam, there has been <br />practically no change in the bed elevation. The City of Thornton water <br />supply gravel pits are in a reach of the South Platte River where the river <br />bed elevation is virtually the same in 1983 as it was in 1963. Bed erosion <br />would have endangered the steep banks at the Thornton site. <br /> <br />'00 <br /> <br />.. <br /> <br />. <br />w <br />z .. <br />. <br />~ <br />z <br />w <br />u e <br />. <br />w <br />. <br /> <br />.. <br /> <br />Between the Fulton Dam and the Brantner Dam the bed of the South Platte <br />River has generally eroded. The maximum erosion has occurred immediately <br />downstream of the Fulton Dam where the erosion reaches 4 feet. The 1 1/2 <br />mile reach upstream of the Brantner Dam has been an area of aggradat ion. <br />Downstream of the Brantner Dam to Henderson Island the river bed elevation <br />has not significantly changed between 1963 and 1983. <br /> <br />. <br />.... <br /> <br />." <br /> <br />'00 <br /> <br /> <br />.. <br /> <br />CHERRY CREEK <br /> <br />. <br />w <br />z <br />~ <br />~ .. <br />z <br />w <br />u <br />. <br />w <br />. .. <br /> <br />From Henderson Island to Baseline Road, the South Platte River has eroded by <br />about 2 feet on the average, with a maximum of 4 feet at Brighton. <br /> <br />.. <br /> <br />Generally, the erosion of the South Platte River has been accompanied by <br />serious river bank erosion problems between Sand Creek and Brighton. <br /> <br />. <br />0.00. <br /> <br />0.01 <br /> <br />". <br /> <br />Chatfield Reservoir to Brighton <br />Between 1963 and 1983 the South Platte River has eroded its bed downward a <br />maximum of 6 feet while aggrading in some other places. Several other areas <br />have been downcut 4 feet. In nearly the whole 40 mile reach of the river, <br />degradation has occurred which overall is estimated at an average of 2 feet. <br />Aggradation has been experienced upstream from new or raised drop structures <br />in the 1963 to 1983 period. The downcutting has been associated with river <br />bank caving and erosion. Resulting damages tend to fall on the public agen- <br />cies, including Add"''' County, State Highway Department, sanitation dis- <br />tricts, and Littleton. <br /> <br />O' I. <br /> <br />>>. <br /> <br />'" <br /> <br />aRAI.. IIZE <br /> <br /> <br />01 1,0 <br />GRAIN SlIt: <br /> <br />... <br /> <br />O~ <br /> <br /> <br /> BEAR CREEK FIGURE VIII-I <br /> .. <br />. <br />w <br />z <br />. .. <br />~ BED MATERIAL <br />z 12 <br />w <br />u <br />. .. SIZES <br />w <br />. <br /> .. <br /> .I -1 Iv I <br /> OOOt ... ... 00 >>. ,.. <br /> G"AI" SIZE <br />