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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />The upper portion of Boulder Creek supports a very respectable fish <br /> <br />population in the spring. As the stream meanders through the metro- <br /> <br />pol itant Boulder area, flood plain use becomes more intense and the <br /> <br />result is a decreasing fish population. Eventually, severe dewatering <br /> <br />and complete streambed channel ization cause the trout population to be <br /> <br />completely eliminated. At this point (below Broadway) the streambed <br />bears no resemblance to a natural channel. Upon reaching the downstream <br /> <br />Arapahoe Road bridge, man's disturbance lessens and the creek recovers <br /> <br />sl ightly to support a very small population of rainbow trout. In the <br />past few years, instream improvements have been installed in this area <br /> <br />to make it more suitable for trout. <br /> <br />28th Street, Eastpark II I residential development downstream and north <br />of the intersection of Arapahoe Road and 47th Street Parkway, Crossroads <br /> <br />Shopp i ng Center. <br /> <br />STUDY DATA <br />1. The following information was received from the United States Army <br />Corps of Engineers for use in preparing this report: <br /> <br /> <br />a. Hydrology <br /> <br /> <br />1) Draft Report, Metropolitan Denver and South Platte River <br /> <br /> <br />and Tributaries Study, Volume V, Appendix H, Hydrology. <br /> <br /> <br />2) Hydrology profiles through Boulder Creek. <br /> <br />RARE AND ENDANGERED SPECIES <br />State and Federal listings were examined for the status of rare or <br />endangered species. No rare or endangered plant or animal species are <br /> <br />known to occur in the Boulder Creek floodplain in the study area. <br /> <br />b. Hydraul i cs <br />1) Cross-sections of existing channel with 100-year ex- <br />cavated floodway cross sections superimposed. <br /> <br /> <br />2) Water surface profiles for 5, 10, 25, 50, 100 and 500- <br /> <br /> <br />year Frequency Floods for existing conditions; including <br /> <br /> <br />sl ight modifications downstream of 30th Street made in <br /> <br /> <br />November 1977. <br /> <br /> <br />3) Water surface profile for 100-year flood with bridges <br /> <br /> <br />partially blocked. <br /> <br /> <br />4) Water surface profile for 100-year flood with bridges <br /> <br /> <br />removed. <br /> <br />5) HEC-2 computer card deck for existing conditions. <br />6) HEC-2 computer card deck and print-out from preliminary <br />design of 100-year excavated floodway. <br /> <br />The most abundant size of rainbow trout during the spring is six to <br /> <br />seven inches long; while eight to nine-inch fish are the most common <br /> <br />during the late summer. The size increase during the summer indicates <br /> <br />good growth for rainbow trout in Boulder Creek. Observance of numerous <br /> <br />male and female trout in a reproductive condition and presence of a <br /> <br />substantial number of young of-the-year fish (two to four inches) <br />strongly suggests that Boulder Creek supports natural reproduction. <br /> <br />STATEMENT ON RECENT DEVELOPMENTS NOT INCLUDED IN PHASE B MASTER PLAN <br />The following features were not included in this Study; 47th S.treet <br />Parkway, Sherrelwood residential development immediately downstream of <br /> <br />1 9 <br />