Laserfiche WebLink
<br />movement. <br />to man's <br />included: <br /> <br />However, the general pattern of channel adjustments appear related <br />activities rather than natural causes. These activities have <br /> <br />a. A maSS1ve fill encroaching on the east bank of Fountain Creek <br />immediately below and adjacent to the 4th Street bridge, starting about 1962 <br />and continuing to increase to about 1970. <br /> <br />b. The construction of the Highway 50 bypass bridge in the vicinity of <br />13th Street prior to 1962. <br /> <br />c. The massive removal of material adjacent to the low-flow chann..l for <br />construction of the Pueblo Mall in 1976. This project removed essentially all <br />of the low-flow bank material, allowing free migration of the channel frc>m the <br />reach between the Highway 50 bypass bridge and the Highway 47 (College Road) <br />bridge. <br /> <br />d. The enlargement of the flow opening for the Missouri-Pacific <br />Railroad bridge. <br /> <br />e. Channel maintenance activities. <br /> <br />f. <br />located <br />Fountain <br /> <br />The progressive failure of the Booth-Orchard Diversion Structure <br />On the Arkansas River immediately downstream from the mouth of <br />Creek. This failure began in 1976 and has continued to the preElent. <br /> <br />3-22. Based on these developments, an analysis of the natural tendencies of <br />the stream using historical data is impossible. A search for sedimentation <br />publications and data On Fountain Creek by both the Hydrologic Enginl!ering <br />Center and the Albuquerque District, revealed very little in the form of <br />substantial information regarding the Fountain Creek alluvium. General <br />knowledge of this stream from Colorado Springs to Pueblo based On Flood Plain <br />Informat ion, Flood Insurance, and Small Project studies indicates thaI: bank <br />cutting resulting from lateral channel movements has occurred. Again, most of <br />these cases are related to man's activities within the channel, thE! most <br />predominant being channel encroachment. The channel and levee design does not <br />incorporate any major changes to the existing channel that affect its nlLtural <br />conveyance. <br /> <br />3-23. With the failure of Booth-Orchard Diversion nearly complete, nerial <br />photographs for the years 1980 and 1983 show that the channel throughout the <br />project area has developed some very favorable characteristics with reSpl!ct to <br />flood capacity and appears to have established a fairly stable regime. These <br />characteristics include the entrenchment into the alluvium creating an itlcised <br />low-flow channel of uniform width and very constant slope with virtually nO <br />irregularities. Field observations from the site of the Diversion up 1:0 the <br />Missouri-Pacific Railroad bridge indicate that some degree of armoring has <br />taken place. Numerous bridges throughout the reach appear to be contrc1lling <br />lateral migration, thus forcing the creek to maintain a consistent alignment. <br />Degradation, because of the diversion failure, has nearly exposed the Ci.ty of <br />Pueblo main trunk sewer line crossing Fountain Creek approximate ly 300 feet <br />above the mouth. To protect this line, the city is actively engaged in the <br />design and construction of a channel stabilization structure. This structure <br /> <br />III-6 <br /> <br />. <br /> <br />. <br /> <br />. <br />