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"Major Drainageway Planning Study for Lower RalstonNan Bibber and Leyden Creeks" (Reference 37). These future measures consist of additional channelization and the use of detention ponds. In Arvada, a number of reservoirs exist on the study streams which provide incidental flood protection, even though they were not specifically designed as flood control structures. Arvada Reservoir, which is owned and maintained by the City of Arvada, and Ralston Reservoir, which is owned and maintained by the Denver Water Board, are located on Ralston Creek. Lake Arbor, which is located on Tributary C of Little Dry Creek, and the Pomona Lakes, which are located on Little Dry Creek, are designated as recreation facilities that are owned and operated by the City of Arvada. Leyden Lake, located on Leyden Creek, is currently a water storage facility owned and operated by the Farmers High Line Canal Company. The above-mentioned reservoirs, with the exception of Leyden Lake and Arvada Reservoir, are expected to attentuate the IOO-year frequency event. In addition, the City of Arvada has provided assurances to FEMA that these reservoirs, with the exception of Leyden Lake, would continue to be maintained and operated. The City of Edgewater, in conjunction with the City of Lakewood and City and County of Denver, permitted the UDFCD to plan and implement channel and culvert improvements in 1977 ~ The UDFCD constructed the West 18th A venue extension channel from Depew Street to Sheridan Boulevard~ To improve the efficiency of bridge culverts at Depew Street and Sheridan Boulevard, the UDFCD installed twin 12- by 5-feet culverts at Depew Street and four 7- by 5-feet precast-concrete boxes at Sheridan Boulevard. All construction was completed by early 1983~ The installed culverts relieve bottleneck conditions caused by inundation. In 1987, channel improvements between Ingalls Street and 20th Avenue to Depew Street were completed. A detention pond outside the corporate limits at 25th Avenue and Wadsworth Street reduces sheetflow east of Pierce Street. No flood protection measures are provided upstream of Golden on any of the streams. Within the city, channelization measures have been taken in some areas; primarily, these measures are concrete walls to streamline the flow. Tucker Gulch has been sufficiently channelized from State Highway 58 to its confluence with Clear Creek to pass the lOO-year tlood~ The existing channelization of sections of Clear Creek is not sufficient to protect the city from I DO-year floods and floods of higher recurrence intervals. Clear Creek is channelized from Washington A venue downstream. The city has enacted an ordinance to minimize property damage and danger to life in floodplain areas (Reference 38). Provisions in the ordinance regulate and restrict the following: land use and development patterns; construction practices and flood proofing measures; presence of potentially hazardous debris and pollutants; design and construction of water-supply systems, waste-water systems, and other public works; and design and construction of drainage systems subjecting other property to floodwater damage. No flood protection measures have been provided immediately upstream of the Town of Morrison~ Streams within Morrison have been channelized. Brick walls serving to streamline the flow comprise most of the channelization measures. However, most of the beneficial effects of the walls are nullified due to the adjacent growth of vegetation. These walls were built many years ago and have had little maintenance since that time~ 23