Agenda - Parks and Recreation Commission - 09/14/2006

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D. SEGMENT 4 - KINGS ISLAND //'""--:---~ - - \, _;l~ -- j ~\ . 0 1000 / I I Segment 4 is approximately 1.1 miles long. This segment includes 3,100 feet of new trail through Kings Island and 2,400 LF of existing trail through Mississippi River Community Park. Reference Appendix Sheet 6 of 8. 1 . This segment begins at the east end of Rivlyn Avenue and extends to the southeast across Kings Island where it then crosses into the Mississippi River Community Park. Kings Island is within the 100 year flood zone and is surrounded by an old oxbow ofthe Mississippi River. The island is dry most of the year; however there are times that portions will be under water, particularly in the spring of the year. To avoid the trail being constantly flooded, this segment could be raised two to three feet above the existing grade. The ground elevations of the riverbank area on Kings Island are in the range of 837 to 840. Raising the trail above the 100 year flood, would require 7 to 10 feet of fill over much of the approximate 2,800 feet of trail through the island. Approximately 30,000 cubic yards of fill will be necessary to raise the trail, at an estimated cost of $180,000. This would be an added expense and is not necessary due to the alternative high-water route. Raising the trail two to three feet above existing elevations is estimated at $90,000. The fill placement in a flood plain area is generally allowable, but will require permitting review by agencies having interest. There is a parcel of right of way extending from the east end of Rivlyn Avenue toward the southeast. After the trail crosses the oxbow it would be on City of Anoka property or city park property. The first portion of this segment will need to travel down a rather large grade. Significant earthwork will be required in this area to provide acceptable grades on the path itself. There are many Page 1 3 31