FLOOD06991 - Laserfiche WebLink

Home Browse Search

channel near Hi Country condominium developments and to protect the channel bank at the Winter Haven Lodge and vasquez Road crossing on Vasquez Creek. One wooden bridge on the Fraser River near Maryvale was destroyed. Photographs of the areas mentioned are shown in Figures 2 through 9. The 1983 peak flow of 618 cubic feet per second (cfsl recorded at U.S. G~ological Survey gage No. 09024000 on the Fraser River was approximately a 50-year flood. Historically, the annual flows have generally been confined within the channel with minor exceptio~s in the Beaver and Maryvale areas on the Fraser River. Blockage of culverts or bridges'due to the debris has not been a problem identified by Winter park, nor has jamming due to ice been a problem in the past. The areas which currently are most constric- tive have been identified by the town as the Ski Idlewild culverts crossing the Fraser River, and the culvert at the Arapahoe Road crossing of Vasquez Creek. The-town has replaced the Arapahoe Road culvert with a properly sized culvert. This new culvert was included in the analysis for this study. The Ski Idlewild Road is privately owned and the town has no jurisdiction over it. Several minor structures built across the Fraser River, such as footbridges and temporary bridges, were washed out during the 1983 flooding and have not been rebuilt. Such structures repr_!i\,se~!: the potential for bloCking downstream culverts or bridges, which may aggrav~te flooding problems. The highest flow of record on Ftaser River was 820 cfs for June 13, 1918, recorded at U.S. Geological Survey gage No. 09024000, which was greater than a SOO-year event. 2.4 Flood protection Measures Winter Park restricts building within 30 feet of the Average High- Water line. The determination o;>f this line is made by the U.S. Army Corps of Engineers on a site-specific basis. There are no structures in the fraser River basin specifically designed for flood protection. 'There are, however, several diver- sion structures and railroad and road embankments that affect flooding. Water is diverted from the Fraser River, Jim Creek, Vasquez Creek, and Little Vasquez Creek by the Denver Water BOard. These diversions have been in operation since the 1930s. Total capacity of the diversion system is 750 cfs. Base flows for fish population main- tenance - are 10 cfs for the Fraser River and 8 cfsfor Vasquez Creek (Reference 1). The effects of the diversions have not been included in the hydraulic analysis: for t~is study. 6