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0 • <br />Morrison Creek Diversion Status Summary <br />1. Diversion at Silver Creek/Monison Creek Confluence <br />• This site has excellent access. <br />• For 2003, the peak flow below the confluence was 826 cfs (6/1/03). Flow averaged <br />approximately 300 cfs from April 28s' through June 12t'. <br />• We have considerable concern about the amount of sediment transported in Morrison <br />Creek from Muddy Creek. This sediment will end up in Stagecoach. <br />• A mile long pipeline is required from the divers_ ion structure below the confluence to <br />-the upper Little Morrison Creek drainage. 500 feet of the pipeline would be buried at <br />.approximately 50 feet deep. <br />• Two options considered:.. , <br />o Open trenching: cost estimated at $2,200,470 <br />o Boring: cost estimated at $4,572,350 <br />• The highest average monthly stream flow for Little Morrison Creek occurs in April <br />and measures approximately .7 ch. Normal flow in Little Morrison Creek would <br />quadruple With the diverted water. There is significant concern about the probable <br />deterioration of the existing natural Little Morrison Creek channel due to the diverted <br />water. <br />• An alternative would be to continue the pipe down county road 16 to Stagecoach <br />thereby preserving the Little Morrison Creek charnel. Morro recommends this <br />alternative. <br />2. Diversion up Silver Creek <br />• The proposed diversion site is located on National Forest property and borders the <br />Sarvice Creek Wilderness Area. <br />• Access to the site would be very difficult requiring a bridge and steep road <br />constructed over a mountain. <br />• The Silver Creek water runs extremely clear and thus does not have the potential <br />sedimentation problem of Morrison Creek. <br />• This option would require a 2000 foot bore through the mountain. <br />• As a result of the higher diversion elevation, the pipeline (with the exception of the <br />bore) would be -at standard depth. <br />• This concept has the same potential negative impact on the Little Morrison Creek <br />drainage as the concept abave. <br />• No cost-estimate was developed for this concept. <br />3. Diversion at Morrison Creek Bridge Crossing on County Road 16 <br />• This diversion point is above the confluence of Silver Creek and Morrison Creek. <br />Therefore, this option does not get the benefit of the Silver Creek water. <br />• This site has excellent - access. <br />• We have considerable concern about the amount of sediment transported in Morrison <br />Creek from Muddy Creek. This sediment will end up in Stagecoach. <br />Appendix D <br />