CEU Cleveland (1991) 



CEU Cleveland ( 1 991 ) provides a history of the basin after the USCG 

 Academy ( 1 974) report up to 1 99 1 . In 1 975, 34 sheet piles 1 7. 1 lineal m 

 (56 lineal ft) were removed from the north breakwater as the test recommended by 

 USCG Academy ( 1 974). The area behind the breakwater filled with sediment to 

 record heights. In 1976, all additional timber piles were removed and a channel 

 dredged. In 1978, a channel was dredged to -2.4 m (-8.0 ft) low water datum 

 (LWD),' and a new floating dock was installed. In 1979, the channel filled in 

 from the north entrance, and a plan was made to close off the northern opening 

 and provide a pump to perform maintenance dredging. In 1980, this plan was 

 abandoned and instead 2,141 cu m (2,800 cu yd) of material was removed. In 

 1981, the basin was abandoned and the USCG vessel was moved to a temporary 

 facility on the Black River. No active basin existed at the site from this time up 

 through the preparation of the CEU Cleveland (1991) report. 



The CEU Cleveland (1991) report was prepared to identify possible solufions 

 to the shoaling problem to allow a basin to be rebuilt at the original location. 

 These options are summarized below. 



a. "Move the station. 



b. Build open moorings and dredge to conform to the natural slope upstream 

 and downstream of the station. 



c. Build open moorings as in b above, plus install a removable floating wave 

 damper (similar recommendation as the USCG Academy (1974) report). 



d. Enclose the moorings with a sheet-pile wall as was done prior to 1 974. 

 Increase the height of the sheet-pile wall to reduce overtopping. Annual 

 dredging would be required to keep the mouth of the basin open. 



e. Enclose the entire mooring on the north and south with sheet-pile wall and 



dredge a new mooring area south of the south sheet-pile wall. 



/ Remove all sheet-pile walls and build a haul-out boat slip. 



' All elevations cited herein are in meters (feet) referred to low water datum (LWD). 

 LWD on Lake Huron is 176 m (577.5 ft) above the International Great Lakes Datum 

 (IGLD)of 1985. 



Chapter 2 Background 



