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. . SUMMARY . . . . This report has identified the probable flooding limits of a IOO-year flood in the Happy Canyon Creek, Badger Gulch, Newlin Gulch, Baldwin Gulch, Sulphur Gulch and Tallman Gulch drainage basins. The flood plain limits are based on planned future development, existing mapped flood plain conditions and no blockage of existing culvert and bridge structures. Even with these assumptions, floods of greater magnitude can and will occur in which the I imits of flooding will exceed those shown in this report. . . In general, there are no serious flooding problems along the streams because existing development is outside of the IOO-year flood plains. Proper management of the flood plains, including additional planning and the adoption and enforcement of flood plain ordinances, will minimize flood damage potential. The possibility of future flood damages has been somewhat reduced in Baldwin Gulch by the construction of a flood water retarding structure in 1965, as part of the "Franktown-Parker Tributaries of Cherry Creek Watershed" and the "West Cherry Creek Watershed" plans, developed by the Soil Conservation Service. . . . . There are twenty-one roadways which cross the flood plains and fourteen of them are overtopped by the IOO-year flood. When flood flows are of sufficient magnitude to dislodge flow obstructions such as trees, brush and other vegetation and carry them downstream, the debris may lodge against bridges or block some culverts. The reduction in flow area can cause severe stage and velocity increases which often are accompanied by structure damage or complete failure. The replacement of crossing structures with adequately sized structures that will pass the IOO-year flood would el iminate much of the potential road crossing damage. . '. . . '. . . 9