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000911 ~. 3.12 issue. In the end, a graduated assessment based on the elements of benefit and safety was apparently adopted. It was reported in the Ouray Herald that this assessment ranged anywhere from seven to 70 dollars per lot, depending on its proximity to the flume. These assessments would be used to payoff ten- year bonds at an interest rate of six percent per annum issued by Henry Wilcox and Son. On October 13, 1909, a contract was awarded to Thomas Phillips & Company to build the flumes at a cost of $12,000 for Portland Creek and $10,000 for Cascade Creek. Actual construction was scheduled to start as soon as equip- ment could be brought into town. The completion date was set for December 31, 1909. Over the years, minor repairs and modifications to the flumes have taken place. For example, the Cascade Creek flume below Third Street was originally flat bottomed all the way to the Uncompahgre River. The shape was later changed to a WV. by adding a concrete wedge on each side. Although this reduces the cross-sectional area, the improved shape helps to keep the flumes clean. 3.3.2 Flume Dimensions ". Typical cross sections of the flumes are provided in Figure 3.3 and Figure 3.4. The Portland flume is larger with a typical width of ten feet, has four foot vertical side walls, and a V-bottom depressed approximately one foot. The Cascade flume is typically seven feet wide, has three-foot vertical walls and a V-bottom depressed less than one foot. Downstream of station 3+64 (station 0+00 being the downstream end of the flume), the Cascade flume tran- sitions to a wider cross section with a deeper V-bottom, but the side walls are reduced in height. Each flume has a reinforced concrete box culvert under colorado State Highway 550. The box on Portland Creek is 6 feet by 10 feet and the box on Cascade Creek is 4 feet by 7 feet. Profiles of the flume inverts on Portland and Cascade Creeks are provided in Figures 3.5 and 3.6, respectively. These profiles were surveyed during the field trip on August 30 and 31, 1982. The survey on Portland Creek extended from the downstream end of the flume, at the Uncompahgre River, upstream to several hundred feet above the flume's entrance. Because of time constraints, the survey on Cascade Creek did not cover the entire flume length. Its survey extended fro~ the Uncompahgre River to a point 1,100 feet upstream. Estimated ,. ! ! . . , D 4.d ~ T , 4.1' i b .- 0- I I I 4.0' I i -L 0.9' 1