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TO: The Honorable Members of DATE: October 15, 1984 FILE: the Board of County Commissioners THROUGH: Michael Wright, County Administrator FROM: James W. Davis, P. Public Works Directol DESCRIPTION AND CONDITIONS SUBJECT: Bridging of 14th Street Canal East of Rockridge, South of Fairlane Harbor REFERENCES: Kimley Horn and Associates, Engineers for the Southerly Extension of Indian River Boulevard, and County.staff met on October 8, 1984 with the property owners who own lots along the Rockridge canal. Many of these owners have small boats and use the 14th Street canal for ingress/egress to the Indian River. The purpose of the meeting was to inform the boat owners that the bridge proposed for construction at Indian River Boulevard would provide approximately 9.2 ft. of vertical clearance at Mean High Water and approximately 9.96 feet of vertical clearance at Mean Low water. Once this vertical clearance is established, the Engineers can apply for a Coast Guard Permit. The owners of approximately 13 lots were represented. ALTERNATIVES AND ANALYSIS Two property owners expressed that a 10' vertical clearance at High Water is required for their boats to use the waterway. This condition is required due to less than a 1 foot water depth in the channel at low water and the fact that 2 boats using the channel have a.vertical height of approximately 10 -feet. The consultants have indicated that for every 1 foot increase in height, the.cost of the approach fill and bridge cost would increase approximately $35,000 to $40,000. Also, as the height increases it may be necessary to require the removal or relocation of mobile homes encroaching in the County right-of-way at Fairlane Harbor Mobile Home Park. It was also mentioned that use of the waterway is restricted by the shallow depth of water and the residents request that the channel be dredged. Drainage in the Rockridge area would improve if the channel is dredged. The City and County have designed and obtained permits to dredge the channel and are planning the work. RECOMMENDATION It is recommended that the County instruct the consulting Engineers to include dredging of the channel as a part of the Indian River Boulevard Project and that the Bridge be designed to provide the 9.2 feet to 9.96 feet of vertical clearance as proposed. The dredging of the channel would allow the boats to use the bridge at low tide and the approximately 10 feet of vertical clearance would be available. 33 BOOK 58 PAGE 735 OCT 24 1984