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WPA                                Date                     Estimated no. 
                                                               cranes

Harvard                         4 March 1977                    450
                                7 March 1977                    500
                               10 March 1977                    300
                               22 March 1977                    450
                               26 March 1977                    600
                               31 March 1977                    350
                                6 April 1977                    450
                               12 April 1977                    100
                               29 March 1978                     75
         
Massie                          7 March 1977                     50
                               22 March 1977                    300
                               26 March 1977                    350
                               31 March 1977                    100
                                6 April 1977                     50

McMurtrey                      22 March 1977                    100
                               26 March 1977                    200
                               31 March 1977                    200
                                6 April 1977                    200
                               12 April 1977                    250

Clark                          22 March 1977                    200

Hansen                         31 March 1977                     50
                                6 April 1977                     35
                                
Prairie Dog                    10 October 1980                   75